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2002All rights reserved. This book may not bereproduced or copied, in whole or in part, withoutthe written permission of Toyota MotorCorporation.
2003 TOYOTA TUNDRA (EWD491U)
1
2003 TOYOTA TUNDRAELECTRICAL WIRING DIAGRAM
Section Code Page
INTRODUCTION A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
HOW TO USE THIS MANUAL B. . . . . . . . . . . . . . . . . . 3
TROUBLESHOOTING C. . . . . . . . . . . . . . . . . . . . . . . . . 12
ABBREVIATIONS D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
GLOSSARY OF TERMS AND SYMBOLS E. . . . . . . . 18
RELAY LOCATIONS F. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
ELECTRICAL WIRING ROUTING G. . . . . . . . . . . . . . . 30
SYSTEM CIRCUITS H. . . . . . . . . . . . . . . . . . . . . . . . . . . 55
GROUND POINT I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
POWER SOURCE (Current Flow Chart) J. . . . . . . . . 250
CONNECTOR LIST K. . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
PART NUMBER OF CONNECTORS L. . . . . . . . . . . . . 266
OVERALL ELECTRICAL WIRING DIAGRAM M. . . . . 270
2003 TOYOTA TUNDRA (EWD491U)
3
HOW TO USE THIS MANUAL B
This manual provides information on the electrical circuits installed on vehicles bydividing them into a circuit for each system.
The actual wiring of each system circuit is shown from the point where the powersource is received from the battery as far as each ground point. (All circuitdiagrams are shown with the switches in the OFF position.)
When troubleshooting any problem, first understand the operation of the circuitwhere the problem was detected (see System Circuit section), the power sourcesupplying power to that circuit (see Power Source section), and the ground points(see Ground Point section). See the System Outline to understand the circuitoperation.
When the circuit operation is understood, begin troubleshooting of the problemcircuit to isolate the cause. Use Relay Location and Electrical Wiring Routingsections to find each part, junction block and wiring harness connectors, wiringharness and wiring harness connectors, splice points, and ground points of eachsystem circuit. Internal wiring for each junction block is also provided for betterunderstanding of connection within a junction block.Wiring related to each system is indicated in each system circuit by arrows(from__, to__). When overall connections are required, see the Overall ElectricalWiring Diagram at the end of this manual.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@
ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ
W–R
7. 5AGAUGE
1
2
3
4
487
2 1 11
13
4
1
2
3
4
1
2
B18
BL
FROM POWER SOURCE SYSTEM (SEE PAGE 66)
R–L
R–L
G
W–B
W–B
W–B
W–B
W–B
W–B
Y–G
R
L 4
H17
R 6
DELAYCIRCUIT
S 6
B18
3
4
R 7
BV11
G–W
G–R
G–R
G–R
G–R
G–W
G–W
(W/G
)
(S/D
)(S
/D)
C 7
(SHIELDED)
BV11
I 5
LL
STOP LIGHT
15
7
TO ABS ECU
BO
50
15ASTOP
IB
IB
REAR LIGHTSWARNING LIGHT[COMB. METER]
3C
3C
IE114
STOP LIGHT SW
ST
OP
LIG
HT
RH
[RE
AR
CO
MB
. LI
GH
T R
H]
ST
OP
LIG
HT
RH
[RE
AR
CO
MB
. LI
GH
T L
H]
HIGH MOUNTEDSTOP LIGHT
[A]
[B]
[I]
[D]
[F]
[H]
[E]
[J]
[M]
[N]
[K]
[L]
[G]
[C]
LIGHT FAILURE SENSOR
2003 TOYOTA TUNDRA (EWD491U)
4
B HOW TO USE THIS MANUAL
∗ The system shown here is an EXAMPLE ONLY. It is different to the actualcircuit shown in the SYSTEM CIRCUITS SECTION.
2003 TOYOTA TUNDRA (EWD491U)
5
B
[A] : System Title
[B] : Indicates a Relay Block. No shading is used andonly the Relay Block No. is shown to distinguish itfrom the J/BExample: Indicates Relay Block No.1
[C] : ( ) is used to indicate different wiring andconnector, etc. when the vehicle model, enginetype, or specification is different.
[D] : Indicates related system.
[E] : Indicates the wiring harness and wiring harnessconnector. The wiring harness with male terminal isshown with arrows ( ).Outside numerals are pin numbers.
Female Male ( )
The first letter of the code for each wiring harnessand wiring harness connector(s) indicates thecomponent’s location, e.g, ”E” for the EngineCompartment, ”I” for the Instrument Panel andSurrounding area, and ”B” for the Body andSurrounding area.
When more than one code has the first and secondletters in common, followed by numbers (e.g, IH1,IH2), this indicates the same type of wiring harnessand wiring harness connector.
[F] : Represents a part (all parts are shown in sky blue).The code is the same as the code used in partsposition.
[G] : Junction Block (The number in the circle is the J/BNo. and the connector code is shown beside it).Junction Blocks are shaded to clearly separatethem from other parts.
3C indicatesthat it is insideJunction BlockNo.3
Example:
[H] : When 2 parts both use one connector in common,the parts connector name used in the wire routingsection is shown in square brackets [ ].
[I] : Indicates the wiring color.
Wire colors are indicated by an alphabetical code.
B = Black W = White BR = Brown
L = Blue V = Violet SB = Sky Blue
R = Red G = Green LG = Light Green
P = Pink Y = Yellow GR = Gray
O = Orange
The first letter indicates the basic wire color and thesecond letter indicates the color of the stripe.
Example: L – Y
L(Blue)
Y(Yellow)
[J] : Indicates a wiring Splice Point (Codes are ”E” for theEngine Room, ”I” for the Instrument Panel, and ”B”for the Body).
The Location of splice Point I 5 is indicated by theshaded section.
[K] : Indicates a shielded cable.
[L] : Indicates the pin number of the connector.The numbering system is different for female andmale connectors.
Example: Numbered in orderfrom upper left tolower right
Numbered in orderfrom upper right tolower left
Female Male
[M] : Indicates a ground point.
The first letter of the code for each ground point(s)indicates the component’s location, e.g, ”E” for theEngine Compartment, ”I” for the Instrument Paneland Surrounding area, and ”B” for the Body andSurrounding area.
[N] : Page No.
[O]
[P]
[Q]
[R]
[S]
[T]
[U]
[V]
2003 TOYOTA TUNDRA (EWD491U)
6
B HOW TO USE THIS MANUAL
Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flowsthrough the rear lights warning light to TERMINAL 4 of the light failure sensor.
STOP LIGHT DISCONNECTION WARNINGWhen the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the currentflowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects thedisconnection and the warning circuit of the light failure sensor is activated.As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lightswarning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warningcircuit on and holds the warning light on until the ignition SW is turned off.
S6 STOP LIGHT SW2–1 : Closed with the brake pedal depressed
L4 LIGHT FAILURE SENSOR1, 2, 7–GROUND : Approx. 12 volts with the stop light SW on
4, 8–GROUND : Approx. 12 volts with the ignition SW at ON position11–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C7 34 L4 36 R7 37
H17 36 R6 37 S6 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
1 18 R/B No.1 (Instrument Panel Left)
@@@@@@@@@
ÀÀÀÀÀÀÀÀÀ
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
IB 20 Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
3C 22 Instrument Panel Wire and J/B No.3 (Instrument Panel Left Side)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE1 42 Floor Wire and Instrument Panel Wire (Left Kick Panel)
BV1 50 Luggage Room Wire and Floor Wire (Luggage Compartment Left)
: GROUND POINTS
Code See Page Ground Points Location
BL 50 Under the Left Quarter Pillar
BO 50 Back Panel Center
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I5 44 Cowl Wire B18 50 Luggage Room Wire
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
7
B
[O] : Explains the system outline.
[P] : Indicates values or explains the function for reference during troubleshooting.
[Q] : Indicates the reference page showing the position on the vehicle of the parts in the system circuit.
Example : Part ”L4” (Light Failure Sensor) is on page 36 of the manual.∗ The letter in the code is from the first letter of the part, and the number indicates its order in parts
starting with that letter.Example : L 4 Á
ÁParts is 4th in orderLight Failure Sensor
[R] : Indicates the reference page showing the position on the vehicle of Relay Block Connectors in the system circuit.
Example : Connector ”1” is described on page 18 of this manual and is installed on the left side of the instrumentpanel.
[S] : Indicates the reference page showing the position on the vehicle of J/B and Wire Harness in the system circuit.
Example : Connector ”3C” connects the Instrument Panel Wire and J/B No.3. It is described on page 22 of thismanual, and is installed on the instrument panel left side.
[T] : Indicates the reference page describing the wiring harness and wiring harness connector (the female wiringharness is shown first, followed by the male wiring harness).
Example : Connector ”IE1” connects the floor wire (female) and Instrument panel wire (male). It is described onpage 42 of this manual, and is installed on the left side kick panel.
[U] : Indicates the reference page showing the position of the ground points on the vehicle.
Example : Ground point ”BO” is described on page 50 of this manual and is installed on the back panel center.
[V] : Indicates the reference page showing the position of the splice points on the vehicle.
Example : Splice point ”I5” is on the Cowl Wire Harness and is described on page 44 of this manual.
2003 TOYOTA TUNDRA (EWD491U)
8
B HOW TO USE THIS MANUAL
The ground points circuit diagram shows the connections from all major parts to the respective ground points. Whentroubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identifythe problem ground quickly. The relationship between ground points ( EA , IB and IC shown below) can also bechecked this way.
I GROUND POINTFAN MAIN RELAY
FAN MAIN RELAY
A/C FAN RELAY NO.2
A/C FAN RELAY NO.3
RADIATOR FAN MOTOR
RETRACT CONTROLRELAY
RETRACT MOTOR RH
RETRACT MOTOR LH
FRONT TURN SIGNAL LIGHT RH
PARKING LIGHT RH
FRONT TURN SIGNALLIGHT LH
PARKING LIGHT LH
DOOR LOCK CONTROLSW RH
DOOR KEY LOCKSW RH
DOOR LOCK MOTORRH
BLOWER RESISTOR
A/C AMPLIFIER
RADIO AND PLAYER
HEATER RELAY
AUTO ANTENNAMOTOR
BLOWER SW
PARKING BRAKE SW
COMBINATION METER
HORN SW [COMB. SW]
TURN SIGNAL FLASHER
DOOR KEY LOCK SW LH
DOOR LOCK MOTOR LH
FUEL CONTROL SW
WOOFER AMPLIFIER
COMBINATION METER
COMBINATION METER
FUEL SENDER
CIGARETTE LIGHTER
O/D MAIN SW
CLOCK
5
5
5
5
4
4
4
4
4BA15
IB18
EA210
3E5
3E6
3G13
3F3
3D1
3B7
ID115
IC33
IA12
E 3
A
AA
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B
W–B
BR
W–B
BR BR
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
BR
W–B
BRBR
BR
W–B
W–B
W–B
W–B
W–B
BR
W–B (4A–GZE)
W–B
A
A
A
I 6
I 6
I 2
I 2
I 2
B 5I 5
I 5
I 5
B 5
B 5
B 5
I 5
I 5
I 3I 3
E 3
E 3
E 3
E 2
E 4
E 5
E 4
E 5
E 6E 4
E 4
B 4
EA
I 4
B 4
B 4
I 4 I 8
IB IC
3C7
4
JUNCTIONCONNECTOR
J 1
4
DOOR LOCK CONTROLRELAY
ELECTRICAL IDLE−UPCUT RELAY (M/T)
FRONT SIDE MARKERLIGHT RH
FRONT SIDE MARKERLIGHT LH
BRAKE FLUID LEVELWARNING SW
UNLOCK WARNINGSW
WIPER AND WASHERSW [COMB. SW]
LIGHT CONTROL SW[COMB. SW]
HEATER CONTROLASSEMBLY
HEATER SERVOMOTOR AMPLIFIER
DIMMER SW[COMB. SW]
CRUISE CONTROLMIRROR SW
REAR WINDOWDEFOGGER SW
POWER WINDOWMASTER SW
POWER WINDOWCONTROL RELAY
DOOR LOCK CONTROL SW
REMOTE CONTROLMIRROR SW
∗ The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.
2003 TOYOTA TUNDRA (EWD491U)
9
B
The ”Current Flow Chart” section, describes which parts each power source (fuses, fusible links, and circuit breakers)transmits current to. In the Power Source circuit diagram, the conditions when battery power is supplied to each systemare explained. Since all System Circuit diagrams start from the power source, the power source system must be fullyunderstood.
Theft Deterrent and Door Lock Control
J POWER SOURCE (Current Flow Chart)
11
1
EA11EA23
7
EB16
E 6
E 7 I 2 I 2
I 2
E 7
E 7
E 7
2
1
1
2
2
2
2
2
B
B
WW
BB
BB
B
W–B
B
B
B
B–O
B–W
W–B
B–W
STARTER RELAY
INJECTION RELAY
15A HAZ–RADIO
7.5A AM2
50A MAIN
1.25B FL MAIN
BATTERY
W W W
W
W
W
R
W–L
WW
G–W
G
15A TAIL
20A DEFOG
15A RAD CIG
TAILRELAY
7.5A DOME
40A DOOR LOCK CB
21
12
48
23
34
G
W–R
P–L
B–Y
B–Y
W–R
AM
2IG
2
AC
C
IG1
AM
1W
W
W–R
W
W
W–B
2 1
1
1
1
1
2
2
2
2
3
4
3
4
1
2
1
2
2
1
11
1
IGNITION SWI 8
Battery 30A AM2 2
Starter S 220A RADIO NO.1
10A HORN
15A EFI
7.5A DOMEShort Pin
10A HAZARD
The chart below shows the route by which current flows from the battery to each electrical source(Fusible Link, Circuit Breaker, Fuse, etc.) and other parts.
Engine Room R/B (See Page 20)
ABSABS and Traction ControlCruise ControlElectronically Controlled Transmission and A/T IndicatorMultiplex Communication System
Cigarette Lighter and Clock
Key Reminder and Seat Belt Warning
STOP
Fuse Page194
214
112
System
DOME
20A
10A
Combination MeterHeadlightInterior Light
2
2
6100A ALT
EB1
POWER SOURCELight Auto Turn Off
187180166210
230
122
10A ECU–B
560A ABS
2
6Fusible Link Block
2
∗ The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.
BLACK
[D]
K CONNECTOR LIST
J4 K1 K2 L1
L2 L3 L4 M1 M2 M3
M4 N1 N2 O1 O2
DARK GRAY
GRAY
DARK GRAYBLACKGRAYGRAY
A B BA A B C C C
D DD D
AA
AA
AAA A 1
1 2 1 2
1 12 1
2
1 2 36 7 8 9 101112
4 5
71 23 45 6 8
4321
1 2 3 2 3 48 9 105 6
17
1 2 1 1
[A]
[C]
[B]J3
1 2 1 2
6 7 8
1 2A
A
A
AA AA B BA A B C C C
D DD D
I14 I15 I16 J1 J2DARK GRAY GRAY BLACK
2003 TOYOTA TUNDRA (EWD491U)
10
B HOW TO USE THIS MANUAL
[A] : Indicates connector to be connected to a part. (The numeral indicates the pin No.)
[B] : Junction ConnectorIndicates a connector which is connected to a short terminal.
Junction Connector
Short TerminalSame Color
Junction connector in this manual include a short terminal which isconnected to a number of wire harnesses. Always performinspection with the short terminal installed. (When installing thewire harnesses, the harnesses can be connected to any positionwithin the short terminal grouping. Accordingly, in other vehicles,the same position in the short terminal may be connected to a wireharness from a different part.)Wire harness sharing the same short terminal grouping have thesame color.
[C] : Parts CodeThe first letter of the code is taken from the first letter of part, and the numbers indicates its order in parts whichstart with the same letter.
[D] : Connector ColorConnectors not indicated are milky white in color.
2003 TOYOTA TUNDRA (EWD491U)
11
B
[A] : Part Code
[B] : Part Name
[C] : Part NumberToyota Part Number are indicated.
Not all of the above part numbers of the connector are established for the supply. In case of ordering a connectoror terminal with wire, please confirm in advance if there is supply for it using “Parts Catalog News” (published byParts Engineering Administration Dept.).
A 5ÁÁÁÁ
90980–11194
L PART NUMBER OF CONNECTORSCode Part Name Part Number Code Part Name Part Number
A 1
A 2
A 4
A 6
A 7
A/C Ambient Temp. Sensor
A/C Condenser Fan Motor
A/C Triple Pressure SW (A/C Dual andSingle Pressure SW)
A/T Oil Temp. Sensor
ABS Actuator
ABS Actuator
90980–11070
90980–11237
90980–10943
90980–11413
90980–11151
D 4
D 5
D 6
D 7
D 8
D 9
D10
D11
Diode (Door Courtesy Light)
Diode (Key Off Operation)
Diode (Luggage Compartment Light)
Door Lock Control Relay
Door Courtesy Light LH
Door Courtesy Light RH
Door Courtesy SW LH
Door Courtesy SW RH
90980–11608
90980–10962
90980–11608
90980–10848
90980–11148
90980–11097
A 8 ABS Speed Sensor Front LH 90980–10941
A 9 ABS Speed Sensor Front RH
90980–11856A10 Airbag Sensor Front LH
A11 Airbag Sensor Front RH
D12 Door Courtesy SW Front LH
90980–11156D13 Door Courtesy SW Front RH
D14 Door Courtesy SW Rear LH
Door Courtesy SW Rear RHD15
[B] ÁÁÁÁ
[C]
A12 Auto Antenna Motor 90980–11194
A 3 A/C Condenser Fan Relay 90980–10940
[A]
90980–11009
90980–11002
D16
D17
Door Key Lock and Unlock SW LH
Door Key Lock and Unlock SW RH90980–11170
To Ignition SWIG Terminal
Fuse
VoltmeterSW 1
Relay
SW 2 Solenoid
[A]
[B]
[C]
Ohmmeter
SW
Ohmmeter
Diode
Digital Type Analog Type
2003 TOYOTA TUNDRA (EWD491U)
12
C TROUBLESHOOTING
VOLTAGE CHECK
(a) Establish conditions in which voltage is present at the checkpoint.Example:
[A] – Ignition SW on[B] – Ignition SW and SW 1 on[C] – Ignition SW, SW 1 and Relay on (SW 2 off)
(b) Using a voltmeter, connect the negative lead to a good groundpoint or negative battery terminal, and the positive lead to theconnector or component terminal.This check can be done with a test light instead of a voltmeter.
CONTINUITY AND RESISTANCE CHECK
(a) Disconnect the battery terminal or wire so there is no voltagebetween the check points.
(b) Contact the two leads of an ohmmeter to each of the checkpoints.
If the circuit has diodes, reverse the two leads and checkagain.When contacting the negative lead to the diode positive sideand the positive lead to the negative side, there should becontinuity.When contacting the two leads in reverse, there should be nocontinuity.
(c) Use a volt/ohmmeter with high impedance (10 kΩ/Vminimum) for troubleshooting of the electrical circuit.
To Ignition SWIG Terminal
Test Light
RelayLight
SW 2 Solenoid
Disconnect
Short [A]
DisconnectDisconnect
SW 1
Fuse Case
Short [B]
Short [C]
Pull Up
Press Down Press Down
Pull Up
2003 TOYOTA TUNDRA (EWD491U)
13
C
FINDING A SHORT CIRCUIT
(a) Remove the blown fuse and disconnect all loads of the fuse.(b) Connect a test light in place of the fuse.(c) Establish conditions in which the test light comes on.
Example:[A] – Ignition SW on[B] – Ignition SW and SW 1 on[C] – Ignition SW, SW 1 and Relay on (Connect the
Relay) and SW 2 off (or Disconnect SW 2)
(d) Disconnect and reconnect the connectors while watching thetest light.The short lies between the connector where the test lightstays lit and the connector where the light goes out.
(e) Find the exact location of the short by lightly shaking theproblem wire along the body.
CAUTION:(a) Do not open the cover or the case of the ECU unless
absolutely necessary. (If the IC terminals are touched,the IC may be destroyed by static electricity.)
(b) When replacing the internal mechanism (ECU part) ofthe digital meter, be careful that no part of your body orclothing comes in contact with the terminals of leadsfrom the IC, etc. of the replacement part (spare part).
DISCONNECTION OF MALE AND FEMALECONNECTORS
To pull apart the connectors, pull on the connector itself, notthe wire harness.
HINT : Check to see what kind of connector you aredisconnecting before pulling apart.
10
3
0.21
1
(mm)
Reference:
ToolUpExample:(Case 1)
Terminal Retainer
Terminal Retainer
[Retainer at Full Lock Position]
[Retainer at Temporary Lock Position]
StopperTerminalRetainer
SecondaryLocking Device
Example:(Case 2)
2003 TOYOTA TUNDRA (EWD491U)
14
C TROUBLESHOOTING
HOW TO REPLACE TERMINAL(with terminal retainer or secondary locking device)
1. PREPARE THE SPECIAL TOOL
HINT : To remove the terminal from the connector, pleaseconstruct and use the special tool or like object shown onthe left.
2. DISCONNECT CONNECTOR
3. DISENGAGE THE SECONDARY LOCKING DEVICE OR
TERMINAL RETAINER.
(a) Locking device must be disengaged before the terminallocking clip can be released and the terminal removed fromthe connector.
(b) Use a special tool or the terminal pick to unlock the secondarylocking device or terminal retainer.
NOTICE:Do not remove the terminal retainer from connector body.
[A] For Non–Waterproof Type Connector
HINT : The needle insertion position varies according to the
connector’s shape (number of terminals etc.), so
check the position before inserting it.
”Case 1”
Raise the terminal retainer up to the temporary lock
position.
”Case 2”
Open the secondary locking device.
ToolTab
Tab
TerminalRetainer
Access Hole( Mark)
Tool
Tool
[Female]
Example:
[Male]
(Case 1)
[Male] [Female]
Retainerat Full Lock Position
Retainerat Temporary Lock Position
Terminal Retainer
[Male] Press Down [Female]Press Down
ToolTool
Example:(Case 2)
2003 TOYOTA TUNDRA (EWD491U)
15
C
[B] For Waterproof Type Connector
HINT : Terminal retainer color is differentaccording to connector body.
Example:Terminal Retainer : Connector BodyBlack or White : GrayBlack or White : Dark GrayGray or White : Black
”Case 1”Type where terminal retainer is pulledup to the temporary lock position (PullType).
Insert the special tool into the terminalretainer access hole (Mark) and pullthe terminal retainer up to thetemporary lock position.
HINT : The needle insertion position variesaccording to the connector’s shape(Number of terminals etc.), so checkthe position before inserting it.
”Case 2”Type which cannot be pulled as far asPower Lock insert the tool straight intothe access hole of terminal retainer asshown.
Retainer atFull Lock Position
[Male] [Female]
Retainer atTemporary Lock Position
Locking Lug
Tool
2003 TOYOTA TUNDRA (EWD491U)
16
C TROUBLESHOOTING
Push the terminal retainer down to the temporary lock position.
(c) Release the locking lug from terminal and pull the terminal outfrom rear.
4. INSTALL TERMINAL TO CONNECTOR
(a) Insert the terminal.HINT:1. Make sure the terminal is positioned correctly.2. Insert the terminal until the locking lug locks firmly.3. Insert the terminal with terminal retainer in the temporary lock
position.
(b) Push the secondary locking device or terminal retainer in tothe full lock position.
5. CONNECT CONNECTOR
∗ The titles given inside the components are the names of the terminals (terminal codes) and are not treated as beingabbreviations.
2003 TOYOTA TUNDRA (EWD491U)
17
ABBREVIATIONS D
ABBREVIATIONS
The following abbreviations are used in this manual.
2WD = Two Wheel Drive Vehicles
4WD = Four Wheel Drive Vehicles
A/C = Air Conditioning
A/T = Automatic Transmission
ABS = Anti–Lock Brake System
ACIS = Acoustic Control Induction System
ADD = Automatic Disconnecting Differential
COMB. = Combination
ECU = Electronic Control Unit
ESA = Electronic Spark Advance
ETCS–i = Electronic Throttle Control System–intelligent
EVAP = Evaporative Emission
J/B = Junction Block
LH = Left–Hand
M/T = Manual Transmission
O/D = Overdrive
R/B = Relay Block
RH = Right–Hand
SFI = Sequential Multiport Fuel Injection
SRS = Supplemental Restraint System
SW = Switch
TEMP. = Temperature
TVIP = TOYOTA Vehicle Intrusion Protection
VSV = Vacuum Switching Valve
w/ = With
w/o = Without
2003 TOYOTA TUNDRA (EWD491U)
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E GLOSSARY OF TERMS AND SYMBOLS
BATTERYStores chemical energy andconverts it into electrical energy.Provides DC current for the auto’svarious electrical circuits.
GROUNDThe point at which wiring attaches tothe Body, thereby providing a returnpath for an electrical circuit; without aground, current cannot flow.
CAPACITOR (Condenser)A small holding unit for temporarystorage of electrical voltage.
HEADLIGHTSCurrent flow causes a headlightfilament to heat up and emit light. Aheadlight may have either a single(1) filament or a double (2) filament
1. SINGLE FILAMENT
CIGARETTE LIGHTERAn electric resistance heatingelement.
2. DOUBLE FILAMENT
CIRCUIT BREAKERBasically a reusable fuse, a circuitbreaker will heat and open if toomuch current flows through it.Some units automatically reset whencool, others must be manually reset.
HORNAn electric device which sounds aloud audible signal.
DIODEA semiconductor which allowscurrent flow in only one direction.
IGNITION COILConverts low–voltage DC currentinto high–voltage ignition current forfiring the spark plugs.
DIODE, ZENERA diode which allows current flow in onedirection but blocks reverse flow only upto a specific voltage. Above that potential,it passes the excess voltage. This acts asa simple voltage regulator.
LIGHTCurrent flow through a filamentcauses the filament to heat up andemit light.
PHOTODIODEThe photodiode is a semiconductorwhich controls the current flowaccording to the amount of light.
LED (LIGHT EMITTING DIODE)Upon current flow, these diodes emitlight without producing the heat of acomparable light.
DISTRIBUTOR, IIAChannels high–voltage current fromthe ignition coil to the individualspark plugs.
METER, ANALOGCurrent flow activates a magneticcoil which causes a needle to move,thereby providing a relative displayagainst a background calibration.
FUSEA thin metal strip which burns throughwhen too much current flows through it,thereby stopping current flow andprotecting a circuit from damage.
FUSIBLE LINK
METER, DIGITALCurrent flow activates one or manyLED’s, LCD’s, or fluorescentdisplays, which provide a relative ordigital display.
FUEL
FUSIBLE LINKA heavy–gauge wire placed in highamperage circuits which burns through onoverloads, thereby protecting the circuit.The numbers indicate the crosssectionsurface area of the wires.
(for Medium Current Fuse)
(for High Current Fuse or Fusible Link)
MOTORA power unit which convertselectrical energy into mechanicalenergy, especially rotary motion.
M
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E
RELAYBasically, an electrically operatedswitch which may be normallyclosed (1) or open (2).Current flow through a small coilcreates a magnetic field which eitheropens or closes an attached switch.
1. NORMALLY CLOSED
2. NORMALLY OPEN
SWITCH, MANUALOpens and closesi it th b
SPEAKERAn electromechanical device whichcreates sound waves from currentflow.
RELAY, DOUBLE THROWA relay which passes currentthrough one set of contacts or theother.
circuits, therebystopping (1) orallowing (2) currentflow.
1. NORMALLY OPEN
2. NORMALLY CLOSED
RESISTORAn electrical component with a fixedresistance, placed in a circuit toreduce voltage to a specific value.
SWITCH, DOUBLE THROWA switch which continuously passescurrent through one set of contactsor the other.
RESISTOR, TAPPEDA resistor which supplies two ormore different non adjustableresistance values.
SWITCH, IGNITIONA key operated switch with severalpositions which allows variouscircuits, particularly the primaryignition circuit, to becomeoperational.
RESISTOR, VARIABLE or RHEOSTATA controllable resistor with a variablerate of resistance.Also called a potentiometer orrheostat.
SENSOR (Thermistor)A resistor which varies its resistancewith temperature.
SWITCH, WIPER PARKAutomatically returns wipers to thestop position when the wiper switchis turned off.
(Reed Switch Type)
SENSOR, SPEEDUses magnetic impulses to openand close a switch to create a signalfor activation of other components.
TRANSISTORA solidstate device typically used asan electronic relay; stops or passescurrent depending on the voltageapplied at ”base”.
SHORT PINUsed to provide an unbrokenconnection within a junction block.
WIRESWires are always drawn asstraight lines on wiringdiagrams.Crossed wires (1) without ablack dot at the junction are
t j i d
(1) NOT CONNECTED
SOLENOIDAn electromagnetic coil which formsa magnetic field when current flows,to move a plunger, etc.
jnot joined;crossed wires (2) with ablack dot or octagonal ( )mark at the junction arespliced (joined)connections.
(2) SPLICED
2003 TOYOTA TUNDRA (EWD491U)
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F RELAY LOCATIONS
[Engine Compartment]
[Instrument Panel]
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F
2 : Engine Room R/B Engine Compartment Left (See Page 20)
2003 TOYOTA TUNDRA (EWD491U)
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F RELAY LOCATIONS
: Driver Side J/B and
Integration RelayLower Finish Panel (See Page 20)
[w/o Daytime Running Light]
2003 TOYOTA TUNDRA (EWD491U)
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F
2003 TOYOTA TUNDRA (EWD491U)
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F RELAY LOCATIONS
[Driver Side J/B and Integration Relay Inner Circuit](w/o Daytime Running Light)
2003 TOYOTA TUNDRA (EWD491U)
25
MEMO
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26
F RELAY LOCATIONS
: Driver Side J/B and
Integration RelayLower Finish Panel (See Page 20)
[w/ Daytime Running Light]
2003 TOYOTA TUNDRA (EWD491U)
27
F
2003 TOYOTA TUNDRA (EWD491U)
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F RELAY LOCATIONS
[Driver Side J/B and Integration Relay Inner Circuit](w/ Daytime Running Light)
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MEMO
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40
G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness: Location of Ground Points
[2UZ–FE]
: Location of Splice Points
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G
Connector Joining Wire Harness and Wire Harness
147
36
258
2
5
8
3
6
1
4
7
1 23 4
2 14 3
1 2 3
654
3 2 1456
1 2 3 123 1 2 3
654
3 2 1456
EA1 BLACK EB1 BLACK
EC1 DARK GRAY EC2 GRAY ED1 GRAY
Code Joining Wire Harness and Wire Harness (Connector Location)
EA1 Cowl Wire and Engine Room Main Wire (Right Fender)
EB1 Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
EC1Engine No 2 Wire and Engine Wire (Near the Starter)
EC2Engine No.2 Wire and Engine Wire (Near the Starter)
ED1 Engine No.2 Wire and Differential Wire (Near the Transmission)
2003 TOYOTA TUNDRA (EWD491U)
42
G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness: Location of Ground Points
[5VZ–FE]
: Location of Splice Points
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
147
36
258
2
5
8
3
6
1
4
7
1 23 4
2 14 3
1 2 3
654
3 2 14563
1 2
3
12 1 2 2 1
EA1 BLACK EB1 BLACK
EE1 DARK GRAY EF1 GRAY EG1 GRAY
Code Joining Wire Harness and Wire Harness (Connector Location)
EA1 Cowl Wire and Engine Room Main Wire (Right Fender)
EB1 Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
EE1 Sensor Wire and Engine Wire (Over the Cylinder Head)
EF1 Engine Wire and Sensor Wire (Over the Cylinder Head)
EG1 Engine Wire and Differential Wire (Front Differential Upper Side)
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44
G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness
: Location of Ground Points
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
1 2
2 1
12 3
4
56 7 8 9 10 11
12
1314 15 16 17 18 19 20
2122 23 24 25 26
43 2
1
1211 10 9 8 7 6
5
2120 19 18 17 16 15 14
1326 25 24 23 22
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
9 8 7 6 5 4 3 2 1
18 17 16 15 14 13 12 11 10
1 2 3 4 4 3 2 1
1 23 4 5 6 78 9 10 11 12
12
34567
89101112
1 2 3 4 56 7 8 9 10
5 4 3 2 110 9 8 7 6
1 2 2 1
IA1 YELLOW IA4
IA5 IB2
IB3 IB4 IC1GRAY
Code Joining Wire Harness and Wire Harness (Connector Location)
IA1
IA4 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA5
g ( )
IB2
IB3 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB4
( )
IC1 Cowl Wire and Roof Wire (Left Side of Instrument Panel)
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46
G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness
: Location of Splice Points
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
Code Joining Wire Harness and Wire Harness (Connector Location)
ID1Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
ID2Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
IE1
IE2 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
IF1
IF3 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF4
( g )
II1 Cowl Wire and Cowl Wire (Instrument Panel Reinforcement RH)
2003 TOYOTA TUNDRA (EWD491U)
48
G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness: Location of Ground Points
[Access Cab]
: Location of Splice Points
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
1
2
1
2
1 23 4 5 6 78 9 10 11 12
12
34567
89101112
1 2
3 4 5 6123456
1
2
1
2
1 23 4
2 14 3
1 2 3
4 5 6
3 2 1
6 5 4
1 2 3
4 5 6
3 2 1
6 5 41 2 3 4 5 5 4 3 2 1 1 2 3 4 4 3 2 1
23 41 12
4 3
21
3 4
2 1
34 2 31 23 1
BA1 BLACKBB1 BB2
BC1 BD1 BE2
BLACKBF2 BLACK BG2 BH1
BI1 BK1 GRAY BK2 GRAY(w/o Power Seat)
Code Joining Wire Harness and Wire Harness (Connector Location)
BA1 Front Door LH Wire and Speaker Tweeter Wire LH (Inside of Front Door LH)
BB1Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB2Frame Wire and Cowl Wire (Under the Driver’s Seat)
BC1 Front Door RH Wire and Speaker Tweeter Wire RH (Inside of Front Door RH)
BD1 Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)
BE2 Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
BI1 Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
BK1Frame Wire and Frame No 3 Wire (Near the License Plate Light)
BK2Frame Wire and Frame No.3 Wire (Near the License Plate Light)
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G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness: Location of Ground Points
[Standard Cab]
: Location of Splice Points
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
1
2
1
21 23 4 5 6 78 9 10 11 12
12
34567
89101112
1 2
3 4 5 6123456
1
2
1
2
23 41 12
4 3
21
3 4
2 1
34
2 31 23 1
1 23 4
2 14 3
BA1 BLACKBB1 BB2
BC1 BD1 BI1 GRAYBK1
GRAY
BK2BLACK
(w/o Power Seat)
Code Joining Wire Harness and Wire Harness (Connector Location)
BA1 Front Door LH Wire and Speaker Tweeter Wire LH (Inside of Front Door LH)
BB1Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB2Frame Wire and Cowl Wire (Under the Driver’s Seat)
BC1 Front Door RH Wire and Speaker Tweeter Wire RH (Inside of Front Door RH)
BD1 Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)
BI1 Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
BK1Frame Wire and Frame No 3 Wire (Near the License Plate Light)
BK2Frame Wire and Frame No.3 Wire (Near the License Plate Light)
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G ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness
2003 TOYOTA TUNDRA (EWD491U)
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G
Connector Joining Wire Harness and Wire Harness
23 41 12
4 31 2 2 1
BI1 BJ1(w/ Power Seat)
Code Joining Wire Harness and Wire Harness (Connector Location)
BI1 Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
BJ1 Seat No.1 Wire and Seat No.2 Wire (Under the Driver’s Seat)
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54
MEMO
2003 TOYOTA TUNDRA (EWD491U)
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G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment[2UZ–FE]
A 1 A/C Dual Pressure SWA 3 A/C Magnetic Clutch and Lock SensorA 4 A/T Oil Temp. SensorA 5 ABS Actuator with ECUA 6 ABS Speed Sensor Front LHA 7 ABS Speed Sensor Front RHA 9 ADD ActuatorA 11 Airbag Sensor Front LHA12 Airbag Sensor Front RH
B 2 Brake Fluid Level Warning SW
C 1 Camshaft Position SensorC 2 Crankshaft Position Sensor
D 2 Daytime Running Light ResistorD 3 Detection SW (Transfer 4WD Position)D 4 Detection SW (Transfer L4 Position)
E 1 Electronically Controlled Transmission SolenoidE 2 Engine Coolant Temp. Sensor
F 1 Front Fog Light LHF 2 Front Fog Light RHF 3 Front Turn Signal Light and Parking Light LHF 4 Front Turn Signal Light and Parking Light RHF 5 Fuel Pump Resistor
G 1 GeneratorG 2 Generator
H 1 Headlight LHH 2 Headlight RHH 3 Heated Oxygen Sensor (Bank 1 Sensor 1)H 4 Heated Oxygen Sensor (Bank 1 Sensor 2)H 5 Heated Oxygen Sensor (Bank 2 Sensor 1)H 6 Heated Oxygen Sensor (Bank 2 Sensor 2)H 7 Horn LHH 8 Horn RH
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G
Position of Parts in Engine Compartment[2UZ–FE]
I 3 Igniter and Ignition Coil No.1I 4 Igniter and Ignition Coil No.2I 5 Igniter and Ignition Coil No.3I 6 Igniter and Ignition Coil No.4I 7 Igniter and Ignition Coil No.5I 8 Igniter and Ignition Coil No.6I 9 Igniter and Ignition Coil No.7I 10 Igniter and Ignition Coil No.8I 14 Injector No.1I 15 Injector No.2I 16 Injector No.3I 17 Injector No.4I 18 Injector No.5I 19 Injector No.6I 20 Injector No.7I 21 Injector No.8
J 1 Junction ConnectorJ 2 Junction ConnectorJ 18 Junction Connector
K 1 Knock Sensor 1K 2 Knock Sensor 2
M 1 Mass Air Flow Meter
N 1 Noise Filter
O 1 O/D Direct Clutch Speed SensorO 6 Oil Pressure Sender
P 1 Park/Neutral Position SW
S 1 StarterS 2 Starter
T 2 Throttle Position SensorT 3 Transfer Shift ActuatorT 10 TVIP Buzzer
V 2 Vehicle Speed Sensor (Combination Meter)V 3 Vehicle Speed Sensor
(Electronically Controlled Transmission)V 4 VSV (EVAP)
W 2 Washer Motor and Washer Level SensorW 3 Water Temp. SenderW 4 Wiper Motor
2003 TOYOTA TUNDRA (EWD491U)
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G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment[5VZ–FE]
A 1 A/C Dual Pressure SWA 2 A/C Magnetic ClutchA 4 A/T Oil Temp. SensorA 5 ABS Actuator with ECUA 6 ABS Speed Sensor Front LHA 7 ABS Speed Sensor Front RHA 8 Accel Position SensorA 9 ADD ActuatorA10 Air Fuel Ratio Sensor (Bank 1 Sensor 1)A 11 Airbag Sensor Front LHA12 Airbag Sensor Front RH
B 1 Back–Up Light SWB 2 Brake Fluid Level Warning SW
C 1 Camshaft Position SensorC 2 Crankshaft Position Sensor
D 2 Daytime Running Light ResistorD 3 Detection SW (Transfer 4WD Position)D 4 Detection SW (Transfer L4 Position)D 5 Detection SW (Transfer Neutral Position)
E 1 Electronically Controlled Transmission SolenoidE 2 Engine Coolant Temp. Sensor
F 1 Front Fog Light LHF 2 Front Fog Light RHF 3 Front Turn Signal Light and Parking Light LHF 4 Front Turn Signal Light and Parking Light RH
G 1 GeneratorG 2 Generator
H 1 Headlight LHH 2 Headlight RHH 7 Horn LHH 8 Horn RH
2003 TOYOTA TUNDRA (EWD491U)
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G
Position of Parts in Engine Compartment[5VZ–FE]
I 2 IgniterI 11 Ignition Coil No.1I 12 Ignition Coil No.2I 13 Ignition Coil No.3I 14 Injector No.1I 15 Injector No.2I 16 Injector No.3I 17 Injector No.4I 18 Injector No.5I 19 Injector No.6
J 1 Junction ConnectorJ 2 Junction ConnectorJ 18 Junction Connector
K 1 Knock Sensor 1K 2 Knock Sensor 2
M 1 Mass Air Flow Meter
N 1 Noise Filter
O 2 Oil Pressure SWO 6 Oil Pressure Sender
P 1 Park/Neutral Position SWP 2 Power Steering Oil Pressure SW
S 1 StarterS 2 Starter
T 1 Throttle Control MotorT 2 Throttle Position SensorT 10 TVIP Buzzer
V 2 Vehicle Speed Sensor (Combination Meter)V 3 Vehicle Speed Sensor
(Electronically Controlled Transmission)V 4 VSV (EVAP)
W 2 Washer Motor and Washer Level SensorW 3 Water Temp. SenderW 4 Wiper Motor
2003 TOYOTA TUNDRA (EWD491U)
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G ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A13 A/C ThermistorA15 Air Inlet Control Servo MotorA16 Airbag Squib (Front Passenger Airbag Assembly)A17 Airbag Squib (Steering Wheel Pad)A18 Ashtray IlluminationA20 Accelerator Pedal Position SensorA22 ACC Cut Relay
B 3 Back–UP Light RelayB 4 Blower MotorB 5 Blower ResistorB 6 Blower SW and Defroster Mode SW
C 4 Center Airbag Sensor AssemblyC 5 Center Airbag Sensor AssemblyC 6 Center Airbag Sensor AssemblyC 7 Cigarette LighterC 8 Cigarette Lighter IlluminationC 9 Clutch Start Cancel SWC10 Clutch Start SWC11 Combination MeterC12 Combination Meter
C13 Combination MeterC14 Combination MeterC15 Combination SWC16 Combination SWC17 Combination SWC18 Cruise Control Clutch SW
D 6 Data Link Connector 3D 8 Diode (A/T)D 9 Diode (Door Courtesy)D10 Diode (Idle–Up)D11 Diode (Power Window System)D27 Diode (Step Light)D28 Diode (Door Lock)D29 Diode (TVIP)D30 Diode (Unlock Warning)
E 3 Engine Control ModuleE 4 Engine Control ModuleE 5 Engine Control ModuleE 6 Engine Control ModuleE 7 Engine Control Module
2003 TOYOTA TUNDRA (EWD491U)
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G
Position of Parts in Instrument Panel
F 7 4WD Control ECU
G 3 Glove Box Light
I 22 Ignition Key Cylinder LightI 23 Ignition SWI 24 Integration Control and PanelI 25 Integration Control and Panel
J 3 Junction ConnectorJ 4 Junction ConnectorJ 5 Junction ConnectorJ 7 Junction ConnectorJ 8 Junction ConnectorJ 9 Junction ConnectorJ 10 Junction ConnectorJ 11 Junction ConnectorJ 12 Junction ConnectorJ 13 Junction ConnectorJ 19 Junction ConnectorJ 20 Junction ConnectorJ 21 Junction ConnectorJ 22 Junction ConnectorJ 23 Junction ConnectorJ 24 Junction Connector
M 4 Mirror Heater SW
O 4 O/D Main SWO 5 Option Connector
P 3 Passenger Airbag Manual On–Off SWP 4 Passenger Airbag Manual On–Off SWP 5 Parking Brake SWP 6 Power OutletP 7 Power OutletP21 Power Window Control SW (Back Window)
R 1 Radio and PlayerR 2 Radio and PlayerR 3 RheostatR11 Radio and PlayerS 3 Step LightS 4 Stop Light SWS 8 Short PinS 9 Short Connector (TVIP)S10 Security Indicator and
Grass Brakeage Sensor Microphone
T 4 Transmission Control RelayT 5 Turn Signal FlasherT 9 Trailer ConverterT 11 TVIP ECUT 12 TVIP ECUT 13 TVIP ECU
U 1 Unlock Warning SW
2003 TOYOTA TUNDRA (EWD491U)
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G ELECTRICAL WIRING ROUTING
Position of Parts in Body[Access Cab]
A19 ABS Speed Sensor Rear
B 7 Buckle SW LH
D14 Door Courtesy Light LHD15 Door Courtesy Light RHD16 Door Courtesy SW Front LHD17 Door Courtesy SW Front RHD18 Door Courtesy SW Rear LH LowerD19 Door Courtesy SW Rear LH UpperD20 Door Courtesy SW Rear RH LowerD21 Door Courtesy SW Rear RH UpperD22 Door Key Lock and Unlock SW LHD23 Door Key Lock and Unlock SW RHD24 Door Lock Control SW RHD25 Door Lock Motor and Door Unlock Detection SW LHD26 Door Lock Motor and Door Unlock Detection SW RH
F 8 Front Door Speaker LHF 9 Front Door Speaker RHF 10 Fuel Pump and Sender
H 9 Heated Oxygen Sensor (Bank 1 Sensor 2)H10 High Mounted Stop Light and Cargo Light
I 26 Interior Light
J 14 Junction ConnectorJ 15 Junction Connector
L 1 License Plate Light LHL 2 License Plate Light RH
P 8 Personal LightP 9 Power Window Control SW RHP10 Power Window Master SWP 11 Power Window Motor Front LHP12 Power Window Motor Front RHP13 Pretensioner LHP14 Pretensioner RHP22 Power Window Motor (Back Window)
R 4 Rear Combination Light LHR 5 Rear Combination Light RHR 6 Rear Door Speaker LHR 7 Rear Door Speaker RHR 8 Remote Control Mirror LHR 9 Remote Control Mirror RHR10 Remote Control Mirror SW
S 5 Seat Belt Warning Occupant Detection Sensor
T 6 Trailer SocketT 7 Tweeter LHT 8 Tweeter RH
V 1 Vapor Pressure SensorV 6 Vanity Light LHV 7 Vanity Light RHV 9 VSV (Canister Closed Valve)
2003 TOYOTA TUNDRA (EWD491U)
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G
Position of Parts in Body[Standard Cab]
A19 ABS Speed Sensor Rear
B 7 Buckle SW LH
D14 Door Courtesy Light LHD15 Door Courtesy Light RHD16 Door Courtesy SW Front LHD17 Door Courtesy SW Front RHD22 Door Key Lock and Unlock SW LHD23 Door Key Lock and Unlock SW RHD24 Door Lock Control SW RHD25 Door Lock Motor and Door Unlock Detection SW LHD26 Door Lock Motor and Door Unlock Detection SW RH
F 8 Front Door Speaker LHF 9 Front Door Speaker RHF 10 Fuel Pump and Sender
H 9 Heated Oxygen Sensor (Bank 1 Sensor 2)H10 High Mounted Stop Light and Cargo Light
I 26 Interior Light
J 14 Junction ConnectorJ 15 Junction Connector
L 1 License Plate Light LHL 2 License Plate Light RH
P 8 Personal LightP 9 Power Window Control SW RHP10 Power Window Master SWP 11 Power Window Motor Front LHP12 Power Window Motor Front RHP13 Pretensioner LHP14 Pretensioner RH
R 4 Rear Combination Light LHR 5 Rear Combination Light RHR 8 Remote Control Mirror LHR 9 Remote Control Mirror RHR10 Remote Control Mirror SW
S 5 Seat Belt Warning Occupant Detection Sensor
T 6 Trailer SocketT 7 Tweeter LHT 8 Tweeter RH
V 1 Vapor Pressure SensorV 9 VSV (Canister Closed Valve)
2003 TOYOTA TUNDRA (EWD491U)
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G ELECTRICAL WIRING ROUTING
Position of Parts in Seat
B 7 Buckle SW LH
J 16 Junction ConnectorJ 17 Junction Connector
L 3 Lumber Support Control SW (Driver’s Seat)
P15 Power Seat Motor (Driver’s Seat Front Vertical Control)P16 Power Seat Control SW (Driver’s Seat)P17 Power Seat Motor (Driver’s Seat Rear Vertical Control)P18 Power Seat Motor (Driver’s Seat Reclining Control)P19 Power Seat Motor (Driver’s Seat Slide Control)P20 Power Seat Motor
(Driver’s Seat Lumber Support Control)
2003 TOYOTA TUNDRA (EWD491U)
39
MEMO
2003 TOYOTA TUNDRA (EWD491U)
55
SYSTEM CIRCUITS H
2003 TOYOTA TUNDRAELECTRICAL WIRING DIAGRAM
SYSTEM CIRCUITSPage
ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156AIR CONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240BACK–UP LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108CARGO LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74CIGARETTE LIGHTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214CLOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216COMBINATION METER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234CRUISE CONTROL (2UZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160CRUISE CONTROL (5VZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164DOOR LOCK CONTROL (w/ DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . 184DOOR LOCK CONTROL (w/o DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . 190ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR (2UZ–FE) . 144ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR (5VZ–FE) . 150ENGINE CONTROL (2UZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76ENGINE CONTROL (5VZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88FOG LIGHT (w/ DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104FOG LIGHT (w/o DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106HEADLIGHT (w/ DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98HEADLIGHT (w/o DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102HORN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218IGNITION (2UZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68IGNITION (5VZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72ILLUMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112INTEGRATION CONTROL AND PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138INTERIOR LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116KEY REMINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210LIGHT AUTO TURN OFF (w/ DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . 124LIGHT AUTO TURN OFF (w/o DAYTIME RUNNING LIGHT) . . . . . . . . . . . . . . . . . . . . . . . . 128MIRROR HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226POWER OUTLET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214POWER SEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56POWER WINDOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204RADIO AND PLAYER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232REMOTE CONTROL MIRROR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228SEAT BELT WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210SRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169STARTING (2UZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64STARTING (5VZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60STOP LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122TAILLIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110TRAILER TOWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132TURN SIGNAL AND HAZARD WARNING LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120TVIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196WIPER AND WASHER (w/ INT TIME SW MECHANISM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220WIPER AND WASHER (w/o INT TIME SW MECHANISM) . . . . . . . . . . . . . . . . . . . . . . . . . . 224WIRELESS DOOR LOCK CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1964WD (2UZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1744WD (5VZ–FE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
2003 TOYOTA TUNDRA (EWD491U)
56
POWER SOURCE
5
1
3
2
1 2
21
21
21
21
21
21
1 2
1 2
1 2
1 2
140A ALT(*1)100A ALT(*2)
30A TOWING
20A HAZ
40A ABS2
15A EFI NO. 1
50A J/B
30A AM2
40A AM1
H–LP RELAY
20A FOG
50A HTR
15A MIR HTR
2
2
2
B2
2
2
POWER OUTLET RELAY
2
HTR RELAY
5
1
3
2
2
5
1
3
2
4
2 2
3
1
5
2
2 2
22
2
B
L–R
W
W–R
W–G
W–L
R–B
W–G(*3)
G(*3)R–B
W–LB–R
W–G
W–R
R
W
BA
TTE
RY
DIMMER RELAY
R–B
B–L
B
JUNCTIONCONNECTOR
J 1
(*3)
EFI RELAY
( *4)
(* 4)
3
2
5
4
1 2
10A ETCS(*5)15A ETCS(*6)
12
2 1
2 1
30A TOW TAIL
30A SUB BATT
30A TOW BRK
( *1)
( *2)B
2
R–B
( *3)
1
21 2
7. 5A ALT–S
12SHORT PIN
2B
5A ECU–B
21
10A DOME
21
20A RADIO
21
30A ABS3
12
30A ST3
12
2003 TOYOTA TUNDRA (EWD491U)
57
(*4)
31
1 2
31
1 2
1 2
10A EFI NO. 2
10A HEAD RH
2
2
15A ACC
5A ECU IG
2
7
3
4
6
8
AM2
AM1
ACC
IG1
5A TURN
IG2
ST2
1 2
1I
4
1K
2
1I2
1I1
2
2
15A PWR OUTLET 1
1 2
1 2
2
* 3 : W/ DAYTIME RUNNING LIGHT
B
L–R
W
W–R
W–G
W–L
R–B
W–G(*3)
G(*3)
W–G
B–Y
B–R
G–B
L–R
10A A/C
IGNITION SWI23
10A GAUGE
20A 4WD
20A WIP
5A IGN
10A HEAD LH
30A POWER
7. 5A OBD
5A CARGO LP
15A STOP
15A TAIL
10A HORN
10A HEAD RL
10A HEAD LL
* 4 : W/O DAYTIME RUNNING LIGHT
15A PWR OUTLET 2
1 3
3
2
5
1
2 2B–W
G–B
ST RELAY
2
5A STA
W
( *6)
( *6)
(*6)
1I
3
JUN
CTI
ON
CO
NN
EC
TOR
J 2
(* 6)
B–W
(*6)
C
C
B–W
(*5)
(*5)
B–W
(*5)
B–W
IA49
(*6)
L–R
(*5)
1
3
2
4IA4
8
* 5 : 2UZ–FE* 6 : 5VZ–FE
L–O(*5)
L–O(*5)
L–R
( *5)
L–R
( *6)
ACC CUT RELAYA22
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE
W–RG–Y
(*5) (*5)
2003 TOYOTA TUNDRA (EWD491U)
58
POWER SOURCE
HEATER RELAY5–3 : Closed with ignition SW on and heater blower SW on
H–LP RELAY5–3 : Closed with light control SW at HEAD position or dimmer SW at FLASH position
Closed with engine running and parking brake lever released (w/ daytime running light)
I23 IGNITION SW2–3 : Closed with ignition key at ACC or ON position2–4 : Closed with ignition key at ON or ST position7–6 : Closed with ignition key at ON or ST position
DIMMER RELAY (w/ DAYTIME RUNNING LIGHT)3–5 : Closed with HEAD relay on and dimmer SW at HIGH or FLASH position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A22 34J1
31 (2UZ–FE)J2
31 (2UZ–FE)
I23 35J1
33 (5VZ–FE)J2
33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1I22 (*2)
1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1K26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
59
MEMO
2003 TOYOTA TUNDRA (EWD491U)
60
STARTING (5VZ–FE)
2
2
2
W–R
23
15
M
A1 B1
2 2
2 2
EB13
9
6
N
P
B–Y
W–R
B–Y
B–W
WW
B–W
G–R
B–W
P
W–B
P
P
( A/T
)
( M/T
)
B–W
STRELAY
S 1
STARTER
BA , S 2
B
BATTERY
100A
ALT
40A
AM
1
(M/T)
W–B
( A/T
)
B
8
30A
AM
2
PA
RK
/NE
UTR
AL
PO
SIT
ION
SW
P 1
1
2
C10
CLU
TCH
STA
RT
SW
A A
J 8JUNCTIONCONNECTOR
2
7
4
AM2
AM1
ACC
IG1
IG2
ST2
1
11
2
22
A
W–B
( A/T
)
P
( M/T
)
P
G–B
IGNITION SWI23
(A/T
)
W–B
B–W
(A/T)
P
G–B
IA424
W
C
CC
JUN
CT
ION
CO
NN
EC
TO
R
J 2
I 1
IE219
IE212
C8C3
G–R ( *1) P ( *1)
TVIP ECU
T13 CST SRLY
(*2)
2003 TOYOTA TUNDRA (EWD491U)
61
1I21I3
10AGAUGE
5ASTA
1F71F6
B–Y
P
B–Y
B
( M/T
)
(M/T)
1 7
3 5
P
(M/T)
IE
W–B
W–B
B–Y
CLUTCH STARTCANSEL SW
C 9
–S E
+S IG
I 1
B–W
(A/T)
P
B
W–B
W–B
STA
( M/T
)
NSW
A7
B3
ENGINE CONTROLMODULE
BE 3 , E 4A
I 1
W–B
( M/T
)
W–B
BA
AA
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
* 1 : W/ WIRELESS DOOR LOCK CONTROL* 2 : W/O WIRELESS DOOR LOCK CONTROL
2003 TOYOTA TUNDRA (EWD491U)
62
STARTING (5VZ–FE)
S1 (A), S2 (B) STARTERPoints closed with Park/Neutral position SW at P or N position and ignition SW at ST position (A/T)Points closed with clutch start SW or clutch start cancel SW on and ignition SW at ST position (M/T)
I23 IGNITION SW2–4 : Closed with ignition SW at ON or ST position7–8 : Closed with ignition SW at ST position
P1 PARK/NEUTRAL POSITION SW (A/T)6–9 : Closed with A/T shift lever in P or N position
ST RELAY5–3 : Closed with Park/Neutral position SW at P or N position and ignition SW at ST position (A/T)5–3 : Closed with clutch start SW or clutch start cancel SW on and ignition SW at ST position (M/T)
C9 CLUTCH START CANCEL SW (M/T)1–3 : Closed with ignition SW on and cancel SW on
C10 CLUTCH START SW (M/T)1–2 : Closed with clutch pedal fully depressed
: PARTS LOCATION
Code See Page Code See Page Code See Page
C9 34 J2 33 (5VZ–FE) S1 A 33 (5VZ–FE)
C10 34 J8 35 S2 B 33 (5VZ–FE)
E3 A 34 J23 A 35 T13 C 35
E4 B 34 J24 B 35
I23 35 P1 33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB1 42 (5VZ–FE) Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
63
MEMO
2003 TOYOTA TUNDRA (EWD491U)
64
STARTING (2UZ–FE)
2
30AAM2
30AST3
1
2
2 2
7
8
AM2 IG2
ST2
1I3
5ASTA
1F6
2
5 1
3 2
2
2 2
BATTERY
STRELAY C
C
JUNCTIONCONNECTOR
J 2
EA
J18JUNCTIONCONNECTOR
A
A
P
N
6
9
A1
M
B1
EB13 IA424
IE112
PARK/NEUTRALPOSITION SW
P 1
A A A
JUNCTIONCONNECTOR
J20
I 3
STARTER
BS 1 , S 2A
G–Y W–B
B–W
B
W–B
W–B
P
P
G–R
G–R
B–WB
B–W
W–B
PP
G–R
W–B
P
W–B
W–B
W–B
B
W–R
P
B–L
( *1)
( *2)
B–L
( *4)
( *3)
(* 4) (*3)
(*3)
IGNITION SWI23
2003 TOYOTA TUNDRA (EWD491U)
65
C12
D9 E16 E17
C8
C3
ENGINE CONTROL MODULE
DE 5 , E 6C
TVIP ECU
T13 C
P
G–R
P
W–B
W–B
B
W–B
W–B P
P
G–R
STAR NSW STA
STSW
(*3)
(*3) (*3)
(*3)
SRLY
ST
E, E 7
B
IE115
* 2 : EXCEPT TOWING PACKAGE* 1 : TOWING PACKAGE
* 4 : W/O WIRELESS DOOR LOCK CONTROL* 3 : W/ WIRELESS DOOR LOCK CONTROL
2003 TOYOTA TUNDRA (EWD491U)
66
STARTING (2UZ–FE)
S1 (A), S2 (B) STARTERPoints closed with Park/Neutral position SW at P or N position and ignition SW at ST position
I23 IGNITION SW7–8 : Closed with ignition SW at ST position
P1 PARK/NEUTRAL POSITION SW6–9 : Closed with A/T shift lever in P or N position
ST RELAY5–3 : Closed with Park/Neutral position SW at P or N position and ignition SW at ST position
: PARTS LOCATION
Code See Page Code See Page Code See Page
E5 C 34 J2 31 (2UZ–FE) S1 A 31 (2UZ–FE)
E6 D 34 J18 31 (2UZ–FE) S2 B 31 (2UZ–FE)
E7 E 34 J20 35 T13 C 35
I23 35 P1 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB1 40 (2UZ–FE) Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA 40 (2UZ–FE) Front Left Fender
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
67
MEMO
2003 TOYOTA TUNDRA (EWD491U)
68
IGNITION (2UZ–FE)
B( *
2)
2
30AAM2
2
W–R
7 6AM2 IG2
ST2
B–R
1I4
1J7
B–R
IE121
B–RE 7
B–R
G–R
1 3
1
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 1
I 3
4 2
IGT1
G–R
L–B
BR
B–R
LG–B
1 3
I 4
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 2
4 2
IGT2
LG–B
L–W
BR
B–R
G–B
1 3
I 5
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 3
4 2
IGT3
G–B
L–W
BR
E 7
I 3
E 5E 5E 5
EC
BR
W–R
B–R B–R
L–W
BR
L–B
BRBR
IGNITION SWI23
BATTERY
2
ENGINE CONTROL MODULEE 7
9 8 25B
–R
1
BR
2NO
ISE
FIL
TER
N 1
E 7
B–R
B–L
( *1)
E 7B–R
2003 TOYOTA TUNDRA (EWD491U)
69
B–R B–L
1 3
I 6
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 4
4 2
IGT4
B–L
L–B
BR
B–R
G–W
1 3
I 7
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 5
4 2
IGT5
G–W
L–W
BR
B–R P–L
1 3
I 8
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 6
4 2
IGT6
P–L
L–B
BR
B–R
R–W
1 3
I 9
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 7
4 2
IGT7
R–W
L–B
BR
B–R LG
1 3
I10
IGN
ITE
R A
ND
IGN
ITIO
N C
OIL
NO
. 8
4 2
IGT8
LGL–
W
BR
IGF2 IGF1
E 7
E 5
I 3
E 5
I 3
E 5
I 3
E 5
I 3
I 3
L–W
L–B
B–R
L–B
BR
L–W
BR
L–B
BR
L–W
BR
L–B L–B
BR
L–W
B–R
ENGINE CONTROL MODULEE 7
11 12 26 13 10 23 24
E 7E 7E 7
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE
B–R B–R
2003 TOYOTA TUNDRA (EWD491U)
70
IGNITION (2UZ–FE)
I23 IGNITION SW7–6 : Closed with ignition SW at ON or ST position
: PARTS LOCATION
Code See Page Code See Page Code See Page
E7 34 I6 31 (2UZ–FE) I10 31 (2UZ–FE)
I3 31 (2UZ–FE) I7 31 (2UZ–FE) I23 35
I4 31 (2UZ–FE) I8 31 (2UZ–FE) N1 31 (2UZ–FE)
I5 31 (2UZ–FE) I9 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1J26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E540 (2UZ FE) Engine Wire
I3 46 Engine Wire
E740 (2UZ–FE) Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
71
MEMO
2003 TOYOTA TUNDRA (EWD491U)
72
IGNITION (5VZ–FE)
30AAM2
2
1
2
2
1I4
1J7
IE11
I 3
2
1
I 3I 3
2
1
2
1
2
1
ED
IE15
IGNITION SWI23
B–R
B–R
B–R
B–R B–R
B–R
B–R
B–R
W–GLR
B–R
B–R
B
10 2 1 9 8
IGN
ITIO
N C
OIL
NO
. 1I1
1
IGN
ITIO
N C
OIL
NO
. 2I1
2
IGN
ITIO
N C
OIL
NO
. 3I1
3
NO
ISE
FIL
TE
RN
1
TO C
OM
BIN
AT
ION
ME
TER
3 7 6 5 4
W–B
B–L
R–L LG B–Y
IGNITERI 2
BR
BATTERY
BW
–R
IGT1 IGT2 IGT3 IGF
7 6AM2 IG2
ST2
B
ENGINE CONTROL MODULEE 6
11 10 9 2
2003 TOYOTA TUNDRA (EWD491U)
73
I23 IGNITION SW7–6 : Closed with ignition SW at ON or ST position
: PARTS LOCATION
Code See Page Code See Page Code See Page
E6 34 I12 33 (5VZ–FE) N1 33 (5VZ–FE)
I2 33 (5VZ–FE) I13 33 (5VZ–FE)
I11 33 (5VZ–FE) I23 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1J26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
ED 42 (5VZ–FE) Intake Manifold Left
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
74
CHARGING
5 1E
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
10 1F
5AIGN
C
C
4
3
EB11EB12
IA57
EB14
22
2 B4 B2 B3 A1
* 1 : W/ DAYTIME RUNNING LIGHT* 2 : W/O DAYTIME RUNNING LIGHT
B
W
B–Y W
B W
JUN
CT
ION
CO
NN
EC
TO
R
J 1
Y–G
B–Y
Y–G
Y–G
(*2)
(*1)
Y–G B–Y W B
B–O
B( *
4)
1
1
2
2
CH
AR
GE
WA
RN
ING
LIG
HT
[CO
MB
. M
ETE
R]
C12
7. 5
A A
LT–S
140A
ALT
(*3
)10
0A A
LT (
*4)
BATTERY
L IG B
IC REGULATOR
S
G 1
GENERATOR
BA , G 2
Y–G
(*1)
A
A
A
JUNCTIONCONNECTOR
J11
Y–G ( *1)
TO IN
TE
GR
ATI
ON
RE
LAY
B–L
( *3)
* 3 : TOWING PACKAGE* 4 : EXCEPT TOWING PACKAGE
2003 TOYOTA TUNDRA (EWD491U)
75
G2 (B) GENERATOR(B) 3–GROUND : 13.9–15.1 volts with engine running at 2000 rpm and 25°C (77°F)
13.5–14.3 volts with engine running at 2000 rpm and 115°C (239°F)(B) 1–GROUND : 0–4 volts with ignition SW at ON position and engine not running
: PARTS LOCATION
Code See Page Code See Page Code See Page
C12 34G2 B
30 (2UZ–FE) J1 33 (5VZ–FE)
G1 A30 (2UZ–FE)
G2 B32 (5VZ–FE) J11 35
G1 A32 (5VZ–FE) J1 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB140 (2UZ–FE)
Engine No 2 Wire and Engine Room Main Wire (Under the Engine Room R/B)EB142 (5VZ–FE)
Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
76
ENGINE CONTROL (2UZ–FE)
30AAM2
2
1
2
2
5 1
3 2
2 2
2 2
5 1
3 2
2 2
2 2
15AEFI NO. 1
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
EA
IA426
IGNITION SWI23
B–W
W–R
B–R
B–R
B–Y
B–W
B–R
B–R
B–Y
B
EFI
RE
LAY
C/O
PN
RE
LAY
W–L
B–W
Y
W–B
W–L
BA
TTE
RY
Y
W–L
B
Y
W–B
2
7 6
8
1
1I3
5ASTA
1F6
B
1
2
2
SH
OR
T P
INB
–L
( *1)
( *2)
2
5A E
CU
–B
2
1
2
B
4 1
3 2
AD
BF
IA517IA49
AM2
ACC
IG2
ST2
3
W–R
L–R
W–R
W–R
W–R
L–R
W–R
L–R
( *4)
( *3)
( *3)
JUN
CT
ION
CO
NN
EC
TOR
BJ2
1A
, J2
2
ACC CUTRELAY
A22
IE18
G–Y
JUNCTIONCONNECTOR
J18
A
A
W–B
G–Y
L–O
G–Y
2003 TOYOTA TUNDRA (EWD491U)
77
1 5
2 3
4
2 2
2 2
2
A
IF
J 3JUNCTIONCONNECTOR
IA45
BB13
5
4
BB112
2
1
2
1
10AEFINO. 2
2
2
1
2
7. 5AOBD
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
CG SG SIL
IE125
IA414
B–R
B–Y
B–W
B–RF/
PM
P R
ELA
Y
B–W
L–O
L–O
W–B
A
Y
W–L
B
W–B
L–O
FUE
L P
UM
PR
ES
ISTO
R
F 5
VS
V (
VA
PO
RP
RE
SS
UR
E S
EN
SO
R)
V 9
W–L
R
B A
16
B
4 5 7
BAT
Y
R
W–L R
W–L
L–W
BR
W–B W
EC
L–W
W–L
BR
IE11
R
W–B
FUE
L P
UM
PF1
0
L–O
L–B
B–W
B–L
TC
13
W–G
15
WFSE
L–W
M
1B4
B
JUN
CTI
ON
CO
NN
EC
TOR
J 1
A
AJUN
CTI
ON
CO
NN
EC
TOR
J 8
BF
AG
AH
BH
JUN
CTI
ON
CO
NN
EC
TOR
BJ1
4A
, J1
5
JUN
CT
ION
CO
NN
EC
TO
R
BJ1
4A
, J1
5R
DA
TA L
INK
CO
NN
EC
TO
R 3
D 6
EA18
B–L
B–R
B–Y
B–W
B–L
L–W
B–R
G–Y
W
W–G
L–W
Y
W–L
G–Y
R
B
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DOOR LOCK CONTROL* 4 : W/O DOOR LOCK CONTROL
IA418
R
2003 TOYOTA TUNDRA (EWD491U)
78
ENGINE CONTROL (2UZ–FE)
2
1
INJE
CTO
R N
O.
1I1
4
2
1
INJE
CTO
R N
O.
3I1
6
2
1
INJE
CTO
R N
O.
5I1
8
2
1
INJE
CTO
R N
O.
7I2
0
E 6
E1 E3 E5 C6
R G L
L–R
B–R
B–R
B–R
B–R
#1 #3 #5 #7
B–R
A2
2 4
1 3
HE
ATE
D O
XY
GE
N S
EN
SO
R( B
AN
K 2
SE
NS
OR
1)
H 5
D33 D22A1
I 3
I 5
+B2 +B HT2A OX2A
W–L
W–L
Y–G W
B–WR
R
( *5)
* 5 : SHIELDED
W–L
HTR OX
+B E1
W–B
5AIGN
1F11
1J7
1K6
1I4
A9E33 A8 A3
E16
B
B
A18 27 E A10 C12A20
D
D
D
W–G
J 8
B–Y
B–R
B–Y
B–L
B–R
B–L
B–R
B–R
B–R
B–O
B–O
CCV FCSIL
E 3
ENGINE CONTROL MODULE
BA , E 4 C, E 5 E 6, D
JUN
CTI
ON
CO
NN
EC
TOR
J 5
W–G BY
L–WW
JUN
CTI
ON
CO
NN
EC
TOR
D
STSWTC
FPR MREL BATT IGSW
NSW
B–W
IA415 IA46
A19
L–W
WFSE
IE123
B–W
JUN
CT
ION
CO
NN
EC
TO
R
J 5
L–W
E 7, E
B–Y
B–R
B–R
E15
ACCR
G–Y
IE116
W
W
W–G
L–W
Y
W–L
G–Y
R
B
L–W
IE115
B
E17
STA
PTO
PA
RK
/NE
UTR
AL
PO
SIT
ION
SW
FRO
M P
AR
K/N
EU
TRA
LP
OS
ITIO
N S
W
W–B
D9
STAR
FRO
M P
AR
K/N
EU
TRA
LP
OS
ITIO
N S
W
B–R
B–RIE121
E 6B–R B–R
(*5)
R
B–W
2003 TOYOTA TUNDRA (EWD491U)
79
2
1
INJE
CTO
R N
O.
2I1
5
2
1
INJE
CTO
R N
O.
4I1
7
2
1
INJE
CTO
R N
O.
6I1
9
2
1
INJE
CTO
R N
O.
8I2
1E 6
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 1
I 3
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 2
I 4
IE13
E 7 E 7
E2 E4 D3 C5 E9 E8
W R–B Y
R–W
G–R
LG–B
B–R
B–R
B–R
B–R
B–R L–B
B–R
L–W
1 2 1 2
3 3
#2 #4 #6 #8 IGT1 IGT2
B–R
B–RB–R B–R
B–R
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 3
I 5
1 2
3
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 4
I 6
1 2
3
E25 E11
G–B
IGT3
B–L
IGT4
I 3
I 3
E 7 E 7
L–W
B–R L–B
L–B
L–W
B–R
2 4
1 3
HE
ATE
D O
XY
GE
N S
EN
SO
R( B
AN
K 1
SE
NS
OR
1)
H 3
2 4
1 3
HE
ATE
D O
XY
GE
N S
EN
SO
R( B
AN
K 2
SE
NS
OR
2)
H 6
2 4
1 3
HE
ATE
D O
XY
GE
N S
EN
SO
R( B
AN
K 1
SE
NS
OR
2)
H 4
D4 D23 D25 D21 D5 D29
I 3 I 3 I 3
I 3 I 3 I 3
I 3
I 3
I 3
I 3
EC
C1
HT1A OX1A HT2B OX2B HT1B OX1B E1
G–Y B
Y–B W R–Y B B
RB
RB
R
R
B–W
B–WR
B–WR
R
BR
BR
BR
R R
B–W
R
B–W
BR
Y–B W
BR–Y
I 3
D1 D2
E 4
1 1
KN
OC
KS
EN
SO
R 2
K 2
KN
OC
KS
EN
SO
R 1
K 1
BR
GR
B
GR B
BR
KNK1 KNK2
(*5)
( *5)
( *5)
( *5)
( *5)
( *5)
( *5)
E 8
BR
HTL OX2 HTR2 OXR2 HTL2 OXL2
+B E1 +B E1 +B E1
(*5)
B–R
B–RE 6
B–R
E 3
ENGINE CONTROL MODULE
BA , E 4 C, E 5 E 6, D E 7, E
B–R B–R
L–B
L–W
(*5)
B–WI 3
B–W
EC23 EC22 EC21
B–W
R
BR
2003 TOYOTA TUNDRA (EWD491U)
80
ENGINE CONTROL (2UZ–FE)
GY
E01E02E03ME01NE+G2–G2PRG
R
R
BR
W–B
W–B
, B
Y L R G
W–B
W–B
W–B
W–BL
W–G
A
BR
R R
C 2CRANKSHAFT POSITIONSENSOR
C 1CAMSHAFT POSITIONSENSOR
ENGINE CONTROL MODULE
E 3 A
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 5
I 7
1 2
3
E 4
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 6
I 8
1 2
3
,
IGN
ITE
R A
ND
IG
NIT
ION
CO
IL N
O. 7
I 9
1 2
3IG
NIT
ER
AN
D I
GN
ITIO
NC
OIL
NO
. 8
I10
1 2
3
C
E12 E26 13 E E10
G–W
IGT5
P–L
IGT6
R–W
IGT7
LG
IGT8L–
WIGF2
A
L–B
IGF1
E23 E24
EB
7 E6 EC24
R
NE–
74
E 7
C C C
I 3
25
E 7
2 1
I 3 I 3
A
I 3
B–R
L–W
B–R L–B
B–R L–B
L–W
32
B–R
C27 C
B–R B–R
L–B
L–W
1
L–B
2
L–B
L–W
34 E
I 3
2
1
VS
V( E
VA
P)
V 4
(*5) (*5)
B–R
L–B
L–W
E 7
B–W
JUNCTIONCONNECTOR
J19
B–W
E 5 E, , DE 6 E 7
B–R
I 3B–W
LCK1
G–W
23 C
A/C
LO
CK
SE
NS
OR
A 3
B–W
1
2
2003 TOYOTA TUNDRA (EWD491U)
81
15ATAIL
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G4
15ASTOP
1F2
10AETCS
2
1
2
C
1D4
1D1
B19 A12 B6
2
1
E
E
IA51
A11B17A5B4
4
6
C G–W
L–W
G–O
V–G
G–Y
GG
G–Y
W–G
W–G
L–R
L–W
G–O
V–G
JUNCTIONCONNECTOR
J10
INTEGRATIONRELAY
DIO
DE
( ID
LE–U
P)
D10
B31 B33
21 18
E20 E29 E30
2 4 5
E28
I 3 I 3
1
2
E19
6 4 5
3THROTTLE POSITIONSENSOR
T 2
E21 E31
MA
SS
AIR
FLO
W M
ET
ER
M 1
EN
GIN
E C
OO
LAN
TTE
MP
. S
EN
SO
R
E 2
R
L
L–B
Y–G B–Y
R–W
B–W
G
B–Y
P–L
G–B
B–W
B–W
A/CS ACLD THA E2G VG E2 THWVTA1 VTA2
STP ELS +BM L4 TACH SPD W
TO D
ETE
CT
ION
SW
( TR
AN
SF
ER
L4
PO
SIT
ION
)
STO
P L
IGH
TS
W
S 4
JUNCTIONCONNECTOR
J10
3 1
G–W
G–W
2
B–W
B–W
1
B–WB–W
, B
ENGINE CONTROL MODULE
E 3 A E 4, CE 5 E, , DE 6 E 7
A14
R–B
F/PS
8 DG
R4WD
II11
R–B
1 2
C2 C3
R W
M– M+
17 C
GE01
I 3IA417
1
HP
B
1
2
EA
A/C
PR
ES
SU
RE
SW
A 1
BR
L–W
W–L
W–B
W–B
CC
A
A
JUNCTIONCONNECTOR
J18
W–B
JUN
CT
ION
CO
NN
EC
TO
R
J 2
G–B
B–W
( *5)
* 5 : SHIELDED
B–W
B2
ACMG
19
L–Y
INTEGRATIONCONTROL AND PANEL
I24
TO A
DD
DE
TEC
TIO
NS
W
23 CE
NTE
R A
IRB
AG
SE
NS
OR
AS
SE
MB
LY
C 5
GSW2
A/CS AIND A/CM
2003 TOYOTA TUNDRA (EWD491U)
82
ENGINE CONTROL (2UZ–FE)
G–B
B–W
B–WG–B
R–L
V–G
G–O
L–W
5 4
A28 A
EPA
P–G
V–R
26
3 6
ACCEL PEDAL POSITION SENSORA20
A23 A22 E18 A21
I 3G–B
L
R–G
G–B
VPA2 VPA VC PTNK
2 3 1
BIH B
IE118 IE122
G–B
B–W
R–L
VCPA
1 2
A27 A
VCP2
LG–R
G–R
29
EPA2
E 4
G–BG–B
B–W
AE 3
ENGINE CONTROL MODULE
B , E 7E 5 C DE 6, E, ,
VAPOR PRESSURESENSOR
V 1
BG
AE AD AF
B
B
B
THE
B–L
32 B
2
1
B–W
JUNCTIONCONNECTOR
J 9
R–L
JUN
CTI
ON
CO
NN
EC
TOR
BJ1
4A
, J1
5
B–L
V–G
G–O
L–W
B–L
A/C
TH
ER
MIS
TOR
A13
2003 TOYOTA TUNDRA (EWD491U)
83
JUNCTIONCONNECTOR
1
B–Y
BR
BR
V 2
VE
HIC
LE S
PE
ED
SE
NS
OR
( CO
MB
INA
TIO
N M
ETE
R)
J 8
32
P–L
R–L
BR
BR
R–L
P–L
C13
, A
C
CO
MB
INA
TIO
N M
ETE
R
C11
L–W
G–O
J 9JUNCTIONCONNECTOR
D
DB
–Y
B–Y
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F8
A13 C2 B8 C8
C3 C4 A9
TAC
HO
ME
TE
R
MA
LFU
NC
TIO
NIN
DIC
AT
OR
LA
MP
IE19 IE117
IH
C
C
IE17
1F5
SP
EE
DO
ME
TER
V–G
B–Y
B–Y
G–O
V–G
L–W
2003 TOYOTA TUNDRA (EWD491U)
84
ENGINE CONTROL (2UZ–FE)
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outlineof the engine control is given here.
1. INPUT SIGNALS(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance whichvaries according to the engine coolant temp. The engine coolant temp. is input into TERMINAL THW of the enginecontrol module as a control signal.
(2) Intake air temp. signal circuitThe intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as acontrol signal to TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuitThe oxygen density in the exhaust emission is detected and is input as a control signal from the heated oxygen sensorsto TERMINALS OX1A, OX2A, OX1B, OX2B of the engine control module.
(4) RPM signal circuitThe camshaft position is detected by the camshaft position sensor and is input into TERMINAL G2 of the engine controlmodule as a control signal. Also, the engine RPM is detected by the crankshaft position sensor and the signal is inputinto TERMINAL NE+ of the engine control module.
(5) Throttle position sensor signal circuitThe throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALSVTA1, VTA2 of the engine control module.
(6) Vehicle speed circuitThe vehicle speed sensor (Combination meter) detects the vehicle speed, and the signal is input into TERMINAL SPDof the engine control module via the combination meter.
(7) Battery signal circuitVoltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, thevoltage for engine control module start up power supply is applied through the EFI relay, to TERMINALS +B, +B2 of theengine control module. The current from the IGN fuse flows to TERMINAL IGSW of the engine control module, andvoltage is constantly applied to TERMINAL +BM.
(8) Intake air volume signal circuitThe intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of theengine control module.
(9) Stop light SW signal circuitThe stop light SW is used to detect whether the vehicle is braking or not, and the signal is input into TERMINAL STP ofthe engine control module as a control signal.
(10)Starter signal circuitTo confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking isdetected, and is input into TERMINAL STA of the engine control module as a control signal.
(11) Engine knock signal circuitEngine knocking is detected by the knock sensors, and is input into TERMINALS KNK1, KNK2 of the engine controlmodule as a control signal.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
85
2. CONTROL SYSTEM∗ SFI system
The SFI system monitors the engine condition through the signals input from each sensors to the engine control module.The control signal is sent to the engine control module TERMINALS #1, #2, #3, #4, #5, #6, #7, #8 to operate the injector(Fuel injection). The SFI system controls the fuel injection by the engine control module in response to the drivingconditions.
∗ ESA systemThe ESA system monitors the engine condition through the signals input from each sensors to the engine control module.The best ignition timing is decided according to this data and the data memorized in the engine control module. Thecontrol signal is output to TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8, and these signals control theigniter to provide the best ignition timing.
∗ Heated oxygen sensor heater control systemThe heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temp. of exhaustemission is low), and warms up the heated oxygen sensors to improve their detection performance. The engine controlmodule evaluates the signals from each sensors, and outputs current to TERMINALS HT1A, HT2A, HT1B, HT2B tocontrol the heater.
∗ Fuel pump control systemThe engine control module supplies current to TERMINAL FPR, and controls the operation speed of the fuel pump withthe F/PMP relay.
∗ ETCS–iThe ETCS–i controls the engine output at its optimal level in accordance with the opening of the accelerator pedal, underall driving conditions.
3. DIAGNOSIS SYSTEMWhen there is a malfunction in the engine control module signal system, the malfunctioning system is recorded in thememory. The malfunctioning system can be found by reading the code displayed on the malfunction indicator lamp.
4. FAIL–SAFE SYSTEMWhen a malfunction has occurred in any system, there is a possibility of causing engine trouble due to continued controlbased on that system. In that case, the fail–safe system either controls the system using the data (Standard values)recorded in the engine control module memory, or else stops the engine.
2003 TOYOTA TUNDRA (EWD491U)
86
ENGINE CONTROL (2UZ–FE)
EFI RELAY5–3 : Closed with ignition SW at ON or ST position
C/OPN RELAY5–3 : Closed with starter cranking or engine cranking
E2 ENGINE COOLANT TEMP. SENSOR1–2 : Approx. 16.2 kΩ (–20°C, –4°F)
: Approx. 2.45 kΩ (20°C, 68°F): Approx. 0.32 kΩ (80°C, 176°F)
E3 (A), E4 (B), E5 (C), E6 (D), E7 (E) ENGINE CONTROL MODULEBATT–E1 : Always 9.0–14.0 volts+BM–E1 : Always 9.0–14.0 volts
IGSW–E1 : 9.0–14.0 volts with ignition SW at ON or ST position+B, +B2–E1: 9.0–14.0 volts with ignition SW at ON or ST position
VC–E1 : 4.5–5.5 volts with ignition SW at ON or ST positionVTA2–E1 : 2.0–2.9 volts with ignition SW on and throttle valve fully closed
: 4.7–5.1 volts with ignition SW on and throttle valve fully openVTA1–E1 : 0.4–1.0 volts with ignition SW on and throttle valve fully closed
: 3.2–4.8 volts with ignition SW on and throttle valve fully openVPA–E1 : 0.3–0.9 volts with ignition SW on and throttle valve fully closed
: 3.2–4.8 volts with ignition SW on and throttle valve fully openVPA2–E1 : 1.8–2.7 volts with ignition SW on and throttle valve fully closed
: 4.7–5.1 volts with ignition SW on and throttle valve fully openTHA–E1 : 0.5–3.4 volts with idling, intake air temp. 0°C (32°F) –80°C (176°F)THW–E1 : 0.2–1.0 volts with idling, engine coolant temp. 60°C (140°F) –120°C (248°F)STA–E1 : 6.0 volts or more with engine cranking
W–E1 : 9.0–14.0 volts with idling and malfunction indicator lamp offSPD–E1 : Pulse generation with vehicle movingSTP–E1 : 7.5–14.0 volts with brake pedal depressed
: PARTS LOCATION
Code See Page Code See Page Code See Page
A1 30 (2UZ–FE) H5 30 (2UZ–FE) J5 35
A3 30 (2UZ–FE) H6 30 (2UZ–FE) J8 35
A13 34 I3 31 (2UZ–FE) J9 35
A20 34 I4 31 (2UZ–FE) J10 35
A22 34 I5 31 (2UZ–FE)J14 A
36 (Access Cab)
C1 30 (2UZ–FE) I6 31 (2UZ–FE)J14 A
37 (Standard Cab)
C2 30 (2UZ–FE) I7 31 (2UZ–FE)J15 B
36 (Access Cab)
C5 34 I8 31 (2UZ–FE)J15 B
37 (Standard Cab)
C11 A 34 I9 31 (2UZ–FE) J18 31 (2UZ–FE)
C13 C 34 I10 31 (2UZ–FE) J19 35
D6 34 I14 31 (2UZ–FE) J21 A 35
D10 34 I15 31 (2UZ–FE) J22 B 35
E2 30 (2UZ–FE) I16 31 (2UZ–FE) K1 31 (2UZ–FE)
E3 A 34 I17 31 (2UZ–FE) K2 31 (2UZ–FE)
E4 B 34 I18 31 (2UZ–FE) M1 31 (2UZ–FE)
E5 C 34 I19 31 (2UZ–FE) S4 35
E6 D 34 I20 31 (2UZ–FE) T2 31 (2UZ–FE)
E7 E 34 I21 31 (2UZ–FE)V1
36 (Access Cab)
F5 30 (2UZ–FE) I23 35V1
37 (Standard Cab)
F1036 (Access Cab) I24 35 V2 31 (2UZ–FE)
F1037 (Standard Cab) J1 31 (2UZ–FE) V4 31 (2UZ–FE)
H3 30 (2UZ–FE) J2 31 (2UZ–FE)V9
36 (Access Cab)
H4 30 (2UZ–FE) J3 35V9
37 (Standard Cab)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
87
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1B22 (*2)
1B26 (*1)
1D22 (*2)
1D26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1F26 (*1)
1G22 (*2)
1G26 (*1)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1J26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1 40 (2UZ–FE) Cowl Wire and Engine Room Main Wire (Right Fender)
EC2 40 (2UZ–FE) Engine No.2 Wire and Engine Wire (Near the Starter)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
II1 46 Cowl Wire and Cowl Wire (Instrument Panel Reinforcement RH)
BB148 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
: GROUND POINTS
Code See Page Ground Points Location
EA 40 (2UZ–FE) Front Left Fender
EB 40 (2UZ–FE) Rear Bank of Right Cylinder Head
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
IF 44 Left Kick Panel
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E4 40 (2UZ–FE) Engine No.2 Wire E8 40 (2UZ–FE)Engine Wire
E640 (2UZ FE) Engine Wire
I3 46Engine Wire
E740 (2UZ–FE) Engine Wire
I5 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
88
ENGINE CONTROL (5VZ–FE)
8
2
1
P
N
9
6
IE212
P
( A/T
)
IE219
W–L
W–B
B–R
P
B–R
C10
CLU
TC
H S
TAR
T S
W
P
B–R
W–B
W–B
1 5
2 3
2 2
2 2
2
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
15AEFINO. 1
2
IF
IA45 IA426
W–B
W–B
EA
W–B
( A/T
)
BB112
(A/T)
2
1
30A
AM
2
2
2
BA
TTE
RY
BW
–R
7 6AM2 IG2
ST2
Y
B–Y
A
A
BB13
Y
L–O
A
JUNCTIONCONNECTOR
J 3
I23IGNITION SW
A
1
EF
I RE
LAY
5 1
3 2
2 2
2 2
5
4
C/O
PN
RE
LAY
B–Y
P
( A/T
)
( M/T
)
P
( M/T
)
W–B
W–B
( A/T
)
W–L
L–O
F10
FUE
L P
UM
PL–
O
P
B–R
B–R
P
G–B
A
ST
RE
LAY
5 1
3 2
2 2
2 2
IA424
B–W
6 1F
5ASTA
3 1I
B
W–B
3 5
(A/T)
W–B
W–B
P
B–Y
10AGAUGE
1F7
1 7
( M/T
)
B–Y
CLU
TC
H S
TAR
TC
AN
CE
L S
W
C 9
I 1
B–R
M
( M/T
)( M
/T)
( M/T
)
( M/T
)
B–W
C
CJUN
CT
ION
CO
NN
EC
TOR
J 2
JUN
CT
ION
CO
NN
EC
TO
R
J 8
PA
RK
/NE
UTR
AL
PO
SIT
ION
SW
P 1
I 1
IE
W–B
(A/T)
AA
BA
JUNCTIONCONNECTOR
BJ23 , J24A
W–B
JUN
CTI
ON
CO
NN
EC
TOR
J18
A
A
W–L
Y
B
W–B
B–W
B–W
W
2003 TOYOTA TUNDRA (EWD491U)
89
14 A
5
16
4
13 IE1
14 IA4
W–B
BR
W–B
D 6DATA LINKCONNECTOR 3
7
WY
7. 5AOBD
ED
IE115
SGCG
BAT SIL
B3
D14
1
2
1
2
I 3
D197A1 AA3
W
B–Y
B–R
P(A/T)
B–R
P
VSV(CANISTERCLOSED VALVE)
V 9
I 5
W–L
W–L
W–L
W–L
G–W
L–W
W–L Y B
W–L R
W–L W–L
D
E 4, A B
ENGINE CONTROL MODULE
E 3 E 5, C E 6, D
( A/T
)L–
W
B
B
JUNCTIONCONNECTOR
J 1
STAFC+B CCVEVP1
NSWSIL
4 A
MREL
VS
V( E
VA
P)
V 4
IA415
JUNCTIONCONNECTOR
J 5
D
W–L
WW B–Y
W–L
W–L
W–L
W–B
16 A
BATT
IA46
B–R
B–R
1I4 1J7
1F11
5AIGN
A15
B–O
IGSW
13
W–G
TC
W–G DD W–G
IE120
7 D
TC
W–G
JUNCTIONCONNECTOR
J 8
W–L
B–Y
B
W–B
B
1K6
B–W B–W
15
L–W
WFSE
2
10AEFINO. 2
2
IA418
AH
BE JUN
CTI
ON
CO
NN
EC
TOR
BJ1
4A
, J1
5
AG
BF
IE116
RR
R
L–W
13 A
WFSE
L–W
JUNCTIONCONNECTOR
BJ14 A , J15
B–R
B
BJUN
CT
ION
CO
NN
EC
TO
R
J 5
( *1)
B–O ( *2)
B–O
( *1)
E 7, E
W–L
1B4
FROM POWER SOURCE SYSTEM(SEE PAGE 56) * 1 : W/ CRUISE CONTROL
* 2 : W/O CRUISE CONTROL
B B–O
(*1)
2003 TOYOTA TUNDRA (EWD491U)
90
ENGINE CONTROL (5VZ–FE)
E15
B11 B13 B2
25 E
I 3
I 3
E24
R–Y GR
L–R
( A/T
*3)
( *3)
( A/T
*3)
1
1
3
3
4
2
G–B
B–Y
B–W
B–W
B–W
THROTTLEPOSITIONSENSOR
T 2
VAPORPRESSURESENSOR
V 1
TO
DE
TE
CTI
ON
SW
( TR
AN
SFE
R N
EU
TRA
L P
OS
ITIO
N)
TO
AD
D D
ET
EC
TIO
N S
W
TO
DE
TE
CTI
ON
SW
( TR
AN
SFE
R L
4 P
OS
ITIO
N)
B–W
G–B
G–B
R–L
G–B
G–B
VTA VC PTNK
L44WDTFN
B–R
1
2 2
1
2
1 1
2
D5D6 D4 D3
I 3
E10 E12 E13
MA
SS
AIR
FLO
W M
ET
ER
E11
1
2
E18
EF12
I 3I 3
I 3
I 3 I 3 I 3B–R B–R B–R
R W G R–B
B–R
B–R
B–R
B–R
INJE
CTO
R N
O. 1
I14
INJE
CTO
R N
O. 2
I15
INJE
CTO
R N
O. 3
I16
INJE
CTO
R N
O. 4
I17
M 1
EN
GIN
E C
OO
LAN
TTE
MP
. S
EN
SO
R
E 2
2 3 4
1 5
G–W
R–Y
Y–G
B–W G–Y
G–Y
BR
–BB
–W
B–W
B–W
W–L
W–L
B–W B–W
W–L
W–L
EF11
THWE2THAVGE2G
#40#30#20#10
B–R
B–R
IE13
W–L
W–L
B–R
E 4, A B
ENGINE CONTROL MODULE
E 3 E 5, C E 6, D E 7, E
1
2
1
2IN
JEC
TOR
NO
. 5I1
8
INJE
CTO
R N
O. 6
I19
1 D
L
#50
8 D
Y
#60
I 3
B–R
B–R
R–B
21 A
F/PS
C10 C15
AC
CE
L P
ED
AL
SE
NS
OR
A 8
3 4 1
2
R–W R
VPA2VPA
I 3
C4
R–B
VTA2
2
IE1
19
AD
BI
AE
BH
IE122
R–L
IE126
AF
BG
JUNCTIONCONNECTOR
BJ14 , J15A
JUN
CT
ION
CO
NN
EC
TOR
BJ1
4A
, J1
5
VPA VPA2 VC
E2
B–W
B–W
B–W
R–L
G–B
GSW2
23
CENTER AIRBAGSENSOR ASSEMBLY
C 5
B–O
B–O
(*1)
(*1)
2003 TOYOTA TUNDRA (EWD491U)
91
R
R–W
29 E27 D
A9 A3
B
W–L
EE11 EE13
W–L
1
I 3
E23
B
( SH
IELD
ED
)( S
HIE
LDE
D)
E22
EE12
1
C8 C2 E9 E31
4 3 2 1 1819
THROTTLE CONTROL MOTORT 1
L–B
L–Y
L Y
G R
( SH
IELD
ED
)
BR
BR
GR
GR
W–L
KN
OC
K S
EN
SO
R 2
K 2
42
3 1BR
E10
BD14 BD12
R
R–W
BR
BR
14 IE1
1
KNK1 KNK2
M–M+CL+CL– ACTAC1
OX2B HT2B
D18
Y–R
1
PSW
1F2
20 A
G–W
G–Y
STP
(SH
IELD
ED
)
E 9
I 3
BR
BR
BR
PO
WE
R S
TEE
RIN
GO
IL P
RE
SS
UR
E S
W
P 2
STO
P L
IGH
T S
WS
4
JUNCTIONCONNECTOR
J10
2
C
KN
OC
K S
EN
SO
R 1
K 1
HE
ATE
D O
XY
GE
N S
EN
SO
R( B
AN
K 1
SE
NS
OR
2)
H 9
G–W
G–W
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
+B E1
OX HT
W–L
15ASTOP
* 1 : W/ CRUISE CONTROL
INTEGRATIONCONTROLAND PANEL
I24
BD13BD11
1D4C
1D1
D11 D10 D9 D2
7 6 5 4
IGNITERI 2
B–L
R–L LG B–Y
IGFIGT3IGT2IGT1
E17
GE01
I 3
( SH
IELD
ED
)
( SH
IELD
ED
)
E 4, A B
ENGINE CONTROL MODULE
E 3 E 5, C E 6, D E 7, E
IE125 IE123
I 3
( SH
IELD
ED
)
R
R–W
ED
W–B
W–B
W–BBR
BR
E4
I 3
17 D
BR
E5 E7
E04
8W
–BE
E03E02E01E1
BR
ME01
BR
E6
BR
BR
W–L
BR
BR
CL– CL+ M+ M–
BR
IE124
( SH
IELD
ED
)
4
3
B–O
(*1)
9 B
ST1–
L–R
ACTAC1
* 3 : 4WD
2003 TOYOTA TUNDRA (EWD491U)
92
ENGINE CONTROL (5VZ–FE)
W–L
E 5, C E 6, D E 7,
3 C 9
V
1421 EE
V–G
W–L
BR
BR
V–G
Y
A2
D12 D21
I 3
I 3
D13
I 3
E
A6
A
MA
LFU
NC
TIO
NIN
DIC
ATO
R L
IGH
T
SP
EE
DO
ME
TER
B–Y
BR
G–O
G–OL
Y
GG
R
BR
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F5
B–Y
D
D
42
J 8JUNCTIONCONNECTOR
C
C
IH
1 3
BR
(SH
IELD
ED
)
( SH
IELD
ED
)
( SH
IELD
ED
)
8 1F
8 C13B C 8C2
AIR
FU
EL
RA
TIO
SE
NS
OR
( BA
NK
1 S
EN
SO
R 1
)
A10
V–G
2 3
P–L
G–B
P–L
G–B
IE12B
–YB
–Y
JUN
CTI
ON
CO
NN
EC
TOR
J 9
C11
COMBINATION METER
CA , C13
BR
26
I 3
AF1–
E
P
SP1G2NE–NE+
WAF1+HTAF1
IE225IE34 (M/T)
(A/T)IE23IE36
BR
BR
BR
G–O
+B AF–
HT AF+
1 VE
HIC
LE S
PE
ED
SE
NS
OR
( CO
MB
INA
TIO
N M
ETE
R)
V 2
1
2
1
2
CR
AN
KS
HA
FT P
OS
ITIO
N S
EN
SO
RC
2
CA
MS
HA
FT P
OS
ITIO
N S
EN
SO
RC
1
E 3
ENGINE CONTROL MODULE
BA , E 4
2003 TOYOTA TUNDRA (EWD491U)
93
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outlineof the engine control is given here.
1. INPUT SIGNALS(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance whichvaries according to the engine coolant temp. The engine coolant temp. is input into TERMINAL THW of the enginecontrol module as a control signal.
(2) Intake air temp. signal circuitThe intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as acontrol signal to TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuitThe oxygen density in the exhaust emission is detected and is input as a control signal from the heated oxygen sensorsto TERMINAL OX2B of the engine control module.
(4) RPM signal circuitThe camshaft position is detected by the camshaft position sensor and is input into TERMINAL G2 of the engine controlmodule as a control signal. Also, the engine RPM is detected by the crankshaft position sensor and the signal is inputinto TERMINAL NE+ of the engine control module.
(5) Throttle position sensor signal circuitThe throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALVTA of the engine control module.
(6) Vehicle speed circuitThe vehicle speed sensor (Combination meter) detects the vehicle speed, and the signal is input into TERMINAL SP1 ofthe engine control module via the combination meter.
(7) Battery signal circuitVoltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, thevoltage for engine control module start up power supply is applied through the EFI relay, to TERMINAL +B of the enginecontrol module.
(8) Intake air volume signal circuitThe intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of theengine control module.
(9) Stop light SW signal circuitThe stop light SW is used to detect whether the vehicle is braking or not, and the signal is input into TERMINAL STP ofthe engine control module as a control signal.
(10)Starter signal circuitTo confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking isdetected, and is input into TERMINAL STA of the engine control module as a control signal.
(11) Engine knock signal circuitEngine knocking is detected by the knock sensors, and is input into TERMINALS KNK1, KNK2 of the engine controlmodule as a control signal.
(12)A/C SW signal systemThe operating voltage of the A/C magnetic clutch is detected and input in the form of a control signal to TERMINAL AC1of the engine control module.
(13)4WD signal systemWhether or not the vehicle is operating in 4WD mode is determined, and a control signal is input to TERMINAL 4WD ofthe engine control module.
(14)Air fuel ratio signal systemThe air fuel ratio is detected and input as a control signal into TERMINAL AF1+ of the engine control module.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
94
ENGINE CONTROL (5VZ–FE)
2. CONTROL SYSTEM∗ SFI system
The SFI system monitors the engine condition through the signals input from each sensors to the engine control module.The control signal is sent to the engine control module TERMINALS #10, #20, #30, #40, #50, #60 to operate the injector(Fuel injection). The SFI system controls the fuel injection by the engine control module in response to the drivingconditions.
∗ ESA systemThe ESA system monitors the engine condition through the signals input from each sensors to the engine control module.The best ignition timing is decided according to this data and the data memorized in the engine control module. Thecontrol signal is output to TERMINALS IGT1, IGT2, IGT3 and these signals control the igniter to provide the best ignitiontiming.
∗ Heated oxygen sensor heater control systemThe heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temp. of exhaustemission is low), and warms up the heated oxygen sensors to improve their detection performance. The engine controlmodule evaluates the signals from each sensors, and outputs current to TERMINAL HT2B to control the heater.
3. DIAGNOSIS SYSTEMWhen there is a malfunction in the engine control module signal system, the malfunctioning system is recorded in thememory. The malfunctioning system can be found by reading the code displayed on the malfunction indicator lamp.
4. FAIL–SAFE SYSTEMWhen a malfunction has occurred in any system, there is a possibility of causing engine trouble due to continued controlbased on that system. In that case, the fail–safe system either controls the system using the data (Standard values)recorded in the engine control module memory, or else stops the engine.
EFI RELAY5–3 : Closed with ignition SW at ON or ST position
C/OPN RELAY5–3 : Closed with starter cranking or engine cranking
T2 THROTTLE POSITION SENSOR2–1 : Approx. 2.5–6.0 kΩ
E2 ENGINE COOLANT TEMP. SENSOR1–2 : Approx. 15.0 kΩ (–20°C, –4°F)
Approx. 2.45 kΩ (20°C, 68°F)Approx. 0.32 kΩ (80°C, 176°F)
E3 (A), E4 (B), E5 (C), E6 (D), E7 (E) ENGINE CONTROL MODULEBATT–E1 : Always 9.0–14.0 volts
+B–E1 : 9.0–14.0 volts with ignition SW at ON or ST positionVC–E1 : 4.5–5.5 volts
VTA–E1 : 0.3–1.0 volts with ignition SW on and throttle valve fully closed: 3.2–4.9 volts with ignition SW on and throttle valve fully open
THA–E1 : 0.5–3.4 volts with idling, intake air temp. 0°C (32°F) –80°C (176°F)THW–E1 : 0.2–1.0 volts with idling, engine coolant temp. 60°C (140°F) –120°C (248°F)STA–E1 : 6.0 volts or more with engine cranking
W–E1 : 9.0–14.0 volts with idling and malfunction indicator lamp offSP1–E1 : Pulse generation with vehicle movingSTP–E1 : 7.5–14.0 volts with brake pedal depressed
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
95
: PARTS LOCATION
Code See Page Code See Page Code See Page
A8 32 (5VZ–FE) H9 37 (Standard Cab)J15 B
36 (Access Cab)
A10 32 (5VZ–FE) I2 33 (5VZ–FE)J15 B
37 (Standard Cab)
C1 32 (5VZ–FE) I14 33 (5VZ–FE) J18 33 (5VZ–FE)
C2 32 (5VZ–FE) I15 33 (5VZ–FE) J23 A 35
C5 34 I16 33 (5VZ–FE) J24 B 35
C9 34 I17 33 (5VZ–FE) K1 33 (5VZ–FE)
C10 34 I18 33 (5VZ–FE) K2 33 (5VZ–FE)
C11 A 34 I19 33 (5VZ–FE) M1 33 (5VZ–FE)
C13 C 34 I23 35 P1 33 (5VZ–FE)
D6 34 I24 35 P2 33 (5VZ–FE)
E2 32 (5VZ–FE) J1 33 (5VZ–FE) S4 35
E3 A 34 J2 33 (5VZ–FE) T1 33 (5VZ–FE)
E4 B 34 J3 35 T2 33 (5VZ–FE)
E5 C 34 J5 35V1
36 (Access Cab)
E6 D 34 J8 35V1
37 (Standard Cab)
E7 E 34 J9 35 V2 33 (5VZ–FE)
F1036 (Access Cab) J10 35 V4 33 (5VZ–FE)
F1037 (Standard Cab)
J14 A36 (Access Cab)
V936 (Access Cab)
H9 36 (Access Cab)J14 A
37 (Standard Cab)V9
37 (Standard Cab)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1B22 (*2)
1B26 (*1)
1D22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1D26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1J26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EE1 42 (5VZ–FE) Sensor Wire and Engine Wire (Over the Cylinder Head)
EF1 42 (5VZ–FE) Engine Wire and Sensor Wire (Over the Cylinder Head)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
BB148 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BD148 (Access Cab)
Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)BD150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
96
ENGINE CONTROL (5VZ–FE)
: GROUND POINTS
Code See Page Ground Points Location
EA 42 (5VZ–FE) Front Left Fender
ED 42 (5VZ–FE) Intake Manifold Left
IE44 Left Kick Panel
IF44 Left Kick Panel
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E9 42 (5VZ–FE) Engine Wire I3 46 Engine Wire
E10 42 (5VZ–FE) Sensor Wire I5 46 Cowl Wire
I1 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
97
MEMO
2003 TOYOTA TUNDRA (EWD491U)
98
HEADLIGHT (w/ DAYTIME RUNNING LIGHT)
2
3
1
2
3
1
2
2
1
2
2
1
2 2
3 2
5 1
2 2
2
4 5 2
1
222
OFF
TAIL
HEAD
LOW
HIGH
FLASH
LIG
HT
CO
NTR
OL
SW
DIM
ME
R S
W
8 7
A
IF
J 3JUNCTIONCONNECTOR
16
1 2 1 2
3 3
G–W R–L L
R–W
A
A
5 2
3 1
2 2
2 2
B
B
2
A
A
EA
R
Y–B
G–Y(*6)
GR
R–B
R–B
VGR
Y–B
H–LPRELAY
DIM
ME
R R
ELA
Y
W–B
10A
HE
AD
LL
10A
HE
AD
LH
10A
HE
AD
RL
10A
HE
AD
RH
W–G
W–G
W–G
W–G
W–G
A
B
R–B
JUN
CTI
ON
CO
NN
EC
TOR
J 2
DA
YT
IME
RU
NN
ING
LIG
HT
RE
SIS
TOR
D 2
JUNCTIONCONNECTOR
J 2
W–B
W–B
HEADLIGHTRH
H 2HEADLIGHTLH
H 1
BA
TTE
RY
JUN
CTI
ON
CO
NN
EC
TOR
J18
W–G G
R–B
G
W–G
B–L
( *3)
W–B
I 2W–B
COMBINATIONSW
C15
R–W
W–B
DR
L N
O.
4 R
ELA
Y
2
1
A W–B
B( *
4)
F
F
G–Y(*5)
13
JUN
CTI
ON
CO
NN
EC
TOR
J 7
G–Y
( *6)
G–Y
( *5)
A
2
3
R–B
1J 1J43
1K4
A
W–B
R–WR–W
(*2)(*1)
2003 TOYOTA TUNDRA (EWD491U)
99
1K
5
1C
6
5AECU IG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
15ATAIL
R
Y–B
G–Y(*6)
GR
V
I 2
A
II
J13JUNCTIONCONNECTOR
A
A
IA57
R–G
W–B
Y–G
Y–G
Y–G
Y–G
4
W–B
GENERATORG 2
* 2 : 5VZ–FE* 1 : 2UZ–FE
L
W–B
R
2
1 1
1B6
1E4
2
1
W–B
G–W
W–B
EA
BR
AK
E F
LUID
LE
VE
LW
AR
NIN
G S
W
B 2
R–W
( M/T
)
W–B
( M/T
)
EB12
W–B
W–B
W–B
IA518
G–Y(*5)
FRO
M F
OG
LIG
HT
SW
[CO
MB
. S
W]
INTEGRATIONRELAY
A
AA A7
B16
IE
BA
AA
JUNCTIONCONNECTOR
BJ23 , J24A
HIG
H B
EA
M I
ND
ICA
TOR
LIG
HT
[CO
MB
. M
ETE
R]B
C11
A,
C12
JUNCTIONCONNECTOR
J18
PARKINGBRAKE SW(M/T)
P 5
PARKINGBRAKE SW(A/T)
P 5
R–W
( A/T
)
W–B
JUN
CT
ION
CO
NN
EC
TO
R
J11
IH
C
C
BR
BR
JUNCTIONCONNECTOR
J 8
1J8
R–W
W–B
W–B
R–W
9 6
* 3 : TOWING PACKAGE* 4 : EXCEPT TOWING PACKAGE* 5 : W/ DOOR LOCK CONTROL* 6 : W/O DOOR LOCK CONTROL
G–Y
( *5)
G–W
IA59
1N24 1N21N11O61N15
1O51O41O31N31N81N71N13G
–B
RY–B
G–Y
( *6)
GRV
8
2003 TOYOTA TUNDRA (EWD491U)
100
HEADLIGHT (w/ DAYTIME RUNNING LIGHT)
When the following conditions are met while the ignition SW is ON, and if the light control SW is at OFF or TAIL position, thedaytime running light is controlled.∗ Parking brake lever is released (Parking brake SW is OFF)∗ Input signal from the generatorIf any of the following conditions are met, the daytime running light control is canceled.∗ Ignition SW is turned OFF.∗ Light control SW is at HEAD position.
H–LP RELAY5–3 : Closed with light control SW at HEAD position or dimmer SW at FLASH position
Closed with engine running and parking brake lever released
DIMMER RELAY3–5 : Closed with HEAD relay on and dimmer SW at HIGH or FLASH position
: PARTS LOCATION
Code See Page Code See Page Code See Page
B230 (2UZ–FE)
H130 (2UZ–FE) J11 35
B232 (5VZ–FE)
H132 (5VZ–FE) J13 35
C11 A 34H2
30 (2UZ–FE)J18
31 (2UZ–FE)
C12 B 34H2
32 (5VZ–FE)J18
33 (5VZ–FE)
C15 34J2
31 (2UZ–FE) J23 A 35
D230 (2UZ–FE)
J233 (5VZ–FE) J24 B 35
D232 (5VZ–FE) J3 35 P5 35
G230 (2UZ–FE) J7 35
G232 (5VZ–FE) J8 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1B26 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1C26 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E 26 (*1) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1J 26 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K 26 (*1) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1N27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1O27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB140 (2UZ–FE)
Engine No 2 Wire and Engine Room Main Wire (Under the Engine Room R/B)EB142 (5VZ–FE)
Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
101
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IE44 Left Kick Panel
IF44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
102
HEADLIGHT (w/o DAYTIME RUNNING LIGHT)
10AHEAD LH
2
10AHEAD RH
2
2 1
3
2 1
3
A
A BBA
2
2 3
1 5
2 2
1K5
1C6
OFF
TAIL
HEAD
LOW
HIGH
FLASH
LIG
HT
CO
NTR
OL
SW
DIM
ME
R S
W
1C7
A
1K4
1J3
1J
4
B
A
A
II
J13JUNCTIONCONNECTOR
I 2
16
W–B
W–B
W–B
W–B
R–G
13 8 7 17COMBINATION SWC15
JUNCTIONCONNECTOR
J11
RG
–Y
R R–Y
R–G
R–G
R–Y
R–Y
R–Y
R–G
R
BA
TTE
RY
R–Y
R–G
R–G
R–Y
R–WR–L
R–B
R–BR
B–L
( *1)
HEADLIGHTRH
H 2HEADLIGHTLH
H 1
JUNCTIONCONNECTOR
J 2
1 1
3 2
2
H–LPRELAY
INTE
GR
AT
ION
RE
LAY
JUNCTIONCONNECTOR
J 3
IF
A
1L6
1L5
B( *
2) IA59
B16
A7
HIGH BEAMINDICATOR LIGHT[COMB. METER]
BC11 , C12A
BA
AA
IE
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
F
F
( *4)JUNCTION
CONNECTOR
J 7
G–Y
(*3)
G–Y
(*3)
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DOOR LOCK CONTROL* 4 : W/O DOOR LOCK CONTROL
2003 TOYOTA TUNDRA (EWD491U)
103
H–LP RELAY5–3 : Closed with light control SW at HEAD position or dimmer SW at FLASH position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34H2
30 (2UZ–FE) J7 35
C12 B 34H2
32 (5VZ–FE) J11 35
C15 34J2
31 (2UZ–FE) J13 35
H130 (2UZ–FE)
J233 (5VZ–FE) J23 A 35
H132 (5VZ–FE) J3 35 J24 B 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C22 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K 22 (*2) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE44 Left Kick Panel
IF44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
104
FOG LIGHT (w/ DAYTIME RUNNING LIGHT)
20AFOG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
2
10AHEAD LL
3
1
2
2
2
2
1
1 5
2 3
2 2
2 2
GG
–WL–R
EA
D
D
2
1
2
1
A
A
FRO
NT
FOG
LIG
HT
LHF 1
FRO
NT
FOG
LIG
HT
RH
F 2
P
P
W–B
W–B
P
W–B
W–B
D
A
JUNCTIONCONNECTOR
J 2
2
2 3
1 5
22
1K5
1C6
OFF
TAIL
HEADLIG
HT
CO
NTR
OL
SW
A
IF
J 3JUNCTIONCONNECTOR
F
F
11
10
16
R–B
R R–B
BA
TTE
RY
13
G–B
R–Y
W–B
P
COMBINATION SWC15
FOG LIGHT SW[COMB. SW]
C15
JUNCTIONCONNECTOR
J 7
FOGRELAY
R
JUNCTIONCONNECTOR
J18
5 42
3
DIMMERRELAYH–LP
RELAY
IA58R–Y
A
II
J13JUNCTIONCONNECTOR
W–B
I 2
W–B
INTEGRATIONRELAY
G–Y
( *4)
G–Y
( *3)
G–Y
( *3)
2
1
R–B
B–L
( *1)
B ( *2)
B
(*2)B–L
(*1)
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DOOR LOCK CONTROL* 4 : W/O DOOR LOCK CONTROL
1O4
1O51N3
2003 TOYOTA TUNDRA (EWD491U)
105
FOG RELAY3–5 : Closed with light control SW at HEAD position, dimmer SW at LOW position and fog light SW at ON position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C15 34 F2 32 (5VZ–FE) J7 35
F130 (2UZ–FE)
J231 (2UZ–FE) J13 35
F132 (5VZ–FE)
J233 (5VZ–FE)
J1831 (2UZ–FE)
F2 30 (2UZ–FE) J3 35J18
33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C 26 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K 26 (*1) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1N27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1O27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
106
FOG LIGHT (w/o DAYTIME RUNNING LIGHT)
10AHEAD LH
2
H 2
R–W
10AHEAD RH
2
2 1
3
2 1
3
2
R–L
2 3
1 5
2 2
1K5
1C6
OFF
TAIL
HEAD
LOW
HIGH
FLASH
LIG
HT
CO
NTR
OL
SW
DIM
ME
R S
W
1C7
13 8 7COMBINATION SWC15
RG
–Y
R R–Y
R
HEADLIGHTLH
H 1
BA
TTE
RY
R–Y
HEADLIGHTRH
R
20AFOG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
1
2
FO
G R
ELA
Y
22
32
51
2
D
D
2
1
2
1
A
EA
JUNCTIONCONNECTOR
J18
AA
A
W–B
W–B
W–B
P P
W–B
D
JUNCTIONCONNECTOR
J 2
W–B P
L–R
R–G
R–G
A
A
3 2
1 1
A R–Y
G–R
R–Y
A
10
11
A
IF
J 3JUNCTIONCONNECTOR
16
W–B
G–R
R–Y
R–Y
G–R
R–Y
R–B
2
FOG LIGHT SW[COMB. SW]
C15
AA
J11JUNCTIONCONNECTOR
JUNCTIONCONNECTOR
J 2
2
H–LPRELAY
INTE
GR
AT
ION
RE
LAY
FRO
NT
FOG
LIG
HT
LHF
1
FRO
NT
FOG
LIG
HT
RH
F 2
A
II
J13JUNCTIONCONNECTOR
I 2
W–B
W–B
1L6
1L5
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DOOR LOCK CONTROL* 4 : W/O DOOR LOCK CONTROL
B–L
( *1) B ( *2)
IA59 IA58
F
F
( *4)
JUN
CTI
ON
CO
NN
EC
TOR
J 7
G–Y
(*3)
G–Y
(*3)
2003 TOYOTA TUNDRA (EWD491U)
107
FOG RELAY3–5 : Closed with light control SW at HEAD position, dimmer SW at LOW position and fog light SW at ON position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C15 34 H1 32 (5VZ–FE) J7 35
F130 (2UZ–FE)
H230 (2UZ–FE) J11 35
F132 (5VZ–FE)
H232 (5VZ–FE) J13 35
F230 (2UZ–FE)
J231 (2UZ–FE)
J1831 (2UZ–FE)
F232 (5VZ–FE)
J233 (5VZ–FE)
J1833 (5VZ–FE)
H1 30 (2UZ–FE) J3 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C 22 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K 22 (*2) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
108
BACK–UP LIGHT
* 2 : 5VZ–FE* 3 : 5VZ–FE A/T
* 5 : W/O DOOR LOCK CONTROL
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F7
15AACC
1G111F8 1F9
E
E A
A3
1
2
3 2
5 1
C C
IE14IE12
(*3)(M/T)
B2
A3
A2
B1
IE112IE215 (*3)
(M/T)(A/T)(M/T)
L–B(*3)R–B(*1)
R–B(*2)
B 1
BACK–UP LIGHTSW (M/T)
B
P 1
BACK–UP LIGHT SW[PARK/NEUTRAL POSITION SW](A/T)
A
B–Y
B–Y
B–Y GR
( A/T
)
( M/T
)
( A/T
)
( *4)
GR
GR(*4)
B–Y(A/T)
B–Y
(*5)
DIODE (A/T)D 8
JUNCTIONCONNECTOR
J 8
(M/T)
R–B R–B
B–Y
R–B
W–B
R–B
R–B
(A/T) (*1)
(A/T)
( A/T
)( A
/T)
( A/T
)
( M/T
)
JUNCTIONCONNECTOR
J12
BACK–UPLIGHTRELAY
B 3
3
5
3
5
B10 B10
IE
I 1
BACK–UP LIGHT RH[REAR COMB. LIGHT RH]
R 5BACK–UP LIGHT LH[REAR COMB. LIGHT LH]
R 4
W–B
R–B
R–B
W–B
W–B
W–B
W–B W–B
IE1
2
R–B
( *3)
IE126
B–Y(M/T)
L–B(*1)
W–B
L–B(*3)
L–B(*1)
* 1 : 2UZ–FE
* 4 : W/ DOOR LOCK CONTROL
JUNCTIONCONNECTOR
J 9
BL
TO TRAILER SOCKET
Y
B10B10
BB17
R–B
R–B
BB2
3
BA
AAJUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
W–B
2003 TOYOTA TUNDRA (EWD491U)
109
P1 (A) BACK–UP LIGHT SW [PARK/NEUTRAL POSITION SW] (A/T),B1 (B) BACK–UP LIGHT SW (M/T)(A) 3–(A) 2, (B) 2–(B) 1 : Closed with shift lever in R position
B3 BACK–UP LIGHT RELAY (A/T)5–3 : Closed with shift level in R position and ignition SW at ON position
: PARTS LOCATION
Code See Page Code See Page Code See Page
B1 B 32 (5VZ–FE) J12 35R4
36 (Access Cab)
B3 34 J23 A 35R4
37 (Standard Cab)
D8 34 J24 B 35R5
36 (Access Cab)
J8 35P1 A
31 (2UZ–FE)R5
37 (Standard Cab)
J9 35P1 A
33 (5VZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE146 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE246 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
BB148 (Access Cab)
BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB248 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB250 (Standard Cab)
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire B10 50 (Standard Cab) Frame Wire
B10 48 (Access Cab) Frame Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
110
TAILLIGHT
1K2
1
2
2
1J8
1E2 1H3
6 8 4
BB12
OFF
TAIL
HEAD
A
A
3
2
3
2
2
1
2
1
TAIL
LIG
HT
LH
[RE
AR
CO
MB
. LI
GH
T LH
]
R 4
TAIL
LIG
HT
RH
[RE
AR
CO
MB
. LI
GH
T R
H]
R 5
15A
TA
IL50
A J
/B
LIC
EN
SE
PLA
TE L
IGH
T R
HL
2
B10 B10 B10
B10 B10 B10
A
IF EA
BA
AA
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
B–L
( *1)
GGGGGG
J23
JUNCTIONCONNECTOR
BA , J24
JUNCTIONCONNECTOR
J 3
LIGHT CONTROLSW [COMB. SW]
C15
BA
TTE
RY
W–B
G G
W–B W–B
JUNCTIONCONNECTOR
J 1
16
14
GG
G
R–B
W–G
W–B
A
2
1
PA
RK
ING
LIG
HT
LH
[FR
ON
T T
UR
N S
IGN
AL
LIG
HT
LH
]
F 3
LIC
EN
SE
PLA
TE L
IGH
T LH
L 1
2
1
PA
RK
ING
LIG
HT
RH
[FR
ON
T T
UR
N S
IGN
AL
LIG
HT
RH
]
F 4
A
W–B
BL
AC
BA
R–B
JUNCTIONCONNECTOR
BJ21 , J22A
2
1
B ( *2)
INTEGRATION RELAY
A
AA
JUNCTIONCONNECTOR
J18
W–B
IE
BB23
W–B
I 2
140A
ALT
(*1
)10
0A A
LT (
*2)
II
A
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DAYTIME RUNNING LIGHT* 4 : W/O DAYTIME RUNNING LIGHT
2
JUN
CTI
ON
CO
NN
EC
TOR
J13
W–B
1L1N
134 (*3)
(*4)
2003 TOYOTA TUNDRA (EWD491U)
111
C15 LIGHT CONTROL SW [COMB. SW]14–16 : Closed with light control SW at TAIL or HEAD position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C15 34 J13 35 L1 37 (Standard Cab)
F330 (2UZ–FE)
J1831 (2UZ–FE)
L236 (Access Cab)
F332 (5VZ–FE)
J1833 (5VZ–FE)
L237 (Standard Cab)
F430 (2UZ–FE) J21 A 35
R436 (Access Cab)
F432 (5VZ–FE) J22 B 35
R437 (Standard Cab)
J131 (2UZ–FE) J23 A 35
R536 (Access Cab)
J133 (5VZ–FE) J24 B 35
R537 (Standard Cab)
J3 35 L1 36 (Access Cab)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1H22 (*2)
1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J26 (*1)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2)Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
BB148 (Access Cab)
BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB248 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB250 (Standard Cab)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IE44 Left Kick Panel
IF44 Left Kick Panel
II 44 Right Kick Panel
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire B10 50 (Standard Cab) Frame Wire
B10 48 (Access Cab) Frame Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
112
ILLUMINATION
15A
TA
IL
1K2 1J8
1G4
6 8 4
E
E
OFF
TAIL
HEAD
50AJ/B
1
2
2
A
IF
E
14
15
4
1A7
B8B1 B7
E E
1
2 3
16
14
E
E E E
E
W–G
W–B
GG G G G
G
W–B
W–G
W–G
BR
W–G
( 2U
Z–FE
)
ME
TER
ILL
UM
INA
TIO
N[C
OM
B.
ME
TE
R]
C12
STE
ER
ING
SW
[CO
MB
. S
W]
C16
A
G–W
I24
INTEGRATION CONTROLAND PANEL
BA , I25
G
ELS
DIODE(IDLE–UP)
D10
G–Y
(2UZ–FE)
JUNCTION CONNECTORJ10
21
JUNCTION CONNECTORJ 5
A
BA
TTE
RY
LIG
HT
CO
NT
RO
L S
W[C
OM
B.
SW
]
C15
RHEOSTATR 3
W–B
II
W–B
W–B
ILL+
ILL–GND IL–1
JUNCTIONCONNECTOR
J13
W–B
W–B
W–B
I 2
A
W–B
W–B
T
E L
INTEGRATION RELAY
12
ENGINE CONTROLMODULE
E 3
AC
BA JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
R–B
JUN
CTI
ON
CO
NN
EC
TOR
J 3
EDEC
BR
( 2U
Z–FE
)
BR
( 5V
Z–FE
)
IE15IE117
(2UZ–FE)(5VZ–FE)
BR
W–B
2
1
2
140A
ALT
(*1
)10
0A A
LT (
*2)
B ( *2)
B–L
( *1)
R–B
1L1N
134 (*3)
(*4)
2003 TOYOTA TUNDRA (EWD491U)
113
E
E
ID25
ID24
GG
W–G
W–G
ID26
ID23
GG
W–G
W–G
E E
EE
R 1
RA
DIO
AN
D P
LAY
ER
BA
, R
2
CIG
AR
ET
TE L
IGH
TER
ILLU
MIN
AT
ION
C 8
AS
HTR
AY
ILLU
MIN
AT
ION
A18
GLO
VE
BO
XLI
GH
T
G 3
GW
–B
G–W
JUNCTION CONNECTORJ 5
JUNCTION CONNECTORJ12
G
2A5
B102 2 1
1 1
G–W
W–BI 1
BA
AA
IE
W–B
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
GW
–GM
IRR
OR
HE
ATE
R S
WM
4
2
1
E E
E
E
TO OPTIONCONNECTOR
G
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE* 3 : W/ DAYTIME RUNNING LIGHT* 4 : W/O DAYTIME RUNNING LIGHT
G
W–B
2003 TOYOTA TUNDRA (EWD491U)
114
ILLUMINATION
C15 LIGHT CONTROL SW [COMB. SW]14–16 : Closed with light control SW at TAIL or HEAD position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A18 34 I24 A 35 J22 B 35
C8 34 I25 B 35 J23 A 35
C12 34 J3 35 J24 B 35
C15 34 J5 35 M4 35
C16 34 J10 35 R1 A 35
D10 34 J12 35 R2 B 35
E3 34 J13 35 R3 35
G3 35 J21 A 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1G22 (*2)
1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J26 (*1)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2)Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
ID2 46 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
ED 42 (5VZ–FE) Intake Manifold Left
IE44 Left Kick Panel
IF44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire I2 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
115
MEMO
2003 TOYOTA TUNDRA (EWD491U)
116
INTERIOR LIGHT
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F5
10ADOME
2
1E6 1A3
1F3
B5A9 B9 B6
2 1
B13 B7
IF49IF11
IB49IB21
2
1
2
1
IF14IF48
IB24IB48
L–B R
L–Y
L–Y
L–Y
L–Y
L–Y
W–L
W–L
E
E
DO
OR
CO
UR
TES
YLI
GH
T R
H
D15
DO
OR
CO
UR
TES
YLI
GH
T LH
D14
(* 3)(*4)
C
BE25
BG24
1
1
2
1
2
CC C
E E
E
JUNCTIONCONNECTOR
J 4
JUNCTIONCONNECTOR
J 9
B–Y
L–Y
LL L L L
L–Y
W–L
LL
DIO
DE
( DO
OR
CO
UR
TE
SY
)
D 9
DO
OR
CO
UR
TE
SY
SW
FR
ON
T L
H
D16
W–L
W–L
W–L
W–L
W–L
IGNITION KEYCYLINDER LIGHT
I22
(*3)(*4)
DO
OR
( *2)
( *2)
( *2)
( *1)
L ( *1)
C
STE
P L
IGH
TS
3
B
1
2
C11
COMBINATION METER
BA , C12
L–Y
DIO
DE
( STE
P L
IGH
T)
D27 1
2
1F4
AB
BC
AB AB
JUNCTIONCONNECTOR
BJ23 , J24A
L–Y
L–Y
L–Y
2003 TOYOTA TUNDRA (EWD491U)
117
B 8
2
1
2
1
BJ
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TE
SY
SW
RE
AR
LH
UP
PE
R
D19
DO
OR
CO
UR
TE
SY
SW
RE
AR
LH
LO
WE
R
D18
B 4 B 4 B 4
B 4
1A2
1J8
2
1
2
1
1
2
OFF
ON
DO
OR
3
1
B 4
1H1
1B8 1B9
C
L–Y L–Y L–Y
L–Y
L–Y
L–Y
L–Y
W–B
W–B
B–W
W–B
B–W
A
IF
J 3JUNCTIONCONNECTOR
BK
2
1
2
1
B 9 B 9
BF25
BH14
C
1 2
B–W
B–LW–L
W–B
B–W
B–W
B–W
B–W
B–W
B–W
B–W
W–B
B–W
W–B
VA
NIT
Y L
IGH
T LH
V 6
VA
NIT
Y L
IGH
T R
HV
7
INTE
RIO
R L
IGH
TI2
6
PE
RS
ON
AL
LIG
HT
P 8
W–L
( *3)
( *3)
DIODE(POWER WINDOW SYSTEM)
D11
B–W( *2)
( *1)
( *2)
( *2)
( *2)
( *2)
( *2)
( *1)
(* 2)
( *2)
(* 2)
W–B
DO
OR
CO
UR
TES
Y S
WR
EA
R R
H U
PP
ER
D21
DO
OR
CO
UR
TES
Y S
WR
EA
R R
H L
OW
ER
D20
DO
OR
CO
UR
TES
YS
W F
RO
NT
RH
D17
(*2)
( *2)
( *2)
( *2)
W–B
* 2 : ACCESS CAB* 1 : STANDARD CAB
* 4 : W/O DOOR LOCK CONTROL* 3 : W/ DOOR LOCK CONTROL
1
B 4W–BW–B
B–W
2
B–W ( *4)
CJUNCTION CONNECTORJ 5
DOOR
BF24
BG25
C
B–W ( *2)
B–W ( *2)
B–W ( *2)
IC12
B
2
1
B
B
B
JUNCTIONCONNECTOR
J 4
JUNCTIONCONNECTOR
J21
B–W
(*3)
B
(*3)
B–W ( *3)
B ( *3)
B–W ( *4)
DIO
DE
( TV
IP)
D29
2003 TOYOTA TUNDRA (EWD491U)
118
INTERIOR LIGHT
C11 (A), C12 (B) COMBINATION METER(A) 9–GROUND : Approx. 12 volts with ignition SW at ON or ST position(B) 5–GROUND : Always approx. 12 volts(B) 7–GROUND : Continuity with each door open(B)13–GROUND : Continuity with front LH door open
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34 D17 37 (Standard Cab) J4 35
C12 B 34 D18 36 (Access Cab) J5 35
D9 34 D19 36 (Access Cab) J9 35
D11 34 D20 36 (Access Cab) J21 35
D1436 (Access Cab) D21 36 (Access Cab) J23 A 35
D1437 (Standard Cab) D27 34 J24 B 35
D1536 (Access Cab) D29 34
P836 (Access Cab)
D1537 (Standard Cab) I22 35
P837 (Standard Cab)
D1636 (Access Cab)
I2636 (Access Cab) S3 35
D1637 (Standard Cab)
I2637 (Standard Cab) V6 36 (Access Cab)
D17 36 (Access Cab) J3 35 V7 36 (Access Cab)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1B22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1B26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB244 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IC1 44 Cowl Wire and Roof Wire (Left Side of Instrument Panel)
IF146 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF446 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
119
: GROUND POINTS
Code See Page Ground Points Location
IF 44 Left Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B448 (Access Cab)
Roof WireB8 48 (Access Cab) Rear Door No.1 Wire LH
B450 (Standard Cab)
Roof WireB9 48 (Access Cab) Rear Door No.1 Wire RH
2003 TOYOTA TUNDRA (EWD491U)
120
TURN SIGNAL AND HAZARD WARNING LIGHT
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
5ATURN
1J5
LH
RHTURN
1D7 1D10
1H12 1H131E11
BA BB
AC A
3
1
2
3
3
1
2
3
1D51E7 1D11
A7
B1 C12
B10I 2
EA IF
A A
4 1 6 5
1 3
17 8 3 2 7
2
G
G–B
G–R
TURN SIGNAL SW[COMB. SW]
C15
L–W
R–B
W–B
W–B
G–Y
G–B
G–B
G–Y
G–Y
G–B
G–Y
G–B
G–B
G–Y
FRO
NT
TUR
N S
IGN
AL
LIG
HT
LH
F 3
C11
TURN SIGNALINDICATOR LIGHT[COMB. METER]
BA , C12RE
AR
TU
RN
SIG
NA
LLI
GH
T LH
[RE
AR
CO
MB
. L
IGH
T L
H]
R 4
LH RH
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
JUN
CTI
ON
CO
NN
EC
TOR
J13
B1
II
INTEGRATIONCONTROL ANDPANEL
I24
R 5
RE
AR
TU
RN
SIG
NA
LLI
GH
T R
H[R
EA
R C
OM
B.
LIG
HT
RH
]
TURN SIGNALFLASHER
T 5
FRO
NT
TUR
N S
IGN
AL
LIG
HT
RH
F 4
+B IG ER EL
EHW LL LR GND
B10
BL
W–B
W–B
1
2
IA422
L–W
B
C13 C
I 1 BA
AA
AA
JUN
CTI
ON
CO
NN
EC
TOR
J 3
IE
W–B
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
A
AA
JUNCTIONCONNECTOR
J18
BB23
W–B
JUN
CTI
ON
CO
NN
EC
TOR
BJ1
4A
, J1
5
1D91D6
TO T
OW
ING
CO
NV
ER
TER
G–B
G–Y
20AHAZ
2003 TOYOTA TUNDRA (EWD491U)
121
T5 TURN SIGNAL FLASHER4–GROUND : Always approx. 12 volts1–GROUND : Approx. 12 volts with ignition SW at ON or ST position7–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34 I24 35 J18 33 (5VZ–FE)
C12 B 34 J3 35 J23 A 35
C13 C 34 J13 35 J24 B 35
C15 34J14 A
36 (Access Cab)R4
36 (Access Cab)
F330 (2UZ–FE)
J14 A37 (Standard Cab)
R437 (Standard Cab)
F332 (5VZ–FE)
J15 B36 (Access Cab)
R536 (Access Cab)
F430 (2UZ–FE)
J15 B37 (Standard Cab)
R537 (Standard Cab)
F432 (5VZ–FE) J18 31 (2UZ–FE) T5 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1D26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1H22 (*2)
1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
BB248 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)BB250 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IE44 Left Kick Panel
IF44 Left Kick Panel
II 44 Right Kick Panel
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I146 Cowl Wire B10
48 (Access Cab)Frame Wire
I246 Cowl Wire B10
50 (Standard Cab)Frame Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
122
STOP LIGHT
15ASTOP
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F2
G–Y
G–W
1D4
1H5
BC
3
4
3
4
AA
BC
B10
A
IF
J 3JUNCTIONCONNECTOR
2
1
1A2
1J8
IC11
1D3
W–B
W–B
W–B
W–B
G–W
G–W
G–W
G–W
G–W
W–B
STO
P L
IGH
T LH
[RE
AR
CO
MB
. L
IGH
T LH
]
R 4
STO
P L
IGH
T R
H[R
EA
R C
OM
B.
LIG
HT
RH
]
R 5
J14
JUNCTIONCONNECTOR
BA , J15
HIG
H M
OU
NTE
DS
TOP
LIG
HT
H10
JUNCTIONCONNECTOR
J10
2
1
STOP LIGHTSW
S 4
BL
C
C
G–W
W–B
2003 TOYOTA TUNDRA (EWD491U)
123
S4 STOP LIGHT SW2–1 : Closed with brake pedal depressed
: PARTS LOCATION
Code See Page Code See Page Code See Page
H1036 (Access Cab) J14 A 37 (Standard Cab)
R536 (Access Cab)
H1037 (Standard Cab)
J15 B36 (Access Cab)
R537 (Standard Cab)
J3 35J15 B
37 (Standard Cab) S4 35
J10 35R4
36 (Access Cab)
J14 A 36 (Access Cab)R4
37 (Standard Cab)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1D22 (*2)
1D26 (*1)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1H26 (*1)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IC1 44 Cowl Wire and Roof Wire (Left Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
IF 44 Left Kick Panel
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B10 48 (Access Cab) Frame Wire B10 50 (Standard Cab) Frame Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
124
LIGHT AUTO TURN OFF (w/ DAYTIME RUNNING LIGHT)
5AECU IG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
15ATAIL
OFF
TAIL
HEAD
E
E
1C6
1K5
1
3 2
2 2
2
5
A
IF
J 3JUNCTIONCONNECTOR
BE25
BG24
1
14 6
R–B
L
E
13 14
R–B
R
H–L
P R
ELA
Y
BATTERY
B–L
LIG
HT
CO
NT
RO
L S
W[C
OM
B.
SW
]
C15
16
W–B
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
L
L
L
L
JUN
CTI
ON
CO
NN
EC
TOR
J 4
R
( *3)
( *4)
( *4)
(* 4)
1H7
G–Y
* 4 : ACCESS CAB* 3 : STANDARD CAB
9
* 2 : EXCEPT TOWING PACKAGE* 1 : TOWING PACKAGE
A
II
J13JUNCTIONCONNECTOR
I 2
W–B
W–B
1J8
8
W–B
A
30APOWER
3 2
1
INTEGRATION RELAY
F
F
G–Y
( *5)
G–Y
( *5)
( *6)
AC
BA
R–B
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
JUN
CTI
ON
CO
NN
EC
TOR
J 7
* 5 : W/ DOOR LOCK CONTROL* 6 : W/O DOOR LOCK CONTROL
R–B
B ( *2)
( *1)
W–B
1O4 1N3 1N4
2003 TOYOTA TUNDRA (EWD491U)
125
With the ignition SW turned on, the current flows to TERMINAL 9 of the integration relay through ECU IG fuse.Voltage is applied at all times to TERMINAL 6 of the integration relay through the TAIL fuse, and through the H–LP relay coilside.
1. NORMAL LIGHTING OPERATION<Turn taillight on>With the light control SW turned to TAIL position, a signal is input into the integration relay. Due to this signal, the currentflowing to TERMINAL 6 of the relay flows to TERMINAL 14 of the light control SW to TERMINAL 16 to GROUND, andtaillights to turn on.
<Turn headlight on>With the light control SW turned to HEAD position, a signal is input into the integration relay. Due to this signal, the currentflowing to the relay flows to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND in the headlight circuit, andcauses taillight and H–LP relay to turn the lights on. The taillight circuit is same as above.
2. LIGHT AUTO TURN OFF OPERATIONWith light on and ignition SW turned off (Input signal goes to TERMINAL 9 of the relay), when the driver’s door is opened(Input signal goes to TERMINAL 14 of the relay), the relay operates and the current is cut off which flows from TERMINAL 6and through the H–LP relay coil side of the relay to taillight circuit and headlight circuit.As a result, all lights are turned off automatically.
H–LP RELAY5–3 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
Closed with the engine running and the parking brake lever released
C15 LIGHT CONTROL SW [COMB. SW]13–16 : Closed with light control SW at HEAD position14–16 : Closed with light control SW at TAIL or HEAD position
D16 DOOR COURTESY SW FRONT LH1–GROUND : Continuity with the front LH door open
INTEGRATION RELAY9–GROUND : Approx. 12 volts with the ignition SW at ON position
14–GROUND : Continuity with the front LH door open3, 6–GROUND : Always approx. 12 volts
8–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C15 34 J3 35 J13 35
D1636 (Access Cab) J4 35 J21 A 35
D1637 (Standard Cab) J7 35 J22 B 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C
1H 26 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J
( ) ( )
1K 26 (*1) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1N27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1O27 (*1) Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
126
LIGHT AUTO TURN OFF (w/ DAYTIME RUNNING LIGHT)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IF 44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
127
MEMO
2003 TOYOTA TUNDRA (EWD491U)
128
LIGHT AUTO TURN OFF (w/o DAYTIME RUNNING LIGHT)
5AECU IG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
15ATAIL
OFF
TAIL
HEAD
E
E
1C6
1K5
1
3 2
2 2
2
5
A
IF
J 3JUNCTIONCONNECTOR
BE25
BG24
1
14 6
R–B L
E
13 14
R–B R
H–L
P R
ELA
Y
BATTERY
B–L
LIG
HT
CO
NT
RO
L S
W[C
OM
B.
SW
]
C15
16
W–B
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
L
L
L
L
JUN
CTI
ON
CO
NN
EC
TOR
J 4
R
( *3)
( *4)
( *4)
(* 4)
1H7
G–Y
* 4 : ACCESS CAB* 3 : STANDARD CAB
9
INTEGRATION RELAY
* 2 : EXCEPT TOWING PACKAGE* 1 : TOWING PACKAGE
A
II
J13JUNCTIONCONNECTOR
I 2
W–B
W–B
1J8
8
W–B
W–B
A
30APOWER
3 2
1
1L131L51L6
F
F
JUN
CTI
ON
CO
NN
EC
TOR
J 7
G–Y
( *5)
G–Y
( *5)
( *6) AC
BA JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
R–B
( *1) B ( *2)
* 5 : W/ DOOR LOCK CONTROL* 6 : W/O DOOR LOCK CONTROL
2003 TOYOTA TUNDRA (EWD491U)
129
With the ignition SW turned on, the current flows to TERMINAL 9 of the integration relay through ECU IG fuse.Voltage is applied at all times to TERMINAL 6 of the integration relay through the TAIL fuse, and through the H–LP relay coilside.
1. NORMAL LIGHTING OPERATION<Turn taillight on>With the light control SW turned to TAIL position, a signal is input into the integration relay. Due to this signal, the currentflowing to TERMINAL 6 of the relay flows to TERMINAL 14 of the light control SW to TERMINAL 16 to GROUND, andtaillights to turn on.
<Turn headlight on>With the light control SW turned to HEAD position, a signal is input into the integration relay. Due to this signal, the currentflowing to the relay flows to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND in the headlight circuit, andcauses taillight and H–LP relay to turn the lights on. The taillight circuit is same as above.
2. LIGHT AUTO TURN OFF OPERATIONWith light on and ignition SW turned off (Input signal goes to TERMINAL 9 of the relay), when the driver’s door is opened(Input signal goes to TERMINAL 14 of the relay), the relay operates and the current is cut off which flows from TERMINAL 6and through the H–LP relay coil side of the relay to taillight circuit and headlight circuit.As a result, all lights are turned off automatically.
H–LP RELAY5–3 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
C15 LIGHT CONTROL SW [COMB. SW]13–16 : Closed with light control SW at HEAD position14–16 : Closed with light control SW at TAIL or HEAD position
D16 DOOR COURTESY SW FRONT LH1–GROUND : Continuity with the front LH door open
INTEGRATION RELAY9–GROUND : Approx. 12 volts with the ignition SW at ON position
14–GROUND : Continuity with the front LH door open3, 6–GROUND : Always approx. 12 volts
8–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C15 34 J3 35 J13 35
D1636 (Access Cab) J4 35 J21 A 35
D1637 (Standard Cab) J7 35 J22 B 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C
1H 22 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J
( ) ( )
1K 22 (*2) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2) Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
130
LIGHT AUTO TURN OFF (w/o DAYTIME RUNNING LIGHT)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IF 44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
131
MEMO
2003 TOYOTA TUNDRA (EWD491U)
132
TRAILER TOWING
2
5 1
3 2
2
2 2
TOW
TA
ILR
ELA
Y
30A
TO
W T
AIL
2
IA412 IA420
BB24 AC
BA JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
OFF
TAIL
HEAD
14
16
IF
A
R–B
G R–B
R–B
W–B
BB21
1 3
IA41
30A
TO
W B
RK
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
2
1
2
15A
ST
OP
1F2
1G4
E
E
5
G
ST
OP
LIG
HT
SW
S 4
C
CC
6
4
G–Y
G–W
G–W
G
G–W
INTE
GR
ATI
ON
RE
LAY
C
C
BR
( *1)
BR
( *1)
L
( *1)
( *1)L
G
IH
OPTIONCONNECTOR
O 5
JUNCTIONCONNECTOR
J 8
BK22BK14
4
15A
TA
IL
EE G
L(*1)
G(*1)
JUNCTIONCONNECTOR
J10
JUNCTIONCONNECTOR
J10
JUNCTIONCONNECTOR
J12
LIGHT CONTROL SW[COMB. SW]
C15
JUNCTIONCONNECTOR
J 3
11
B–W
B–R
B–R
B–W
2 2
G( *
1)
L
B
BRK GND STOP
+B TAIL
( *1)
( *1)
( *1)
( *1)
(* 1)
( *1)
BR
( *1)
( *1)
* 2 : EXCEPT TOWING PACKAGE* 1 : TOWING PACKAGE
* 4 : W/O DOOR LOCK CONTROL* 3 : W/ DOOR LOCK CONTROL
1E5
C
C
B–Y ( *1)
JUN
CTI
ON
CO
NN
EC
TO
R
J 1
B–Y
( *1)
2
15
23
2
C
C
W–B
( *1)
JUN
CTI
ON
CO
NN
EC
TOR
J 2
W–B
( *1)
22
A
A
JUN
CTI
ON
CO
NN
EC
TOR
J18
W–B
( *1)
EA
SU
B B
ATT
RE
LAY
30A
SU
B B
ATT
2
2
B ( *1)
IA44
BK21
BB22
B
1
L–W
( *1)
L
(*1)
G–W
B
B
W–B
( *1)
( *1)
( *1)
( *1)
( *1)
(* 1)
BR
( *2)
BR(*2)
2003 TOYOTA TUNDRA (EWD491U)
133
10AGAUGE
1F7
3 2
5 1
1F9
4 2
9 1
IA421
30A
TO
WIN
G
2
BB25 BB26
BK13 BK11
B4 (*2)A5 (*1)
B3A3
A6 (*1)A2B1 (*2)
A1B2
A7
BL
BK12
A4
IE
6
3
1D6 1D9
1D7 1D10
G–B
G–Y
G–B
G–Y
8
1J5
20A
HA
Z
2
IA422
BK23
BB17
2
3
IE126
2
1 3
15AACC
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G11
IE12
C
C
EA
1 4
E A
3 2
5A T
UR
N
L(*1)
G(*1)
B
G–W
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
T 6 ,
TRAILERSOCKET
A B
JUN
CTI
ON
CO
NN
EC
TO
R
J 9
BACK–UP LIGHT SW[PARK/NEUTRAL POSITION SW]
P 1
DIODE(A/T)
D 8
TOWING CONVERTERT 9
TUR
N S
IGN
AL
FLA
SH
ER
T 5
BA
CK
–UP
LIG
HT
RE
LAY
B 3
JUN
CTI
ON
CO
NN
EC
TOR
J12
JUNCTIONCONNECTOR
J 8
LTIN RTIN +B
B/UP STTL STTR
STIN LTOT RTOT GND
BRK TAIL BATT GND
G–W
R–B
R–B
B–Y
B–Y
B–Y GR
GR
GR
R–B
L–W
L–W
B–Y
B–Y
R BR
R–B
L–B
R–B
R BRL–
B
R–B
R–B
Y R BR
W–B
L
G( *
1)
B WW
–B
W–B
11
2 2
IG +B
LL LR
(*3)
( *3)
( *4)
B10
R–B
Y ( *1)
( *1)
( *1)
( *1)Y G( *2)
( *2)
( *1)
AA
BA BA
W–BW–B
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
(* 1)
(*1)
(*1)
(*1)
(*1) (*1)
( *1)
BR(*2)
BR
( *2)
B10
W
2003 TOYOTA TUNDRA (EWD491U)
134
TRAILER TOWING
T9 TOWING CONVERTER1–GROUND : Always approx. 12 volts6–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
B3 34 J10 35 P1 33 (5VZ–FE)
C15 34 J12 35 S4 35
D8 34J18
31 (2UZ–FE) T5 35
J131 (2UZ–FE)
J1833 (5VZ–FE)
A36 (Access Cab)
J133 (5VZ–FE) J21 A 35
T6
A37 (Standard Cab)
J231 (2UZ–FE) J22 B 35
T6
B36 (Access Cab)
J233 (5VZ–FE) J23 A 35
B37 (Standard Cab)
J3 35 J24 B 35 T9 35
J8 35 O5 35
J9 35 P1 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1D26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
BB148 (Access Cab)
BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB248 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB250 (Standard Cab)
BK148 (Access Cab)
BK150 (Standard Cab)
Frame Wire and Frame No 3 Wire (Near the License Plate Light)
BK248 (Access Cab)
Frame Wire and Frame No.3 Wire (Near the License Plate Light)
BK250 (Standard Cab)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
135
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IE44 Left Kick Panel
IF44 Left Kick Panel
IH 44 Right Kick Panel
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B10 48 (Access Cab) Frame Wire B10 50 (Standard Cab) Frame Wire
2003 TOYOTA TUNDRA (EWD491U)
136
CARGO LIGHT
5ACARGOLP
A12
A9B1
1H10
11
I24
INTEGRATION CONTROLAND PANEL
BA , I25
1D2
1H
2
A
IF
J 3JUNCTIONCONNECTOR
A
II
J13JUNCTIONCONNECTOR
2
3
1A2
1J8
W–B
R–B
W–B
W–B
W–B
R–B
W–R
R–B
5
AA
CARGO LIGHT[HIGH MOUNTED STOP LIGHT]
H10
GND L
+B
1A7
10AGAUGE
C3 A9
1F5
IE23IE36
IE225IE34
C13 C2B8
IE19 IE117(A/T)(M/T)
2 3
1
P–L
P–L
G–B
R–L
P–L
P–L
G–B
R–L
IE17IE12
1F8
SP
EE
DO
ME
TE
R
C
BR
IH
C
G–O
B–Y
B–Y
B–Y
B–Y
BR VEHICLE SPEED SENSOR
(COMBINATION METER)
V 2
( *1)
( *1)
( *2)
( *2)
( *2)
( *2)
( *1)
( *1)
(*1)(*2)
J 8JUNCTIONCONNECTOR
D
D
J 9JUNCTIONCONNECTOR
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
* 2 : 5VZ–FE* 1 : 2UZ–FE
C11
CO
MB
INA
TIO
N M
ET
ER
BA
, C
12
* 3 : W/ DAYTIME RUNNING LIGHT* 4 : W/O DAYTIME RUNNING LIGHT
INTEGRATIONRELAY
C,
C13
G–O
1N1L
1111
1L1N
105 (*3)
(*4)
(*4)(*3)
2003 TOYOTA TUNDRA (EWD491U)
137
I24 (A), I25 (B) INTEGRATION CONTROL AND PANEL(B) 1–GROUND : Always continuity(A)12–GROUND : Always. approx. 12 volts
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34 I24 A 35 J13 35
C12 B 34 I25 B 35V2
31 (2UZ–FE)
C13 C 34 J3 35V2
33 (5VZ–FE)
H1036 (Access Cab) J8 35
H1037 (Standard Cab) J9 35
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1D22 (*2)
1D26 (*1)
1F22 (*2)
1F26 (*1)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
1L 23 (*2)
1N 27 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
: GROUND POINTS
Code See Page Ground Points Location
IF 44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
138
INTEGRATION CONTROL AND PANEL
10AA/C
2
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F5
B12
W–L
W–L
E
E
M
B4 A15 A13
5
E
2 1
B–Y
B–Y
B–Y
B–W B
AIR
INLE
T C
ON
TRO
LS
ER
VO
MO
TOR
A15
JUNCTIONCONNECTOR
J 8
2
BFRS RECIG
IE216IE38
A/C
MA
GN
ET
ICC
LUT
CH
A8
IA48 IA417
A6 B11
2
1
A/C
DU
AL
PR
ES
SU
RE
SW
A 1
L–R
W–L
(*3)(*4)
O
L–W
O
L–W
MGC IG+ AC+2
IA52
+
FRS REC
1
I24
INTEGRATION CONTROL AND PANEL
BA , I25
B1 (*2)A3 (*1)
4 IE1
(*1)
W–L
( *2)
L–R
( *1)
( *2)
1F9
B–Y
A9
B–Y
C11
CO
MB
INA
TIO
N M
ETE
R
BA
, C
12
4 A
(*1)
BR–Y
5 A
21 20 7 4
(*1)
Y–B
( *1)
Y–B ( *1)
BR
–Y
( *1)
G–Y
( *1)P
2–4H–L
IND1IND2
4WD CONTROL ECUF 7
IND1 IND2 H–L 2–4
8 A11 B B3 B2
B10 D1
D,
C14
E
B–Y
B9
7
6
DE
FRO
STE
R S
W[B
LOW
ER
SW
]
B 6
B–L
L
A/C MAGNETICCLUTCH
AA 2 , A 3B
( *2)
( *2)
( *2)
( *2)
4LO
4HI
2003 TOYOTA TUNDRA (EWD491U)
139
2
1
A20 A10 A17B14
A/C
TH
ER
MIS
TO
RA
13
B–L
W–G
8
G–R
IN E ACC1 B1
A18 A19
A3B33
A9 (*2)B2
L–B
L–Y
E 3
ENGINE CONTROLMODULE
BA , E 4
AIND(*1)ACT(*2)
A/CM(*1)AC1(*2)
10ADOME
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
1E6
1F4
A3 A1 B5
15AACC
1G10
B13 A12
2
IH
A
II
J13
JUN
CT
ION
CO
NN
EC
TO
R
A16 B1 B7 B8 A7 A9
I 2
GR
L–Y
L–Y
L–Y
W–BR
P 4
PA
SS
EN
GE
R A
IRB
AG
MA
NU
AL
ON
–OF
F S
W
PIND GND1 B ACC +B
BKLD GND IL–1 ILL– ILL+ L
B–R
W–B
R–B
G
W–G
G–W
W–B W–B
W–BW–BA
G
W–G
G–W
* 2 : 5VZ–FE* 1 : 2UZ–FE
* 4 : 5VZ–FE M/T* 3 : 5VZ–FE A/T
ACC EHW
1
I24
INTEGRATION CONTROL AND PANEL
BA , I25
B3
2
1
* 6 : W/O DAYTIME RUNNING LIGHT* 5 : W/ DAYTIME RUNNING LIGHT
BUCKLESW
1
3
2
8
RBE+
CENTERAIRBAGSENSORASSEMBLY
C 6
SE
AT
BE
LT W
AR
NIN
G O
CC
UP
AN
TD
ETE
CT
ION
SE
NS
OR
AN
D B
UC
KLE
SW
RH
S 5
B–L
B31 (*1)
A21
L
A/CS
(*1)
RADIO ANDPLAYER
R 2 B
( *2)
( *2)
GR
TURN SIGNALFLASHER
T 5
AB
BC
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
W–R
ACLD(*1)ACT(*2)
ACMG(*1)AC1(*2)
A/CS
2003 TOYOTA TUNDRA (EWD491U)
140
INTEGRATION CONTROL AND PANEL
IF
J 3JUNCTIONCONNECTOR
4
1
STE
ER
ING
SW
[CO
MB
. S
W]
C16
RH
EO
STA
TR
3
E
E
E E
E
G GGG
JUNCTION CONNECTORJ10
BR
W–G
W–G
W–B
1
2 3
E
E
EG
W–G
G–W
W–B
JUNCTIONCONNECTOR
J 5
E
G
G–Y
DIODE(IDLE–UP)
D10
ELS1 2
( *1)
(* 1)
W–B
G–W
G
5ACARGOLP
15ATAIL
HEAD
TAIL
OFF
1G41H10
1H2 1A7
1D2
11 4
6 5
2
3
R–B
14
16
W–R
W–B
R–B
R–B
CA
RG
O L
IGH
T[H
IGH
MO
UN
TE
D S
TOP
LIG
HT
]
H10
W–B
LIG
HT
CO
NTR
OL
SW
[CO
MB
. S
W]
C15
W–B
G
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
R–B
B15
B14
C12
ME
TER
ILL
UM
INA
TIO
N[C
OM
B.
ME
TER
]
B
AC
BA
R–B
E
EDEC
BR
( *1)
BR
( *2)
INTEGRATION RELAY
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
R–B
1J8
1A2
W–B
AA
IE15IE117
(*1)(*2)
1L1N
134 (*5)
(*6)1L1N
105 (*5)
(*6)
A12
ENGINE CONTROLMODULE
E 3 A
2003 TOYOTA TUNDRA (EWD491U)
141
I 1
2
1
1
2
1
2
GLO
VE
BO
XLI
GH
T
G 3
AS
HTR
AY
ILLU
MIN
AT
ION
A18
CIG
AR
ETT
E L
IGH
TER
ILLU
MIN
AT
ION
C 8
R 1
RA
DIO
AN
D P
LAY
ER
BA
, R
2
A5
B10
ID24 ID23
ID25 ID26
EE E
EE
G G G
G
G
G
JUNCTION CONNECTORJ12
W–G
W–G
W–G
W–G
W–B
G–W
* 1 : 2UZ–FE
W–B
G–W
G
* 2 : 5VZ–FE* 5 : W/ DAYTIME RUNNING LIGHT
3
1
MIR
RO
R H
EA
TER
SW
M 4
E
GW
–G
E E E
JUNCTIONCONNECTOR
J 5
* 6 : W/O DAYTIME RUNNING LIGHT
IE
BA
BA
JUNCTIONCONNECTOR
BJ23 , J24A
W–B
W–B
W–B
2003 TOYOTA TUNDRA (EWD491U)
142
INTEGRATION CONTROL AND PANEL
The integration control panel is composed by design components such as the cluster, resistor, heater control panel, and SW.The integration control panel controls systems such as the air conditioning, cargo light, 4WD (2UZ–FE) and hazard warninglight, clock, and the SRS.
I24 (A), I25 (B) INTEGRATION CONTROL AND PANEL(B)12–GROUND : Approx. 12 volts with ignition SW on and blower SW on(B) 4–GROUND : Approx. 12 volts with ignition SW at ON or ST position(B) 5–GROUND : Always approx. 12 volts(B)13–GROUND : Approx. 12 volts with ignition SW at ACC or ON position(B) 1–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
A130 (2UZ–FE) C16 34 J12 35
A132 (5VZ–FE) D10 34 J13 35
A2 B 32 (5VZ–FE) E3 A 34 J21 A 35
A3 A 30 (2UZ–FE) E4 B 34 J22 B 35
A13 34 F7 35 J23 A 35
A15 34 G3 35 J24 B 35
A18 34H10
36 (Access Cab) M4 35
B6 34H10
37 (Standard Cab) P4 35
C6 34 I24 A 35 R1 A 35
C8 34 I25 B 35 R2 B 35
C11 A 34 J3 35 R3 35
C12 B 34 J5 35S5
36 (Access Cab)
C14 D 34 J8 35S5
37 (Standard Cab)
C15 34 J10 35 T5 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1D22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1D26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
1G22 (*2)
1G26 (*1)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
1L 23 (*2)
1N 27 (*1)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
143
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
ID2 46 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
: GROUND POINTS
Code See Page Ground Points Location
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
ED 42 (5VZ–FE) Intake Manifold Left
IE44 Left Kick Panel
IF44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire I2 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
144
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
2
15AEFINO. 1
2
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
1 5
2 3
2
B–R
2 2
C
W–L
B–Y
B–R
B–R
EA
W B Y
4 8 7
W–L
P–L
G–R
D10D11 D15 35 DD
1D4
B19 C12A3
G–W B
B
1
W–B
5ASTA
1F6
THW
2
1
2
1
1F2
D32 E28 E19
I 3I 3
A/T
OIL
TE
MP
. S
EN
SO
RA
4
EN
GIN
E C
OO
LAN
TTE
MP
. S
EN
SO
R
E 2
GR–L
B–W
B–W
B–W
B–W
B–W B–W
1
ELE
CTR
ON
ICA
LLY
CO
NTR
OLL
ED
TR
AN
SM
ISS
ION
SO
LEN
OID
E 1
NO
. 1
NO
. 2
NO
. 3
EFI
RE
LAY
E2THOC
NCO–SLS2S1
STSWSTPBATT
V
6
9
N
P
PA
RK
/NE
UT
RA
LP
OS
ITIO
N S
W
P 1
W–B
G–Y
E 3
ENGINE CONTROL MODULE
BA , E 4 C, E 5 D, E 6
12
C
1D
JUN
CTI
ON
CO
NN
EC
TOR
J10
NCO+
P
27 D
B–Y
B–Y
2
1I 5
W–L
W–L
13 D
SLT+
B–R
G–W
SLT–
2 6
SLT
B
B
J 1
JUN
CT
ION
CO
NN
EC
TOR
W–L
B–R
A8
IA414
MREL
IA46IA415
W–B
1
2
ST
OP
LIG
HT
SW
S 4
A2
+B2+B
1 A
O G
O/D
DIR
EC
T C
LUTC
HS
PE
ED
SE
NS
OR
O 1
E, E 7
W–L
G–W
G–W
E17
P
STA
15ASTOP
P
IE115
E16
W–B
NSW
W–B
D9
STAR
I 3
TO S
TAR
TER
RE
LAY
( *2)
TO T
VIP
EC
U( *
1)P
A
A
A
JUN
CTI
ON
CO
NN
EC
TOR
J20
P
A
A
JUNCTIONCONNECTOR
J18
W–B
2003 TOYOTA TUNDRA (EWD491U)
145
(2UZ–FE)
B
ENGINE CONTROL MODULE
E 3
6
E02
E
L–O
B–W
E
6 5
21 E18
W–R
B11 B9 B8
J 9
3
JUNCTIONCONNECTOR
E03
7 C
EB
VTA
GR(*2)
B–Y
GR(*1)B
–Y
D 8DIODE (A/T)
ME01SP2+SP2–
2
B
RVC
17
34 D D26 C4
1
2
Y–R
W–B
V 3
VE
HIC
LE S
PE
ED
SE
NS
OR
( ELE
CT
RO
NIC
ALL
Y C
ON
TRO
LLE
D T
RA
NS
MIS
SIO
N)
DD
1
W–B
15AACC
1G11 9 1F
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
10AGAUGE
2
J 8JUNCTIONCONNECTOR
AA
EE
8
1F
1
R
W–B
W–B
W–B
L–O
3
L
G–OLGR–B
G–B
B–Y
L–B
B–Y
R–B
L
LG
G–O
E01
7 E
5 1F
B–Y
A , E 4 C, E 5 D, E 6
O 4
O/D
MA
IN S
W
B–Y
L SPD
* 1 : W/ DOOR LOCK CONTROL* 2 : W/O DOOR LOCK CONTROL
31 E B10
W–R
W–R
D
4
P–L
C1
BR
E1
VTA2
5AIGN
1F11
A9
IGSW
B–O
B–O
B
B JUN
CT
ION
CO
NN
EC
TO
R
J 5
G–OG–O
ODMS
16 A
B25
OILW
Y–R
3
TH
RO
TTLE
PO
SIT
ION
SE
NS
OR
T 2
E, E 7
EC
GR(*1)
W–B
J 9JUNCTIONCONNECTOR
ODLP
7 B
C
2
3
M+
R
2 C
1
W
M–
M– M+
GE01
17
BR
C
I 3
( SH
IELD
ED
)
2003 TOYOTA TUNDRA (EWD491U)
146
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
IE1
26
L
LL 2L DL NL RL PL
8 4 7 5 2 1
3
A9 C3
IE120 IE1 6 IE110 IE12 19 IE1IE111
D3
SP
EE
DO
ME
TER
O/D
OFF
CC
RB
B
B
B
B
A
A
D4D5D6D7D8D9L–
Y
R–B
LG–B
W–R
LG
LLG
L–BL–B
LGB–Y
R–B
L
LG
G–O
A/T INDICATOR SW[PARK/NEUTRAL POSITION SW]
P 1
BA
B8 A7
B–Y
IH
L–O
BR
BR
L 2 D N R P
C
C
J 8
JUN
CT
ION
CO
NN
EC
TO
R
C13 C2
IE19 IE117
P–L
R–L
2 3
P–L
R–L
W–B
L–Y
C11
CO
MB
INA
TIO
N M
ETE
R
BA
, C
12C
, C
13D
, C
14
L
JUN
CT
ION
CO
NN
EC
TO
R
J12
JUN
CT
ION
CO
NN
EC
TO
R
J 8
LG L
W–R
LG–B
R–B
W–R
R–B
C
CJU
NC
TIO
NC
ON
NE
CT
OR
J11
LG–B
W–R B
R–B
JUN
CT
ION
CO
NN
EC
TO
R
J12
1
VE
HIC
LE S
PE
ED
SE
NS
OR
( CO
MB
INA
TIO
N M
ET
ER
)
V 2
IE17
B–Y
B–Y
B–Y
Y–R
D10
A/T
OIL
TE
MP
.
CW
–B
Y–R
G–O
IE
I 2 BA
AAW–B W–B W–B
JUNCTIONCONNECTOR
BJ23 , J24A
2003 TOYOTA TUNDRA (EWD491U)
147
(2UZ–FE)
The electronically controlled transmission electrically controls the, throttle pressure, lock–up pressure, and accumulatorpressure etc. through the solenoid valve.The electronically controlled transmission is a system which precisely controls the gear shift timing and lock–up timing inresponse to the vehicle’s driving conditions and the engine condition detected by various sensors. It makes smooth drivingpossible by shift selection of the gear which is the most appropriate to the driving conditions at that time, and by preventingdowning, squat and gear shift shock when starting off.
1. GEAR SHIFT OPERATIONWhen driving, the engine warm up condition is input as a control signal from the engine coolant temp. sensor to TERMINALTHW of the engine control module, and the vehicle speed is input to TERMINAL SP2+ of the engine control module from thevehicle speed sensor. At the same time, the throttle valve opening signal from the throttle position sensor is input toTERMINALS VTA, VTA2 of the engine control module as a throttle angle signal. Based on these signals, the engine controlmodule selects the best shift position for the driving conditions and sends current to the electronically controlled transmissionsolenoid.
2. LOCK–UP OPERATIONWhen the engine control module decides based on each signal that the lock–up condition has been met, the current flowsfrom the engine control module TERMINAL SL to TERMINAL 7 of the electronically controlled transmission solenoid toGROUND.
3. STOP LIGHT SW CIRCUITIf the brake pedal is depressed (Stop light SW on) when driving in lock–up position, a signal is input to TERMINAL STP ofthe engine control module. As a result, the engine control module cuts the current to the solenoid to release the lock–up.
4. OVERDRIVE CIRCUIT∗ O/D main SW on
When the O/D main SW is switched to ON position, a signal is input to TERMINAL ODMS of the engine control module,and enables shift change to the overdrive range, through the control of the engine control module.
∗ O/D main SW offWhen the O/D main SW is switched to OFF position, a signal is input to TERMINAL ODMS of the engine control module,and prohibits shift change to the overdrive range through the control of the engine control module. When in the overdriverange already, shift down is made.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
148
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
E1 ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID4, 7, 8-GROUND : Approx. 13 Ω
O4 O/D MAIN SW3–1 : Open with O/D main SW at ON position
Closed with O/D main SW at OFF position
S4 STOP LIGHT SW1–2 : Closed with brake pedal depressed
E3(A), E4 (B), E5 (C), E6 (D), E7 (E) ENGINE CONTROL MODULES1-E1 : 9-14 volts with vehicle not move and shift lever in D position
S2,SL-E1 : 0-1.5 volts with vehicle not moveSTP–E1 : 7.5–14 volts with brake pedal depressed
: 0–1.5 volts with brake pedal releasedTHW–E1 : 0.2–1.0 volts with idling, engine coolant temp. 60°C (140°F)–120°C (248°F)
THOC–E1 : Below 1.0 volts with fluid temp. 110°C (230°F)VTA–E1 : 0.4–1.0 volts with ignition SW on and throttle valve fully closed
: 3.2–4.8 volts with ignition SW on and throttle valve fully openVC–E1 : 4.5–5.5 volts with ignition SW at ON or ST position
ODMS–E1 : 9–14 volts with O/D main SW turned on: 0–3 volts with O/D main SW turned off
SPD–E1 : Pulse generation with vehicle moving2–E1 : 7.5–14 volts with shift lever at 2 position
: 0–1.5 volts with shift lever at except 2 positionL–E1 : 7.5–14 volts with shift lever at L position
: 0–1.5 volts with shift lever at except L position+B–E1 : 9–14 volts with ignition SW at ON or ST position
BATT–E1 : Always 9–14 volts
P1 A/T INDICATOR SW [PARK/NEUTRAL POSITION SW]3–1 : Closed with shift lever in P position3–2 : Closed with shift lever in R position3–5 : Closed with shift lever in N position3–7 : Closed with shift lever in D position3–4 : Closed with shift lever in 2 position3–8 : Closed with shift lever in L position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A4 30 (2UZ–FE) E6 D 34 J23 A 35
C11 A 34 E7 E 34 J24 B 35
C12 B 34 J1 31 (2UZ–FE) O1 31 (2UZ–FE)
C13 C 34 J5 35 O4 35
C14 D 34 J8 35 P1 31 (2UZ–FE)
D8 34 J9 35 S4 35
E1 30 (2UZ–FE) J10 35 T2 31 (2UZ–FE)
E2 30 (2UZ–FE) J11 35 V2 31 (2UZ–FE)
E3 A 34 J12 35 V3 31 (2UZ–FE)
E4 B 34 J18 31 (2UZ–FE)
E5 C 34 J20 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
149
(2UZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
1D26 (*1)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA 40 (2UZ–FE) Front Left Fender
EB 40 (2UZ–FE) Rear Bank of Right Cylinder Head
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
IE 44 Left Kick Panel
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire I5 46 Cowl Wire
I3 46 Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
150
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
2
2
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F
2
1 5
2 3
2
B–R
2 2
IA414
W–B
B–R
B–R
IA46
JUN
CT
ION
CO
NN
EC
TO
R
A1
W B Y
4 8 7
R
G–R
E2E3 E1
1
1D4
A20A16
+B
G–W
1
W–B
W–L
THW
1
2
2
1
2 EF1
E19 E11 E18
1 EF1
I 3I 3
A/T
OIL
TE
MP
. S
EN
SO
RA
4
EN
GIN
E C
OO
LAN
TT
EM
P.
SE
NS
OR
E 2
G–Y
R–Y
G–Y
B–W
B–W
BR
–B
B–W
B–W
B–W B–W
ELE
CTR
ON
ICA
LLY
CO
NTR
OLL
ED
TR
AN
SM
ISS
ION
SO
LEN
OID
E 1
NO
. 1
NO
. 2
SL
EFIRELAY
E2OIL
SLS2S1
STPBATT
G–Y
E 3
ENGINE CONTROL MODULE
BA , E 4 D, E 6 E, E 7
G–W
G–W
C
J 1
B
B
W–L
W–L
2
B–R
B–Y
B–Y
B–Y
A4
EA
C
JUN
CTI
ON
CO
NN
EC
TOR
J10
IA4151D
B–Y
MREL
ST
OP
LIG
HT
SW
S 4
2
1
A7
BB
1F6
STA
IE212
9
6
N
P
PA
RK
/NE
UT
RA
LP
OS
ITIO
N S
W
P 1
PPP
AA
A
B3
P
NSW
JUN
CTI
ON
CO
NN
EC
TO
R
J 8
IA424
G–R
W–B
IE219
W–B
2
3 1
5 2
2
W
ST
RE
LAY
W–B
2
C8 C3
( *4)
( *3)P ( *3)
G–R
15AEFINO. 1
15ASTOP
5ASTA
SRLY ST
TVIP ECU
T13 C
O
2 6
G
W–L
G–W
C11
SLT–
C
B–R
5
SLT+
JUN
CTI
ON
CO
NN
EC
TOR
J18
A
A
C, E 5
2003 TOYOTA TUNDRA (EWD491U)
151
(5VZ–FE)
B
ENGINE CONTROL MODULE
E 3
7
E03
E
L–O
B–W
E
3 4
15
1
E25
W–R
B6 B5 B4
J 9
3
JUNCTIONCONNECTOR
E02
5 E
ED
VTA
GR(*4)
B–Y
GR(*3)
B–Y
D 8DIODE (A/T)
OILWE1SP2+SP2–
2
A
RVC
6
22 D D23 D17 B21
1
2
Y–R BR
V 3
VE
HIC
LE S
PE
ED
SE
NS
OR
( ELE
CT
RO
NIC
ALL
Y C
ON
TR
OLL
ED
TR
AN
SM
ISS
ION
)
DD
1
Y–R
W–B
Y–R
W–B
15AACC
1G11 9 1F
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
10AGAUGE
2
J 8JUNCTIONCONNECTOR
AA
EE
8
1F
1
W–B
W–B
W–B
3
L
G–OLGR–B
G–B
B–Y
L–B
B–Y
R–B
L
LG
G–O
THROTTLE POSITIONSENSOR
T 2
* 1 : W/ CRUISE CONTROL* 2 : W/O CRUISE CONTROL
E01
4 E
5 1F
B–Y
BR
A , E 4 D, E 6 E, E 7
O 4
O/D
MA
IN S
W
B–Y
L SP1
E8
W–B
5AIGN
1F11
A15
IGSW
B–O
E04
* 3 : W/ DOOR LOCK CONTROL* 4 : W/O DOOR LOCK CONTROL
G–B
B–Y
B–O
G–O
W–B
GR(*3)
J 9JUNCTIONCONNECTOR
ODLP
B20
L–O
ODMS
B14
R
W–B
BR
ME01
6 D
IE
AA
BA
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
C
2
4
VTA2
R–B
R–B
W–R
B25
D
W–R
JUN
CT
ION
CO
NN
EC
TO
RJ
5
B
B
B–O
B–O
( *1)
( *1)
( *2)
( *1)
C, E 5
2003 TOYOTA TUNDRA (EWD491U)
152
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
IE1
4
L
LL 2L DL NL RL PL
8 4 7 5 2 1
3
A/T
OIL
TE
MP
.
A9 C3
IE26 IE226 IE22 IE215 21 IE2IE223
D10 D3
SP
EE
DO
ME
TE
R
O/D
OFF
CC
C
B
BB
B
A
A
D4D5D6D7D8D9
R–B
LG–B
W–R
LG
LLG
L–BL–B
LGB–Y
R–B
L
LG
G–O
A/T INDICATOR SW[PARK/NEUTRAL POSITION SW]
P 1
BA
B8 A7
B–Y
IH
L–O
Y–R
Y–R B
R
W–B
BR
L 2 D N R P
C
J 8
JUN
CT
ION
CO
NN
EC
TO
R
C13 C2
IE23 IE225
P–L
G–B
2 3
P–L
G–B
W–B
L–Y
L–Y
C11
CO
MB
INA
TIO
N M
ET
ER
BA
, C
12C
, C
13D
, C
14
L
JUN
CT
ION
CO
NN
EC
TO
R
J12
JUN
CTI
ON
CO
NN
EC
TOR
J 8
LG L
W–R
LG–B
R–B
W–R
R–B
JUN
CTI
ON
CO
NN
EC
TOR
J12
VE
HIC
LE S
PE
ED
SE
NS
OR
( CO
MB
INA
TIO
N M
ET
ER
)
V 2
IE12
1 B–Y
B–Y
B–Y
B–Y
G–O
RB
C
I 2W–B
IE
L
W–R
W–R
B
BA
AAW–B W–B
JUNCTIONCONNECTOR
BJ23 , J24A
2003 TOYOTA TUNDRA (EWD491U)
153
(5VZ–FE)
Previous automatic transmissions have selected each gear shift using mechanically controlled throttle hydraulic pressure,governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electricallycontrols the governor pressure and lock-up sensor through the solenoid valve. Control of the solenoid valve by the enginecontrol module based on the input signals from each sensor makes smooth driving possible by shift selection for each gearwhich is most appropriate to the driving conditions at that time.
1. GEAR SHIFT OPERATIONDuring driving, the engine control module selects the shift for each gear which is most appropriate to the driving conditions,based on input signals from the engine coolant temp. sensor to TERMINAL THW of the engine control module and also theinput signals to TERMINAL SP2+ of the engine control module from the vehicle speed sensor devoted to the electronicallycontrolled transmission. Current is then output to the electronically controlled transmission solenoid. When shifting to 1stspeed, current flows from TERMINAL S1 of the engine control module to TERMINAL 4 of the electronically controlledtransmission solenoid to GROUND, and continuity to the No.1 solenoid causes the shift.For 2nd gear, current flows from TERMINAL S1 of the engine control module to TERMINAL 4 of the electronically controlledtransmission solenoid to GROUND, and from TERMINAL S2 of the engine control module to TERMINAL 8 of theelectronically controlled transmission solenoid to GROUND. And continuity to solenoid No.1 and No.2 causes the shift.For 3rd gear, there is no continuity to No.1 solenoid, only to No.2 causing the shift. Shifting into 4th gear (Overdrive) takesplace when there is no continuity to either No.1 or No.2 solenoid.
2. LOCK-UP OPERATIONWhen the engine control module judges from each signal that lock-up operation conditions have been met, current flowsfrom TERMINAL SL of the engine control module to TERMINAL 7 of the electronically controlled transmission solenoid toGROUND, causing continuity to the lock-up solenoid and causing lock-up operation.
3. STOP LIGHT SW CIRCUITIf the brake pedal is depressed (Stop light SW on) when driving in lock–up position, a signal is input to TERMINAL STP ofthe engine control module. As a result, the engine control module cuts the current to the solenoid to release the lock–up.
4. OVERDRIVE CIRCUIT∗ O/D main SW on
When the O/D main SW is switched to ON position, a signal is input to TERMINAL ODMS of the engine control module,and enables shift change to the overdrive range, through the control of the engine control module.
∗ O/D main SW offWhen the O/D main SW is switched to OFF position, a signal is input to TERMINAL ODMS of the engine control module,and prohibits shift change to the overdrive range through the control of the engine control module. When in the overdriverange already, shift down is made.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
154
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
E1 ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID4, 7, 8-GROUND : Approx. 13 Ω
O4 O/D MAIN SW3–1 : Open with O/D main SW at ON position
Closed with O/D main SW at OFF position
S4 STOP LIGHT SW1–2 : Closed with brake pedal depressed
E3(A), E4 (B), E6 (C), E7 (D) ENGINE CONTROL MODULES1-E1 : 9-14 volts with vehicle not move and shift lever in D position
S2,SL-E1 : 0-1.5 volts with vehicle not moveSTP–E1 : 7.5–14 volts with brake pedal depressed
: 0–1.5 volts with brake pedal releasedTHW–E1 : 0.2–1.0 volts with idling, engine coolant temp. 60°C (140°F)–120°C (248°F)VTA–E1 : 0.3–1.0 volts with ignition SW on and throttle valve fully closed
: 3.2–4.9 volts with ignition SW on and throttle valve fully openVC–E1 : 4.5–5.5 volts with ignition SW at ON or ST position
ODMS–E1 : 9–14 volts with O/D main SW turned on: 0–3 volts with O/D main SW turned off
SP1–E1 : Pulse generation with vehicle moving2–E1 : 7.5–14 volts with shift lever at 2 position
: 0–1.5 volts with shift lever at except 2 positionL–E1 : 7.5–14 volts with shift lever at L position
: 0–1.5 volts with shift lever at except L position+B–E1 : 9–14 volts with ignition SW at ON or ST position
BATT–E1 : Always 9–14 voltsOIL–E2 : 0.1–0.9 volts after engine warm up
OILW–E1 : 0–1.5 volts with engine cranking at 400 rpm or more
P1 A/T INDICATOR SW [PARK/NEUTRAL POSITION SW]3–1 : Closed with shift lever in P position3–2 : Closed with shift lever in R position3–5 : Closed with shift lever in N position3–7 : Closed with shift lever in D position3–4 : Closed with shift lever in 2 position3–8 : Closed with shift lever in L position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A4 32 (5VZ–FE) E5 C 34 J23 A 35
C11 A 34 E6 D 34 J24 B 35
C12 B 34 E7 E 34 O4 35
C13 C 34 J1 33 (5VZ–FE) P1 33 (5VZ–FE)
C14 D 34 J5 35 S4 35
D8 34 J8 35 T2 33 (5VZ–FE)
E1 32 (5VZ–FE) J9 35 T13 C 35
E2 32 (5VZ–FE) J10 35 V2 33 (5VZ–FE)
E3 A 34 J12 35 V3 33 (5VZ–FE)
E4 B 34 J18 33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
155
(5VZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
1D26 (*1)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EF1 42 (5VZ–FE) Engine Wire and Sensor Wire (Over the Cylinder Head)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE146 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE246 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA 42 (5VZ–FE) Front Left Fender
ED 42 (5VZ–FE) Intake Manifold Left
IE 44 Left Kick Panel
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire I3 46 Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
156
ABS
5AECU IG
1K3
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F5
YB–Y
EA17
B–L
YW
D
D
W
7
11 63
B–L
2
1
40A
AB
S2
1
40A
AB
S3
2 2
B–R
B–Y
EA13EA16
22
L
EA15
L
12
23
LG
EA12
LG
FR–FR+
B–Y
B–R
JUNCTIONCONNECTOR
J 5
DATA LINK CONNECTOR 3D 6
ABS SPEED SENSORFRONT RH
A 7
8
V
EA14
V
12
9
P
EA11
P
FL–FL+
ABS SPEED SENSORFRONT LH
A 6
15
TC
W–G
D
171
+BS +BM WA IG1D/G
JUNCTIONCONNECTOR
J 8
ABS ACTUATOR WITH ECUA 5
BATTERY
22
SIL
D
W–G
13
TC
W–G
R–L
7
TS
12
TS
A9
C7
AB
S W
AR
NIN
G L
IGH
T[C
OM
B.
ME
TE
R]C
C11
A,
C13
( *1) B ( *2)
2003 TOYOTA TUNDRA (EWD491U)
157
14
L–R
TO D
ETE
CTI
ON
SW
( TR
AN
SF
ER
L4
PO
SIT
ION
)
EXI
4
W
5
R
RL–RL+
BB18 BB19
R W
2 1
20
Y
19
B
RR–RR+
BB110 BB111
B Y
4 3
II
A A
2
GND1
18
GND2
24
STP
15ASTOP
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F2
G–Y
1
2
G–W
C
C
G–W
W–B
W–B
JUNCTIONCONNECTOR
J10
ABS ACTUATOR WITH ECUA 5
JUNCTIONCONNECTOR
J13
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE
ABS SPEED SENSOR REARA19
LH RH
ST
OP
LIG
HT
SW
S 4
2003 TOYOTA TUNDRA (EWD491U)
158
ABS
This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left frontwheel, and rear wheels when the brakes are applied in a panic stop so that the wheels do not lock.This results in improved directional stability and steerability during panic braking.
1. INPUT SIGNAL(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the ABS actuator with ECU.(2) Stop light SW signal
A signal is input to TERMINAL STP of the ABS actuator with ECU when the brake pedal is depressed.
2. SYSTEM OPERATIONDuring sudden braking, the ABS actuator with ECU which has signals input from each sensor lets the hydraulic pressureacting on each wheel cylinder escape to the reservoir.The pump inside the ABS actuator with ECU is also operating at this time and it returns the brake fluid from the reservoir tothe master cylinder, thus preventing locking of vehicle wheels.If the ABS actuator with ECU judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current actingon the solenoid is controlled and the hydraulic pressure is increased.Holding of the hydraulic pressure is also controlled by the ECU, by the same method as above, by repeated pressurereduction. Holding and increase are repeated to maintain vehicle stability and to improve steerability during sudden braking.
A6, A7 ABS SPEED SENSOR FRONT LH, RH1–2 : 0.92–1.22 kΩ (20°C, 68°F)
A19 ABS SPEED SENSOR REAR1–2 : 0.89–1.29 kΩ (20°C, 68°F)3–4 : 0.89–1.29 kΩ (20°C, 68°F)
A5 ABS ACTUATOR WITH ECU6–GROUND : 10–14 volts with ignition SW at ON or ST position
24–GROUND : 10–14 volts with stop light SW on (Brake pedal depressed)2, 18–GROUND : Always continuity
S4 STOP LIGHT SW2–1 : Closed with brake pedal depressed
: PARTS LOCATION
Code See Page Code See Page Code See Page
A530 (2UZ–FE)
A1936 (Access Cab) J8 35
A532 (5VZ–FE)
A1937 (Standard Cab) J10 35
A630 (2UZ–FE) C11 A 34 J13 35
A632 (5VZ–FE) C13 C 34 S4 35
A730 (2UZ–FE) D6 34
A732 (5VZ–FE) J5 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
159
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA140 (2UZ–FE)
Cowl Wire and Engine Room Main Wire (Right Fender)EA142 (5VZ–FE)
Cowl Wire and Engine Room Main Wire (Right Fender)
BB148 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
: GROUND POINTS
Code See Page Ground Points Location
II 44 Right Kick Panel
2003 TOYOTA TUNDRA (EWD491U)
160
CRUISE CONTROL (2UZ–FE)
15AEFI NO. 1
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
5 1
3 2
2 2
2 2
A8 A3
5AIGN
1F11
B
B
15ASTOP
1F2
B12 B19
EA
A2 A1 C1
EC
I 5
IA414
B
C4 C7 E6 E7
EB
E21 E31E28
10AETCS
2
IA51
B6
B–Y
B–R
B–R
B–Y
B–R
B–Y
B–R
B–O
A9
B–O
B–O
G–Y
EFI
RE
LAY
B
JUN
CTI
ON
CO
NN
EC
TOR
J 5
E 3
ENGINE CONTROL MODULE
BA , E 4 C, E 5 D, E 6
+B2 +B E1ME01 E03 E02 E01 E2 VTA1 VTA2
MREL BATT IGSW ST1– STP
W–L
W–L
BR
W–B
W–B
W–B
W–B
B–W B–Y
P–L
W–L
W–B
W–L
6 4 5
3
W–B
W–B
W–B
BR
W–B
W–L
W–L B
JUNCTIONCONNECTOR
J 1
THR
OT
TLE
PO
SIT
ION
SE
NS
OR
T 2
W–G
W–G
2
+BM
BR
I 3BRBR
B–W
G–W
2
1D1
STOP LIGHTSW
S 4
JUNCTIONCONNECTOR
J10
L–B
G–W
3 2
4 1
C
1 1
IA415 IA46
C
1D
4 G–W
E, E 7
A
A JUN
CTI
ON
CO
NN
EC
TO
R
J18
W–B
E18
VC
C17
GE01
C3
M–
G–B
C2
M–
I 3
1
R
2
W
( SH
IELD
ED
)
BR
2003 TOYOTA TUNDRA (EWD491U)
161
10AGAUGE
1F8
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
B17 B13
A22 A23 A28
B8 C13 C2
C3 A9
1F5
D D
IH
C
C
IE19 IE117 IE17
* 2 : W/O DOOR LOCK CONTROL* 1 : W/ DOOR LOCK CONTROL
B–Y
B–Y
G–O G–O
JUNCTIONCONNECTOR
J 9
CRUISE
SP
EE
DO
ME
TE
R
C11
CO
MB
INA
TIO
N M
ETE
R
CA
, C
13
R–G L
V–R
BR
B–R
6 3 5
ACCEL PEDAL POSITION SENSORA20
JUNCTIONCONNECTOR
J 8
VEHICLE SPEEDSENSOR(COMBINATION METER)
V 2
P–L
L–Y
P–L
L–Y
B–Y
SPD
VPA VPA2 EPA
PI
1
2 3
BR
B24
CCS
G
4
5
BR
CR
UIS
E
RES/ACC
SET/COAST
CANSEL
CRUISE CONTROL SW[COMB. SW]
C16
IE1
5BR
B–Y
ECC
CCS
B10
D
B
B
W–R
JUNCTIONCONNECTOR
J 8
6 IE1
7
3
IE126
1G11
15AACC
1F9
DIO
DE
(A
/T)
D 8
JUNCTIONCONNECTOR
J 8
D POSITION SW[PARK/NEUTRAL POSITION SW]
P 1
2
A
E
A
E
3
1
L–B
GR(*1)
B–Y
GR(*2)
GR(*1)
L–B
W–R
W–R
B–Y
GR(*2)
J 9JUNCTIONCONNECTOR
E 3
ENGINE CONTROL MODULE
BA , E 4 E 5, C D, E 6 E, E 7
LG–R
EPA2
A29A26 A27
P–G
G–R
24 1
VCPA VCP2
G–O
II12
G
B,
C12
C9
2003 TOYOTA TUNDRA (EWD491U)
162
CRUISE CONTROL (2UZ–FE)
The cruise control system is a constant vehicle speed controller which controls the opening angle of the engine throttle valveby the SW, and allows driving at a constant speed without depressing the accelerator pedal.
SET CONTROLWhen the SET/COAST SW is operated while traveling with the main SW on, the speed when the SET/COAST SW isoperated to off is memorized, and the vehicle speed is controlled at that speed.
COAST CONTROLWhen the SET/COAST SW is operated to on, the cruise control opening angle requirement is turned to 0 to decrease thevehicle speed, and the speed when the SET/COAST SW is operated to off is memorized, and the vehicle speed is controlledat that speed.Furthermore, every time the SET/COAST SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehiclespeed is decreased by approx. 1.6 km/h (1.0 mph).
ACCEL CONTROLWhen the RES/ACC SW is operated to on, the throttle motor rotates the throttle valve to open direction to increase thevehicle speed, and the speed when the RES/ACC SW is operated to off is memorized, and the vehicle speed is controlled atthat speed.Furthermore, every time the RES/ACC SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehicle speed isincreased by approx. 1.6 km/h (1.0 mph).
MANUAL CANCEL MECHANISMIf any of the following signals are input during cruise control traveling, the current to the motor flows in the direction to closethe throttle valve, and cancel the cruise control.(1) Stop lamp SW is on (Brake pedal is depressed)
(2) The CANCEL SW of the control SW is on
(3) CRUISE SW is off
RESUME CONTROLAfter canceling the cruise control (Except when the main SW is off) if the vehicle speed is above the minimum speed limit(Approx. 40km/h, 25mph), operating the RES/ACC SW to on from off will cause the system to accelerate and resume to thevehicle speed before manual cancellation.
OVERDRIVE FUNCTIONThe overdrive may be cut on an uphill grade, while traveling with the cruise control.After the overdrive is cut, if the vehicle speed reaches the overdrive resume speed (Set speed minus 2 km/h (1.2 mph) ), andif the system determines that the uphill grade has finished, the overdrive will resume after the overdrive timer operation.
AUTO CANCEL OPERATIONIf any of the following conditions are detected, the set speed is erased and the control is canceled.(1) Disconnection and/or short in the stop light SW(2) Malfunction in the vehicle speed signal(3) Malfunction in the electronic throttle parts(4) Malfunction in the stop light SW input circuit(5) Malfunction in the cancel circuit(6) The actual vehicle speed becomes slower than the minimum speed limit(7) The actual vehicle speed becomes –16 km/h (10 mph) slower than the set speed
E3 (A), E4 (B), E6 (D), E7 (E) ENGINE CONTROL MODULEIGSW–E1 : 9.0–14.0 volts with ignition SW at ON or ST positionBATT–E1 : Always 9.0–14.0 voltsSTP–E1 : 7.5–14.0 volts with brake pedal depressed
: Below 1.5 volts with brake pedal released
C16 CRUISE CONTROL SW [COMB. SW]5–3 : Approx. 1540Ω with CANCEL SW on
Approx. 240Ω with RES/ACC SW onApprox. 630Ω with SET/COAST SW on
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
163
: PARTS LOCATION
Code See Page Code See Page Code See Page
A20 34 E4 B 34 J9 35
C11 A 34 E5 C 34 J10 35
C12 B 34 E6 D 34 J18 31 (2UZ–FE)
C13 C 34 E7 E 34 P1 31 (2UZ–FE)
C16 34 J1 31 (2UZ–FE) S4 35
D8 34 J5 35 T2 31 (2UZ–FE)
E3 A 34 J8 35 V2 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
1D26 (*1)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
II1 46 Cowl Wire and Cowl Wire (Instrument Panel Reinforcement RH)
: GROUND POINTS
Code See Page Ground Points Location
EA 40 (2UZ–FE) Front Left Fender
EB 40 (2UZ–FE) Rear Bank of Right Cylinder Head
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire I5 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
164
CRUISE CONTROL (5VZ–FE)
B
2
100A
ALT
1
2
1
40A
AM
1
2
22
15A
EFI
NO
. 1
1
2
2 4AM1
ACC
IG1
1 5
2 3
2 2
2 2
EA
A
A
B
B
W–L
W–B
IA414
JUN
CTI
ON
CO
NN
EC
TOR
J 1
1I2
10AGAUGE
1F9
IA415
JUN
CTI
ON
CO
NN
EC
TOR
J18
A16
BATT
IA46
A4
MREL
A1
+B
ENGINE CONTROL MODULE
BE 3 , E 4A C, E 5 D, E 6 E, E 7
E6
ME01 E04
8 E D17
E1 E01
4 E E5
E02 E03
7 E
ED
BATTERY
WB–R
B–Y
B–R
B–R
B–Y
B–Y
B–R
B–Y
B–R
B–Y
B–Y
B–Y
W–L
W–L
W–L
BR
W–B BR
W–B
W–B
W–BW
–B
IGNITION SWI23
EFIRELAY
1F5B
–Y
B–Y
8 1F
B–Y
B–Y
2003 TOYOTA TUNDRA (EWD491U)
165
ENGINE CONTROL MODULE
BE 3 , E 4A C, E 5 D, E 6 E, E 7
B25
D
2
1
E
E
JUN
CTI
ON
CO
NN
EC
TOR
J 8
CR
UIS
E C
ON
TRO
LC
LUTC
H S
W
C18
IE215
D
3
5A
A
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
15AACC
1G11
2
1 3
IE14
JUN
CTI
ON
CO
NN
EC
TOR
J 9P
AR
K/N
EU
TRA
LP
OS
ITIO
N S
W
P 1
W–R CC
5AIGN
1F11
B9
ST1–
B
B
A15
IGSW
B
JUNCTIONCONNECTOR
J 5
STO
P L
IGH
T S
WS
4
DIO
DE
( A/T
)D
8
C10
VPA
C15
VPA2
3 4 1
VPA VPA2 VC
E15
VTA
C4
VTA2
3 2 4
VTA VTA2 VC
E11
E2
2 1
E25
VC
E2E2
ACCEL PEDALSENSOR
A 8THROTTLE POSITIONSENSOR
T 2
E9
M+
C2
CL+
2 3 4
M+ CL+ CL–
C8
CL–
E31
M–
1
M–
THROTTLE CONTROL MOTORT 1
E17
GE01
B–Y
B–Y
L–B
B–Y
W–R
W–R
W–R
L–B
GR B–O
L–B
B–Y GR B
–O
B–O
L–RJUNCTION
CONNECTOR
J12
( M/T
)( M
/T)
(A/T)
( A/T
)( A
/T)
( A/T
)
( A/T
)( A
/T)
R–W R
G–B
G–B
G–B
B–W
B–W
B–W
B–Y
R–B
R G
Y L
G–B ( SH
IELD
ED
)
( SH
IELD
ED
)
BR
I 3 I 3
I 3
1 4
2 3
15ASTOP
1F2
G–W
A20
STP
G–W
G–WJ10JUNCTIONCONNECTOR
1D
4
1D
1C
C
G–W
B–Y B–Y
B–YB–Y
E
B–Y
( A/T
)
( A/T
)
2003 TOYOTA TUNDRA (EWD491U)
166
CRUISE CONTROL (5VZ–FE)
ENGINE CONTROL MODULE
BE 3 , E 4A C, E 5 D, E 6 E, E 7
15AETCS
2
A8
+BM
CCS
ECC
CANCEL
SET/COAST
RES/ACC
CRUISE
B22
CCS
ED
5
4
G
BR
BR
CRUISE CONTROL SW[COMB. SW]
C16
IA51
W–G
B–Y
CR
UIS
E
C3 A9
C9
SP
EE
DO
ME
TE
R
A6
D
D
G–O
B–Y
G–O
W–G
G–O
SP1
JUNCTIONCONNECTOR
J 9
C2C13
A17
Y
Y
32
B8
IH
BR
C
C
BR
IE23IE36
IE225IE34
P–L
G–B
P–L
G–B
(A/T)(M/T)
VEHICLE SPEED SENSOR(COMBINATION METER)
V 2
JUN
CTI
ON
CO
NN
EC
TOR
J 8
PI
CO
MB
INA
TIO
N M
ET
ER
CC
11A
, C
13
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
IE117
B–Y
1 B–Y
IE12
B–Y
B–Y
2003 TOYOTA TUNDRA (EWD491U)
167
The cruise control system is a constant vehicle speed controller which controls the opening angle of the engine throttle valveby the SW, and allows driving at a constant speed without depressing the accelerator pedal.
SET CONTROLWhen the SET/COAST SW is operated while traveling with the main SW on, the speed when the SET/COAST SW isoperated to off is memorized, and the vehicle speed is controlled at that speed.
COAST CONTROLWhen the SET/COAST SW is operated to on, the cruise control opening angle requirement is turned to 0 to decrease thevehicle speed, and the speed when the SET/COAST SW is operated to off is memorized, and the vehicle speed is controlledat that speed.Furthermore, every time the SET/COAST SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehiclespeed is decreased by approx. 1.6 km/h (1.0 mph).
ACCEL CONTROLWhen the RES/ACC SW is operated to on, the throttle motor rotates the throttle valve to open direction to increase thevehicle speed, and the speed when the RES/ACC SW is operated to off is memorized, and the vehicle speed is controlled atthat speed.Furthermore, every time the RES/ACC SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehicle speed isincreased by approx. 1.6 km/h (1.0 mph).
MANUAL CANCEL MECHANISMIf any of the following signals are input during cruise control traveling, the current to the motor flows in the direction to closethe throttle valve, and cancel the cruise control.(1) Stop lamp SW is on (Brake pedal is depressed)
(2) The CANCEL SW of the control SW is on
(3) CRUISE SW is off
RESUME CONTROLAfter canceling the cruise control (Except when the main SW is off) if the vehicle speed is above the minimum speed limit(Approx. 40km/h, 25mph), operating the RES/ACC SW to on from off will cause the system to accelerate and resume to thevehicle speed before manual cancellation.
OVERDRIVE FUNCTIONThe overdrive may be cut on an uphill grade, while traveling with the cruise control.After the overdrive is cut, if the vehicle speed reaches the overdrive resume speed (Set speed minus 2 km/h (1.2 mph) ), andif the system determines that the uphill grade has finished, the overdrive will resume after the overdrive timer operation.
AUTO CANCEL OPERATIONIf any of the following conditions are detected, the set speed is erased and the control is canceled.(1) Disconnection and/or short in the stop light SW(2) Malfunction in the vehicle speed signal(3) Malfunction in the electronic throttle parts(4) Malfunction in the stop light SW input circuit(5) Malfunction in the cancel circuit(6) The actual vehicle speed becomes slower than the minimum speed limit(7) The actual vehicle speed becomes –16 km/h (10 mph) slower than the set speed
E3 (A), E4 (B), E6 (D), E7 (E) ENGINE CONTROL MODULEIGSW–E1 : 9.0–14.0 volts with ignition SW at ON or ST positionBATT–E1 : Always 9.0–14.0 voltsSTP–E1 : 7.5–14.0 volts with brake pedal depressed
: Below 1.5 volts with brake pedal released
C16 CRUISE CONTROL SW [COMB. SW]5–3 : Approx. 1540Ω with CANCEL SW on
Approx. 240Ω with RES/ACC SW onApprox. 630Ω with SET/COAST SW on
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
168
CRUISE CONTROL (5VZ–FE)
: PARTS LOCATION
Code See Page Code See Page Code See Page
A8 32 (5VZ–FE) E5 C 34 J10 35
C11 A 34 E6 D 34 J12 35
C13 C 34 E7 E 34 J18 33 (5VZ–FE)
C16 34 I23 35 P1 33 (5VZ–FE)
C18 34 J1 33 (5VZ–FE) S4 35
D8 34 J5 35 T1 33 (5VZ–FE)
E3 A 34 J8 35 T2 33 (5VZ–FE)
E4 B 34 J9 35 V2 33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1D22 (*2)
1D26 (*1)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
1G26 (*1)
1I22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1I26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
: GROUND POINTS
Code See Page Ground Points Location
EA 42 (5VZ–FE) Front Left Fender
ED 42 (5VZ–FE) Intake Manifold Left
IH 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
169
SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionaryinstructions and the procedure and precautions in the Repair Manual for the applicable model year.
Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of informationwhen troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.
Work must be started after 90 seconds from when the ignition switch is turned to the ”LOCK” position and thenegative (–) terminal cable is disconnected from the battery.(The SRS is equipped with a back–up power source so that if work is started within 90 seconds fromdisconnecting the negative (–) terminal cable of the battery, the SRS may be deployed.)
When the negative (–) terminal cable is disconnected from the battery, the memory of the clock and audio system will becanceled. So before starting work, make a record of the contents memorized in the audio memory system. When work isfinished, reset the audio systems as they were before and adjust the clock. To avoid erasing the memory in eachmemory system, never use a back–up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
Do not expose the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensorassembly or front airbag sensor assembly directly to hot air or flames.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbagassembly, seat belt pretensioner, center airbag sensor assembly and front airbag sensor assembly should be inspected.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, centerairbag sensor assembly or front airbag sensor assembly in order to reuse it.
If the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensor assembly orfront airbag sensor assembly has been dropped, or if there are cracks, dents or other defects in the case, bracket orconnector, replace them with new ones.
Use a volt/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the system’s electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
After work on the SRS is completed, perform the SRS warning light check.
If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the RepairManual.
2003 TOYOTA TUNDRA (EWD491U)
170
SRS
15AACC
1G10
B13
1 2
A2 A3
AIRBAG SQUIB(FRONT PASSENGER AIRBAG ASSEMBLY)
A16
P 3
PASSENGER AIRBAGMANUAL ON–OFF SW
BA , P 4
A1
B1
A3 B1
I24
INTE
GR
AT
ION
CO
NTR
OL
AN
D P
AN
EL
BA
, I2
5
B14
SPIRALCABLE
B13B10B11
A1A4
AIRBAG SQUIB(STEERING WHEEL PAD)
A17
21 21
IE IH
A
II
J13JUNCTIONCONNECTOR
A2 A1 C5 C6B27 B28
W–B
W–B
Y–B Y
Y–B Y
B2
W–B
Y–R
Y–G
Y–B Y
W–B R
Y–G
Y–R
GR
1 2
C 4
CENTER AIRBAG SENSOR ASSEMBLY
BA , C 5
P– P+ D+ D–
E1 E2 PL+ PL– PR+ PR–
SQB+ SQB–
E IND ECU– ECU+
PRETENSIONER LHP13
PRETENSIONER RHP14W
–B
R
W–B
C, C 6
ACC GND1
PIND GND
FROM POWER SOURCE SYSTEM(SEE PAGE 56)
RBE+
C8
B–L
3
SEAT BELT WARNINGOCCUPANT DETECTION SENSOR
S 5
2003 TOYOTA TUNDRA (EWD491U)
171
5AIGN
1M3
B5
B15
B
2 1
A
CONNECTIONDETECTIONPIN
B
2 1
A
CONNECTIONDETECTIONPIN
B26 B9 B20
IA11
W–R
W–R
IA12
BR
BR
B–W
BR
–W
B12 B19
D
D
D
D
W
W–G
W
A
A
10ADOME
2
B3
L–Y
B–Y
B–Y
A
B–O
B–YJUNCTIONCONNECTOR
J 5
JUN
CT
ION
CO
NN
EC
TO
R
J 8
7
SIL
DATA LINK CONNECTOR 3D 6
AIRBAG SENSORFRONT LH
A11AIRBAG SENSORFRONT RH
A12
IG2 LA
SL+ SL– SR+ SR– SIL TC
C 4 , A BC 5
CENTER AIRBAG SENSOR ASSEMBLY
C, C 6
FROM POWER SOURCE SYSTEM(SEE PAGE 56)* 2 : BENCH SEAT* 3 : SEPARATE SEAT, CAPTAIN SEAT (W/O POWER SEAT)
13
TC
JUN
CT
ION
CO
NN
EC
TO
R
J 5
W–G
LBE+
A11
B
B
B
B
BI13
B
B2 (*2)A1 (*1)
A2 (*1)
B1 (*2)
W–B
BI14
IE
JUNCTIONCONNECTOR
J10
A/B
11
B–Y
* 1 : W/ POWER SEAT
BB
7,
A
BU
CK
LE S
W L
HB
( *1,
*2)
( *1,
*2)
W–B
C3
C4
W–B
( *3)
B 7
C
BU
CK
LE S
W L
H
B ( *3)
1
2
B5
1F3
1E6
L–Y
C10
SRS WARNING LIGHT[COMB. METER]
CC12 , C13B
GSW2
B23
A14A21
F/PS
II11
R–B
( 2U
Z–FE
)
R–B
( 2U
Z–FE
)
ENGINE CONTROLMODULE
E 3 A
R–B
( 5V
Z–F
E)
L–Y
(*1, *2)
(2UZ–FE)(5VZ–FE)
2003 TOYOTA TUNDRA (EWD491U)
172
SRS
The SRS is a driver protection device which has a supplemental role to the seat belts.When the ignition SW on, the current from the IGN fuse flows to TERMINAL (B) 5 of the center airbag sensor assembly.If an accident occurs while driving, deceleration caused by a frontal impact is detected (by sensor) and when the frontalimpact exceeds a set level, the current from the IGN fuse flows to TERMINAL (B) 5 of the center airbag sensor assembly.This current flows to TERMINAL (B) 14, (A) 2, (C) 5 to TERMINAL 1 of the airbag squib (Steering wheel pad) andPretensioners to TERMINAL 2 to TERMINAL (B) 13, (A) 1, (C) 6 of the center airbag sensor assembly, and also flows toTERMINAL (B) 11 of the center airbag sensor assembly to TERMINAL (A) 4 of the passenger airbag manual On–Off SW toTERMINAL (A) 2 to TERMINAL 1 of the airbag squib (Front passenger airbag assembly) to TERMINAL 2 to TERMINAL (A)3 of the passenger airbag manual On–Off SW to TERMINAL (A) 1 to TERMINAL (B) 10 of the center airbag sensorassembly. Furthermore, the current flows to TERMINAL (B) 27 or (B) 28 to GROUND, causing the center airbag squibs toexpand.When the safing sensor built into the center airbag sensor assembly is on, airbag sensor is off and the current from the IGNfuse flows same as above–mentioned flowing, causing the airbag squibs to expand. When the safing sensor built into thecenter airbag sensor assembly is on, the airbag sensor on one of the above-mentioned circuits is activated so that currentflows to the airbag squibs and causes them to operate.The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.The airbag stored inside the passenger’s instrument panel is instantaneously expanded to soften the shock to thepassenger.
1. FRONT PASSENGER AIRBAG ON/OFF OPERATIONWhen the passenger airbag manual On–Off SW is on, the current flowing from the IGN fuse to the airbag squib (Frontpassenger airbag assembly) is same as above, causing the airbag squib (Front passenger airbag assembly) to expand in anaccident.If the passenger airbag manual On–Off SW is turned to off, the current flows from the ACC fuse to TERMINAL (B) 13 of thepassenger airbag OFF indicator (Integration control and panel) to TERMINAL (A) 3 to TERMINAL (B) 2 of the airbag manualOn–Off SW to TERMINAL (B) 1 to TERMINAL (A) 1 of the integration control and panel to TERMINAL (B) 1 to GROUND,lighting the indicator up. Then the current between TERMINAL (B) 11 of the airbag sensor assembly and the airbag squib(Front passenger airbag assembly) is cut off, so that it does not expand the airbag squib (Front passenger airbag assembly)in an accident.
: PARTS LOCATION
Code See Page Code See Page Code See Page
A1130 (2UZ–FE) C4 A 34 J10 35
A1132 (5VZ–FE) C5 B 34 J13 35
A1230 (2UZ–FE) C6 C 34 P3 A 35
A1232 (5VZ–FE) C12 B 34 P4 B 35
A16 34 C13 C 34P13
36 (Access Cab)
A17 34 D6 34P13
37 (Standard Cab)
A 38 (w/ Power Seat) E3 A 34P14
36 (Access Cab)
B36 (Access Cab *3) I24 A 35
P1437 (Standard Cab)
B7B
37 (Standard Cab *3) I25 B 35S5
36 (Access Cab)
C36 (Access Cab *4) J5 35
S537 (Standard Cab)
C37 (Standard Cab *4) J8 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
173
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1M22 (*2)
1M26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
II1 46 Cowl Wire and Cowl Wire (Instrument Panel Reinforcement RH)
48 (Access Cab)
BI1 50 (Standard Cab) Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
52
( )
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
174
4WD (2UZ–FE)
15AACC
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G11
10AGAUGE
1F9 1F8 1F5
3
A
A
E
E
IE126
IE110
C
A9
C2 C13 B8 C3
IE117 IE19IE17
C
C
D
D
IH
B10 B11 A8 D1
4HI 4LO
GR
B–Y
B–Y
B–Y
JUN
CTI
ON
CO
NN
EC
TOR
J 8
DIODE(A/T)
D 8
GR
GR
B–Y( *
1)
( *2)
( *1)
1
2
L–B
L–B
LG–B
C
BR
R–L
P–L BR
G–O
Y–B
Y–B
BR
–Y BR–Y
JUN
CTI
ON
CO
NN
EC
TOR
J 9
JUN
CTI
ON
CO
NN
EC
TOR
J 8
VEHICLESPEED SENSOR(COMBINATION METER)
V 2
LG–B
B–Y
B–Y
R–L
P–L
3 2
1
G–O
BR–Y
Y–B
Y–B
G–O
LG–B
JUNCTIONCONNECTOR
J11
NE
UTR
AL
PO
SIT
ION
SW
[PA
RK
/NE
UT
RA
L P
OS
ITIO
N S
W]
P 1
LG–B
5
3
SP
EE
DO
ME
TE
R
C11
COMBINATION METER
BA , C12 C, C13
JUN
CTI
ON
CO
NN
EC
TOR
J 9
D, C14
2003 TOYOTA TUNDRA (EWD491U)
175
20A4WD
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1J1
12 4WD CONTROL ECUF 7
B3 B2 B1
A4 A5
I 4
II
BR–Y
Y–B
Y–B
G–O
LG–B
BR–Y
IE2
2
I 3
1
2
IE224
D
D
1
2
I 3
IE23
JUNCTION CONNECTORJ12
B–Y
20 7 4 21 3 5 25 18 6
BR
–Y
G–Y P
Y–B
G–O
LG–B
W–B
L–R
G–R
D D
L–R
L–R
L–R
14
DE
TE
CTI
ON
SW
( TR
AN
SFE
R L
4 P
OS
ITIO
N)
D 4
DE
TE
CTI
ON
SW
( TR
AN
SFE
R 4
WD
PO
SIT
ION
)
D 3
G–R
W–B
W–BW–BW–B
W–B
W–B
G–Y P
I24
INTE
GR
AT
ION
CO
NTR
OL
AN
D P
AN
EL
BA
, I2
5
W–B
W–B
L4
* 1 : W/ DOOR LOCK CONTROL* 2 : W/O DOOR LOCK CONTROL
H–L 2–4
IND2 IND1 GND
A
JUNCTIONCONNECTOR
J13
W–B
EXI3
IG
IND2 H–L 2–4 IND1 SPD N GND L4 4WD
4
ENGINECONTROLMODULE
E 4ABSACTUATORWITH ECU
A 5
L–R
2003 TOYOTA TUNDRA (EWD491U)
176
4WD (2UZ–FE)
I 3
IE114
EC11
ED11
GR
GR
GR
GR
3
IE217
EC14
ED12
LGLG
LGLG
6
IE29
EC14
ED14
R–W
R–W
R–W
R–W
2
IE216
EC13
ED13
R–B
R–B
R–B
R–B
5
IE28
EC15
ED15
RR
RR
1
10 23 11 2419
4WD CONTROL ECUF 7
W–B W–B
4ADD ACTUATORA 9
IE212IE213 IE226 IE220 IE221
13
GG
1
26
YY
8
B–R
B–R
3
9
B–W
B–W
5
22
LW
6
W–B
W–B
4
ED16
W–B
ADD DL1 DL2 DM1 DM2 TM1TM2 TL1 TL3 TL2
MM
W–B
TRANSFER SHIFTACTUATOR
T 3
H2
H4
L4
2
DE
TE
CTI
ON
SW
EC16
GR
FRO
M E
NG
INE
CO
NTR
OL
MO
DU
LE
GR
I 3
2003 TOYOTA TUNDRA (EWD491U)
177
In the conventional system, the 2–4 select SW and the transfer shift lever was used to shift the mode between H–L. In thissystem, the transfer shift lever is not used, and the H–L mode shift can be done by the transfer shift actuator.The mode can be changed by the touch select 2–4 SW and touch select high–low in the integration control and panel.The shift range is controlled according to the vehicle speed sensor and Park/Neutral position SW, and the indicator light isturned ON to inform the driver if any of the following conditions are detected:∗ The shift is not completed even though 3 seconds have elapsed after transfer operation.∗ The vehicle speed is above approximately 100 km/h (63 mph) when shifting from H2 to H4.∗ The vehicle speed is below approximately 5 km/h (3 mph) or the A/T shift lever is in a position other than N position, when
shifting from H4 to L4 or visa versa, and from L4 to H2.
TRANSFER OPERATIONH2 to H4When the touch select 2–4 SW in the integration control and panel is turned ON, a signal is input into TERMINAL 4 of the4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 13 to transfer shiftactuator TERMINAL 1 to motor to TERMINAL 2 to 4WD control ECU TERMINAL 26 to GROUND, and the transfer shifts to4WD (H4 position.)When the system shifts to 4WD, the detection SW (Transfer 4WD position) is turned ON, and the current flows from 4WDcontrol ECU TERMINAL 11 to ADD actuator TERMINAL 5 to motor to TERMINAL 1 to 4WD control ECU TERMINAL 24 toGROUND, and the ADD actuator is activated, and the ADD is connected. When the ADD is connected, the detection SW(ADD position SW) is turned ON, and the 4HI Indicator light comes ON.H4 to H2When the touch select 2–4 SW in the integration control and panel is turned OFF, a signal is input into TERMINAL 4 of the4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 26 to transfer shiftactuator TERMINAL 2 to motor to TERMINAL 1 to 4WD control ECU TERMINAL 13 to GROUND, and the transfer shifts to2WD (H2 position.)When the system shifts to 2WD, the detection SW (Transfer 4WD position) is turned OFF, and the current flows from 4WDcontrol ECU TERMINAL 24 to ADD actuator TERMINAL 1 to motor to TERMINAL 5 to 4WD control ECU TERMINAL 11 toGROUND, and the ADD actuator is activated, and the ADD is disconnected. When the ADD is disconnected, the detectionSW (ADD position SW) is turned OFF, and the 4HI indicator Light turns OFF.H4 to L4When the touch select high–low SW in the integration control and panel is turned ON, a signal is input into TERMINAL 7 ofthe 4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 13 to transfer shiftactuator TERMINAL 1 to motor to TERMINAL 2 to 4WD control ECU TERMINAL 26 to GROUND, and the transfer shifts to4WD LO position (L4 position.)The 4HI Indicator is turned OFF and the 4LO indicator is turned ON.L4 to H4When the touch select high–low SW in the integration control and panel is turned OFF, a signal is input into TERMINAL 7 ofthe 4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 26 to transfer shiftactuator TERMINAL 2 to motor to TERMINAL 1 to 4WD control ECU TERMINAL 13 to GROUND, and the transfer shifts to4WD HI position (H4 Position.)The 4HI indicator is turned ON and the 4LO indicator is turned OFF.The shift is not completed even though 3 seconds have elapsed after transfer operation.∗ The vehicle speed is above approximately 100 km/h (63 mph) when shifting from H2 to H4.∗ The vehicle speed is below approximately 5 km/h (3 mph) or the A/T Shift Lever is in a position other than N position,
when shifting from H4 to L4 or visa versa, and from L4 to H2.L4 to H2When the touch select 2–4 SW in the integration control and panel is turned OFF, a signal is input into TERMINAL 4 of the4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 26 to transfer shiftactuator TERMINAL 2 to motor to TERMINAL 1 to 4WD control ECU TERMINAL 13 to GROUND, and the detection SW(Transfer L4 position) is turned OFF.Furthermore, the motor rotates to shift the transfer to 2WD (H2 position.)When the system shifts to 2WD, the detection SW (Transfer 4WD position) is turned OFF, and the current flows from 4WDcontrol ECU TERMINAL 24 to ADD actuator TERMINAL 1 to motor to TERMINAL 5 to 4WD control ECU TERMINAL 11 toGROUND, and the ADD actuator is activated, and the ADD is disconnected. When the ADD is disconnected, the detectionSW (ADD position SW) is turned OFF, and the 4LO indicator light turns OFF.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
178
4WD (2UZ–FE)
H2 to L4When the touch select 2–4 SW in the integration control and panel is turned ON, and the touch select high–low SW is turnedON, a signal is input into TERMINAL 4 of the 4WD control ECU.The 4WD control ECU is activated by this, and the current flows from the 4WD control ECU TERMINAL 13 to transfer shiftactuator TERMINAL 1 to motor to TERMINAL 2 to 4WD control ECU TERMINAL 26 to GROUND, and the transfer shifts to4WD (H4 position.)When the system shifts to 4WD, the detection SW (Transfer 4WD position) is turned ON, and the current flows from 4WDcontrol ECU TERMINAL 11 to ADD actuator TERMINAL 5 to motor to TERMINAL 1 to 4WD control ECU TERMINAL 24 toGROUND, and the ADD actuator is activated, and the ADD is connected. Then a signal is input into TERMINAL 7 of the4WD control ECU and the 4WD control ECU is activated by this, so the current flows from the 4WD control ECU TERMINAL13 to transfer shift actuator TERMINAL 1 to motor to TERMINAL 2 to 4WD control ECU TERMINAL 26 to GROUND. Thetransfer shifts to 4WD LO position (L4 position), and the 4LO indicator light comes ON.
F7 4WD CONTROL ECU12–GROUND : Approx. 12 volts with ignition SW at ON or ST position25–GROUND : Always continuity
3–GROUND : 4 pulses with 1 rotation4–GROUND : 2 volts or less with touch select 2–4 SW on
18–GROUND : 2 volts or less with detection SW (Transfer L4 position) on and transfer shift lever at L4 position
I24 (A), I25 (B) INTEGRATION CONTROL AND PANEL(A) 5–(B) 1 : Closed with touch select 2–4 SW on
P1 NEUTRAL POSITION SW [PARK/NEUTRAL POSITION SW]3–5 : Closed with A/T shift lever at N position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A5 30 (2UZ–FE) D4 30 (2UZ–FE) J9 35
A9 30 (2UZ–FE) D8 34 J11 35
C11 A 34 E4 34 J12 35
C12 B 34 F7 35 J13 35
C13 C 34 I24 A 35 P1 31 (2UZ–FE)
C14 D 34 I25 B 35 T3 31 (2UZ–FE)
D3 30 (2UZ–FE) J8 35 V2 31 (2UZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
1F26 (*1)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EC1 40 (2UZ–FE) Engine No.2 Wire and Engine Wire (Near the Starter)
ED1 40 (2UZ–FE) Engine No.2 Wire and Differential Wire (Near the Transmission)
IE146 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE246 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
179
: GROUND POINTS
Code See Page Ground Points Location
IH44 Right Kick Panel
II44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire I4 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
180
4WD (5VZ–FE)
1
2
20A4WD
1J1
C
C
IE16
IE35IE21
A
II
J13JUNCTIONCONNECTOR
IE28IE31
C
2 4 10 1 5
EG15
M
IE220IE39
IE29IE32
IE118IE118
EG14
RR
R–W
LGLGR
R–B
R–B
R–W
R–W
EG13 EG12
R–B LG
1 2 5 6
EG11
3
I 4 IE1
7
D
D
4WD L4
D
I 3
2
1
W–B
W–B
IE213
D
D
TFN
DE
TEC
TIO
N S
W( T
RA
NS
FER
4W
D P
OS
ITIO
N)
D 3
JUNCTIONCONNECTOR
J11(A/T)(M/T)
B–R
B–R
W W
W
W
W
TRANSMISSIONCONTROL RELAY
T 4
7 9 3
W–B
(A/T)(M/T)
W–B
W–B
W–B W–B
W–B
W–B
4ADD ACTUATORA 9
W–B
W–B
GR
DETECTION SW(TRANSFER L4 POSITION)
D 4
L–R
(M/T)
JUN
CTI
ON
CO
NN
EC
TOR
J10
GR
GR
GR
GR
L–R
( A/T
)
L–R
( A/T
)
D
JUN
CT
ION
CO
NN
EC
TO
R
J12
L–R
(A/T)
GR
L–R
( A/T
)
R–Y
(A/T)
C
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
EG16
W
IE217
GR
( A/T
)
GR
( A/T
)
( M/T
)
IE310
GR
( M/T
)
( M/T
)
213
11ENGINE CONTROLMODULE
E 4
2003 TOYOTA TUNDRA (EWD491U)
181
14
B
B
2
1
IE224
I 3
A9D4
D2 B10
B
IE14
15AACC
1G11
10AGAUGE
1F5
A
A
IE221
1F9
W–B
GR
W–B
L–R
(M/T)
L–R
(A/T)
R–Y
(A/T)
EXI
ABS ACTUATOR WITHECU
A 5
L–R
( M/T
)
L–R
( M/T
)
R–Y
JUN
CTI
ON
CO
NN
EC
TO
R
J 9
R–Y
( A/T
)
R–Y
( A/T
)
R–Y
( A/T
)
W–B
( A/T
)
DE
TEC
TIO
N S
W( T
RA
NS
FER
NE
UTR
AL
PO
SIT
ION
)
D 5
R–Y
GR
(A/T)
A/T
P
4WD
L–Y
B–Y
L–Y
L–B
L–B
2
3 1
DIODE(A/T)
D 8
GR
( *1)
B–Y
GR
( *1)
B–Y
B–Y
E
E
JUNCTIONCONNECTOR
J 8
* 1 : W/ DOOR LOCK CONTROL* 2 : W/O DOOR LOCK CONTROL
GR
( *2)
3
NE
UT
RA
L P
OS
ITIO
N S
W[P
AR
K/N
EU
TRA
L P
OS
ITIO
N S
W]
P 1
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1
JUNCTIONCONNECTOR
J 9
( A/T
)
IE37
COMBINATIONMETER
BC11 , C12A D, C14
2003 TOYOTA TUNDRA (EWD491U)
182
4WD (5VZ–FE)
P1 NEUTRAL POSITION SW [PARK/NEUTRAL POSITION SW]3–1 : Closed with A/T shift lever at P position
D5 DETECTION SW (TRANSFER NEUTRAL POSITION)1–2 : Closed with transfer position at N position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A5 32 (5VZ–FE) D4 32 (5VZ–FE) J10 35
A9 32 (5VZ–FE) D5 32 (5VZ–FE) J11 35
C11 A 34 D8 34 J12 35
C12 B 34 E4 34 J13 35
C14 D 34 J8 35 P1 33 (5VZ–FE)
D3 32 (5VZ–FE) J9 35 T4 35
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
1F26 (*1)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EG1 42 (5VZ–FE) Engine Wire and Differential Wire (Front Differential Upper Side)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
: GROUND POINTS
Code See Page Ground Points Location
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 46 Engine Wire I4 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
183
MEMO
2003 TOYOTA TUNDRA (EWD491U)
184
DOOR LOCK CONTROL (w/ DAYTIME RUNNING LIGHT)
E
5 1F
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
10AGAUGE
2
1
A7 B2 C1
E
IB39 IB38IB47
D22 2
31
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W L
H
LOC
K
UN
LOC
K
UN
LOC
K
LOC
K
2 5
1
B 3
A9
C11
COMBINATIONMETER
BA , C12 C, C13
R–Y
G–B
L–R
P–B
Y–B
W–B
G–B
R–Y
R–Y
L–R
G–B
W–G
W–B
E
D C
D C
UN
LOC
K W
AR
NIN
GS
W
U 1
JUN
CT
ION
CO
NN
EC
TO
R
J 7
P–B
W–B
W–B
L
B–Y
DO
OR
LO
CK
CO
NTR
OL
SW
LH
[PO
WE
R W
IND
OW
MA
ST
ER
SW
]
P10
P–B
B13
L
JUN
CT
ION
CO
NN
EC
TOR
J 4B8
BR
C
C
JUN
CT
ION
CO
NN
EC
TOR
J 8
BR
2
10ADOME
B5
L–Y
1F3
L–Y
2
1
1E6
IB46
D
C R–Y
G–B
W–G
AA
BA BA
IE
W–B
W–B
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
W–B
W–B
B
BW
–G
B W–G
JUN
CTI
ON
CO
NN
EC
TOR
J 7
C
C
JUN
CTI
ON
CO
NN
EC
TOR
J 7
L–R
INTEGRATION RELAY
1N19 1N211N231N201N6
2003 TOYOTA TUNDRA (EWD491U)
185
IF46 IF47
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W R
H
D23
UN
LOC
K
LOC
K
DO
OR
LO
CK
CO
NTR
OL
SW
RH
6 5
3D24
B 7 B 7
A
II
IF31
4 2
1 3
M
4 2
1 3
M
B 3IB34 IF34
A
IF
IB31
IB33 IB35 IF33 IF35
1H8 1H9 1J8
IH
D
D
W–G
R–Y
G–B
R–Y
W–B
W–B
W–B
W–B
L
W–B
W–B
L–W
L–Y
L–W
R–L
L–W
B–Y
W–B BR
L–Y
L–W
L–W
R–L
JUN
CTI
ON
CO
NN
EC
TOR
J 8
W–B
BR L
B–Y
W–B
B–Y
W–B
BR
L
UN
LOC
K
LOC
K
1 3
2
13 12 8
L–Y
W–G
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W L
H
D25
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W R
H
D26
IF39 IF38
R–Y
G–B
JUN
CTI
ON
CO
NN
EC
TOR
J13
W–B W–B
JUN
CT
ION
CO
NN
EC
TO
R
BJ2
1A
, J2
2
B–Y
A D
A D
JUN
CTI
ON
CO
NN
EC
TOR
J 7
R–L
BE
AE AE
L–W
L–Y
R–W
( 2U
Z–FE
)R
–Y
( 5V
Z–FE
)
W–B
INTEGRATION RELAY
AA W–B
1N2410 1N9 1N22 1N
JUN
CT
ION
CO
NN
EC
TO
R
BJ2
1A
, J2
2
BD
AF AF
JUNCTIONCONNECTOR
J 3
T13TVIP ECU
ACT–ACT+B–Y2 4
2003 TOYOTA TUNDRA (EWD491U)
186
DOOR LOCK CONTROL (w/ DAYTIME RUNNING LIGHT)
30APOWER
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1H7 6 1H
E
BE25
BG24
1
C
C
BF25
BH14
B 9
1
2
1
2
1
B 8
BJ
2
1
3
L
B–W
L
E
E CE
JUNCTIONCONNECTOR
J 4JUNCTIONCONNECTOR
J 5
L
B–W
B–W
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
DO
OR
CO
UR
TES
YS
W R
EA
R L
H U
PP
ER
D19
DO
OR
CO
UR
TES
YS
W R
EA
R L
H L
OW
ER
D18
DO
OR
CO
UR
TES
YS
W F
RO
NT
RH
D17
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
B–W ( *1)
B–W ( *1)
( *1)L
L ( *1)
( *2)
B–WL ( *2)
* 2 : STANDARD CAB* 1 : ACCESS CAB
1514
2
1
2
1
B 9
BK
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W R
EA
R R
H U
PP
ER
D21
DO
OR
CO
UR
TES
YS
W R
EA
R R
H L
OW
ER
D20
B–W
(*1)
( *1)
( *1)
( *1)
(* 1)
INTEGRATION RELAY
BE24
BG25
B–W
(*1)
B–W ( *1)
B–W ( *1)
C
2003 TOYOTA TUNDRA (EWD491U)
187
Current always flows to TERMINAL 3 of the integration relay through the POWER fuse.
1. MANUAL LOCK OPERATIONTo push the door lock control SW or door key lock and unlock SW to LOCK position, a lock signal is input to the integrationrelay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 13 to TERMINAL 2 of thedoor lock motors to TERMINAL 3 to TERMINAL 12 of the relay to TERMINAL 8 to GROUND and the door lock motor causesthe door to lock.
2. MANUAL UNLOCK OPERATIONTo push the door lock control SW or door key lock and unlock SW to UNLOCK position, an unlock signal is input to theintegration relay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 12 toTERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 of the relay to TERMINAL 8 to GROUND and thedoor lock motor causes the door to unlock.
3. DOUBLE OPERATION UNLOCK OPERATIONWhen the door key lock and unlock SW LH is turned to unlock position, only the front LH door is mechanically unlocked.Turning the door key lock and unlock SW LH to the unlock side causes a signal to be input to the relay, and if the signal isinput again within 3 seconds by turning the door key lock and unlock SW LH to the unlock side again, current flows fromTERMINAL 12 of the integration relay to TERMINAL 3 of the door lock motors, TERMINAL 2 to TERMINAL 13 of theintegration relay to TERMINAL 8 to GROUND, causing the door lock motors to operate and unlock the doors.
4. KEY CONFINE PREVENTION FUNCTION∗ Operating door lock knob (In door lock motor operation)
With ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using door lock knob (Doorlock motor), the door is locked once but each door is unlocked soon by the function of the integration relay. As a result,current flows from TERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 toTERMINAL 13 of the relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
∗ Operating door lock control SW or door key lock and unlock SWWith ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using the door lock controlSW or door key lock and unlock SW, all doors are locked once but each door is unlocked by the function of the SWcontained in motor, which inputs the signal to the integration relay. According to this input signal, current flows fromTERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 ofthe relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
INTEGRATION RELAY8–GROUND : Always continuity3–GROUND : Always approx. 12 volts
12–GROUND : Approx. 12 volts for 0.2 seconds with following operations∗ Door lock control SW unlocked∗ Door lock control SW locked with ignition key in cylinder and LH or RH door open(Ignition key reminder function)∗ Door lock knob locked with ignition key in cylinder and LH or RH door open. (Ignition key reminder function)∗ Unlocking the LH, RH door cylinder with key
13–GROUND : Approx. 12 volts for 0.2 seconds with following operations∗ Door lock control SW locked∗ Locking the LH, RH door cylinder with key
14–GROUND : Continuity with front LH door open15–GROUND : Continuity with front RH door open (Standard cab)15–GROUND : Continuity with front RH, rear LH, RH door open (Access cab)
D16, D17 DOOR COURTESY SW FRONT LH, RH1–GROUND : Closed with door open
D22, D23 DOOR KEY LOCK AND UNLOCK SW LH, RH1–2 : Closed with door lock cylinder locked with key3–2 : Closed with door lock cylinder unlocked with key
D25, D26 DOOR LOCK MOTOR AND DOOR UNLOCK DETECTION SW LH, RH4–1 : Closed with door lock knob UNLOCK position
U1 UNLOCK WARNING SW1–2 : Closed with key in cylinder
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
188
DOOR LOCK CONTROL (w/ DAYTIME RUNNING LIGHT)
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34 D22 37 (Standard Cab) J7 35
C12 B 34D23
36 (Access Cab) J8 35
C13 C 34D23
37 (Standard Cab) J13 35
D1636 (Access Cab)
D2436 (Access Cab) J21 A 35
D1637 (Standard Cab)
D2437 (Standard Cab) J22 B 35
D1736 (Access Cab)
D2536 (Access Cab) J23 A 35
D1737 (Standard Cab)
D2537 (Standard Cab) J24 B 35
D18 36 (Access Cab)D26
36 (Access Cab)P10
36 (Access Cab)
D19 36 (Access Cab)D26
37 (Standard Cab)P10
37 (Standard Cab)
D20 36 (Access Cab) J3 35 T13 35
D21 36 (Access Cab) J4 35 U1 35
D22 36 (Access Cab) J5 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E 26 (*1) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F
1H 26 (*1)Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J
( )Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB344 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF346 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF446 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE44 Left Kick Panel
IF44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B348 (Access Cab)
Front Door LH WireB7 50 (Standard Cab) Front Door RH Wire
B350 (Standard Cab)
Front Door LH WireB8 48 (Access Cab) Rear Door No.1 Wire LH
B7 48 (Access Cab) Front Door RH Wire B9 48 (Access Cab) Rear Door No.1 Wire RH
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
189
MEMO
2003 TOYOTA TUNDRA (EWD491U)
190
DOOR LOCK CONTROL (w/o DAYTIME RUNNING LIGHT)
E
5 1F
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
10AGAUGE
2
1
A7 B2 C1
E
IB39 IB38IB47
D22
2
31
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W L
H
LOC
K
UN
LOC
K
UN
LOC
K
LOC
K
2 5
1
B 3
A9
C11
COMBINATIONMETER
BA , C12 C, C13
INT
EG
RA
TIO
N R
ELA
Y
R–Y
G–B
L–R
P–B
Y–B
W–B
G–B
R–Y
R–Y
L–R
G–B
W–G
W–B
E
D C
D C
UN
LOC
K W
AR
NIN
GS
W
U 1
JUN
CT
ION
CO
NN
EC
TO
R
J 7
P–B
W–B
W–B
L
B–Y
DO
OR
LO
CK
CO
NT
RO
L S
W L
H[P
OW
ER
WIN
DO
W M
AS
TER
SW
]
P10
P–B
R–YB13
L
CB8
BR
C
C
JUN
CT
ION
CO
NN
EC
TOR
J 8
BR
2
10ADOME
B5
L–Y
1F3L–
Y
2
1
1E6
1L21L11L31L4
IB46
D
C R–Y
G–B
D
W–G
IE
AA
BA BA
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
W–B
B B
2 1
W–G
B
JUNCTIONCONNECTOR
J 7
DIODE(LOCK)
D28 JUNCTIONCONNECTOR
J 4
W–G
G–B
W–G
W–B
W–B
W–B
P–B
C
C
JUN
CTI
ON
CO
NN
EC
TOR
J 7
L–R
2003 TOYOTA TUNDRA (EWD491U)
191
IF46 IF47
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W R
H
D23
UN
LOC
K
LOC
K
DO
OR
LO
CK
CO
NTR
OL
SW
RH
6 5
3D24
B 7 B 7
A
II
IF31
4 2
1 3
M
4 2
1 3
M
B 3IB34 IF34
A
IF
IB31
IB33 IB35 IF33 IF35
1H8 1H9 1J8
INTEGRATION RELAY
W–G
R–Y
G–B
R–Y
W–B
W–B
W–B
W–B
L
W–B
W–B
L–W
L–Y
L–W
R–L
L–W
B–Y
W–B
L–Y
L–W
L–W
R–L
W–B
L
B–Y
W–B
B–Y
W–B
L
W–B
UN
LOC
K
LOC
K
1 3
2
13 12 8
L–Y
R–Y
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W L
H
D25
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W R
H
D26
1L81L9
IF39 IF38
R–Y
G–B
JUNCTIONCONNECTOR
J 3
JUNCTIONCONNECTOR
J13
AA
W–G
AF
BDJUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
L–Y
W–B
A
A
D
D
JUN
CTI
ON
CO
NN
EC
TOR
J 7
BE
AE AE
R–L
JUN
CT
ION
CO
NN
EC
TOR
BJ2
1A
, J2
2
W–B
1 2
DIODE(UNLOCK)
D30
A
A
JUN
CTI
ON
CO
NN
EC
TOR
J 4
R–W
R–W
B–Y
AF
2 4ACT+ ACF
TVIP ECUT13
B–Y
B–Y
2003 TOYOTA TUNDRA (EWD491U)
192
DOOR LOCK CONTROL (w/o DAYTIME RUNNING LIGHT)
30APOWER
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
INTEGRATION RELAY
1H7 6 1H
E
BE25
BG24
1
C
C
BF25
BH14
B 9
1
2
1
2
1
B 8
BJ
2
1
3
L
B–W
L
E
E CE
JUNCTIONCONNECTOR
J 4JUNCTIONCONNECTOR
J 5
LL
B–W
B–W
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
DO
OR
CO
UR
TES
YS
W R
EA
R L
H U
PP
ER
D19
DO
OR
CO
UR
TES
YS
W R
EA
R L
H L
OW
ER
D18
DO
OR
CO
UR
TES
YS
W F
RO
NT
RH
D17
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
B–W ( *1)
B–W ( *1)
( *1)L
( *2)
B–WL ( *2)
* 2 : STANDARD CAB* 1 : ACCESS CAB
1514
2
1
2
1
B 9
BK
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W R
EA
R R
H U
PP
ER
D21
DO
OR
CO
UR
TES
YS
W R
EA
R R
H L
OW
ER
D20
B–W
( *1)
( *1)
( *1)
( *1)
(* 1)
BE24
BG25
B–W C
(*1)
B–W ( *1)
B–W ( *1)
IH
1L16
D
D
BR
JUN
CTI
ON
CO
NN
EC
TOR
J 8
BR
2003 TOYOTA TUNDRA (EWD491U)
193
Current always flows to TERMINAL 3 of the integration relay through the POWER fuse.
1. MANUAL LOCK OPERATIONTo push the door lock control SW or door key lock and unlock SW to LOCK position, a lock signal is input to the integrationrelay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 13 to TERMINAL 2 of thedoor lock motors to TERMINAL 3 to TERMINAL 12 of the relay to TERMINAL 8 to GROUND and the door lock motor causesthe door to lock.
2. MANUAL UNLOCK OPERATIONTo push the door lock control SW or door key lock and unlock SW to UNLOCK position, an unlock signal is input to theintegration relay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 12 toTERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 of the relay to TERMINAL 8 to GROUND and thedoor lock motor causes the door to unlock.
3. DOUBLE OPERATION UNLOCK OPERATIONWhen the door key lock and unlock SW LH is turned to unlock position, only the front LH door is mechanically unlocked.Turning the door key lock and unlock SW LH to the unlock side causes a signal to be input to the relay, and if the signal isinput again within 3 seconds by turning the door key lock and unlock SW LH to the unlock side again, current flows fromTERMINAL 12 of the integration relay to TERMINAL 3 of the door lock motors, TERMINAL 2 to TERMINAL 13 of theintegration relay to TERMINAL 8 to GROUND, causing the door lock motors to operate and unlock the doors.
4. KEY CONFINE PREVENTION FUNCTION∗ Operating door lock knob (In door lock motor operation)
With ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using door lock knob (Doorlock motor), the door is locked once but each door is unlocked soon by the function of the integration relay. As a result,current flows from TERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 toTERMINAL 13 of the relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
∗ Operating door lock control SW or door key lock and unlock SWWith ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using the door lock controlSW or door key lock and unlock SW, all doors are locked once but each door is unlocked by the function of the SWcontained in motor, which inputs the signal to the integration relay. According to this input signal, current flows fromTERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 ofthe relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
INTEGRATION RELAY8–GROUND : Always continuity3–GROUND : Always approx. 12 volts
12–GROUND : Approx. 12 volts for 0.2 seconds with following operations∗ Door lock control SW unlocked∗ Door lock control SW locked with ignition key in cylinder and LH or RH door open(Ignition key reminder function)∗ Door lock knob locked with ignition key in cylinder and LH or RH door open. (Ignition key reminder function)∗ Unlocking the LH, RH door cylinder with key
13–GROUND : Approx. 12 volts for 0.2 seconds with following operations∗ Door lock control SW locked∗ Locking the LH, RH door cylinder with key
14–GROUND : Continuity with front LH door open15–GROUND : Continuity with front RH door open (Standard cab)15–GROUND : Continuity with front RH, rear LH, RH door open (Access cab)
D16, D17 DOOR COURTESY SW FRONT LH, RH1–GROUND : Closed with door open
D22, D23 DOOR KEY LOCK AND UNLOCK SW LH, RH1–2 : Closed with door lock cylinder locked with key3–2 : Closed with door lock cylinder unlocked with key
D25, D26 DOOR LOCK MOTOR AND DOOR UNLOCK DETECTION SW LH, RH4–1 : Closed with door lock knob UNLOCK position
U1 UNLOCK WARNING SW1–2 : Closed with key in cylinder
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
194
DOOR LOCK CONTROL (w/o DAYTIME RUNNING LIGHT)
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34D23
36 (Access Cab) J7 35
C12 B 34D23
37 (Standard Cab) J8 35
C13 C 34D24
36 (Access Cab) J13 35
D1636 (Access Cab)
D2437 (Standard Cab) J21 A 35
D1637 (Standard Cab)
D2536 (Access Cab) J22 B 35
D1736 (Access Cab)
D2537 (Standard Cab) J23 A 35
D1737 (Standard Cab)
D2636 (Access Cab) J24 B 35
D18 36 (Access Cab)D26
37 (Standard Cab)P10
36 (Access Cab)
D19 36 (Access Cab) D28 34P10
37 (Standard Cab)
D20 36 (Access Cab) D30 34 T13 35
D21 36 (Access Cab) J3 35 U1 35
D2236 (Access Cab) J4 35
D2237 (Standard Cab) J5 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E 22 (*2) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F
1H 22 (*2)Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J
( )Cowl Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB344 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF346 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF446 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE44 Left Kick Panel
IF44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B348 (Access Cab)
Front Door LH WireB7 50 (Standard Cab) Front Door RH Wire
B350 (Standard Cab)
Front Door LH WireB8 48 (Access Cab) Rear Door No.1 Wire LH
B7 48 (Access Cab) Front Door RH Wire B9 48 (Access Cab) Rear Door No.1 Wire RH
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
195
MEMO
2003 TOYOTA TUNDRA (EWD491U)
196
TVIP AND WIRELESS DOOR LOCK CONTROL
15ATAIL
2 3
1 5
2 2 2
1C6
1K5
10AHORN
AC
BA
B–L B
B–L B R
R
G–R
R–B
G–Y
G–R
R–B
G–Y
F A
AF
76
JUNCTIONCONNECTOR
J10
JUNCTIONCONNECTOR
BJ21 , J22AJUNCTIONCONNECTOR
J 7
BATTERY
( *2)
( *1)
( *2)
( *1)
H–LPRELAY
R–B
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
INTEGRATIONRELAY
* 3 : W/ DAYTIME RUNNING LIGHT
* 1 : TOWING PACKAGE* 2 : EXCEPT TOWING PACKAGE
* 6 : 5VZ–FE
* 4 : W/O DAYTIME RUNNING LIGHT* 5 : 2UZ–FE
1L1N
53 (*3)
(*4)1L1O
64 (*3)
(*4) 1L1N
134 (*3)
(*4) 1L1N
1212 (*3)
(*4)
2003 TOYOTA TUNDRA (EWD491U)
197
5AECU–B
30APOWER
5AECU IG
1G131C42
AC
BB
IA517
B13 A1 B11 A12 A11 A10
G–R
R–B
G–Y
HORN TAIL HEAD+B1+B2IG
G–R
R–B
G–Y
W–R
W–R
( *6)
W–G
( *5)
W–G
( *6)
B–R
W–R
W–G
W–G
W–R
W–R
W–G
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
3A
, J2
4
( *6)( *
5)
( *5)
( *6)
( *5)
( *5)
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
TVIP ECU
BT11 , T12A C, T13
2
1
AD
ADJUN
CTI
ON
CO
NN
EC
TOR
J21
A
2003 TOYOTA TUNDRA (EWD491U)
198
TVIP AND WIRELESS DOOR LOCK CONTROL
2
1
IB38IB47
D22 2
31
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W L
H
LOC
K
UN
LOC
K
UN
LOC
K
LOC
K
2 5
1
B 3
R–Y
R–Y
R–Y
L–R
W–G
W–G
W–B
CU
NLO
CK
WA
RN
ING
SW
U 1
W–B
W–B
DO
OR
LO
CK
CO
NTR
OL
SW
LH
[PO
WE
R W
IND
OW
MA
ST
ER
SW
]
P10
IB46
C R–Y
W–G
B6 B9A4B8 B10
KSW L2 UL3 UL1 UL2
B2 A2 A7 B18 B17 A6
IA43
IA47
AA AA
BA
AA AA
IE
INDMI–MI+EBZRLUG
L–R
L–R
W–G
P–B
L–WL
W–BV
LG–B
V
W–B
W–B
W–B
W–B
W–B
W–B
P–B
W–G
L–R
CBB CE
123
CBE
24311
SH
OR
T C
ON
NE
CTO
R( T
VIP
)
S 9
TVIP
BU
ZZE
RT1
0
SECURITY INDICATORAND GLASSBREAKAGE SENSORMICROPHONE
S10
JUN
CT
ION
CO
NN
EC
TO
R
BJ2
3,
J24
A
JUNCTIONCONNECTOR
J 7
B2
A7
COMBINATIONMETER
BC11 , C12A
W–G
R–W
(*4)
( *3)
C
TVIP ECU
BT11 , T12A C, T13
(*3)
JUN
CTI
ON
CO
NN
EC
TOR
J 4
R–Y
(*4)
( W/O
TV
IP)
( W/O
TV
IP)
( SH
ILE
DE
D)
BA BA
W–B
W–B
W–B
W–B
Y–B
W–B
2003 TOYOTA TUNDRA (EWD491U)
199
IF47
DO
OR
KE
Y L
OC
K A
ND
UN
LOC
K S
W R
H
D23
UN
LOC
K
LOC
K
DO
OR
LO
CK
CO
NTR
OL
SW
RH
6 5
3D24
B 7 B 7
A
II
IF31
4 2
1 3
M
4 2
1 3
M
B 3IB34 IF34
IB31
IB33 IB35 IF33 IF35
W–G
R–Y
W–G
R–Y
W–B
W–B
W–B
W–B
W–B
W–B
L–W
L–Y
L–W
R–L
L–Y
L–W
L–W
R–L
W–B
B–Y
B–Y
W–B
B–Y
W–B
B–Y
UN
LOC
K
LOC
K
1 3
2
L–Y
JUNCTIONCONNECTOR
J13
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W L
H
D25
DO
OR
LO
CK
MO
TOR
AN
D D
OO
R U
NLO
CK
DE
TEC
TIO
N S
W R
H
D26
IF38
R–Y
IF46
B14 B15 C2C4
AF
BD
LSWD LSWP ACT– ACT+
W–G
R–W
(*4)
A
A
R–W
JUNCTIONCONNECTOR
J 4BE
AE
A
DAD
JUNCTIONCONNECTOR
J 7
R–L
JUNCTIONCONNECTOR
BJ21 , J22A
JUN
CTI
ON
CO
NN
EC
TOR
BJ2
1A
, J2
2
B–Y
B–Y
B–Y
TVIP ECU
BT11 , T12A C, T13
(*3)
1 2 AR–Y
(*4)
R–W
(*4)D30DIODE (UNLOCK)
* 4 : W/O DAYTIME RUNNING LIGHT* 3 : W/ DAYTIME RUNNING LIGHT
W–B
2003 TOYOTA TUNDRA (EWD491U)
200
TVIP AND WIRELESS DOOR LOCK CONTROL
E
BE25
BG24
1
C
C
BF25
BH14
B 9
1
2
1
2
1
B 8
BJ
L
E CE
JUNCTIONCONNECTOR
J 4JUNCTIONCONNECTOR
J 5
L
B–W
B–W
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
DO
OR
CO
UR
TES
YS
W R
EA
R L
H U
PP
ER
D19
DO
OR
CO
UR
TES
YS
W R
EA
R L
H L
OW
ER
D18
DO
OR
CO
UR
TES
YS
W F
RO
NT
RH
D17
( *8)
( *8)
( *8)
( *8)
( *8)
( *8)
( *8)
B–W ( *8)
B–W ( *8)
( *8)L
L ( *8)
( *7)
B–WL ( *7)
2
1
2
1
B 9
BK
B–W
B–W
W–B
W–B
DO
OR
CO
UR
TES
YS
W R
EA
R R
H U
PP
ER
D21
DO
OR
CO
UR
TES
YS
W R
EA
R R
H L
OW
ER
D20
B–W
( *8)
( *8)
( *8)
( *8)
(* 8)
B5B4
BE25
BG24
B–W
B–W
( *8)
( *8)
B–W
(*8)
C
1
2
B
B–L
B–L
B
B–W
DIODE(POWER WINDOW SYSTEM)
D11
CTYDSWD DMLP
6 C
B–W
B–W
TVIP ECU
BT11 , T12A C, T13
C8 C3 B12
SRLY ST A
CUT OFF
GR
FROM ST RELAY
TO PARK/NEUTRAL POSITION SW (A/T)TO CLUTCH START SW OR CLUTCHSTART CANCEL SW (M/T)
G–RP
2003 TOYOTA TUNDRA (EWD491U)
201
10ADOME
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
1A3
1E6
1
2O
FF
ON
DO
OR
B 4
B 4
IC12
1
2
AB AB
BB
1B9
1H1
B–L
B
B–W
B–W
L–Y
L–YL–Y
L–Y
L–Y
L–Y
B–W
B–W
B–W
B
B
B
B
JUNCTIONCONNECTOR
J 4DIODE(TVIP)
D29
INTE
RIO
R L
IGH
TI2
6
PE
RS
ON
AL
LIG
HT
P 8
3
2 1
1A2
1J8
IF
JUNCTIONCONNECTOR
BJ21 , J22A
2
1
W–B
W–B
A
JUNCTIONCONNECTOR
J 3
B
B–W
B–W
* 8 : ACCESS CAB* 7 : STANDARD CAB
2003 TOYOTA TUNDRA (EWD491U)
202
TVIP AND WIRELESS DOOR LOCK CONTROL
T11 (A), T12 (B), T13 (C) TVIP ECU(B) 3–GROUND : Approx. 12 volts with the ignition SW at ON position
(A) 1, (B) 11–GROUND : Always approx. 12 volts(A) 7–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 A 34 D24 37 (Standard Cab) J22 B 35
C12 B 34D25
36 (Access Cab) J23 A 35
D11 34D25
37 (Standard Cab) J24 B 35
D1636 (Access Cab)
D2636 (Access Cab)
P836 (Access Cab)
D1637 (Standard Cab)
D2637 (Standard Cab)
P837 (Standard Cab)
D1736 (Access Cab) D29 34
P1036 (Access Cab)
D1737 (Standard Cab) D30 34
P1037 (Standard Cab)
D18 36 (Access Cab)I26
36 (Access Cab) S9 35
D19 36 (Access Cab)I26
37 (Standard Cab) S10 35
D20 36 (Access Cab) J3 35T10
31 (2UZ–FE)
D21 36 (Access Cab) J4 35T10
33 (5VZ–FE)
D2236 (Access Cab) J5 35 T11 A 35
D2237 (Standard Cab) J7 35 T12 B 35
D2336 (Access Cab) J10 35 T13 C 35
D2337 (Standard Cab) J13 35 U1 35
D24 36 (Access Cab) J21 A 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1B22 (*2)
1B26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1C22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1C26 (*1)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
1G26 (*1)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
1K22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1K26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2)
1N27 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1O27 (*1)
( )
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
203
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IB344 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IC1 44 Cowl Wire and Roof Wire (Left Side of Instrument Panel)
IF346 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF446 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE44 Left Kick Panel
IF44 Left Kick Panel
II 44 Right Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B348 (Access Cab)
Front Door LH Wire B748 (Access Cab)
Front Door RH WireB350 (Standard Cab)
Front Door LH Wire B750 (Standard Cab)
Front Door RH Wire
B448 (Access Cab)
Roof WireB8 48 (Access Cab) Rear Door No.1 Wire LH
B450 (Standard Cab)
Roof WireB9 48 (Access Cab) Rear Door No.1 Wire RH
2003 TOYOTA TUNDRA (EWD491U)
204
POWER WINDOW
5AECU IG
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
30APOWER
2 3
1 59 3 2
1
8
2
1H7 1H6 1C2
1C
1
1J8
POWERRELAY
INTEGRATIONRELAY
BE25
BG24
B 8
2
1
2
11
BJ
C
C
BF25
BH14
B 9 B 9
2
1
2
1 1
BK
L
B–W
L
B–W
B–W
B–W
B–W
B–W
B–W
W–B
W–B
W–B
W–B
B–W
( *2)
L L
B–W
L
B–W
B–W
W–BL
B–W
L–R
L–R
DO
OR
CO
UR
TES
Y S
WR
EA
R L
H U
PP
ER
D19
DO
OR
CO
UR
TES
Y S
WR
EA
R L
H L
OW
ER
D18
DO
OR
CO
UR
TES
Y S
WF
RO
NT
LH
D16
DO
OR
CO
UR
TES
Y S
WR
EA
R R
H U
PP
ER
D21
DO
OR
CO
UR
TES
Y S
WR
EA
R R
H L
OW
ER
D20
DO
OR
CO
UR
TES
Y S
WF
RO
NT
RH
D17
A
IF
14 15
(*1)
( *1)
( *2)
( *2)
( *2)
( *2)
( *2)
( *2)
( *2)
( *2)
( *2)
(* 2)
( *1)
( *1)
( *2)
( *2)
( *2)
( *2)
C
JUN
CT
ION
CO
NN
EC
TO
R
J 5
E
E
L
E
JUN
CT
ION
CO
NN
EC
TO
R
J 4
A
B–W
B–W
B–W
5 BG2
4 BE2
C
(*2)
( *2)
( *2)
M1 2
BF21 BF24
BC
AAAA
IB43
L–R
( *4)
L–R
( *4)
L–R
1
JUNCTIONCONNECTOR
BJ21 , J22A
POWER WINDOW SW(BACK WINDOW)
P21
L–R
(*3)
POWER WINDOW MOTOR(BACK WINDOW)
P22
3 6 2
OPN CLS E1
G–B
R–L
G–B
R–L
JUN
CTI
ON
CO
NN
EC
TOR
J 3
W–B
( *2)
2003 TOYOTA TUNDRA (EWD491U)
205
IF43IB31
L–R
L–R
IC
IB42
IF42
8
R–B
R–B
IB41
IF41
10
R–W
R–W
5 2
1 2
3 1
LG L–Y
POWER WINDOWMOTOR FRONT RH
P12
R–B
R–W
4
L–R
W–B
W–B
1
UP DOWN
UP
DO
WN
WIN
DO
WLO
CK
SW
L–R
9 POWER WINDOW MASTER SWP10
2 1
3 4
POWER WINDOWMOTOR FRONT LH
P11
LG L–Y
PO
WE
R W
IND
OW
CO
NT
RO
L S
W R
H
P 9
* 1 : STANDARD CAB* 2 : ACCESS CAB
L–R
UP
DO
WN
UP
DO
WN
M
M
BA
AA
IE
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
* 3 : 5VZ–FE W/O DAYTIME RUNNING LIGHT M/T* 4 : EXCEPT *3
2003 TOYOTA TUNDRA (EWD491U)
206
POWER WINDOW
With the ignition SW turned on, current flows through the ECU IG fuse to TERMINAL 9 of the integration relay to TERMINAL2 to TERMINAL 1 of the power relay to TERMINAL 2 to GROUND, activating the power relay, and the current flowing fromTERMINAL 5 of the power relay flows to TERMINAL 3 to TERMINAL 9 of the power window master SW and TERMINAL 4 ofthe power window control SW RH.
1. MANUAL OPERATION (DRIVER’S WINDOW)With the ignition SW turned on and with the power window master SW (Manual SW) in UP position, the current flowing toTERMINAL 9 of the power window master SW flows to TERMINAL 3 to TERMINAL 2 of the power window motor LH toTERMINAL 1 to TERMINAL 4 of the master SW to TERMINAL 1 to GROUND and causes the power window motor to rotatein the up direction. The window ascends only while the SW is being pushed.In down operation, the current flowing from TERMINAL 9 of the power window master SW to TERMINAL 4 flows toTERMINAL 1 of the motor LH to TERMINAL 2 to TERMINAL 3 of the master SW to TERMINAL 1 to GROUND, flowing in theopposite direction to manual up operation, causing the motor to rotate in reverse and lowering the window.
2. AUTO DOWN OPERATION (DRIVER’S WINDOW)With the ignition SW on and with the auto SW of the power window master SW in DOWN position, the current flowing toTERMINAL 9 of the master SW flows to TERMINAL 4 of the master SW to TERMINAL 1 of the power window motor LH toTERMINAL 2 to TERMINAL 3 of the master SW to TERMINAL 1 to GROUND, causing the motor to rotate towards the downside.Then the solenoid in the master SW is activated and it locks the auto SW being pushed, causing the motor to continue torotate in auto down operation.When the window has completely descended, the current flowing between TERMINAL 3 of the master SW and TERMINAL 1increases. As a result, the solenoid stops operating, the auto SW turns off and the flowing from TERMINAL 9 of the masterSW to TERMINAL 4 is cut off, stopping the motor so that auto stop occurs.
3. STOPPING OF AUTO DOWN AT DRIVER’S WINDOWWhen the manual SW (Driver’s) is pushed to the up side during auto down operation, a ground circuit opens in the masterSW and current does not flow from TERMINAL 3 of the master SW to TERMINAL 1, so the motor stops, causing auto downoperation to stop. If the manual SW is pushed continuously, the motor rotates in the up direction in manual up operation.
4. MANUAL OPERATION BY POWER WINDOW CONTROL SW (PASSENGER’S WINDOW)With the power window control SW RH is pushed to the up side, the current flowing from TERMINAL 4 of the power windowcontrol SW RH flows to TERMINAL 3 of the power window control SW RH to TERMINAL 1 of the power window motor RH toTERMINAL 2 to TERMINAL 1 of the power window control SW RH to TERMINAL 2 to TERMINAL 10 of the master SW toTERMINAL 1 to GROUND. This causes the power window motor RH to rotate in the up direction. Up operation is continuousonly while the power window control SW RH is pushed to the up side. When the window descends, the current flowing to themotor flows in the opposite direction, from TERMINAL 1 to TERMINAL 2, and the motor rotates in revers.When the window lock SW is pushed to the lock side, the ground circuit to the passenger’s window becomes open. As aresult, even if Open/Close operation of the passenger’s window is tried, the current from TERMINAL 9 of the power windowmaster SW is not grounded and the motor does not rotate, so the passenger’s window can not be operated and window lockoccurs.
5. KEY OFF POWER WINDOW OPERATIONWith the ignition SW turned from on to off, the integration relay operates for about 43 seconds and current flows fromTERMINAL 1 of the power relay to TERMINAL 2 to GROUND. For this period, current also flows TERMINAL 5 to TERMINAL3. This current flows to TERMINAL 9 of the power window master SW and to TERMINAL 4 of the power window control SWRH. As a result, for about 43 seconds after the ignition SW is turned off, it is possible to raise and lower the power window bythe functioning of the integration relay. Also, by opening the door (Door courtesy SW on) within about 43 seconds afterturning the ignition SW to off, a signal is input to TERMINAL 3, 14 or 15 of the integration relay. As a result, the integrationrelay turns off, and up and down movement of the window stops.
SYSTEM OUTLINE
2003 TOYOTA TUNDRA (EWD491U)
207
D16, D17 DOOR COURTESY SW LH, RH1–GROUND : Continuity with door open
INTEGRATION RELAY9–GROUND : Approx. 12 volts with ignition SW at ON position3–GROUND : Always approx. 12 volts
14–GROUND : Continuity with front LH door open15–GROUND : Continuity with front RH door open (Standard cab)15–GROUND : Continuity with front RH, rear LH, RH door open (Access cab)
P9 POWER WINDOW CONTROL SW RH4–GROUND : Approx. 12 volts with ignition SW on and stays at 12 volts for 41.5 –44.5 seconds after the ignition SW is turned
off, but if a door is open in the 45 seconds period, voltage will drop to 0 volts
P10 POWER WINDOW MASTER SW1–GROUND : Always continuity9–GROUND : Approx. 12 volts with ignition SW on and stays at 12 volts for 41.5 –44.5 seconds after the ignition SW is turned
off, but if a door is opened in this 41.5 –44.5 seconds period, voltage will drop to 0 volts3–GROUND : Approx. 12 volts with ignition SW at ON position and master SW at UP position4–GROUND : Approx. 12 volts with ignition SW at ON position and master SW at DOWN or AUTO DOWN position
WINDOW LOCK SWOpen with window lock SW at LOCK position
: PARTS LOCATION
Code See Page Code See Page Code See Page
D1636 (Access Cab) J4 35 P10 37 (Standard Cab)
D1637 (Standard Cab) J5 35
P1136 (Access Cab)
D1736 (Access Cab) J21 A 35
P1137 (Standard Cab)
D1737 (Standard Cab) J22 B 35
P1236 (Access Cab)
D18 36 (Access Cab) J23 A 35P12
37 (Standard Cab)
D19 36 (Access Cab) J24 B 35 P21 35
D20 36 (Access Cab)P9
36 (Access Cab) P22 36 (Access Cab)
D21 36 (Access Cab)P9
37 (Standard Cab)
J3 35 P10 36 (Access Cab)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C22 (*2)
1C26 (*1)
1H22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1H26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB344 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF4 46 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
208
POWER WINDOW
: GROUND POINTS
Code See Page Ground Points Location
IE44 Left Kick Panel
IF44 Left Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B8 48 (Access Cab) Rear Door No.1 Wire LH B9 48 (Access Cab) Rear Door No.1 Wire RH
2003 TOYOTA TUNDRA (EWD491U)
209
MEMO
2003 TOYOTA TUNDRA (EWD491U)
210
KEY REMINDER AND SEAT BELT WARNING
10ADOME
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
10AGAUGE
1F5
1E6
1F3
A7
2
1
B2 C1
BI13
B12
BI14
C
IH
B8 B13
1
BG24
BE25
E
B
P–B
Y–B
W–B
BW
–B
BR
L ( *2)
L ( *2)
L ( *2)
E
UN
LOC
KW
AR
NIN
G S
W
U 1
DO
OR
CO
UR
TES
YS
W F
RO
NT
LH
D16
A9B5
L–Y
L–Y
B–Y
B2 (*4)A1 (*3)
A2 (*3)
B1 (*4)
C11
COMBINATION METER
BA , C12
* 2 : ACCESS CAB* 1 : STANDARD CAB
* 4 : BENCH SEAT* 3 : W/ POWER SEAT
P–B
2
SE
AT
BE
LT
E
E
JUN
CTI
ON
CO
NN
EC
TOR
J 7
C
C13, C
1
BR
E L
(*1)
L
JUN
CT
ION
CO
NN
EC
TO
R
J 8
JUN
CTI
ON
CO
NN
EC
TOR
J 4
BR
BB
7,
A
BU
CK
LE S
W L
H
B
B
JUN
CTI
ON
CO
NN
EC
TOR
J10
B
* 5 : SEPARATE SEAT, CAPTAIN SEAT (W/O POWER SEAT)
( *3,
*4)
( *3,
*4)
( *3,
*4)
C3
C4
B 7
C
BU
CK
LE S
W L
H
W–B
(*3, *4)
B ( *5)
( *5)
W–B
* 6 : W/ DOOR LOCK CONTROL* 7 : W/O DOOR LOCK CONTROL
L
(*1)
IE
BA
AA
JUNCTIONCONNECTOR
BJ23 , J24A
W–B
P–B ( *7)
( *6)
( *6)
2003 TOYOTA TUNDRA (EWD491U)
211
Current always flows to TERMINAL (B) 5 of the combination meter through the DOME fuse.
1. SEAT BELT WARNING SYSTEMWhen the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL (A) 9 of the combination meter. Thiscurrent activates the combination meter and the current flowing through the seat belt warning light flows from TERMINAL (B)8 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL (B) 12 of the combinationmeter to TERMINAL (B) 8 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL(B) 12 of the combination meter, the current flowing to TERMINAL (B) 5 of the combination meter flows from TERMINAL (B)8 to GROUND and the seat belt warning buzzer sounds. However, if the seat belt is put on during this period (While thebuzzer is sounding), signal input to TERMINAL (B) 12 of the combination meter stops and the current flow from TERMINAL(B) 5 of the combination meter to TERMINAL (B) 8 to GROUND is cut, causing the buzzer to stop.
2. KEY REMINDER SYSTEMWith the ignition key inserted in the key cylinder (Unlock warning SW on), the ignition SW still off and driver’s door open(Door courtesy SW on), when a signal is input to TERMINAL (B) 13 of the combination meter, the combination meteroperates, current flows from TERMINAL (B) 5 of the combination meter to TERMINAL (B) 8 to GROUND and key reminderbuzzer sounds.
B7 (A), (B) BUCKLE SW LH(A) 1–(A) 2, (B) 2–(B) 1 : Closed with driver’s seat belt in use
D16 DOOR COURTESY SW FRONT LH1–GROUND : Closed with front LH door open
U1 UNLOCK WARNING SW1–2 : Closed with ignition key in cylinder
C11 (A), C12 (B), C13 (C) COMBINATION METER(A) 7, (B) 8–GROUND : Always continuity(B)13–GROUND : Continuity with the front LH door open(C) 1–GROUND : Continuity with the ignition key in cylinder(B)12–GROUND : Continuity with the driver’s seat belt in use(B) 5–GROUND : Always approx. 12 volts(A) 9–GROUND : Approx. 12 volts withe ignition SW at ON or ST position
: PARTS LOCATION
Code See Page Code See Page Code See Page
A 38 (w/ Power Seat) C12 B 34 J8 35
B36 (Access Cab *3) C13 C 34 J10 35
B7B
37 (Standard Cab *3)D16
36 (Access Cab) J23 A 35
C36 (Access Cab *4)
D1637 (Standard Cab) J24 B 35
C37 (Standard Cab *4) J4 35 U1 35
C11 A 34 J7 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
212
KEY REMINDER AND SEAT BELT WARNING
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
48 (Access Cab)
BI1 50 (Standard Cab) Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
52
( )
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
IH 44 Right Kick Panel
2003 TOYOTA TUNDRA (EWD491U)
213
MEMO
2003 TOYOTA TUNDRA (EWD491U)
214
CIGARETTE LIGHTER AND POWER OUTLET
15AACC
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G6 1G12
IA416
2
3 1
5 2
2
15APWROUTLET2
2
15APWROUTLET1
2
IA42 IA510
1
2
1
2
I 2
2 2
2
ID21ID11
1
2
ID12ID22
A
IF
J 3JUNCTIONCONNECTOR
EA
W–B
W–B
(* 1)(*2)
(*1)(*2)
W–B
GR
W–B
B
2
GR
GR
GR
1
140A
ALT
(*3
)10
0A A
LT (
*4)
PO
WE
R O
UTL
ET
RE
LAY
B
G
G–B
G
G–B
W–B
W–B
W–B
BA
TTE
RY
* 2 : W/O CIGARETTE LIGHTER ILLUMINATION* 1 : W/ CIGARETTE LIGHTER ILLUMINATION
CIGARETTELIGHTER
C 7POWEROUTLET
P 6POWEROUTLET
P 7
2
1
2
1
I 2
W–B
W–B
* 3 : TOWING PACKAGE* 4 : EXCEPT TOWING PACKAGE
B ( *4)
B–L
( *3)
B–L
(*3)B
(*4)
A
A
JUN
CTI
ON
CO
NN
EC
TOR
J18
2003 TOYOTA TUNDRA (EWD491U)
215
C7 CIGARETTE LIGHTER2–GROUND : Approx. 12 volts with ignition SW at ON or ACC position1–GROUND : Always continuity
P6, P7 POWER OUTLET2–GROUND : Approx. 12 volts with the ignition SW at ON or ACC position1–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C7 34J18
31 (2UZ–FE) P6 35
J3 35J18
33 (5VZ–FE) P7 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
ID146 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
ID246 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I2 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
216
CLOCK
15ATAIL
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G4
15AACC
1G10
10ADOME
2
4
6
1E6
1F4
E
E
B5 B13
A7
A
II
J13JUNCTIONCONNECTOR
GG
L–Y
GR
L–Y
INTEGRATIONRELAY
JUNCTIONCONNECTOR
J10
L–Y
G
2
1
B1
W–B
W–B
INTEGRATION CONTROLAND PANEL
B ACC
ILL+ GND
GR
BI24 A , I25
AB
BC
JUNCTIONCONNECTOR
BJ23 , J24A
2003 TOYOTA TUNDRA (EWD491U)
217
I24 (A), I25 (B) INTEGRATION CONTROL AND PANEL(B) 5–GROUND : Always approx. 12 volts (Power for clock)(B)13–GROUND : Approx. 12 volts with ignition SW at ON or ACC position (Power for indication)(A) 7–GROUND : Approx. 12 volts with light control SW at TAIL or HEAD position (Signal of indication)(B) 1–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
I24 A 35 J10 35 J23 A 35
I25 B 35 J13 35 J24 B 35
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G26 (*1)
: GROUND POINTS
Code See Page Ground Points Location
II 44 Right Kick Panel
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
218
HORN
10AHORN
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1E8
6
1 1
B
G–R
1
B
HORN SW[COMB. SW]
C16
HORN RHH 8
HORN LHH 7
7
(*3)
A
A
JUNCTIONCONNECTOR
J10
G–R
(*1)
* 1 : 5VZ–FE W/ DOOR LOCK CONTROL, 2UZ–FE* 2 : 5VZ–FE W/O DOOR LOCK CONTROL W/ DAYTIME RUNNING LIGHT* 3 : 5VZ–FE W/O DOOR LOCK CONTROL W/O DAYTIME RUNNING LIGHT* 4 : 5VZ–FE W/ DOOR LOCK CONTROL W/ DAYTIME RUNNING LIGHT,
2UZ–FE W/ DAYTIME RUNNING LIGHT* 5 : 5VZ–FE W/ DOOR LOCK CONTROL W/O DAYTIME RUNNING LIGHT,
2UZ–FE W/O DAYTIME RUNNING LIGHT
INTEGRATIONRELAY
1L1N
1212 (*2, *4)
(*5)
G–R
2003 TOYOTA TUNDRA (EWD491U)
219
C16 HORN SW [COMB. SW]6–GROUND : Continuity with horn SW on
: PARTS LOCATION
Code See Page Code See Page Code See Page
C16 34 H7 32 (5VZ–FE) H8 32 (5VZ–FE)
H7 30 (2UZ–FE) H8 30 (2UZ–FE) J10 35
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1L 23 (*2)Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
220
WIPER AND WASHER (w/ INT TIME SW MECHANISM)
POWER SOURCE SYSTEM (SEE PAGE 56)
1F51G21E31G3
9
1
EA
IA423
II
L
L L
LG–R
LG–R
W–B
L–R
L–R
W–B
W–B
L Y–L
L–B
L–W
W–B
L–R
W–B
L–WL
L–B
Y–L
L–R
L
17 8 7 16 2 11
3 5 2 1 4
OFF
INT
LOW
WASHER
HIGH
M
+2 +1 B S E
WIPER AND WASHER SW[COMB. SW]C17
WIP
ER
RE
LAY
WA
SH
ER
LE
VE
LW
AR
NIN
G L
IGH
T[C
OM
B.
ME
TER
]
C11
WIPER MOTORW 4
JUNCTIONCONNECTOR
J13A
IF
JUNCTIONCONNECTOR
J 3A
20AWIP
10AGAUGE
M
B–Y
IA410
2
1
WA
SH
ER
LE
VE
L S
EN
SO
R[W
AS
HE
R M
OT
OR
]
W 2
4
3
WA
SH
ER
MO
TOR
W 2
2003 TOYOTA TUNDRA (EWD491U)
221
With the ignition SW turned on, current flows to TERMINAL 17 of the wiper and washer SW, TERMINAL 3 of the washermotor and TERMINAL 2 of the wiper motor through the WIP fuse.
1. LOW SPEED POSITIONWith wiper SW turned to LOW position, current flows from TERMINAL 17 of the wiper and washer SW to TERMINAL 7 toTERMINAL 5 of the wiper motor to TERMINAL 4 to GROUND and causes the wiper motor to run at low speed.
2. HIGH SPEED POSITIONWith wiper SW turned to HIGH position, current flows from TERMINAL 17 of the wiper and washer SW to TERMINAL 8 toTERMINAL 3 of the wiper motor to TERMINAL 4 to GROUND and causes the motor to run at high speed.
3. INT POSITIONWith wiper SW turned to INT position, the relay operates and the current which is connected by relay function flows fromTERMINAL 17 of the wiper and washer SW to TERMINAL 2 to GROUND. This flowing the intermittent circuit and currentflows from TERMINAL 17 of the wiper and washer SW to TERMINAL 7 to TERMINAL 5 of the wiper motor to TERMINAL 4 toGROUND and the wiper functions.The intermittent operation is controlled by charging and discharging of the condenser installed in the relay and theintermittent time is controlled by a time control SW to change the charging time of the condenser.
4. WASHER INTERLOCKING OPERATIONWith the washer SW turned to on, current flows from TERMINAL 3 of the washer motor to TERMINAL 4 to TERMINAL 11 ofthe wiper and washer SW to TERMINAL 2 to GROUND and causes to the washer motor to run, and the window washer isjetted.This causes current to flow to washer continuous operation circuit in TERMINAL 17 of the wiper and washer SW toTERMINAL 7 to TERMINAL 5 of the wiper motor to TERMINAL 4 to GROUND and the wiper functions.
C17 WIPER AND WASHER SW [COMB. SW]2–GROUND : Always continuity
17–GROUND : Approx. 12 volts with ignition SW at ON position7–GROUND : Approx. 12 volts with wiper and washer SW at LOW position
Approx. 12 volts every approx. 1.6 to 10.7 seconds intermittently with wiper SW at INT position16–GROUND : Approx. 12 volts with ignition SW on unless wiper motor at STOP position
8–GROUND : Approx. 12 volts with ignition SW on and wiper and washer SW at HIGH position11–2 : Continuity with washer SW on
W4 WIPER MOTOR1–2 : Closed unless wiper motor at STOP position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 34 J13 35W4
31 (2UZ–FE)
C17 34W2
31 (2UZ–FE)W4
33 (5VZ–FE)
J3 35W2
33 (5VZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
222
WIPER AND WASHER (w/ INT TIME SW MECHANISM)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
II 44 Right Kick Panel
2003 TOYOTA TUNDRA (EWD491U)
223
MEMO
2003 TOYOTA TUNDRA (EWD491U)
224
WIPER AND WASHER (w/o INT TIME SW MECHANISM)
POWER SOURCE SYSTEM (SEE PAGE 56)
1F51G21E31G3
9
1
EA
IA423
II
L
L L
B–Y
LG–R
LG–R
W–B
L–R
L–R
W–B
W–B
L
Y–L
L–B
L–W
W–B
L–R
W–B
L–WL
L–B
Y–L
L–R
L
W–B
17 8 7 16 2 11
3 5 2 1 4
M
+2 +1 B S E
WIPER AND WASHER SW[COMB. SW]C17
WA
SH
ER
LE
VE
LW
AR
NIN
G L
IGH
T[C
OM
B.
ME
TER
]
C11
WIPER MOTORW 4
JUNCTIONCONNECTOR
J13A
IF
JUNCTIONCONNECTOR
J 3A
20AWIP
10AGAUGE
MIST
OFF
LO
HIGH
WASHER
M
4
3
IA410
2
1
WA
SH
ER
LE
VE
L S
EN
SO
R[W
AS
HE
R M
OT
OR
]
W 2
WA
SH
ER
MO
TOR
W 2
2003 TOYOTA TUNDRA (EWD491U)
225
With the ignition SW turned on, current flows to TERMINAL 17 of the wiper and washer SW, TERMINAL 3 of the washermotor and TERMINAL 2 of the wiper motor through the WIP fuse.
1. LOW SPEED POSITIONWith wiper SW turned to LOW position, current flows from TERMINAL 17 of the wiper and washer SW to TERMINAL 7 toTERMINAL 5 of the wiper motor to TERMINAL 4 to GROUND and causes the wiper motor to run at low speed.
2. HIGH SPEED POSITIONWith wiper SW turned to HIGH position, current flows from TERMINAL 17 of the wiper and washer SW to TERMINAL 8 toTERMINAL 3 of the wiper motor to TERMINAL 4 to GROUND and causes the motor to run at high speed.
3. MIST POSITIONWith the wiper SW turned to MIST position, current flows from TERMINAL 17 of the wiper and washer SW to TERMINAL 7 toTERMINAL 5 of the wiper motor to TERMINAL 4 to GROUND and causes the wiper motor to run at low speed.
4. WASHER INTERLOCKING OPERATIONWith the washer SW turned to on, current flows from TERMINAL 3 of the washer motor to TERMINAL 4 to TERMINAL 11 ofthe wiper and washer SW to TERMINAL 2 to GROUND and causes to the washer motor to run, and the window washer isjetted.
C17 WIPER AND WASHER SW [COMB. SW]2–GROUND : Always continuity
17–GROUND : Approx. 12 volts with ignition SW at ON position7–GROUND : Approx. 12 volts with wiper and washer SW at LOW or MIST position
16–GROUND : Approx. 12 volts with ignition SW on unless wiper motor at STOP position8–GROUND : Approx. 12 volts with ignition SW on and wiper and washer SW at HIGH position
11–GROUND : Continuity with washer SW on
W4 WIPER MOTOR1–2 : Closed unless wiper motor at STOP position
: PARTS LOCATION
Code See Page Code See Page Code See Page
C11 34 J13 35W4
31 (2UZ–FE)
C17 34W2
31 (2UZ–FE)W4
33 (5VZ–FE)
J3 35W2
33 (5VZ–FE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1G26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA4 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
II 44 Right Kick Panel
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SYSTEM OUTLINE
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
226
MIRROR HEATER
15AMIR HTR
2
1
2
10AGAUGE
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1F9
IE
BA BA
AA
E
2
E
4
E
1 5
2 3
22
2 2
IA516
IA425 IB36 IF36
6
2
6
2
IB31 IF31
II
A
IA411
6
D
D D
JUNCTIONCONNECTOR
BJ23 , J24A
B–Y
P–G
B–Y
R–W
B–Y
R–W
R–W
R–W
B–Y
R–W
R–W
R–W
W–B
W–B
R–WW
P–G
W–B
W–B
W–B
W–B
W–B
MIRROR HEATER SWM 4
JUNCTIONCONNECTOR
J13
JUNCTIONCONNECTOR
J11
MIR
RO
R H
EA
TER
LH
[RE
MO
TE C
ON
TRO
L M
IRR
OR
LH
]
R 8
MIR
RO
R H
EA
TER
RH
[RE
MO
TE C
ON
TRO
L M
IRR
OR
RH
]
R 9
JUN
CTI
ON
CO
NN
EC
TOR
J 8
E D
IGMIR HTRRELAY
2003 TOYOTA TUNDRA (EWD491U)
227
MIR HTR RELAY5–3 : Closed with the ignition SW on and the mirror heater SW on
M2 MIRROR HEATER SW2–GROUND : Approx. 12 volts with the ignition SW on4–GROUND : Always continuity
R8, R9 MIRROR HEATER LH, RH [REMOTE CONTROL MIRROR LH, RH]2–GROUND : Approx. 12 volts with the ignition SW on and the mirror heater SW on6–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
J8 35 J24 B 35R9
36 (Access Cab)
J11 35 M4 35R9
37 (Standard Cab)
J13 35R8
36 (Access Cab)
J23 A 35R8
37 (Standard Cab)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IB3 44 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF3 46 Front Door RH Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
II 44 Right Kick Panel
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
228
REMOTE CONTROL MIRROR
15AACC
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
1G11
A
A
IB37
GR
GR
(A/T)
(A/T)
GR
( M/T
)
M M M M
IB311 IB310 IB312 IB31
IF311 IF310 IF312
B 2
IE
LG–R
L–B
Y–B
LG–R
L–B
Y–B
W–B
Y–BR
P–G
5 2 4 3 6 7
R L–B
P–G
LG–R
Y–B
W–B
L–B
P–G
Y–B
Y–B
OP
ER
ATI
ON
SW
SE
LEC
T S
W
DO
WN
/R
IGH
T
UP
/LE
FT
LH RH LH RH
LEF
T
RIG
HT
UP
DO
WN
GR
REMOTE CONTROLMIRROR SW
R10
8
JUNCTIONCONNECTOR
J 9
* 1 : W/ MIRROR HEATER* 2 : W/O MIRROR HEATER
BA
AA
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
R 8 ,
REMOTE CONTROL MIRROR LH
A B R 9 ,
REMOTE CONTROL MIRROR RH
A B
B1 (*2)A5 (*1)
B1 (*2)A5 (*1)
B3A1
B2A3
B3A1
B2A3
2003 TOYOTA TUNDRA (EWD491U)
229
R10 REMOTE CONTROL MIRROR SW8–GROUND : Approx. 12 volts with ignition SW at ACC or ON position
6–7 : Continuity with operation SW at UP or LEFT position8–6 : Continuity with operation SW at DOWN or RIGHT position
: PARTS LOCATION
Code See Page Code See Page Code See Page
J9 35R8
A 37 (Standard Cab) R9 B 37 (Standard Cab)
J23 A 35R8
B 37 (Standard Cab)R10
36 (Access Cab)
J24 B 35A
36 (Access Cab)R10
37 (Standard Cab)
R8A 36 (Access Cab) R9
A37 (Standard Cab)
R8B 36 (Access Cab) B 36 (Access Cab)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB3 44 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF3 46 Front Door RH Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B2 48 (Access Cab) Front Door LH Wire B2 50 (Standard Cab) Front Door LH Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
230
POWER SEAT
POWER SEAT CONTROL SW(DRIVER’ S SEAT)
9 6
P16
SLIDEREARVERTICAL RECLINING
10 5 7 8 3 2
FRO
NT
RE
AR
UP
DO
WN
UP
DO
WN
FRO
NT
RE
AR
4
30APOWER
POWER SOURCE SYSTEM (SEE PAGE 56)
1C4
W–G
L–W
1
IE
BI11
W–B1 2
B
B–R
1 2
W–R
W–G
2 1
Y–G
Y–R
2 1
L–R L
POWER SEAT MOTOR(DRIVER’ S SEAT SLIDE CONTROL)
P19POWER SEAT MOTOR(DRIVER’ S SEAT FRONT VERTICAL CONTROL)
P15POWER SEAT MOTOR(DRIVER’ S SEAT REAR VERTICAL CONTROL)
P17POWER SEAT MOTOR(DRIVER’ S SEAT RECLINING CONTROL)
P18
W–B
1
2
FRONTVERTICAL
MMMM
L–W
W–B
L–W
W–B
A
AA
JUN
CT
ION
CO
NN
EC
TO
RJ1
7
1 23
A
A A
JUNCTIONCONNECTOR
J16
4
3
1
BI12
SHORTPIN
S 8
R L
BJ11 BJ12
R L
M
2
1
PO
WE
R S
EA
T M
OTO
R( D
RIV
ER
’S
SE
AT
LU
MB
AR
SU
PP
OR
T C
ON
TR
OL)
P20
LUMBAR SUPPORTCONTROL SW(DRIVER’ S SEAT)
L 3
I 1W–B
AA
BA
JUNCTIONCONNECTOR
BJ23 , J24A
W–B
W–B
W–G
2
W–G W–BAC
AC
JUNCTIONCONNECTOR
J23 A
2003 TOYOTA TUNDRA (EWD491U)
231
P16 POWER SEAT CONTROL SW (DRIVER’S SEAT)1–9 : Closed with driver’s seat at front slide operation1–6 : Closed with driver’s seat at rear slide operation1–3 : Closed with driver’s seat at front reclining operation1–2 : Closed with driver’s seat at rear reclining operation
1–10 : Closed with driver’s seat at front vertical up operation1–5 : Closed with driver’s seat at front vertical down operation1–7 : Closed with driver’s seat at rear vertical up operation1–8 : Closed with driver’s seat at rear vertical down operation
4–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
J16 38 L3 38 P18 38
J17 38 P15 38 P19 38
J23 A 35 P16 38 P20 38
J24 B 35 P17 38 S8 35
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1C22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1C26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
48 (Access Cab)
BI1 50 (Standard Cab) Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
52
( )
BJ1 52 Seat No.1 Wire and Seat No.2 Wire (Under the Driver’s Seat)
: GROUND POINTS
Code See Page Ground Points Location
IE 44 Left Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
232
RADIO AND PLAYER
20ARADIO
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
15AACC
1G10
R
IA511
B4
B
B3
ACC
B7
E
B1
FR+
2 IF110 IF4
BC11
B 5
LGLG
LG
2 1
1 2
LG
LG
B5
FR–
3 IF15 IF4
BC12
B 5
LL
L
L
L
2 BA1
IB45IB23
FL–
6 B
LG
LG
21
12
LGLG
P
B 1
1 BA1
IB410IB22
FL+
2 B
F 9FRONT DOOR SPEAKERRH
T 8TWEETER RH
B 1
VV
L
L
L
F 8FRONT DOOR SPEAKERLH
T 7TWEETER LH
P L ( *2)
( *1)
( *2)
( *1)
(* 1)(*2)
A2
RL+
BG22
BB
B
1 2
A6
RL+
3 BF22 BF2
BG21
YY
Y
R 6REAR DOOR SPEAKERLH
A1
RR+
3 BE2
BH12
RR
R
1 2
A3
RR–
2 BE2
BH11
WW
W
R 7REAR DOOR SPEAKERRH
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
( *3)
IG
BR
1413
ACC1ACC
INTEGRATION CONTROLAND PANEL
I25
GR
GR
GR
R
GR
RADIO AND PLAYER
BR 1 , R 2A
2
1
* 2 : W/O DOOR LOCK CONTROL* 1 : W/ DOOR LOCK CONTROL
* 3 : ACCESS CAB
C, R11
II15 3 II1 4 II1
SWG
6 C 7
SW1
C C8
SW2
10
EAU
12
AU1
11
AU2
G–BLR
R L
G–B
STEERING PAD SW[COMB. SW]
C16
2003 TOYOTA TUNDRA (EWD491U)
233
R2 (B) RADIO AND PLAYER(B) 3–GROUND : Approx. 12 volts with ignition SW at ON or ACC position(B) 4–GROUND : Always approx. 12 volts(B) 7–GROUND : Always continuity
S7 (D) STEREO COMPONENT AMPLIFIER(D) 3–GROUND : Approx. 12 volts with ignition SW at ON or ACC position(D) 4–GROUND : Always approx. 12 volts(D) 7–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
C16 34 I25 35 R11 C 35
F836 (Access Cab) R1 A 35
T736 (Access Cab)
F837 (Standard Cab) R2 B 35
T737 (Standard Cab)
F936 (Access Cab) R6 36 (Access Cab)
T836 (Access Cab)
F937 (Standard Cab) R7 36 (Access Cab)
T837 (Standard Cab)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1G22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1G26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IB244 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IB444 Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF146 Front Door RH Wire and Cowl Wire (Right Kick Panel)
IF446 Front Door RH Wire and Cowl Wire (Right Kick Panel)
II1 46 Cowl Wire and Cowl Wire (Instrument Panel Reinforcement RH)
BA148 (Access Cab)
Front Door LH Wire and Speaker Tweeter Wire LH (Inside of Front Door LH)BA150 (Standard Cab)
Front Door LH Wire and Speaker Tweeter Wire LH (Inside of Front Door LH)
BC148 (Access Cab)
Front Door RH Wire and Speaker Tweeter Wire RH (Inside of Front Door RH)BC150 (Standard Cab)
Front Door RH Wire and Speaker Tweeter Wire RH (Inside of Front Door RH)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
: GROUND POINTS
Code See Page Ground Points Location
IG 44 Instrument Panel Brace RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
B148 (Access Cab)
Speaker Tweeter Wire LH B548 (Access Cab)
Speaker Tweeter Wire RHB150 (Standard Cab)
Speaker Tweeter Wire LH B550 (Standard Cab)
Speaker Tweeter Wire RH
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
234
COMBINATION METER
IE225IE34
1F8 1F5
C
(*1)17
C
6 (*2)B
B
A
B B C C B B
BCA
72
IE1IE1
IE15
4WD CONTROLECU
F 7
GAUGE
SE
AT
BE
LT
DO
OR
VEHICLE SPEEDSENSOR(COMBINATION METER)
V 2
9
DD
5
D
3
3
D
2 13 12 13 9 1 4 6 7
B–Y
G–O
G–O
G–O
B–Y
B–Y
B–Y
G–B
P–L
B
G–B
P–L
L–W
B–Y
B–Y
W–LR
JUNCTIONCONNECTOR
J 9
8
3 2
1
( *2)
( *2)
( *1)
G–O ( *1)
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
SPD(*1)SP1(*2)
TACH
10A
TO
BU
CK
LE S
W
TO D
OO
R C
OU
RT
ES
YS
W L
H
FRO
M IG
NIT
ION
KE
YC
YLI
ND
ER
LIG
HT
TO
IG
NIT
ION
KE
YC
YLI
ND
ER
LIG
HT
TO D
OO
R C
OU
RTE
SY
SW
2
DOME10A
L–Y
L–Y
1E6
1F3
2
1
L–B
SPD
TO U
NLO
CK
WA
RN
ING
SW
, C14C13, CC11
COMBINATION METER
BA , C12 D
IE19IE36
(*3)(*4)
IE23IE217
R–L
R–L
P–L
P–L
( *1)
( *2)
( *2)
( *1)
( *1)
( *2)
( *2)
( *1)
IGN
ITE
RI 2 E
3
EN
GIN
E C
ON
TR
OL
MO
DU
LEA
A5
1L11
(*1)(*2)
P–BLB
B
C
SR
S
TO C
EN
TER
AIR
BA
GS
EN
SO
R A
SS
EM
BLY
10
B–Y
INTEGRATIONRELAY
(*8)
G–O ( *5)
ENGINE CONTROLMODULE
BE 3 , E 4A
1N11
TACHOMETERSPEEDOMETERLCD
2003 TOYOTA TUNDRA (EWD491U)
235
IE113IE110
A
OIL
* 5 : W/ DAYTIME RUNNING LIGHT
1
BB15BB14 IE1248
C C D A A A D B BB
IH
OIL PRESSURESW
WA
TER
TE
MP
.
O 2FUELSENDER
F10
FU
EL
FU
EL
O/D
OF
F
JUNCTIONCONNECTOR
J 8
WA
SH
ER
4LO
4HI
( *1)
4WD
(*2
)
8 6 5 3 12 1 8 1 11 10
CC
2 1
3
C
6
Y–R
Y–R
BR
Y–R
B–R
L–O
Y–B
LG–R
BR
BR
–Y
Y–B
Y–B
BR
B1 (*2)A1 (*1)
(*2)(*1)
* 4 : 5VZ–FE M/T* 3 : 5VZ–FE A/T* 2 : 5VZ–FE* 1 : 2UZ–FE
( *1)
( *1)
BB16
TO E
NG
INE
CO
NTR
OL
MO
DU
LE
TO W
AS
HE
R L
EV
EL
SE
NS
OR
FR
OM
INT
EG
RA
TIO
N C
ON
TRO
LA
ND
PA
NE
L
TO 4
WD
CO
NT
RO
L E
CU
FR
OM
INT
EG
RA
TIO
N C
ON
TRO
LA
ND
PA
NE
L
TO 4
WD
CO
NT
RO
L E
CU
(*1
)
( *1)
TO
AD
D D
ET
EC
TIO
N S
W (
*2)
GR
BR
–Y
( *1)
( *1)
( *1)
( *1)
( *1)
( *1)
( *2)
C11
COMBINATION METER
BA , C12 C, C13 C14, D
BW
3,
A
WA
TER
TE
MP
. S
EN
DE
R
IE1 (*2)(*1)
B–R
Y–R
BR
BR
BR
Y–B
OIL
( *7)
( *6)
( *6)
( *7)
* 6 : W/ TACHOMETER* 7 : W/O TACHOMETER* 8 : W/O DAYTIME RUNNING LIGHT
1
OIL
PR
ES
SU
RE
SE
ND
ER
O 6
HE
AT
WIR
E
Y–B ( *6)
( *7)
2003 TOYOTA TUNDRA (EWD491U)
236
COMBINATION METER
VO
LT
C9
2 B
CR
UIS
E
BR
AK
E
HIG
H B
EA
M
AB
S11
B16
A 7 C A13
2
1
1B5
1E4
1B
6
2
1 1
EA
I 2IA5
18
A
IF
J 3JUNCTIONCONNECTOR
A
PARKINGBRAKESW (M/T)
P 5PARKINGBRAKESW (A/T)
P 5
R–G
W–B
(*5)
(*5 M/T)
(*5 A/T)( *8
A/T
)
(* 8 M/T)
BR
AK
E F
LUID
LE
VE
LW
AR
NIN
G S
W
B 2
TO A
BS
AC
TU
ATO
R W
ITH
EC
U
FRO
M IN
TE
GR
ATI
ON
RE
LAY
(*5
)FR
OM
HE
AD
LIG
HT
LH,
RH
(*8
)
FRO
M U
NLO
CK
WA
RN
ING
SW
( *1)
( *2)
A
II
J13JUNCTIONCONNECTOR
C11
COMBINATION METER
BA , C12 C, C13 D, C14
D10
A/T
OIL
TE
MP
.
MA
LFU
NC
TIO
NIN
DIC
AT
OR
LA
MP
8 C
TO
EN
GIN
E C
ON
TR
OL
MO
DU
LE
Y–B
Y
B–R
V–G
Y–R
G–W
G–W
W–B W
–B
W–B
W–B
B–L
W–B
R–W
G–W
R–W
R–W
R–W
W–B
W–B ( M
/T)
TO
EN
GIN
E C
ON
TR
OL
MO
DU
LE
W–B
A
AA
JUN
CT
ION
CO
NN
EC
TO
R
J18
INT
EG
RA
TIO
NR
ELA
Y
1N13
1N1
2003 TOYOTA TUNDRA (EWD491U)
237
C12 1 B 3 B
TUR
N L
H
CH
AR
GE
TUR
N R
H
B4A7
10 1F
5AIGN
A/T
P
D8 D6
2 ND
D7
R P
D5 D4 B15
ILLU
MIN
AT
ION
B14D2
G–Y
G–B
B–O
Y–G
L
LG–B
W–R
R–B
L–Y
GW
–G
R–Y
* 8 : W/O DAYTIME RUNNING LIGHT* 5 : W/ DAYTIME RUNNING LIGHT
D9
LLG
TO
GE
NE
RA
TOR
TO
DE
TEC
TIO
N S
W( T
RA
NS
FER
NE
UTR
AL
PO
SIT
ION
)
TO R
HE
OS
TA
T
FRO
M T
UR
N S
IGN
AL
FLA
SH
ER
FRO
M IN
TE
GR
ATI
ON
RE
LAYFROM A/T INDICATOR SW
[PARK/NEUTRAL POSITION SW]
(*2)
( *2)
( *2)
( *2)
* 1 : 2UZ–FE* 2 : 5VZ–FE
C11
COMBINATION METER
BA , C12 C, C13 D, C14
W–B
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
I 1
IE
BA
AA
JUNCTIONCONNECTOR
BJ23 , J24A
W–B
W–B
W–B
2003 TOYOTA TUNDRA (EWD491U)
238
COMBINATION METER
B2 BRAKE FLUID LEVEL WARNING SW1–2 : Closed with float down
P5 PARKING BRAKE SW1–GROUND : Closed with parking brake lever pulled up
C11 (A), C12 (B), C13 (C) COMBINATION METER(B) 5–GROUND : Always approx. 12 volts
(A) 9, (B) 3–GROUND : Approx. 12 volts with ignition SW at ON or ST position(A) 7, (A)13, (B) 8–GROUND :Always continuity
W3 (A), (B) WATER TEMP. SENDER(A) 1, (B) 1-GROUND : Approx. 160–240 Ω (50°C, 122°F)
: Approx. 17.1–21.2 Ω (120°C, 248°F)
: PARTS LOCATION
Code See Page Code See Page Code See Page
B230 (2UZ–FE)
F1036 (Access Cab) J23 A 35
B232 (5VZ–FE)
F1037 (Standard Cab) J24 B 35
C11 A 34 I2 33 (5VZ–FE)O2
31 (2UZ–FE)
C12 B 34 J3 35O2
33 (5VZ–FE)
C13 C 34 J8 35 P5 35
C14 D 34 J9 35V2
31 (2UZ–FE)
E3 A 34 J13 35V2
33 (5VZ–FE)
E4 B 34J18
31 (2UZ–FE)W3
A 31 (2UZ–FE)
F7 35J18
33 (5VZ–FE)W3
B 33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1B22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1B26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1L 23 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA5 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
BB148 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
239
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IE44 Left Kick Panel
IF44 Left Kick Panel
IH44 Right Kick Panel
II44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I1 46 Cowl Wire I2 46 Cowl Wire
2003 TOYOTA TUNDRA (EWD491U)
240
AIR CONDITIONING
E
7
6
B9A13A15 B4
2
1
A18 A21 A19
A3 A9 (*2)B33 B2B31 (*1)
IE14IE216IE38
A8
G–W ( *1)
B–W ( *1)
L–R
( *1)
L–R
( *1)
A10 A20
L–B
L–YL
( *1)
W–G
B–L
W–L
( *2)
I24
INTEGRATION CONTROL AND PANEL
BA , I25
E 3
ENGINE CONTROLMODULE
BA , E 4
B–Y
B–Y
B–W B
B–Y
B–L
JUNCTIONCONNECTOR
J 8
E
AIR INLETCONTROLSERVO MOTOR
A15
(*3)(*4)
DE
FR
OS
TER
SW
[BLO
WE
R S
W]
B 6
M
FRS REC
+
5
2 1
E
W–L
( *2)
A/C
TH
ER
MIS
TOR
A13
A/C
MA
GN
ET
ICC
LUT
CH
FRS REC IG L
AIND(*1)ACT(*2) A/CS
A/CM(*1)AC1(*2) MGC E IN
B–Y
B–Y
B–Y
B–YB–YB–Y
A/C
LO
CK
SE
NS
OR
B1 (*2)A3 (*1)A1A2
A 2
A/C MAGNETIC CLUTCH
B
A 3
A/C MAGNETIC CLUTCHAND LOCK SENSOR
A
B–Y
E
E 5 EC , E 7
, E28C23
G–W ( *1)
B–W ( *1)
LCK1 E2
( *2)
( *2)
ACID(*1)ACT(*2)
A/CS ACMG(*1)AC1(*2)
2003 TOYOTA TUNDRA (EWD491U)
241
10AA/C
2
2
1
2
B12
IA52
B1
A
II
W–B
L–R
W–L
50AHTR
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
10AGAUGE
1E51F9
C
C
1 3
2 5
4
2 2
2 2 2
EA
IA419
A
IF
E 1
2 3
4 1
IA413
2
1
I16
8 4
LOM1M2H15
3
1
B–Y
L–R
B–Y
L–R
W–BL–B
W–B
W–B
W–B
B–Y
R
RB–Y
L–R
L–R
L–B
BLOWERMOTOR
B 4
BLOWER RESISTORB 5
L–Y
L–R
JUNCTIONCONNECTOR
J 1
HTRRELAY
Y–R
Y–R
BLOWER SWB 6
* 1 : 2UZ–FE* 2 : 5VZ–FE* 3 : 5VZ–FE A/T* 4 : 5VZ–FE M/T
1
2
B
GND
JUN
CTI
ON
CO
NN
EC
TOR
J13
A W–B
W–B
L–B
Y–R
W–B
W–L
I 4
JUNCTIONCONNECTOR
J 3A
W–B
W–B
I24
INTEGRATION CONTROL AND PANEL
BA , I25
2
1
IA417IA48
A6 B11
A/C
DU
AL
PR
ES
SU
RE
SW
A 1
IG+ AC+2
M
A
A
JUN
CTI
ON
CO
NN
EC
TOR
J18
O ( *2)
O ( *2)
L–W
( *2)
W–L
( *2)
2003 TOYOTA TUNDRA (EWD491U)
242
AIR CONDITIONING
1. HEATER BLOWER MOTOR OPERATIONCurrent is applied at all times through the HTR fuse to TERMINAL 5 of the HTR relay.When the ignition SW is turned on, current flows through the GAUGE fuse to TERMINAL 2 of the HTR relay to the coil sideto TERMINAL 1 to TERMINAL 3 of the blower SW.
∗ Low speed operationWhen the blower SW is moved to LO position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 toGROUND, causing the HTR relay to switch on. This causes the current to flow from the HTR fuse to TERMINAL 5 of theHTR relay to TERMINAL 3 to TERMINAL 1 of the blower motor to TERMINAL 2 to TERMINAL 4 of the blower resistor toTERMINAL 1 to GROUND, causing the blower motor to rotate at low speed.
∗ Medium speed operation (Operation at M1, M2)When the blower SW is moved to M1 position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 toGROUND, turning the HTR relay to switch on. This causes the current to flow from the HTR fuse to TERMINAL 5 of theHTR relay to TERMINAL 3 to TERMINAL 1 of the blower motor to TERMINAL 2 to TERMINAL 4 of the blower resistor toTERMINAL 3 to TERMINAL 4 of the blower SW to TERMINAL 1 to GROUND. At this time, the blower resistance of theblower resistor is less than at low speed, so the blower motor rotates at medium low speed.When the blower SW is moved to M2 position, current flows through the motor flows from TERMINAL 4 of the blowerresistor to TERMINAL 2 to TERMINAL 8 of the blower SW to TERMINAL 1 to GROUND. At this time, resistance of theblower resistor is less than at M1 position, so the blower motor rotates at medium high speed.
∗ High speed operationWhen the blower SW is moved to HIGH position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 toGROUND, turning the HTR relay to switch on.This causes the current to flow from the HTR fuse to TERMINAL 5 of the HTR relay to TERMINAL 3 to TERMINAL 1 of theblower motor to TERMINAL 2 to TERMINAL 5 of the blower SW to TERMINAL 1 to GROUND, causing the blower motor torotate at high speed.
2. OPERATION OF AIR INLET CONTROL SERVO MOTOR∗ Switching from FRESH to RECIRC
With the ignition SW turned on, current flows from the GAUGE fuse to TERMINAL 5 of the air inlet control servo motor.When the RECIRC/FRESH SW is switched to the RECIRC side, current flows from TERMINAL 5 of the air inlet controlservo motor to TERMINAL 1 to TERMINAL (A) 13 of the integration control and panel to TERMINAL (B) 1 to GROUND.The motor rotates and the damper moves to the RECIRC side. When it is in the RECIRC position, current is cut inside theservo motor and the damper stops at that position.
∗ Switching from RECIRC to FRESHWith the ignition SW turned on, when the RECIRC/FRESH SW is switched to the FRESH side, current flows fromTERMINAL 5 of the air inlet control servo motor to TERMINAL 2 to TERMINAL (A) 15 of the integration control and panelto TERMINAL (B) 1 to GROUND, the motor rotates and the damper moves to the FRESH side. when it is in the FRESHposition, current is cut inside the servo motor and the damper stops at that position. When the ignition SW turned on, andmode SW (Integration control and panel) is at DEF or F/DEF position, it causes the damper to move to the FRESH side.Whether the RECIRC/FRESH SW (Integration control and panel) is on or not.
3. AIR CONDITIONING OPERATIONWhen the blower SW is on, current flows from the GAUGE fuse to the HEATER relay (Coil side) to TERMINAL 3 of theblower SW to TERMINAL 1 to GROUND, activating the HTR relay. This causes current to flow from the HTR fuse to the HTRrelay (Point side) to A/C fuse to TERMINAL (B) 12 of the A/C SW (Integration control and panel). When the A/C SW(Integration Control and panel) is turned on. Current flows from the A/C fuse to TERMINAL (B) 12 of the integration controland panel to TERMINAL (A) 8 to A/C magnetic clutch. Causing The compressor to operate.When blower SW is on and mode SW (Integration control and panel) is at DEF or F/DEF position, it causes A/C to runwhether A/C SW (Integration control and panel) is on or not.
SYSTEM OUTLINE
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HTR RELAY5–3 : Closed with ignition SW on and heater blower SW on
A1 A/C DUAL PRESSURE SW1–2 : Open with refrigerant pressure at less than approx. 2.0 kgf/cm2 (196.1 kpa, 28.4 psi) or
more than approx. 32.0 kgf/cm2 (3138.1 kpa, 455 psi)
I24 (A), I25 (B) INTEGRATION CONTROL AND PANEL(B) 4–GROUND : Approx. 12 volts with ignition SW at ON or ST position(B)12–GROUND : Approx. 12 volts with ignition SW on and blower SW on(B) 1–GROUND : Always continuity
: PARTS LOCATION
Code See Page Code See Page Code See Page
A130 (2UZ–FE) B6 34 J1 33 (5VZ–FE)
A132 (5VZ–FE) E3 A 34 J3 35
A2 B 32 (5VZ–FE) E4 B 34 J8 35
A3 A 30 (2UZ–FE) E5 C 34 J13 35
A13 34 E7 E 34J18
31 (2UZ–FE)
A15 34 I24 A 35J18
33 (5VZ–FE)
B4 34 I25 B 35
B5 34 J1 31 (2UZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1E22 (*2)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)1E26 (*1)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F22 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1F26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IE1
IE2 46 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE3
g ( g )
: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
IF 44 Left Kick Panel
II 44 Right Kick Panel
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E140 (2UZ–FE)
Engine Room Main WireI4
46 Cowl WireE142 (5VZ–FE)
Engine Room Main WireI16
46 Cowl Wire
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
SERVICE HINTS
2003 TOYOTA TUNDRA (EWD491U)
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I GROUND POINT
SUB BATT RELAY
DAYTIME RUNNINGLIGHT RESISTOR
FOG RELAY
DRL NO. 4 RELAY
EFI RELAY
HTR RELAY
BRAKE FLUID LEVELWARNING SW
A/C PRESSURE SW
ST RELAY
FRONT FOG LIGHT LH
FRONT FOG LIGHT RH
POWER OUTLET RELAY
FRONT TURN SIGNALLIGHT AND PARKINGLIGHT LH
FRONT TURN SIGNALLIGHT AND PARKINGLIGHT RH
CRUISE CONTROL SW[COMB. SW]
(E1)
(E02)
(E03)
(ME01)
(E01)
WASHER LEVELSENSOR
IGNITER ANDIGNITION COIL NO. 1
IGNITER ANDIGNITION COIL NO. 2
IGNITER ANDIGNITION COIL NO. 3
IGNITER ANDIGNITION COIL NO. 4
IGNITER ANDIGNITION COIL NO. 5
IGNITER ANDIGNITION COIL NO. 6
IGNITER ANDIGNITION COIL NO. 7
IGNITER ANDIGNITION COIL NO. 8
NOISE FILTER
DATA LINKCONNECTOR 3
2
2
C C
C
C
A
W–B
( *5)
A
A
A2
2
2
2
2
A
A
A
A
A
A
A
A
EA
A
IA518
E 5
E 5
E 5
EC
IE1
25
IE21
EB
I 3
(SG)
ENGINECONTROLMODULE
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–BW–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B
BR
BR
BR
BR
BR
BR
BR
BR
BR
BR BR
BRBR
BR
W–B
W–B
W–B
W–B
BR
W–B
BR
BR
BR
BR
W–B
W–B
JUNCTIONCONNECTOR
J18
JUNCTIONCONNECTOR
J 2
(*5)
(*5)
(TOWING PACKAGE)
(*1)
(*2)
(*1)
(2UZ–FE) (2UZ–FE)
2003 TOYOTA TUNDRA (EWD491U)
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HEATED OXYGENSENSOR(BANK 1 SENSOR 2)
NOISE FILTER
IGNITER
CRUISE CONTROL SW[COMB. SW]
(E1)
(E02)
(E03)
(E05)
(E01)
(ME01)
CIGARETTE LIGHTER
WIPER AND WASHER SW[COMB. SW]
PARKING BRAKE SW
POWER OUTLET
POWER OUTLET
TURN SIGNAL SW[COMB. SW]
LIGHT CONTROL SW[COMB. SW]
DATA LINKCONNECTOR 3
PERSONAL LIGHT
VANITY LIGHT RH
VANITY LIGHT LH
HIGH MOUNTED STOPLIGHT AND CARGOLIGHT
POWER RELAY
INTEGRATION RELAY
FUEL PUMP
POWER WINDOWCONTROL SW(BACK WINDOW)
BLOWER SW
I 3BD1
3
IE1
14
IE1
17
B 4
1A2
1J8
I 2
IF
BB1
12
I 2
I 2
ED
ID12ID22
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
BRBR
BRBRBR
BR
W–BBR
W–B
W–B
W–B
W–B
BR
BR
W–B
W–B
W–B
W–B
W–B
JUNCTIONCONNECTOR
J 3
(M/T)
W–B
W–B
A
A
A
A
A
A
(*3)(*4)
(5VZ–FE)
ENGINECONTROLMODULE
* 2 : W/O DAYTIME RUNNING LIGHT* 1 : W/ DAYTIME RUNNING LIGHT
* 3 : W/ CIGARETTE LIGHTER ILLUMINATION* 4 : W/O CIGARETTE LIGHTER ILLUMINATION* 5 : 2UZ–FE
IG
BRRADIO AND PLAYER
DATA LINKCONNECTOR 3
W–BIE115 W–B
(SG)
2003 TOYOTA TUNDRA (EWD491U)
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I GROUND POINT
PARK/NEUTRALPOSITION SW
DOOR LOCK MOTORAND DOOR UNLOCKDETECTION SWFRONT LH
POWER WINDOWMASTER SW
DOOR KEY LOCK ANDUNLOCK SW FRONT LH
REMOTE CONTROLMIRROR SW
MIRROR HEATER LH[REMOTE CONTROL MIRROR LH]
RHEOSTAT
GLOVE BOX LIGHT
O/D MAIN SW
SHORT PIN
CLUTCH START SW
(–S)
TURN SIGNAL FLASHER
TVIP ECU
SHORT CONNECTOR(TVIP)
TVIP BUZZER
COMBINATIONMETER
MIRROR HEATER SW
TOWING CONVERTER
SECURITY INDICATORAND GLASS BREAKAGESENSOR MICROPHONE
I 1IE2
19
B 3
B 2
BA
BA
BA
BA
BA
BA
AA
AA
AA
AA
IA4
3
I 1
I 1
(E)
BACK–UP LIGHT RELAY
DOOR COURTESY SWREAR LH UPPER
DOOR COURTESY SWREAR LH LOWER
BJ
IB31 BG23
BE26
AA
LICENSE PLATELIGHT LH
LICENSE PLATELIGHT RH
REAR COMBINATIONLIGHT LH
REAR COMBINATIONLIGHT RH
B10
B10
BL
BB23
W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–BW–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
JUNCTIONCONNECTOR
BJ23 , J24A
(5AZ–FE A/T) (5AZ–FE A/T)
(A/T)
(M/T)
(M/T)
(M/T)
(A/T)
CLUTCH STARTCANCEL SW
W–B
W–B
AA
(BRL)
W–B
(E2)
(E1)W–B
W–B
COMBINATIONMETER
I 1
W–B
W–B
LUMBAR SUPPORTCONTROL SW(DRIVER’ S SEAT)
POWER SEATCONTROL SW(DRIVER’ S SEAT)
BI11
A
AA
W–B
W–B
W–B
W–B
W–B
JUN
CTI
ON
CO
NN
EC
TOR
J17
TRAILER SOCKET
W–B
BK1
2W W
W–B
2003 TOYOTA TUNDRA (EWD491U)
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W–B
ABS ACTUATORWITH ECU
(GND)
(GND)
II
IF3
1DOOR KEY LOCK ANDUNLOCK SW RH
DOOR LOCK CONTROLSW RH
DOOR LOCK MOTORAND DOOR UNLOCKDETECTION SW RH
B 7
WIPER MOTOR
(E1)
4WD CONTROL ECU
TRANSMISSIONCONTROL RELAY
BLOWER RESISTOR
I 4
I 4
I 4
DETECTION SW(TRANSFER L4 POSITION)
TRANSFER SHIFTACTUATOR
DETECTION SW(TRANSFER 4WD POSITION)
DETECTION SW(TRANSFER NEUTRAL POSITION)
DOOR COURTESY SWREAR RH UPPER
DOOR COURTESY SWREAR RH LOWER
BF26
BH13
BK
I 3
W–B
W–B
W–B
W–B
W–B
W–B W–B W–B W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–BW–B
W–B
W–B
A
A
A
A
JUNCTIONCONNECTOR
J13
W–B
W–B
INTEGRATION CONTROLAND PANEL
W–B
IE17IE22
EC16
ED16EG16
ADD ACTUATOR
W–B
W–B
W–B
W–B
W–B
W–B
(* 6)(*7)
(*6)(*7)
( *6)
( *6)
( *7)
(* 5)
(*6, *7)
* 5 : 2UZ–FE
I 3
( *6,
*7)
(* 6)
(*6, *7)
(*6)
(*7)(*6, *7)
(5VZ–FE)
* 1 : W/ DAYTIME RUNNING LIGHT* 2 : W/O DAYTIME RUNNING LIGHT
(*6, *7)
16
1L
(E3)
CENTER AIRBAGSENSOR ASSEMBLY
BUCKLE SW LH
INTEGRATION RELAY
COMBINATIONMETER
FUEL SENDER
(E2)
SEAT BELT WARNINGOCCUPANT DETECTIONSENSOR AND BUCKLESW RH
IHIE
BB111
JUNCTIONCONNECTOR
BR BR
C
C
CC
BR
BR
W–B
W–B W–B
W–B
BR
J 8
A
MIRROR HEATER RH[REMOTE CONTROL MIRROR RH]
W–BW–B
INTEGRATION RELAY
BUCKLE SW LH
CENTER AIRBAGSENSOR ASSEMBLY
* 6 : 2UZ–FE 4WD* 7 : 5VZ–FE 4WD
W–B
W–B
C BR
BR
BI1
4
W–B
W–B
BR
(*1)
(*2)
W–B
(*9)
(*8) (*8)
* 8 : W/ POWER SEAT, BENCH SEAT* 9 : SEPARATE SEAT, CAPTAIN SEAT
24
1N
OPTION CONNECTORC BR
(W/O POWER SEAT)
W–B
2003 TOYOTA TUNDRA (EWD491U)
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I GROUND POINT
: PARTS LOCATION
Code See Page Code See Page Code See Page
J231 (2UZ–FE) J13 35 J23 A 35
J233 (5VZ–FE) J17 38 J24 B 35
J3 35J18
31 (2UZ–FE)
J8 35J18
33 (5VZ–FE)
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 21 Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1A22 (*2)
Roof Wire and Driver Side J/B (Lower Finish Panel)1A26 (*1)
Roof Wire and Driver Side J/B (Lower Finish Panel)
1J22 (*2)
1J26 (*1)
Cowl Wire and Driver Side J/B (Lower Finish Panel)1L 23 (*2)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
1N 27 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EC1 40 (2UZ–FE) Engine No.2 Wire and Engine Wire (Near the Starter)
ED1 40 (2UZ–FE) Engine No.2 Wire and Differential Wire (Near the Transmission)
EG1 42 (5VZ–FE) Engine Wire and Differential Wire (Front Differential Upper Side)
IA444 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IA544 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
IB3 44 Front Door LH Wire and Cowl Wire (Left Kick Panel)
ID146 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
ID246 Cigarette Lighter Wire and Cowl Wire (Instrument Panel Brace LH)
IE146 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IE246 Engine Wire and Cowl Wire (Right Side of Instrument Panel)
IF3 46 Front Door RH Wire and Cowl Wire (Right Kick Panel)
BB148 (Access Cab)
BB150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB248 (Access Cab)
Frame Wire and Cowl Wire (Under the Driver’s Seat)
BB250 (Standard Cab)
BD148 (Access Cab)
Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)BD150 (Standard Cab)
Frame Wire and Cowl Wire (Under the Front Passenger’s Seat)
BE2 48 (Access Cab) Floor No.2 Wire and Cowl Wire (Center of Left Rocker Panel)
BF2 48 (Access Cab) Floor No.1 Wire and Cowl Wire (Center of Right Rocker Panel)
BG2 48 (Access Cab) Floor No.2 Wire and Rear Door No.1 Wire LH (Under the Left Quarter Panel)
BH1 48 (Access Cab) Floor No.1 Wire and Rear Door No.1 Wire RH (Under the Right Quarter Panel)
BI1 52 Cowl Wire and Seat No.1 Wire (Under the Driver’s Seat)
BK148 (Access Cab)
Frame Wire and Frame No 3 Wire (Near the License Plate Light)BK150 (Standard Cab)
Frame Wire and Frame No.3 Wire (Near the License Plate Light)
* 1 : w/ Daytime Running Light * 2 : w/o Daytime Running Light * 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
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: GROUND POINTS
Code See Page Ground Points Location
EA40 (2UZ–FE)
Front Left FenderEA42 (5VZ–FE)
Front Left Fender
EB 40 (2UZ–FE) Rear Bank of Right Cylinder Head
EC 40 (2UZ–FE) Rear Bank of Left Cylinder Head
ED 42 (5VZ–FE) Intake Manifold Left
IE44 Left Kick Panel
IF44 Left Kick Panel
IG 44 Instrument Panel Brace RH
IH44 Right Kick Panel
II44 Right Kick Panel
BJ 48 (Access Cab) Inside of Rear Door LH
BK 48 (Access Cab) Inside of Rear Door RH
BL48 (Access Cab)
Surrounding of the Front of the Fuel TankBL50 (Standard Cab)
Surrounding of the Front of the Fuel Tank
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E5 40 (2UZ–FE) Engine Wire B3 50 (Standard Cab) Front Door LH Wire
I146 Cowl Wire B4
48 (Access Cab)Roof Wire
I246 Cowl Wire B4
50 (Standard Cab)Roof Wire
I3 46 Engine WireB7
48 (Access Cab)Front Door RH Wire
I4 46 Cowl WireB7
50 (Standard Cab)Front Door RH Wire
B248 (Access Cab)
B1048 (Access Cab)
Frame WireB250 (Standard Cab) Front Door LH Wire
B1050 (Standard Cab)
Frame Wire
B3 48 (Access Cab)
2003 TOYOTA TUNDRA (EWD491U)
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J POWER SOURCE (Current Flow Chart)
2003 TOYOTA TUNDRA (EWD491U)
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J
2003 TOYOTA TUNDRA (EWD491U)
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J POWER SOURCE (Current Flow Chart)
Driver Side J/B ( See Page 22 (w/o Daytime Running Light),
See Page 26 (w/ Daytime Running Light))
Fuse System Page
5A CARGO LPCargo Light
Integration Control and Panel
136
138
5A ECU IG
ABS
Headlight (w/ Daytime Running Light)
Light Auto Turn Off (w/ Daytime Running Light)
Light Auto Turn Off (w/o Daytime Running Light)
Power Window
TVIP and Wireless Door Lock Control
156
98
124
128
204
196
5A IGN
Charging
Combination Mater
Cruise Control (2UZ–FE)
Cruise Control (5VZ–FE)
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
SRS
74
234
160
164
144
150
76
88
169
5A STA
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
Starting (2UZ–FE)
Starting (5VZ–FE)
144
150
76
88
64
60
5A TURNTrailer Towing
Turn Signal and Hazard Warning Light
132
120
7.5A OBDEngine Control (2UZ–FE)
Engine Control (5VZ–FE)
76
88
10A GAUGE
ABS
Air Conditioning
Back–Up Light
Cargo Light
Charging
Combination Mater
Cruise Control (2UZ–FE)
Cruise Control (5VZ–FE)
Door Lock Control (w/ Daytime Running Light)
Door Lock Control (w/o Daytime Running Light)
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
156
240
108
136
74
234
160
164
184
190
144
150
76
88
∗ These are the page numbers of the first page on which the related system is shown.
2003 TOYOTA TUNDRA (EWD491U)
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J
Fuse System Page
10A GAUGE
Integration Control and Panel
Interior Light
Key Reminder and Seat Belt Warning
Mirror Heater
Starting (5VZ–FE)
Trailer Towing
Wiper and Washer (w/ Int Time SW Mechanism)
Wiper and Washer (w/o Int Time SW Mechanism)
4WD (2UZ–FE)
4WD (5VZ–FE)
138
116
210
226
60
132
220
224
174
180
10A HORNHorn
TVIP and Wireless Door Lock Control
218
196
15A ACC
Back–Up Light
Cigarette Lighter and Power Outlet
Clock
Cruise Control (2UZ–FE)
Cruise Control (5VZ–FE)
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Integration Control and Panel
Radio and Player
Remote Control Mirror
SRS
Trailer Towing
4WD (2UZ–FE)
4WD (5VZ–FE)
108
214
216
160
164
144
150
138
232
228
169
132
174
180
15A STOP
ABS
Cruise Control (2UZ–FE)
Cruise Control (5VZ–FE)
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
Stop Light
Trailer Towing
156
160
164
144
150
76
88
122
132
15A TAIL
Clock
Engine Control (2UZ–FE)
Headlight (w/ Daytime Running Light)
Illumination
Integration Control and Panel
Light Auto Turn Off (w/ Daytime Running Light)
Light Auto Turn Off (w/o Daytime Running Light)
Taillight
216
76
98
112
138
124
128
110
∗ These are the page numbers of the first page on which the related system is shown.
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J POWER SOURCE (Current Flow Chart)
Fuse System Page
15A TAILTrailer Towing
TVIP and Wireless Door Lock Control
132
196
20A WIPWiper and Washer (w/ Int Time SW Mechanism)
Wiper and Washer (w/o Int Time SW Mechanism)
220
224
20A 4WD4WD (2UZ–FE)
4WD (5VZ–FE)
174
180
30A POWER
Door Lock Control (w/ Daytime Running Light)
Door Lock Control (w/o Daytime Running Light)
Light Auto Turn Off (w/ Daytime Running Light)
Light Auto Turn Off (w/o Daytime Running Light)
Power Seat
Power Window
TVIP and Wireless Door Lock Control
184
190
124
128
230
204
196
Engine Room R/B (See Page 21)Fuse System Page
5A ECU–BEngine Control (2UZ–FE)
TVIP and Wireless Door Lock Control
76
196
7.5A ALT–S Charging 74
10A A/CAir Conditioning
Integration Control and Panel
240
138
10A DOME
Clock
Combination Mater
Door Lock Control (w/ Daytime Running Light)
Door Lock Control (w/o Daytime Running Light)
Integration Control and Panel
Interior Light
Key Reminder and Seat Belt Warning
SRS
TVIP and Wireless Door Lock Control
216
234
184
190
138
116
210
169
196
10A EFI NO.2Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
76
88
10A ETCS (2UZ–FE)Cruise Control (2UZ–FE)
Engine Control (2UZ–FE)
160
76
10A HEAD LH
Fog Light (w/o Daytime Running Light)
Headlight (w/ Daytime Running Light)
Headlight (w/o Daytime Running Light)
106
98
102
10A HEAD LLFog Light (w/ Daytime Running Light)
Headlight (w/ Daytime Running Light)
104
98
10A HEAD RH
Fog Light (w/o Daytime Running Light)
Headlight (w/ Daytime Running Light)
Headlight (w/o Daytime Running Light)
106
98
102
10A HEAD RL Headlight (w/ Daytime Running Light) 98
∗ These are the page numbers of the first page on which the related system is shown.
2003 TOYOTA TUNDRA (EWD491U)
255
J
Fuse System Page
15A EFI NO.1
Cruise Control (2UZ–FE)
Cruise Control (5VZ–FE)
Electronically Controlled Transmission and A/T Indicator (2UZ–FE)
Electronically Controlled Transmission and A/T Indicator (5VZ–FE)
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
160
164
144
150
76
88
15A ETCS (5VZ–FE) Cruise Control (5VZ–FE) 164
15A MIR HTR Mirror Heater 226
15A PWR OUTLET1 Cigarette Lighter and Power Outlet 214
15A PWR OUTLET2 Cigarette Lighter and Power Outlet 214
20A FOGFog Light (w/ Daytime Running Light)
Fog Light (w/o Daytime Running Light)
104
106
20A HAZTrailer Towing
Turn Signal and Hazard Warning Light
132
120
20A RADIO Radio and Player 232
30A AM2
Engine Control (2UZ–FE)
Engine Control (5VZ–FE)
Ignition (2UZ–FE)
Ignition (5VZ–FE)
Starting (2UZ–FE)
Starting (5VZ–FE)
76
88
68
72
64
60
30A ST3 Starting (2UZ–FE) 64
30A SUB BATT Trailer Towing 132
30A TOW BRK Trailer Towing 132
30A TOW TAIL Trailer Towing 132
30A TOWING Trailer Towing 132
40A ABS2 ABS 156
40A ABS3 ABS 156
40A AM1Cruise Control (5VZ–FE)
Starting (5VZ–FE)
164
60
50A HTR Air Conditioning 240
50A J/BIllumination
Taillight
112
110
100AALT (Except TowingPackage)
Charging
Cigarette Lighter and Power Outlet
Cruise Control (5VZ–FE)
Illumination
Starting (5VZ–FE)
Taillight
74
214
164
112
60
110
140A ALT (Towing Package)
Charging
Cigarette Lighter and Power Outlet
Illumination
Taillight
74
214
112
110
∗ These are the page numbers of the first page on which the related system is shown.
2003 TOYOTA TUNDRA (EWD491U)
256
K CONNECTOR LIST
1 2
GrayA 1
1
GrayA 2
213
GrayA 3
1 2
(2UZ–FE)A 4
1 2
(5VZ–FE) GrayA 4
9
19 20
11 12
3 4
21
13
5
22
214
1
1824
1716
6 87
25
15
23
10
BlackA 5
1 2
GrayA 6
1 2
GrayA 7
1 2 3 4
BlackA 8
1 2 3 4 5 6
BlackA 9
21
3 4
Dark GrayA10
21
YellowA11
21
YellowA12
21
A13
54321
BlackA15
1 2
YellowA16
1 2 3 4
YellowA17
1 2
BlackA18
1 23 4
GrayA19
1 2 3 4 5 6
BlackA20
35
1 2
GrayA22
1 2
GrayB 1
1 2
GrayB 2
35
1 2
B 3
1
2
B 4
1 23 4
BlackB 5
1 2 3
4 5 6 7 8
B 6
2 1
(Bench Seat)B 7
23 41
(*1)B 7
1 2
(w/ Power Seat)B 7
*1 : Separate Seat, Captain Seat (w/o Power Seat)
2003 TOYOTA TUNDRA (EWD491U)
257
K
1 2
GrayC 1
1 2
(2UZ–FE) GrayC 2
1 2
(5VZ–FE) BlackC 2
1 2 3 4 5 6
7 8 9 101112
A
YellowC 4
242523 26222021 2827
1 2 3 4 5 6
7 8 9 1011121314151617
1819
A B
YellowC 5
1 2 3 4 5 6
7 8 9 101112
A
YellowC 6
1
2
C 7
1 2
GrayC 8
1 23 4 56 7 8
BlackC 9
1 2
C10
13987654321 101112
BlueC11
1611109854321 1213146 7 15
C12
13987654321 101112
BrownC13
10987654321
GrayC14
1 2 4 7 8
9 10 1112131415 16 17
5 63
C15
7 8
1 2
12
4 5 6
9 1110
3
BlackC16
1 2 3 4 5 6 7 8 9
10 11 12 131415 16 17 18
BlackC17
1 2
GrayC18
21
GrayD 2
1 2
(2UZ–FE) GrayD 3
1 2
(5VZ–FE) BlueD 3
1 2
(2UZ–FE) GrayD 4
1 2
(5VZ–FE) BlueD 4
1 2
GrayD 5
2003 TOYOTA TUNDRA (EWD491U)
258
K CONNECTOR LIST
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
D 6
1 2 3
OrangeD 8
1 2
D 9
1 2
D10
1 2
BlackD11
1 2
D14
1 2
D15
1
D16
1
D17
1 2
GrayD18
1 2
D19
1 2
GrayD20
1 2
D21
3
1 2
GrayD22
3
1 2
GrayD23
1 2
3 4 5 6
D24
1 2 3 4
BlackD25
1 2 3 4
BlackD26
1 2
BlackD27
1 2
BlackD28
1 2
D29
1 2
BlackD30
1 2 3 4
5 6 7 8
(2UZ–FE) GrayE 1
1 2 3 4
5 6 7 8
(5VZ–FE) BlackE 1
21
(2UZ–FE) BlackE 2
21
(5VZ–FE) Dark GrayE 2
1
17
292827 3126
1918
98
20
10
21
30
11
76
13 14 15 16
22 23 24
12
432 5
25
(2UZ–FE)E 3
1 2 3 4 5 7
8 9 101112 15
1617 19 22
6
1314
202118
(5VZ–FE)E 3
16
3231 3528
2017
9 10
34
11
65
13 14 15
23 24 26
12
321 4
27
29
18
7
30
19
8
21 22 25
33
(2UZ–FE)E 4
1 3 4 5 6 9
10 12131415 19
20 22 24 28
7
1617
252623
2
11
21
8
18
27
(5VZ–FE)E 4
1
17
29 3228
1918
98
20
10
21
31
11
76
13 14 15 16
22 23 26
12
432 5
27
30
24 25
(2UZ–FE)E 5
2003 TOYOTA TUNDRA (EWD491U)
259
K
1 2 3 4 5 6
7 8 9 101112
131415 1617
(5VZ–FE)E 5
1
19
333231 3528
2320
118 12
34
13
76
15 16 17 18
24 25 26
14
432 5
27
29
21
9
30
22
10
(2UZ–FE)E 6
1
16141312118
24222017
2
109
1918 21
15
23
3 4 5 6 7
(5VZ–FE)E 6
1
17
29 3428
1918
98
20
10
21
33
11
76
13 14 15 16
22 23 26
12
432 5
2724 25
30 31 32
(2UZ–FE)E 7
211716151410
31272622
1311
2523
18
28
19
29
20
30
12
24
1 2 3 4 5 6 7 8 9
(5VZ–FE)E 7
1 2
BrownF 1
1 2
BrownF 2
1 2 3
GrayF 3
1 2 3
GrayF 4
1 2
Dark GrayF 5
1 2 3 4 5 6 7 8 9 1011 12 13
14 15161718192021222324 25 26
F 7
1
2
F 8
1
2
F 9
1 2 3
4 5
Dark GrayF10
1
(2UZ–FE)G 1
1
(5VZ–FE)G 1
21
3 4
BlackG 2
1 2
G 3
1
2 3
BrownH 1
1
2 3
BrownH 2
1 23 4
Dark GrayH 3
21
3 4
Dark GrayH 4
1 23 4
Dark GrayH 5
21
3 4
Dark GrayH 6
1
BlackH 7
1
BlackH 8
21
3 4
Dark GrayH 9
1 32
H10
1 2 3 4 5 109876
BlackI 2
2003 TOYOTA TUNDRA (EWD491U)
260
K CONNECTOR LIST
C
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
C
FF
CC
FF
CC
EE
BB
EE
BA
DD
A A
D
C
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
A B B C CA A B D D D C C
1 2 3 4
BlackI 3
1 2 3 4
BlackI 4
1 2 3 4
BlackI 5
1 2 3 4
BlackI 6
1 2 3 4
BlackI 7
1 2 3 4
BlackI 8
1 2 3 4
BlackI 9
1 2 3 4
BlackI10
1 2
BlackI11
1 2
BlackI12
1 2
BlackI13
1 2
(2UZ–FE) BlueI14
1 2
(5VZ–FE) BrownI14
1 2
(2UZ–FE) BlueI15
1 2
(5VZ–FE) BrownI15
1 2
(2UZ–FE) BlueI16
1 2
(5VZ–FE) BrownI16
1 2
(2UZ–FE) BlueI17
1 2
(5VZ–FE) BrownI17
1 2
(2UZ–FE) BlueI18
1 2
(5VZ–FE) BrownI18
1 2
(2UZ–FE) BlueI19
1 2
(5VZ–FE) BrownI19
1 2
BlueI20
1 2
BlueI21
1 2
BlueI22
1 2 3 4
5 6 7 8
I23
10111213 1718192021
1 2 3 4 5 6 7 8 9
141516
I24
643217 8 9 101112 14
513
I25
1
2
I26
A B B C CA A B D D D C C
BlueJ 1
BlueJ 2
A A
A A A A
J 3
C
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
J 4
J 5 J 7 J 8
2003 TOYOTA TUNDRA (EWD491U)
261
K
A A A AA A A AA A A A
A A A A A A
B B B C C C
A A A A A A
B B B C C C
A A B B C C
D D E E F F
A A B B C C
D D E E F F
A A B B C C
D E F G H I
C
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
C
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
A A
A A A A
A B B C CA A B D D D C CC
EE
CC
EE
CC
EE
BB
ED
BA
DD
A A
D
J 9 J10 BlueJ11
J12 J13
A A B B C C
D E F G H I
OrangeJ14
OrangeJ15
A A A A
BlackJ16
BlackJ17
A A A A AA A A A A A A A
J18 BlackJ19
BlackJ20 J21
J22 GrayJ23
GrayJ24
1
(2UZ–FE)K 1
1
(5VZ–FE) BlackK 1
1
(2UZ–FE) Dark GrayK 2
1
(5VZ–FE) BlackK 2
1 2
GrayL 1
1 2
GrayL 2
1 2 3 4
L 3
54321
BlackM 1
1 2
3 4 5 6
BlackM 4
1 2
GrayN 1
1 2
BlackO 1
1
GrayO 2
3 2 1
O 4
1 2
3 4 5
O 5
1 2 3 4 5
6 7 8 9
GrayP 1
1
BlackP 2
21 3 4
YellowP 3
1
GrayO 6
2003 TOYOTA TUNDRA (EWD491U)
262
K CONNECTOR LIST
1 2
GrayP 4
1
(A/T) BrownP 5
1 2
(M/T)P 5
1
2
P 6
1
2
P 7
1 32
P 8
1 2 3 4 5
P 9
1 2 3 4
5 6 7 8 9 10
P10
1 2
P11
1 2
P12
21
YellowP13
21
YellowP14
1 2
P15
1 2 3 4
5 6 7 8 9 10
BlackP16
1 2
BlueP17
1 2
P18
1 2
BlueP19
1
2
P20
1 2
3 4 5 6
P21
1 2
P22
1 2
3 4 5 6
R 1
1 2 3 4
5 6 7 8 9 10
R 2
1
2 3
R 3
1 2 34 5 6
GrayR 4
1 2 34 5 6
GrayR 5
1
2
R 6
1
2
R 7
12
34
56
(*2)R 8
123
(*3)R 8
12
34
56
(*2)R 9
123
(*3)R 9
1 2 3 4 5 6 7 8 9 10
R10
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
R11
1
(2UZ–FE)S 1
*2 : w/ Mirror Heater*3 : w/o Mirror Heater
2003 TOYOTA TUNDRA (EWD491U)
263
K
*6 : Except Towing Package
1
(2UZ–FE)S 1
1
(5VZ–FE)S 1
1
BlackS 2
1 2
BlackS 3
1
3
2
4
(*4) BlueS 4
1
3
2
4
(*5) BrownS 4
1 32
S 5
123
S 8
1 32
S 9
1 2 3 4
BlackS10
1 23 4
GrayT 1
1 2 3 4 5 6
(2UZ–FE) BlackT 2
1 2 3 4
(5VZ–FE) BlackT 2
1 2 3 4 5 6
BlackT 3
1 2
5
3 4
6 7 8 9 10
T 4
1 2 34 5 6 7 8
T 5
1 2 3 4
(*6) BlackT 6
*4 : w/ Cruise Control*5 : w/o Cruise Control
4 5
21
3
6 7
(Towing Package) BlackT 6
1 2
T 7
1 2
T 8
1 2 3
4 5 6 7 8 9
T 9
1 2
GrayT10
1 2 3 4 5 6
7 8 9 10 11 12
T11
1 2 3 4 5 6 7 8 9 10 11
12 131415161718192021 22
T12
1 2 34 5 6 7 8
BlackT13
1 2
U 1
2003 TOYOTA TUNDRA (EWD491U)
264
K CONNECTOR LIST
1 2 3
BlackV 1
1 2 3
BlackV 2
1 2
BlackV 3
1 2
BlackV 4
12
BlueV 6
12
BlueV 7
1 2
BlueV 9
124 3
Dark GrayW 2
1
(2UZ–FE) GrayW 3
1
(5VZ–FE) GrayW 3
1 2 3
4 5
BlackW 4
2003 TOYOTA TUNDRA (EWD491U)
265
MEMO
L PART NUMBER OF CONNECTORS
Code Part Name Part Number Code Part Name Part Number
Note: Not all of the above part numbers of the connector are established for the supply.
2003 TOYOTA TUNDRA (EWD491U)
266
A 1 A/C Dual Pressure SW 90980–11149
A 2 A/C Magnetic Clutch 90980–11271
A 3 A/C Magnetic Clutch and Lock Sensor 90980–11016
A 4A/T Oil Temp. Sensor (2UZ–FE) 90980–11025
A 4A/T Oil Temp. Sensor (5VZ–FE) 90980–10498
A 5 ABS Actuator with ECU 90980–11861
A 6 ABS Speed Sensor Front LH90980–11075
A 7 ABS Speed Sensor Front RH90980–11075
A 8 Accel Position Sensor 90980–11150
A 9 ADD Actuator 90980–11858
A10 Air Fuel Ratio Sensor (Bank 1 Sensor 1) 90980–11178
A11 Airbag Sensor Front LH90980–11898
A12 Airbag Sensor Front RH90980–11898
A13 A/C Thermistor 90980–11918
A15 Air Inlet Control Servo Motor 90980–11909
A16Airbag Squib (Front Passenger AirbagAssembly) 90980–11884
A17 Airbag Squib (Steering Wheel Pad) 90980–12160
A18 Ashtray Illumination –
A19 ABS Speed Sensor Rear 90980–10942
A20 Accelerator Pedal Position Sensor 90980–11858
A22 ACC Cut Relay 82660–53010
B 1 Back–Up Light SW 90980–11250
B 2 Brake Fluid Level Warning SW 90980–11207
B 3 Back–UP Light Relay 82660–20340
B 4 Blower Motor 90980–10214
B 5 Blower Resistor 90980–10171
B 6 Blower SW and Defroster Mode SW 90980–10877
Buckle SW LH (Bench Seat) 90980–10824
B 7Buckle SW LH (Separate Seat, CaptainSeat (w/o Power Seat)) 90980–10795
Buckle SW LH (w/ Power Seat) 90980–10825
C 1 Camshaft Position Sensor 90980–10947
C 2Crankshaft Position Sensor (2UZ–FE) 90980–11162
C 2Crankshaft Position Sensor (5VZ–FE) 90980–10947
C 4 Center Airbag Sensor Assembly 90980–11873
C 5 Center Airbag Sensor Assembly 90980–11872
C 6 Center Airbag Sensor Assembly 90980–11871
C 7 Cigarette Lighter 90980–10760
C 8 Cigarette Lighter Illumination 90980–11148
C 9 Clutch Start Cancel SW 90980–11533
C10 Clutch Start SW 90980–10825
C11 Combination Meter 90980–11114
C12 Combination Meter 90980–11113
C13 Combination Meter 90980–11115
C14 Combination Meter 90980–11116
C15 Combination SW 90980–11672
C16 Combination SW 90980–12183
C17 Combination SW 90980–11594
C18 Cruise Control Clutch SW 90980–10906
D 2 Daytime Running Light Resistor 90980–10928
D 3
Detection SW (Transfer 4WD Position)(2UZ–FE) 90980–11250
D 3Detection SW (Transfer 4WD Position)(5VZ–FE) 90980–11156
D 4
Detection SW (Transfer L4 Position)(2UZ–FE) 90980–11025
D 4Detection SW (Transfer L4 Position)(5VZ–FE) 90980–11156
D 5 Detection SW (Transfer Neutral Position) 90980–10923
D 6 Data Link Connector 3 90980–11665
D 8 Diode (A/T) 90980–11071
D 9 Diode (Door Courtesy)90980–11608
D10 Diode (Idle–Up)90980–11608
D11 Diode (Power Window System) 90980–10962
D14 Door Courtesy Light LH90980–11148
D15 Door Courtesy Light RH90980–11148
D16 Door Courtesy SW Front LH90980–10871
D17 Door Courtesy SW Front RH90980–10871
D18 Door Courtesy SW Rear LH Lower
D19 Door Courtesy SW Rear LH Upper90980–11003
D20 Door Courtesy SW Rear RH Lower90980–11003
D21 Door Courtesy SW Rear RH Upper
D22 Door Key Lock and Unlock SW LH90980–11245
D23 Door Key Lock and Unlock SW RH90980–11245
D24 Door Lock Control SW RH 90980–10797
D25Door Lock Motor and Door UnlockDetection SW LH
90980–11150D26
Door Lock Motor and Door UnlockDetection SW RH
90980–11150
D27 Diode (Step Light)90980–10962
D28 Diode (Door Lock)90980–10962
D29 Diode (TVIP) 90980–11608
D30 Diode (Unlock Warning) 90980–10962
E 1Electronically Controlled TransmissionSolenoid 90980–10891
E 2Engine Coolant Temp. Sensor (2UZ–FE) 90980–10736
E 2Engine Coolant Temp. Sensor (5VZ–FE) 90980–10737
E 3Engine Control Module (2UZ–FE) 90980–12142
E 3Engine Control Module (5VZ–FE) 90980–11638
E 4Engine Control Module (2UZ–FE) 90980–12146
E 4Engine Control Module (5VZ–FE) 90980–11637
E 5Engine Control Module (2UZ–FE) 90980–12143
E 5Engine Control Module (5VZ–FE) 90980–11586
L
Code Part Name Part Number Code Part Name Part Number
2003 TOYOTA TUNDRA (EWD491U)
267
E 6Engine Control Module (2UZ–FE) 90980–12145
E 6Engine Control Module (5VZ–FE) 90980–11476
E 7Engine Control Module (2UZ–FE) 90980–12144
E 7Engine Control Module (5VZ–FE) 90980–11421
F 1 Front Fog Light LH90980–11096
F 2 Front Fog Light RH90980–11096
F 3Front Turn Signal Light and Parking LightLH
90980–11020F 4
Front Turn Signal Light and Parking LightRH
90980–11020
F 5 Fuel Pump Resistor 90980–10901
F 7 4WD Control ECU 90980–11423
F 8 Front Door Speaker LH90980–10935
F 9 Front Door Speaker RH90980–10935
F10 Fuel Pump and Sender 90980–11077
G 1Generator (2UZ–FE) 90980–09365
G 1Generator (5VZ–FE) 90980–09212
G 2 Generator 90980–11964
G 3 Glove Box Light 90980–11148
H 1 Headlight LH90980–11314
H 2 Headlight RH90980–11314
H 3 Heated Oxygen Sensor (Bank 1 Sensor 1) 90980–10869
H 4 Heated Oxygen Sensor (Bank 1 Sensor 2) 90980–11028
H 5 Heated Oxygen Sensor (Bank 2 Sensor 1) 90980–10869
H 6 Heated Oxygen Sensor (Bank 2 Sensor 2) 90980–11028
H 7 Horn LH90980–10619
H 8 Horn RH90980–10619
H 9 Heated Oxygen Sensor (Bank 1 Sensor 2) 90980–11028
H10 High Mounted Stop Light and Cargo Light 90980–11296
I 2 Igniter 90980–11653
I 3 Igniter and Ignition Coil No.1
I 4 Igniter and Ignition Coil No.2
I 5 Igniter and Ignition Coil No.3
I 6 Igniter and Ignition Coil No.490980–11885
I 7 Igniter and Ignition Coil No.590980–11885
I 8 Igniter and Ignition Coil No.6
I 9 Igniter and Ignition Coil No.7
I10 Igniter and Ignition Coil No.8
I11 Ignition Coil No.1
I12 Ignition Coil No.2 90980–11246
I13 Ignition Coil No.3
I14 Injector No.1
I15 Injector No.2
I16 Injector No.390980–11153
I17 Injector No.490980–11153
I18 Injector No.5
I19 Injector No.6
I20 Injector No.790980–11153
I21 Injector No.890980–11153
I22 Ignition Key Cylinder Light 90980–10906
I23 Ignition SW 90980–11615
I24 Integration Control and Panel 90980–11125
I25 Integration Control and Panel 90980–10807
I26 Interior Light 90980–10935
J 1 Junction Connector90980–11714
J 2 Junction Connector90980–11714
J 3 Junction Connector 90980–10976
J 4 Junction Connector
J 5 Junction Connector
J 7 Junction Connector90980–11915
J 8 Junction Connector90980–11915
J 9 Junction Connector
J10 Junction Connector
J11 Junction Connector 90980–11714
J12 Junction Connector 90980–11915
J13 Junction Connector 90980–10976
J14 Junction Connector90980–11661
J15 Junction Connector90980–11661
J16 Junction Connector90980–11398
J17 Junction Connector90980–11398
J18 Junction Connector 90980–11542
J19 Junction Connector90980–11398
J20 Junction Connector90980–11398
J21 Junction Connector
J22 Junction Connector90980–11661
J23 Junction Connector90980–11661
J24 Junction Connector
K 1 Knock Sensor 190980–11166
K 2 Knock Sensor 290980–11166
L 1 License Plate Light LH90980–11162
L 2 License Plate Light RH90980–11162
L 3 Lumber Support Control SW (Driver’s Seat) 90980–10601
M 1 Mass Air Flow Meter 90980–11317
M 4 Mirror Heater SW 90980–10797
N 1 Noise Filter 90980–10843
O 1 O/D Direct Clutch Speed Sensor 90980–11156
O 2 Oil Pressure SW 90980–11363
O 4 O/D Main SW 90980–11470
O 5 Option Connector 90980–11603
O 6 Oil Pressure Sender 90980–11363
P 1 Park/Neutral Position SW 90980–11784
P 2 Power Steering Oil Pressure SW 90980–11428
P 3 Passenger Airbag Manual On–Off SW 90980–12017
L PART NUMBER OF CONNECTORS
Code Part Name Part Number Code Part Name Part Number
Note: Not all of the above part numbers of the connector are established for the supply.
2003 TOYOTA TUNDRA (EWD491U)
268
P 4 Passenger Airbag Manual On–Off SW 90980–10906
P 5Parking Brake SW (A/T) 90980–10871
P 5Parking Brake SW (M/T) 90980–10825
P 6 Power Outlet90980–10760
P 7 Power Outlet90980–10760
P 8 Personal Light 90980–10908
P 9 Power Window Control SW RH 90980–10789
P10 Power Window Master SW 90980–10997
P11 Power Window Motor Front LH90980–10860
P12 Power Window Motor Front RH90980–10860
P13 Pretensioner LH90980–11862
P14 Pretensioner RH90980–11862
P15Power Seat Motor (Driver’s Seat FrontVertical Control) 90980–10825
P16 Power Seat Control SW (Driver’s Seat) 90980–10997
P17Power Seat Motor (Driver’s Seat RearVertical Control)
P18Power Seat Motor (Driver’s Seat RecliningControl) 90980–10825
P19Power Seat Motor (Driver’s Seat SlideControl)
P20Power Seat Motor (Driver’s Seat LumberSupport Control) 90980–10935
P21 Power Window Control SW (Back Window) 90980–10996
P22 Power Window Motor (Back Window) 90980–10860
R 1 Radio and Player 90980–10996
R 2 Radio and Player 90980–10997
R 3 Rheostat 90980–10216
R 4 Rear Combination Light LH90980–10988
R 5 Rear Combination Light RH90980–10988
R 6 Rear Door Speaker LH90980–10935
R 7 Rear Door Speaker RH90980–10935
Remote Control Mirror LH (w/ Mirror Heater) 90980–11452
R 8 Remote Control Mirror LH (w/o MirrorHeater) 90980–10907
Remote Control Mirror LH (w/ Mirror Heater) 90980–11452
R 9 Remote Control Mirror RH (w/o MirrorHeater) 90980–10907
R10 Remote Control Mirror SW 90980–11657
R11 Radio and Player 90980–12259
S 1Starter (2UZ–FE) 90980–09585
S 1Starter (5VZ–FE) 90980–09507
S 2 Starter 90980–11400
S 3 Step Light 81945–33010
S 4 Stop Light SW 90980–11118
S 5Seat Belt Warning Occupant DetectionSensor 90980–11296
S 8 Short Pin 90980–10907
S 9 Short Connector (TVIP) 90980–10908
S10Security Indicator and Glass BreakageSensor Microphone 90980–11013
T 1 Throttle Control Motor 90980–10942
T 2Throttle Position Sensor (2UZ–FE) 90980–11858
T 2Throttle Position Sensor (5VZ–FE) 90980–10711
T 3 Transfer Shift Actuator 90980–11858
T 4 Transmission Control Relay 90980–10801
T 5 Turn Signal Flasher 90980–10799
T 6Trailer Socket (Except Towing Package) 82824–34040
T 6Trailer Socket (Towing Package) 82824–34030
T 7 Tweeter LH90980–10906
T 8 Tweeter RH90980–10906
T 9 Trailer Converter 90980–11535
T10 TVIP Buzzer 90980–11051
T11 TVIP ECU 90980–11424
T12 TVIP ECU 90980–11392
T13 TVIP ECU 90980–10799
U 1 Unlock Warning SW 90980–10860
V 1 Vapor Pressure Sensor90980–11143
V 2 Vehicle Speed Sensor (Combination Meter)90980–11143
V 3Vehicle Speed Sensor (ElectronicallyControlled Transmission) 90980–11156
V 4 VSV (EVAP)90980 11156
V 6 Vanity Light LH90980–11368
V 7 Vanity Light RH90980–11368
V 9 VSV (Canister Closed Valve) 90980–11859
W 2 Washer Motor and Washer Level Sensor 90980–11177
W 3Water Temp. Sender (2UZ–FE) 90980–11428
W 3Water Temp. Sender (5VZ–FE) 90980–10359
W 4 Wiper Motor 90980–11599
L
Code Part Name Part Number Code Part Name Part Number
2003 TOYOTA TUNDRA (EWD491U)
269
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
1 TOYOTA TUNDRA ELECTRICAL WIRING DIAGRAM
P ow er S ource
2
7
ACC
IG1
IG2
ST2
AM1 4
8
6AM2
2
1I2
2
22
1
2
5
3
2 2
2 2
2
1
1 B1A
3 EB1
N
6
P
1F7
1I4
1F101E5
3 B
1A
2B
4B
4
3
A
A
7 IA5
C C
IE Left kickpanel
A
2
2 EB1
1 EB14 EB1
A
2
22
11
1
9
B–L (*1 )
B (*2 )
WWB
W–R
WG
–R
B–W
W–B
W–B
W–B
B–R
B–OY
–GY
–G
Y–G(*4 )
Y–G
B–YBW
B–Y B–YP
B–Y
G–B
B–RW–R
B–R
B
W
B–L
B–Y
(M/T)
(*3 )(*3 )
(A/T )
PP
(A/T )
(A/T )
B–Y(M
/T )
STARTER
W
(M/T )
5AIGN
1 7
3 5
GENERATOR
J 1JUNCTIONCONNECTOR
J11JU
NC
TION
CO
NN
EC
TOR
Y–G
10AGAUGE
ST RE
LAY
7. 5A ALT–S
40A A
M1
140A ALT (*1 )
100A ALT (*2 )
S ta rting (5V Z –FE ) C harg ing
* 1 : Towing Package* 2 : Except Towing Package* 3 : w/ Daytime Running Light* 4 : w/o Daytime Running Light
J 8JUNCTIONCONNECTOR
30A A
M2
I23IGNITION SW
BATTER
Y
BW
A
Y–G
To IntegrationR
elay<7–3>
(*3 )
1
2 P 1
PA
RK
/NE
UTR
AL
PO
SITIO
N S
W
C10
CLU
TCH
STA
RT SW
W–B
(M/T )
W–B
(M/T )
(M/T )
PP
W–B
B–W
G–B
, G 2G 1 A B
C 9CLUTCH STARTCANCEL SW
, S 2S 1 A B
A
P
From Engine ControlModule<6–9>
+S IG
–S E
S B
IG
L
C12
CH
AR
GE
WA
RN
ING
LIGH
T[C
OM
B. M
ETE
R]
(A/T )
24 IA4
(M/T)
PP
B–W
1I3
5A STA
1F6
BTo EngineC
ontrol Module
<6–9>
B–WCC
C
P(* 6)
From TVIP
EC
U<
23–3>
(*5)
To TVIP
ECU
<23–3>
G–R
(*5 )
(*6 )
12 IE2
19 IE2
W–B
(A/T )
A B
A A
W–B
J23 J24,
JUNCTIONCONNECTOR
A B
W–B W–B
* 5 : w/ Wireless Door Lock Control* 6 : w/o Wireless Door Lock Control
J 2JUNCTIONCONNECTOR
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
2 T
OY
OT
A T
UN
DR
A
Po
we
r S
ou
rce
2
22
12
53
22
22
2 1
1B
1 A3EB
1
N
6
P
9
B–L(*1) B (*2)W–R
W–B G–R
B–W
W–B
B–W
B
P
STAR
TER
5A STA
ST RELAY
30A ST3
Sta
rtin
g (
2U
Z–
FE
)
* 1
: Tow
ing
Pac
kage
* 2
: Exc
ept T
owin
g Pa
ckag
e*
3 : w
/ Wire
less
Doo
r Loc
k C
ontro
l*
4 : w
/o W
irele
ss D
oor
Lock
Con
trol
30A AM2
I23
IGN
ITIO
N S
W
BATT
ERY
P 1PARK/NEUTRALPOSITION SW
P
B–W
, S
2S
1A
B
A
24IA
4
7IG
2
ST2
8
AM2
12IE
1
CC EAFr
ont l
eft
fend
er
AA
J 2
JUN
CTI
ON
CO
NN
EC
TOR
J18
JUN
CTI
ON
CO
NN
EC
TOR
J20
JUN
CTI
ON
CO
NN
EC
TOR
W–R
G–Y
G–Y
W–B W–B W–B
A
A
P P
P P ( *3)
(*4)
From
Eng
ine
Con
trol
Mod
ule(
STA)
<5–
14>
To T
VIP
EC
U<
23–3
>
From TVIP ECU<23–3>
To Engine ControlModule(STAR)<5–10>
To Engine ControlModule(NSW)<5–10>
G–R
(*3)
(*4)
W–B
W–B
To E
ngin
e C
ontro
lM
odul
e(S
TSW
) <5–
14>
1I3
1F6
B
B–W
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
3 TOYOTA TUNDRA
2
2
7 6
1I4
21 IE1
1J7
2
1 1 3
4 2
1 3
4 2
1 3
4 2
1 3
4 2
1 3
4 2
1 3
4 2
1 3
4 2
1 3
4 2
From Engine Control Module<5–13><5–14>
BR BR BR BR BR BR
L–B L–B L–B
L–W L–W
To Engine Control Module<5–13>
BATTERY
2
1
I23IGNITION SW
B–R
W–R
B–L (*1 ) B (*2 )
B–R
B–R
B–R
B–R
B–R
BR
BR
L–B
BR
L–W
BR
L–W
BR
L–B
BR
L–W
BR
L–B
BR
L–B
BR
L–W
B–R
B–R
B–R
B–R
LG
R–W
P–L
G–W
B–L
G–B
LG–B
G–R
BR
L–B
L–W
P ow er S ource Ign ition (2UZ –FE )
30A AM
2
B–R
IG2
ST2
6AM2
B–R B–R B–RB–R
EC Rear bank ofleft cylinder head
I 4IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 2
I 5IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 3
I 6IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 4
I 7IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 5
I 8IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 6
I 9IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 7
I10IG
NITE
R A
ND
IGN
ITION
CO
IL NO
. 8
I 3IGN
ITER
AN
DIG
NITIO
N C
OIL N
O. 1
N 1
NO
ISE FILTE
R
BR
* 1 : Towing Package* 2 : Except Towing Package
B–RB–RB–RB–R
L–W
B–R
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
4 T
OY
OT
A T
UN
DR
A
7IG
2
ST2
6A
M2
2
1I4
1J7
30A
AM
2
2
1IE
1
21
21
21
21
ED
Inta
ke m
anifo
ld le
ft
12
37
65
489
12
10
W–R B
B–R
B–R
B–R
B–R W–G
L
R W–B
BR
B–R
B
B–RB–R
B–R
I 2 IGN
ITER
B–Y
LG
R–L
B–L
I23
IGN
ITIO
N S
W
BATT
ERY
I11IGNITION COIL NO. 1
I12IGNITION COIL NO. 2
I13IGNITION COIL NO. 3
N 1NOISE FILTER
To E
ngin
e C
ontro
l Mod
ule
<6–
9><
6–10
>
To Combination Meter<29–3>
Po
we
r S
ou
rce
Ign
itio
n (
5V
Z–
FE
)
B–R
B–R
W–B
2003 TOYOTA TUNDRA (EWD491U)
MEMO
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
34
21
( Con
t. n
ext
page
)5
TO
YO
TA
TU
ND
RA
10A ETCS
30A AM2
50A J/B
15A EFI NO. 1
222
2
22
2
2
2
1
1
1
15 3
2 1
22
22
Fron
t lef
t fen
der
EA
3 5
2 1
4
3 5
2 1F/PMP RELAY
22
22
C/OPN RELAY
22
EFI RELAY
22
2 IA4
5
BB
13
54 M BB
112
IFLe
ft ki
ck p
anel
26IA
4
EC
Rea
r ba
nk o
fle
ft cy
linde
r hea
d
21
CG
SG
SIL
B–L(*1) B (*2)
W–GY
W–R
W–G
B–R
B–R
W–B
Y
B–W
YB–W
W–L
L–O L–O L–O W–B W–B
W–B
BR
W
BR
B–L
Y
D75
4
AA
D
B–R
I23
IGN
ITIO
N S
W
BATT
ERY
J 3
JUN
CTI
ON
CO
NN
EC
TOR
J 5
JUN
CTI
ON
CO
NN
EC
TOR
Po
we
r S
ou
rce
En
gin
e C
on
tro
l ( 2
UZ
–F
E)
140A ALT(*1)100A ALT(*2)40A AM1
2 7
AC
C
IG1
IG2
ST2
AM1
4 6AM
2
2
2 1 2 1
W
B–Y
W
25IE
1
From
AB
SA
ctua
tor
with
EC
U<
16–3
>
From
Cen
ter
Airb
ag S
enso
rA
ssem
bly<
17–4
>
From CenterAirbag SensorAssembly<17–4>
W
D
D
W–G
W–G
W–G
J 8
JUN
CTI
ON
CO
NN
ECTO
R
B–L
16 BAT
D 6
DAT
A LI
NK
CO
NN
EC
TOR
3
From ABS Actuatorwith ECU<16–3>
W
D
B–W
F 5
FUEL
PU
MP
RE
SIS
TOR
F10FUEL PUMP
L–B
L–O
W–B
B–W
DD
W–G
D
13
TC
15 WFS
E
L–W
B–YFrom Center AirbagSensor Assembly<17–4>
W–L
TS
1211
A/B From ABS Actuator
with ECU<16–4>
7. 5
AO
BD
2
5A ECU
–B
12
12
43
DA
FB
17IA
5
8IE
1JUNCTIONCONNECTOR
BAJ21 J22,
W–R
W–R
G–Y G–Y
SHORT PINB
2 1
W–R
W–R
(*4)
(*3)
A22
ACC
CU
TR
ELA
Y
W–L
B–Y
W–L
W–R(*3)
L–R
A B C F G H I J K L M
W–G W Y
L–W
B–WB–RB–Y
B–R
W–G
B–Y
G–Y
W–L
D E
* 1
: Tow
ing
Pac
kage
* 2
: Exc
ept T
owin
g P
acka
ge
1B4
1K2
AA
J18JUNCTIONCONNECTOR
W–B
9IA
4 L–R
3L–
R
2 2
L–O
* 3
: w/ D
oor
Lock
Con
trol
* 4
: w/o
Doo
r Loc
k C
ontro
l
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M5 TOYOTA TUNDRA (Cont’ d) (Cont. next page)
5 6 87
1 IA5
6 B
10 A18 A2 A A201 A27 E 33 D 22 D D4 23 D
1 E
1
2
3 E
1
2
5 E
1
2
6 C
1
2
2 E
1
2
4 E
1
2
3 D
1
2
5 C
1
2
4 1I
5AIGN
8 A 3 A
1J7
11 1F
1K6
9 A
IE13
33 E
B–L
B–O
B–O
B–R
B–Y
W
W–G
W–L
W–L
L–W
B–O
W–G
R G L L–RB
–R
B–R
B–R
B–R
B–R B–R
W–G
B–R
B–Y
B–R
Y WY–GR
B–W
1 3
2 4 2
B
B
B–RB–R
B–R
B–RB
–R
B–R
B–R
B–R
R–WYR–B
W
R
B–W
B
G–Y
1 3
4
R
B–W
R
OX1AHT1AOX2AHT2AFCSILTC+B2+BCCVIGSW FPR
R
R
I14IN
JEC
TOR
NO
. 1
I16IN
JEC
TOR
NO
. 3
I18IN
JEC
TOR
NO
. 5
I20IN
JEC
TOR
NO
. 7
I15IN
JEC
TOR
NO
. 2
I17IN
JEC
TOR
NO
. 4
I19IN
JEC
TOR
NO
. 6
I21IN
JEC
TOR
NO
. 8(*5 )
(*5)
H 5
HEA
TED
OXY
GE
N S
ENS
OR
(Bank 2 Sensor 1 )
H 3
HEA
TED
OXY
GE
N S
ENS
OR
(Bank 1 Sensor 1 )
E 3 E 4,
ENGINE CONTROL MODULE
A B E 5, C E 6, D
E ngine C on tro l (2UZ –FE )
13 B
PI
B–R
R
* 5 : Shielded
11 A
W
V–G
6 IA4IA415
B–O
+B E1
OXHTR HTL OX2
+B E1
MREL BATT +BM #1 #3 #5 #7 #2 #4 #6 #8
19 A
L–W
WFSE
23 IE1
8 EA1
B–L
16 IE1
B–R B–R
14 IA4
2
10AEFINO. 2
2
W–L
R
R
W–L
R
W–L
R
W–L
B
A A
BB
A
J 8JU
NC
TION
CO
NN
EC
TOR
1I2
2
1
10AGAUGE
1F5
9 A
9 C
B–Y
B–Y
IE11
R
MALFU
NC
TION
IND
ICA
TOR
LAMP
CR
UIS
E
8 C
C11
C13
,
CO
MB
INATIO
N M
ETER
AC
R
J 1JU
NC
TION
CO
NN
EC
TOR
H A
H B
F B
G A
2
1
RL–W
JUN
CTIO
NC
ON
NE
CTO
R
BA
J14J15
,
JUN
CTIO
NC
ON
NE
CTO
R
BA
J14J15
, V
9V
SV(C
anister C
losed Valve )
W–G
B–L
W
L–W
Y
A
B
C
D
E
F
G
H
I
J
K
L
M
B–R
B–R
B–Y
W–G
B–W
B–Y
G–Y
W–L
15 E
ACCR
A
B
C
D
E
B–O
BR
J 5JU
NC
TION
CO
NN
EC
TOR
B
B–W
V–G
B–R
B–R
18 IA4
L–W
E 7, E
B–L
L–W
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
11
12
109
5 T
OY
OT
A T
UN
DR
A
EB
Rea
r ban
k of
right
cyl
inde
r hea
d
4C
7C
6E
7E
11
2D
1D
R
20E
29E
30E
28E
21
19E
G–B
21E
31E
E18
Y–G
B–Y
R–W
B–W B–W
R
15
423
BR BR
GR
B
K 1KNOCK SENSOR 1
K 2KNOCK SENSOR 2
B
GR
L
G
W–B
W–B
W–B
W–B
GB–W
B–W
B–Y
P–L
KNK1
KN
K2M
E01
E03
E02
E01
G–B
B–W
3T 2THROTTLE POSITIONSENSOR
64
5
25C
C32
C27
21
( *5)
(*5)
(*5)
( *5)
( *5)
Y
12
C 1
CA
MS
HA
FT P
OSI
TIO
NS
ENSO
R
C 2
CR
AN
KS
HA
FT P
OSI
TIO
NS
ENS
OR
(*5)
(*5)
M 1
MA
SS
AIR
FLO
W M
ETE
R
E 2ENGINE COOLANTTEMP. SENSOR
B–WD
, E
6C
, E
5B
A
ENG
INE
CO
NTR
OL
MO
DU
LE
, E
4E
3En
gin
e C
on
tro
l ( 2
UZ
–F
E)
B–W
B
B–O
A
4B
16E
To Detection SW(Transfer L4 Position)<18–4>
From Park/NeutralPosition SW<2–3>
W–B
L–R
G2
G2–
NE
+
L4N
SWTH
AE2
GVG
E2
THW
VTA1
VTA2
VC
C24
NE
–
D25
21D
D5
29D
C1
Rea
r ba
nk o
fle
ft cy
linde
r he
adE
C
2C
C3
17C
W
R
BR
B–W
BR
R
B–W
R
B–W
W
R–Y
B
13
13
24
42
BR BR BR
E1O
X1B
HT1
BO
X2B
HT2
B
21
BR B
R( *
5)
H 4HEATED OXYGENSENSOR(Bank 1Sensor 2)
H 6HEATED OXYGENSENSOR(Bank 2Sensor 2)
Y–B
B–W
2 1
R W–G
V 4VSV(EVAP)
34E
(*5)
BR
+BE
1
HTR
2O
XR2
HTL
2O
XL2
+BE
1
12A
2B
G–Y
L–Y
To Integration Controland Panel<30–3>
33B
L–B
From Diode (Idle–Up)<9–4>
BR(*5)
GE0
1M
–M
+P
RG
ELS
ACLD
AC
MG
C D E
BR B–W R
A B C
AAA
J19JUNCTIONCONNECTOR
3E
C2
2EC
21
EC2
BR
DB–
W
B–O
B–W
G–B
G–B
9D
From Park/NeutralPosition SW<2–3>
W–B
STA
R
( Con
t. n
ext
page
)
E,
E 7
* 5
: Shi
elde
d
M–
M+
VTA1
VTA2
VCE2
(*5)
R
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
15 161413
5 TOYOTA TUNDRA (Cont’ d)
E24
To Igniter and Ignition CoilNo. 1, No. 2, No. 3, No. 4No. 5, No. 6, No. 7 and No. 8<3–2><3–3><3–4>
L–B
L–W
G–W
P–L
R–W
R–L
R–L
22 IE1
18 IE1
A21
E23 E8 E9
LG–B
G–R
V 1VAPOR PRESSURE SENSOR
25 E
G–B
G–B
B–W
B–W
2 3 1
G–B
B–L
LG
12 E 26 E 13 E 10 EE11 19 B
12 C
BFrom
”STA”
Fuse<
2–3>
E ngine C on tro l (2UZ –FE )
17 B
G–O
5 A
L–W
To C
ombination M
eter<
29–3>
From S
top Light SW<
13–4>G
–W
4
3
12 BB
–OL–B
RES/ACC
SET/COAST
CANCEL
EC Rear bank ofleft cylinder head
5 IE1
5
4
BR
C16CRUISE CONTROL SW[COMB. SW]
C ru ise Con trol(2U Z–F E)
ECC
CCS
CR
UISE
IGF1 IGF2 IGT2 IGT1 IGT3 IGT4 IGT5 IGT6 IGT7 IGT8 STP
PTNK STSW SPD TACH STI–
S 4
STO
P LIGH
TS
W
1
2
See Stop LightSystem<13–4>
From Igniter and
Ignition Coil
No. 1, N
o. 2, No. 3, N
o. 4N
o. 5, No. 6, N
o. 7 andN
o. 8<3–4>
A
B
C
DB–W
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B–W
G–B
D, E 6C, E 5BA
ENGINE CONTROL MODULE
, E 4E 3
E A
H B I B G B
D A F A
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B
B
23 C 24 B
2 II1
LCK1 CCS
14 A
1 II1
From C
enterA
irbag SensorA
ssembly<
17–3>
17 E
To Park/N
eutralP
osition SW
<2–3>
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STA
15 IE1
B
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1
2
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A/C
LOC
K SE
NS
OR
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R–B
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LTo Integration C
ontroland Panel<
30–5>
B31 8 D
To AD
D D
etectionS
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18–6>G
R
4WD
EAFront leftfender
A
A
C
C
2
1
17 IA4
1 B
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–L
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W–B
W–B
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J18JUNCTIONCONNECTOR
HP
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PR
ES
SUR
E SW
G
BR
26 A28 A23 A27 A29 A
A20ACCEL PEDAL POSITION SENSOR
2 1 3 5 4
EPA2 VCP2 VPA2 EPA VCPA
LG–R
G–R L
V–R
P–G
22 A
6
VPA
R–G
EPA2 VCP2 VPA2 EPA VCPA VPA
JUN
CTIO
NC
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NEC
TOR
BA
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,
B–W B–W
B–L
B–W
G
E, E 7
B–WJ 9JU
NC
TION
CO
NN
EC
TOR 1
2
32 B
THE
B
A13
A/C
THER
MIS
TOR
B–L
B–W
B–W
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
6 T
OY
OT
A T
UN
DR
A( C
ont.
nex
t pa
ge)
2
ACC
IG1
IG2
ST2
AM
14 6
7A
M2
22
22
2
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15A EFI NO. 150A J/B
100A ALT
30A AM2
1I4
1J7
1F11
3IE
1
12
53
22
22
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Fron
t lef
t fen
der
12
53
22
22
14IA
4
1K2
1B4
9A
8C
5IA
426
IA4
3B
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IFLe
ft ki
ckpa
nel
ED
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ke m
anifo
ld le
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15IE
1
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75
4
B
11
1
11
16
B
A
22
22
2
DD
D
B–Y
B–Y
W–LR
B–R
W W–L Y
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( *2)
B–R
W–B
B
W–R
W
B–R
W–G
B–O(*2)
B–R B–R
W–B W–B
L–OL–O
Y
W–L
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W–L
W–L
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BR
W
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W–B
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gin
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ITIO
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From ABS Actuatorwith ECU<16–3>
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11
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ruis
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1)
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. 2
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W–B
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* 2
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ise
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tion
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cato
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ht
IE1
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2
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1IA
5
W–G
A
W–GW–G
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J 8
JUN
CTI
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CO
NN
EC
TOR
D
15WFS
E
IL–
W
L–W
W–L
1F9
G
B–Y
B–Y
B–W
9C
Y
PY
(*3)
CRUISE
C11
C13
,
CO
MBI
NA
TIO
NM
ETER
AC
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
5 6 7 8
6 TOYOTA TUNDRA
H
D
C
B
7 D 10 E 12 E 13 E 19 D14 D
2
1
11 E 18 E
2 EF1
2
1
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15 E 25 E
IE126
24 E
IE119
16 A
14 A 2 A 1 A 22 A 6 D 5 D 4 D 3 D 1 D 8 D 21 E 14 E 27 D 29 E
4 BD1 2 BD1
1 BD1
14 IE1
1 EE1 3 EE1 2 EE1
1 1
23 E 22 E
23
43432
2
2
1
15
1 3
3 1 4
G–B
W–L
R
W
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B–W B–W B–W B–W B–W
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W–L
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W–L
W–L
B–W
B–W
G–Y
G–Y
BR
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–W
B–W
B–Y
G–B
G–B
G–B
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W–L
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W–L
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R–W
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BRB
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E ngine C on trol (5VZ –FE )
SIL W +B FC #10 #20 #30 #40 #50 #60 HTAF1 AF1+ OX2B HT2B KNK1 KNK2
BATT CCVEVP1PTNKVCVTATHWE2THAVGE2GTC
1
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TTE
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V 4
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AP)
4
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R(B
ank 1 Sensor 1 )
BR
BR
(Shielded )
(Shielded )
(Shielded )
(Shielded )
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K 1KN
OC
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NSO
R 1
H 9HEATED OXYGENSENSOR(Bank 1 Sensor 2)
, E 5E 4 B C , E 6 D , E 7 E ENGINE CONTROL MODULE
2
1
2
1
2
1
2
1
2
1
2
1I14IN
JEC
TOR
NO
. 1
I15IN
JEC
TOR
NO
. 2
I16IN
JEC
TOR
NO
. 3
I17IN
JEC
TOR
NO
. 4
I18IN
JEC
TOR
NO
. 5
I19IN
JEC
TOR
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. 6
B–R
B–R
B–R
B–R
B–R
B–R
B–R
B–R B–R B–R
B–O(*2)
A15
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B–O
(*2 )
EB–Y
A4
MREL
B–Y
26 E
AF1–
P
(Shielded )
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HT AF+
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F
W–G
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L
M
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OB–O(*1)
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2
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8 A
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+BM
4 C
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AC
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LS
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SO
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J14 J15,
JUNCTIONCONNECTOR
A B
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J 5JUNCTIONCONNECTOR
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JUN
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NC
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,
24 IE1
(Shielded )
25 IE1
R
13 A
WFSE
L–W
B
BR
BR
PY
G
AB–Y
CY
(Cont. next page)
DB–O
B–O(*1)
B–O
(*1 )
W–L
H A
E B
F B
G A
R
L–W
2
1 V 9VS
V(C
anister Closed Valve )
JUN
CTIO
NC
ON
NE
CTO
R
BA
J14J15
,
JUN
CTIO
NC
ON
NE
CTO
R
BA
J14J15
,
R
V 1VAPORPRESSURESENSOR
IE122
R–L
23 IE1
R–W
B–Y
B–Y
G–B
E 3 A ,
16 IE1
B
* 2 : w/o Cruise Control* 1 : w/ Cruise Control
BR
(*1)
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
910
11
12
6 T
OY
OT
A T
UN
DR
A (
Con
t’d)
7A
11D
10D
9D
2D
6A
12D
21D
13D
17D
4E
5E
EDIn
take
man
ifold
left
7E
18D 1
12
B
B–L
R–L
LG
B–Y
G–O
G
R
Y
L L
W–B
W–B
W–B
W–B
Y–R
En
gin
e C
on
tro
l ( 5
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–F
E)
E1
E01
E02
E03
PSW
G2
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SP
1IG
FIG
T3IG
T2IG
T1S
TA
(Shielded)
(Shielded)
From ” STA” Fuse<1–1>
To Combination Meter<29–3>
From Igniter<4–2><4–3>
P 2POWER STEERINGOIL PRESSURE SW
B2
L4
To Detection SW(TransferL4 Position)<19–3>
L–R
3A
9A
AC
TAC
1 L–Y
L–BTo IntegrationControl and Panel<30–3>
11B
To Detection SW(TransferNeutral Position)<19–4> TF
NR–Y
4WDTo ADD Detection SW
<19–3>GR
13B
8EE04
(4WD A/T)
BR
(4WD A/T)
(4WD)
12
C 2CRANKSHAFTPOSITION SENSOR
C 1CAMSHAFTPOSITION SENSOR
R
Y
BR
6E
ME
01 BR
B
, E
5E
4B
C,
E 6
D,
E 7
EE
NG
INE
CO
NTR
OL
MO
DU
LE
BR
8C
2C
9E
31E
17E
12
34
M–
M+
CL+
CL–
T 1
THR
OTT
LE C
ON
TRO
L M
OTO
R
GE
01M
–M
+C
L+C
L–
R
G
Y
L
BR
AB–
Y
CY
Cru
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Co
ntr
ol
( 5V
Z–
FE
)
EE 21
25B
17A
9B
22B
( A/T
)
See
Ele
ctro
nica
llyC
ontro
lled
Tran
smis
sion
and
A/T
Indi
cato
rS
yste
m<
15–4
>
C18
CR
UIS
E C
LUTC
H S
W
W–RB–YB–Y
J 8
JUN
CTI
ON
CO
NN
EC
TOR
(M/T) (M/T) D
PIS
T1–
CC
S
DB–
O
L–R B–O
Y
G
17IE
1
ED
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ke m
anifo
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ft
BR BR
3
5
C16
CR
UIS
E C
ON
TRO
L S
W[C
OM
B.
SW
]
B3
A20
(A/T)
STP
NSW
From Stop Light SW<13–4>
To Park/NeutralPosition SW<1–2>
G–W
P
A21
F/P
SFrom Center AirbagSensor Assembly<17–3>
R–B
, E
3A
G
(Shielded)
(Shielded)
CR
UIS
E
RE
S/A
CC
SET/
CO
AST
CA
NC
EL
EP
CC
S
See
Sto
p Li
ght
Sys
tem
<13
–4>
134
2
S 4STOP LIGHT SW
( *1)
(*1) (*1)
* 1
: w/ C
ruis
e C
ontro
l
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
7 TOYOTA TUNDRA
Head ligh t (w / Daytime Running L igh t)
1
2
5
3
2 2
2
2
ACC
IG1AM1 4
B–L (*1 ) B (*2 )
I23IGNITION SW
140A ALT (*1 )100A ALT (*2 )
BATTERY
2
1
1C6
1K5
2
2 2 2 2
2
2 2 22
A
A
B
B
EAFront left fender
2
1
5
3
2 2
2 2
TAIL
OFF
HIGH
LOW
HEAD
FLASH
LIGH
TC
ON
TRO
LS
WD
IMM
ER S
W
16
13 7
C15COMBINATIONSW
8
IIRight kickpanel
IF
W–B
W–G
G
W–G
W–G
W
R R–B
R–B
R–B
R–B
BR
R–G
VGR
W–B
R–WLR–L
G–W
B–Y
W–G
W–B
W–B
DRLNO. 4RELAY
J 3JUNCTIONCONNECTOR
J 2JUNCTIONCONNECTOR
J 2JUNCTIONCONNECTOR
11 1 1 1
9
3 3 2 24 5 2
A
B
40A AM
1
10A HE
AD LL
10A H
EA
D LH
10A HE
AD R
R
10A HE
AD R
H
1 2 1 2
33
A A
2
* 4 : w/o Wireless Door Lock Control* 3 : w/ Wireless Door Lock ControlP ower S ource
H 2
HE
ADLIG
HT R
H
H 1
HEA
DLIG
HT LH
2
H–LPRELAY
2
1
D 2DAYTIME RUNNINGLIGHT RESISTOR
RR
W–B
Y–B
W–G
R–B
R–B
R–B
R
5AECU–IG
W–G
W–G
W–G
G–B
Y–G
H EL T HF HL HU
2
1
6
W–B
See C
ombination
Meter S
ystem<
29–6>
2
1
50A J/B
DIM
MER
RELAY
2
1K2
15ATAIL
1K4
3 1J
4 1J
IHRightkickpanel
7 A
16 B
1J8
C
C
G–Y
(*4 )
W–B
R–W
F
F
J13JUNCTIONCONNECTOR
BR
A B
A A
IELeft kickpanel
Left kickpanel
G–Y
G–Y
3
J 7JU
NC
TION
CO
NN
ECTO
R
FG–Y
To TVIP
EC
U<
23–3>
R–W
R–W
JUN
CTIO
NC
ON
NEC
TOR
BA
J23J24
,
W–B
A
W–B
J 8JU
NC
TION
CO
NN
EC
TOR
B–Y
W–G
INTEGRATION RELAY
(2UZ–FE)
(5VZ–FE)
AJ18JUNCTIONCONNECTOR
A
A
HIG
H BE
AM
IND
ICA
TOR
LIGH
T[CO
MB
. ME
TER
]
BA
C11
C12
,
* 2 : Except Towing Package* 1 : Towing Package
From Fog Light S
W[C
omb. S
W]2–2>
From G
enerator<
1–4>
(*3)
1O3 15 1N 6 1O 3 1N 8 1N 7 1N 24 1N
(*3 )(*3 )
9 IA5
Y–B
8
13 1N 1 1N
2 1I
1N21O51O4
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
8 T
OY
OT
A T
UN
DR
A
2
B–L(*1) B (*2)
BATTERY140A ALT(*1)100A ALT(*2)
B–L(*1) B (*2)
21
35
22
1C6
1K5
1C7
H–L
PR
ELA
Y
TAIL
OFF
HIG
H
LOW
HE
AD
FLA
SH
EL
HT
HF
HL
LIGHTCONTROLSW
DIMMER SW
HU
C15
CO
MB
INA
TIO
NSW
138
1617
7
IFLe
ft ki
ck p
anel
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3JU
NC
TIO
NC
ON
NE
CTO
R
W–B
R R
R R
2
10A
HEA
D L
H10
AH
EA
D R
H
22
21
33
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12
AB
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R–B
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32
11
R–L
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J 2
JUN
CTI
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CO
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ECTO
R
R–Y
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1K4
1J3
1J4
R–G
AAA
J11
JUN
CTI
ON
CO
NN
EC
TOR
R–Y
R–Y
R–G
W–BR–G
R–G
R–Y
R–Y
1110
12
53
22
22
20A
FOG
1 2
2
G–R
R–Y
C15
FOG
LIG
HT
SW [CO
MB.
SW
]
G–R
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t lef
t fen
der
21
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–B
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W–B
W–B
W–B
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P
P
DD
J 2
JUN
CTI
ON
CO
NN
EC
TOR
P
F 1
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LH
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LIG
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RH
J18
JUN
CTI
ON
CO
NN
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TOR
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RE
LAY
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/o D
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ing
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acka
ge2 1
1L6
1L5
INTEGRATIONRELAY
F
To TVIP ECU<23–3>
FG
–Y
G–Y
G–Y
F
G–Y
J 7
JUN
CTI
ON
CO
NN
ECTO
R
G–Y(*4)
16B
7A
AB
AA IE
Left
kick
pane
l
W–B
C11
C12
,
HIG
H B
EAM
IND
ICAT
OR
LIG
HT
[CO
MB
. M
ETE
R]
AB
8IA
5
9IA
5
* 3
: w/ W
irele
ss D
oor L
ock
Con
trol
* 4
: w/o
Wire
less
Doo
r Loc
k C
ontro
l
J23
J24
,
JUN
CTI
ON
CO
NN
ECTO
R
AB
( *3)
( *3)
( *3)
(*3)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
9 TOYOTA TUNDRA
1K2 1J8
1E2 1H3
1G4
15A TA
IL
IFLeft kick panel
2
2
1
2
1
2
1
2
1
2 BB1
EA Front left fender
4
1
7 A
1 B 8 B 7 B
II
1
2
1
2
2
1
5 ID2 6 ID2
4 ID2 3 ID2
5 A
10 B
6 8 4
16
A
1
3 3
2 3
14
E E EE E E E
2
14
A
AA
2 2
1
E E E
A
EE
E E
E
E E
G–YG
W–B
G
W–B W–B W–B
G G G
GGGGG
GG
R–B
W–B
W–G
B–L (*1 ) B (*2 )
G G
W–B
W–B
W–B
W–B
W–B
W–B
W–B
GG
G
G
G
G G
G G
G
W–G
W–G
W–G
W–G
W–B
W–G
W–B
BR
W–G
W–B
W–G
P ower S ource Ta illight Illum ina tion
TAIL
OFF
HEAD
J 3JUNCTIONCONNECTOR
BATTE
RY
C15LIGHTCONTROL SW[COMB. SW]
F 3P
ARK
ING
LIGH
T LH[FR
ON
T TUR
N SIG
NA
L LIGH
T LH]
F 4P
AR
KIN
G LIG
HT R
H[FR
ON
T TUR
N S
IGN
AL LIG
HT R
H]
R 4
TAILLIGH
T LH[R
EA
R C
OM
B. LIG
HT LH
]
R 5
TAILLIG
HT R
H[R
EAR
CO
MB. LIG
HT R
H]
L 1LIC
EN
SE
PLATE LIGH
T LH
L 2LIC
EN
SE P
LATE
LIGH
T RH
1 2
(2UZ–FE)To Engine ControlModule<5–9>
15
J10JUNCTIONCONNECTOR
J12JUNCTIONCONNECTOR
J13JUNCTIONCONNECTOR
J 5JUNCTION CONNECTOR
R 3
RH
EO
STA
T
C12
ME
TER
ILLUM
INA
TION
[CO
MB
. ME
TER
]
C16
STE
ER
ING
SW
[CO
MB. SW
]
G 3
GLO
VE BO
X LIGH
T
A18
AS
HTR
AY ILLU
MIN
ATIO
N
C 8
CIG
AR
ETTE LIG
HTER
ILLUM
INA
TION
EL T H
A
AW–B
W–B
W–B
W–B
T
E L
GND ILL– IL–1
ILL+
J 1JUNCTIONCONNECTOR
D10DIODE(Idle–Up)
I24 I25,
INTEGRATIONCONTROLAND PANEL
A B
RAD
IO A
ND
PLAY
ER
AB
R 1
R 2
,
BL
W–B
* 4 : w/o Daytime Running Light* 3 : w/ Daytime Running Light
3 BB2
W–B
W–B
AA
A
J18JU
NC
TION
CO
NN
EC
TOR
2
2
1
140A A
LT (*1 )100A
ALT (*2 )
50A J/B
C A C A
A B A B
R–B
R–B
R–B
R–B
JUN
CTIO
N C
ON
NE
CTO
R
BA
J21J22
,
From TO
W TAIL
Relay<
31–3>
To TVIP EC
U<
23–4>
E
G
G
M 4
MIR
RO
R H
EATER
SW
3
1
GW
–G
E
17 IE1
IE15
BR
(2UZ–FE)
(5VZ–FE)
E
Surrounding of thefront of the fuel tank
Right kickpanel
G–W
G–W
To Option Connector<31–3>
AA
AB
W–B
W–B
J23 J24,
JUNCTIONCONNECTOR
A B
G(2U
Z–FE)
W–B
W–G
* 2 : Except Towing Package
W–B
BR
W–B
INTEGRATION RELAY
IELeft kickpanel
EDIntakemanifoldleft
ECRear bank ofleft cylinderhead
(5VZ–FE )
BR
(2UZ–FE
)
(*1 )
* 1 : Towing Package
4 1N
13 1L
(*3)
(*4)
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
10
TO
YO
TA
TU
ND
RA
Inte
rio
r L
igh
tP
ow
er
So
urc
e
22
2
B–L(*5) B (*6)
BA
TTE
RY
140A ALT(*5)100A ALT(*6)
10A
GAU
GE
2 1
40A AM1
2
AC
C
IG1
AM1
4
1I2
1F5
10A DOME
2 1
5B
G2
21
21
2
3
1
21
21
21
211
BK
Insi
de o
f rea
r doo
r R
HIF
Left
kick
pan
el
A
12
12
9A
9B
6B
5B
13B
7B
BJIn
side
of r
ear
door
LH
1J8
1A2
1B9
1H1
1B8
5BF
2
4B
H1
1F3
1E6
1F4
1A3
21
21
4IF
1
IF4
8
4IB
2
IB4
81IB
2
IB4
9
1IF
1
IF4
9
V 6VANITY LIGHT LH
V 7VANITY LIGHT RH
I26INTERIOR LIGHT
D19DOOR COURTESY SWREAR LH UPPER
D18DOOR COURTESY SWREAR LH LOWER
D16DOOR COURTESY SWFRONT LH
D21DOOR COURTESY SWREAR RH UPPER
D20DOOR COURTESY SWREAR RH LOWER
D17DOOR COURTESY SWFRONT RH
21
B–Y
L–Y
L–Y
L–Y
L
W–L
B
W
L–Y
L–B
R
B–W B–W
B–W
W–B
W–B
W–L
W–L
W–L
W–L
B
W–L
W–LL–Y
L–Y
L–Y
L–Y
L–Y
W–B
W–B
B–W
L
L
L
W–B W–B
B–W
W–L
B–W
B–W B–W B–W B–W
B–W
W–B
W–B
B–W B–W
L
B–W
L–Y
L–Y
L–Y
L–Y
L–Y
L–Y
B–W
( *2)
I22
IGN
ITIO
N K
EYC
YLI
ND
ER L
IGH
T
J 3
JUN
CTI
ON
CO
NN
EC
TOR
P 8
PER
SO
NA
LLI
GH
T
CC
CC
C
C
C
EE
EE
E
CC
D15DOOR COURTESYLIGHT RH
I23
IGN
ITIO
N S
W
J 9
JUN
CTI
ON
CO
NN
EC
TOR
J 5
JUN
CTI
ON
CO
NN
ECTO
RJ
4JU
NC
TIO
NC
ON
NE
CTO
R
COMBINATIONMETER
BAC11 C12,
B–Y L
From IntegrationRelay<20–2><21–2>
(*2) (*2) (*2)
(*2) (*2)
(*1)(*1)
( *3)
( *4)
( *3)
( *4)
B–W
(*1)
(*2) (*2) (*2) (*2) (*2)
(*2)(*2)
(*1)
B–L(*3)
(*3)
From IntegrationRelay<20–2><21–2>
* 6
: Exc
ept T
owin
g P
acka
ge*
5 : T
owin
g Pa
ckag
e*
4 : w
/o W
irele
ss D
oor L
ock
Con
trol
DOOR
2 1
W–L
1
2 DOOR
OFFON
W–B
W–B
1
DO
OR
12
2
12
2
SHORT PIN
CB
BA
BA
BA
L
B–W(*4)
D11DIODE(Power Window System)
4BE
2
C
B–W
5B
E2
4B
G2
E
L(*2)
L
J23
J24
,
JUN
CTI
ON
CO
NN
ECTO
R
AB
2IC
1
21
BA
BA
BB
From
TVI
PE
CU
<23
–3>
BB
B–W
BB
B
B–W
B–W
W–B
To T
VIP
ECU
<23
–4>
B–W
B ( *3)
( *3)
(*3)
21
D29
DIO
DE
( TVI
P)
L–Y
* 2
: Acc
ess
Cab
* 3
: w/ W
irele
ss D
oor L
ock
Con
trol
* 1
: Sta
ndar
d C
ab
From
TVIP
EC
U<
23–3
>
L
E
B–W
JUNCTION CONNECTOR
BAJ21 J22,
D14DOOR COURTESYLIGHT LH
(*3)B–W
S 3STEP LIGHT
L–Y
(*2)
D27DIODE(Step Light)
D 9DIODE(Door Courtesy)
(*4)
B–W
(*2)
( *2)
J 4
JUN
CTI
ON
CO
NN
ECTO
R
(*2) (*2)
( *3)
(*3)
(*3)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
11 TOYOTA TUNDRA
2
2
2
ACC
IG1AM1 4
1I2
1J5
2
2
1
1
2
3
3
1
3
1
2
3
C A
A B B B
LH
RH
2
31
I23IGNITION SW
1H12 1H131E11 1E7 1D5 1D11
1D7 1D10
1 B 12 C
EA Front leftfender
IF II Right kickpanel
A A
7 A
8 3 2 7
1
1 4 6 5
C15TURN SIGNAL SW[COMB. SW]
J13JUNCTIONCONNECTOR
J 3JUNCTIONCONNECTOR
W–B
W–B
B–Y
WL–W
G–Y
G–B
G–R
G–B
G–Y
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B
BATTERY
2
140A ALT (*1 )100A ALT (*2 )
40A AM
1
R–B
L–W
2
20A H
AZ
From Integration C
ontroland P
anel<30–7>
TUR
N S
IGN
AL IN
DIC
ATO
RLIG
HT[C
OM
B. METER
]
BA
C11
C12
,
LH RH
T urn S ignal and H azard W arning L igh tP ow er S ource
B A
F 4FR
ON
T TUR
N S
IGN
AL
LIGH
T RH
R 5
REA
R TU
RN
SIGN
AL
LIGH
T RH
[REA
RC
OM
B. LIGH
T RH
]
R 4
REA
R TU
RN
SIGN
AL
LIGH
T LH[R
EAR
CO
MB. LIG
HT LH
]
F 3FR
ON
T TUR
N S
IGN
AL
LIGH
T LH
5ATURN
T 5TURN SIGNALFLASHER
G G–B
G–B
G
G–Y
G–B
G–B
G–Y
G–B
G–Y
L–W
W–B
W–B
TL TR TB
TURN
IG +B ER EL
EHW LL LR GND
B–L (*1 )
B (*2 )
BL Surrounding of thefront of the fuel tank
W–B
W–B
22 IA4
* 2 : Except Towing Package* 1 : Towing Package
A
AA
J18JU
NC
TION
CO
NN
ECTO
R
BB23
1D9 1D6
To Towing C
onverter<
31–4>
AA
AA
AB
Left kickpanel
IELeft kickpanel
W–B
W–B
W–B
G–Y
G–B
J23 J24,
JUNCTIONCONNECTOR
A B
J14 J15,
JUNCTIONCONNECTOR
A B
CC
13,
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
12
TO
YO
TA
TU
ND
RA
2
AC
C
IG1
AM
1
3 4
22
12
53
22
2
40A AM1
20A FOG
140A ALT(*6)100A ALT(*7)
54
2
3
10A
HE
AD
LL
12
53
22
22
22
22
22
8IA
5
1011
EA
Fron
t lef
t fen
der
21
21
1I2
10A
GA
UG
E
1F7
1F8
1F9
1G11
15A
AC
C
1I1
21
35
IELe
ft ki
ckpa
nel
2A
1B
2B
3A
( A/T
)
( M/T
)
( A/T
)
( M/T
)
33
AD
1
1
11
A E
55
D A
3 12
A E
ADG
R–B
G–W
B–Y
L–R
( *5)
B–Y
GR
( *4)
B–Y
GR
( *4)
GR
( *3)
B–Y
R–B
R–B
W–B
W–B
W–B
R–B
( *2)
R–B
R–B(*2)
R–B(M/T)
R–B
R–B
W–B
W–B
W–B
W–B
B–Y
B–Y
B–Y
L–R
L–R
L–R
W
P
R–Y
P
P
W–B
W–B
W–B
G–B
R–B
R–B
( M/T
)
B–L(*6) B (*7)
B–Y
Po
we
r S
ou
rce
Fo
g L
igh
t ( w
/ D
ay
tim
e R
un
nin
g L
igh
t)B
ac
k–
Up
Lig
ht
3
22 2
H–LP RELAY
DIMMER RELAY
FOG RELAY
R–Y
See HeadlightSystem<7–3>
See Headlight System<7–1>
J 2JUNCTIONCONNECTOR
BAT
TER
Y
C15
FOG
LIG
HT
SW
[CO
MB
. S
W]
J18JUNCTIONCONNECTOR
F 1FRONT FOG LIGHT LH
F 2FRONT FOG LIGHT RH
(M/T)
(A/T)
(A/T)
( A/T
)(M/T)
( A/T
)
( A/T
)( A
/T)
( M/T
)
J 8
JUN
CTI
ON
CO
NN
EC
TOR
D 8
DIO
DE(
A/T)
B 3
BAC
K–U
PLI
GH
TR
ELA
Y
BACK–UP LIGHT SW[PARK/NEUTRAL POSITION SW]
AP 1
R 5BACK–UP LIGHT RH[REAR COMB. LIGHT RH]
R 4BACK–UP LIGHT LH[REAR COMB. LIGHT LH]
J12
JUN
CTI
ON
CO
NN
ECTO
RC
C
* 5
: 5V
Z–FE
* 6
: Tow
ing
Pack
age
I23
IGN
ITIO
N S
W
To IntegrationRelay<7–3>
(A/T)
BACK–UP LIGHT SW
BB 1
2IE
1
IE1
4
26IE
1
L–B(*2)
L–B(*1)
( *2)
( M/T
)
L–B(*1)
L–B
( *2)
B–Y
( M/T
)
12IE
1
IE2
152
IE1
R–B(*1)
R–B(*1)
( *2)
( M/T
)
GR
( *3)
J 9
JUN
CTI
ON
CO
NN
EC
TOR
BL
Sur
roun
ding
of t
hefro
nt o
f the
fuel
tank
(*5)*
7 : E
xcep
t Tow
ing
Pac
kage
1
2
5A ECU–B
2
2
R–B
17IA
5
F BD A
12
43
J21
J22
,
JUN
CTI
ON
CO
NN
EC
TOR
AB
(*5)
L–O
L–R
W–R(*3)
W–R(*4)
See
Eng
ine
Con
trol
Sys
tem
<5–
2>
A22
AC
C C
UT
RE
LAY
7B
B1
To T
raile
rSo
cket
<31
–3>
R–B
Y
IA49
L–R
( *1)
L–R
( *1)
W–RW–R(*3)
W–R(*4)
2 1
SHORT PIN
( *1)
( *1)
BB2
3
AB
AA
JUNCTIONCONNECTOR
BAJ23 J24,
W–B
W–B
* 1
: 2U
Z–FE
* 3
: w/ D
oor
Lock
Con
trol
* 2
: 5VZ
–FE
A/T
* 4
: w/o
Doo
r Loc
k C
ontro
l
22
B
W–R
( *3)
1
IA48
L–O
( *6)
( *1)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
13 TOYOTA TUNDRA
2
2
B–L (*1 ) B
(*2 )
BATTERY
P ow er S ource M irro r H ea ter S top L igh t
50AJ/B
W–G
1
G–W
G–Y
BA
JUNCTIONCONNECTOR
, J15J14
W–B
W–B
W–B
G–W
G–W
G–W
G–W
G–Y
G–Y
W–B
To Engine Control
Module<
5–14><
6–9>
C
C
J 3JUNCTIONCONNECTOR
BC
AA
BC
4 1D
5 1H
1 1D
3 1D
2 1A
8 1J
IF
G–W
To ABS
Actuator with
EC
U<
16–4>
2 1K
2 1F
C J10JUNCTIONCONNECTOR
33
44
G–W
W–B
H10
HIG
H M
OU
NTE
DS
TOP
LIGH
TG–W R
4STO
P LIG
HT LH
[RE
AR
CO
MB
. LIGH
T LH]
R 5
STO
P LIG
HT R
H[R
EAR
CO
MB. LIG
HT R
H]
1
2
IC1
15ASTOP
2
3 1
S 4STOP LIGHTSW
BLSurroundingof the frontof the fuel tank
4
See Cruise ControlSystem<5–15><6–11>
See Cruise ControlSystem<5–15><6–11>
1
2
140A ALT(*1)100A ALT(*2)
G–W
Left kickpanel
A
To Option C
onnector<
31–3>
To Towing C
onverter<
31–4>
G–W
G–W
C
C
2
15AMIR HTR
40AAM1
2
2
11
2
2
ACC
IG1AM1 4
9 1F
2 1I
10AGAUGE
W
R–W
B–Y
I23IGNITION SW
E
EE
IE Left kickpanel
A B A B
A A
4
2
B–YB
–Y
J 8JUNCTIONCONNECTOR
IG
E D
6
M 4MIRROR HEATERSW
W–B
W–B
16 IA5
1
2
5
3
2 2
2 2
6 IF3
6
2
1 IF3
IIRight kickpanel
R 9
MIR
RO
R H
EATER
RH
[RE
MO
TE C
ON
TRO
L MIR
RO
R R
H]
6 IB3
2
6
IB31
R 8
MIR
RO
R H
EATE
R LH
[RE
MO
TE CO
NTR
OL M
IRR
OR
LH]
25 IA4
11 IA4
D
D D
MIR HTRRELAY
B–Y
R–W
R–W
R–W
R–W
W R–W
R–W
R–W
R–W
B–Y
B–Y
J11JUNCTIONCONNECTOR
J13JUNCTIONCONNECTOR
J23 J24,
JUNCTIONCONNECTOR
A B
W–B
W–B
W–B
W–B
P–G
W–B
A
* 1 : Towing Package* 2 : Except Towing Package
(*1 )
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
14
TO
YO
TA
TU
ND
RA
( Con
t. n
ext
page
)
2
AC
C
IG1
IG2
ST2
AM
1
3 4 67
AM
2
22
2 2
40A AM1140A ALT(*1)100A ALT(*2)
30A AM2
15A EFI NO. 1
1I4
1F11
2
12
53
2 EA
Fron
t lef
t fen
der
3A
32D
28E
8B
9B
10B
11B
17B
20A
22A
21E
19E
17E
16E
19B
12
6IA
4
2 2
1A
14IA
4
16A 13
7E
6E
7C
4C
EB
Rea
r ban
k of
rig
htcy
linde
r hea
d
26D
34D
15D
10D
11D
B C D E F G I J
B
11
1
1
21
B
22
2
2
48
7
L–O
W–BLGL
W–R
R–B
B–Y
L–R
B–R
B–YL–R
B–L(*1) B (*2)
W–R
W
B–R
B–Y W–B
W–L
W–L W–LW–L
B–R
B–R
B–R
R–L
B–W
R–B
W–R
L
LGR W–B
W–B
W–B
W–B
W–B
Y–R
W–R
W–R
W–L
P–L
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Ele
ctr
on
ica
lly C
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lled
Tra
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sio
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In
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r ( 2
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Po
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I23
IGN
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OD
MS
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E02
E03
ME
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SL
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WVT
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See
Eng
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Con
trol S
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m<
5–7>
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10>
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11>
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12>
<5–
13>
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14>
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15>
BAT
TER
Y
W
B
YNO. 3
NO. 2
NO. 1
EFI
REL
AY
J 1
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ON
CO
NN
EC
TOR
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O 4O/D MAIN SW
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L–O
E 1ELECTRONICALLY CONTROLLEDTRANSMISSION SOLENOID
15IA
4
B–O B–O
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J 5JUNCTIONCONNECTOR
5A IGN
Y–R
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B25
OIL
W
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3A
EC
Rea
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k of
left
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ead
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1
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22
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AA
W–B
J18JUNCTIONCONNECTOR
* 1
: Tow
ing
Pack
age
* 2
: Exc
ept T
owin
g P
acka
ge
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
5 6 7 8
14 TOYOTA TUNDRA (Cont’ d)
J
I
H
F
E
D
C
B
E lectron ically Con trolled Transmiss ion and A /T Ind icato r (2U Z–F E)
7 A10 D
9 A 9 D 8 D 7 D 6 D 5 D 4 D
8 4 7 5 2 1
3
LL 2L DL NL RL PL
11 IE1 20 IE1 6 IE1 10 IE1 2 IE1 19 IE1
1I2 1I1
10AGAUGE
15AACC
1G111F91F5
26 IE1
2
A B
B C
E A
AE
C CB
BABA
L–R
B–Y
R–B
L
Y–R
L–O
W–B
L–B
B–Y
B–Y
L–B
W–B
B–Y
LG L LG L
LG L
W–R
W–R
R–B
R–B
R–B
L–Y
B–Y
B–Y
GR
GR
GR
L–Y
R–B
LG–B
W–R
LLG
C11 C14,
COMBINATION METER
A D
J12JUNCTIONCONNECTOR
A/T O
IL TEM
P.
L 2 D N R P
J12JUNCTIONCONNECTOR
L–B
P 1A/T INDICATOR SW[PARK/NEUTRAL POSITION SW]
(*4 )
(*3 )(*3 )
1 3
J 8JUNCTIONCONNECTOR
J 8JU
NC
TION
CO
NN
EC
TOR
LG–B
LG–B
C
C
J11JU
NC
TION
CO
NN
EC
TOR
B
W–R
W–R
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O/D
OFF
GLG
RB
D 8DIODE(A/T)
J 9JUNCTIONCONNECTOR 1
2
4
3
W–R
See Engine C
ontrolSystem
<5–2>
A22ACC CUT RELAY
* 4 : w/o Door Lock Control* 3 : w/ Door Lock Control
AA
AB
IE Left kickpanel
W–B W–B
AW–R
8 IA4 9 IA4 17 IA5
D A
F B
W–R
W–R(*3)
(*3)
W–R
L–O
L–RL–R
L–O
L–O
(*4 )
JUN
CTIO
NC
ON
NE
CTO
R
BA
J21J22
,
J23 J24,
JUNCTIONCONNECTOR
A B
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
15
TO
YO
TA
TU
ND
RA
( Con
t. n
ext
page
)
2
AC
C
IG1
IG2
ST2
AM
1
3 4 67
AM
2
22
2 2
40A AM1 100A ALT
30A AM2
15A EFI NO. 1
1I4
5A IGN
1F11
2
12
53
2 EAFr
ont l
eft f
ende
r
16A
19E
11E
21B
4B
5B
6B
6A
7D
25E
15E
18E
7A
3B
20A
21
6IA
4
2 2
1A
14IA
4
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8E
7E
5E
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take
man
ifold
left
23D
22D
1E
2E
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A B D E F G H I
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11
1
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21
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22
2
2
48
7
L–O
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R–B
B–Y
L–R
B–R
B–YL–R
B
W–R
W
B–R
B–Y W–B
W–L
W–L W–LW–L
B–R
B–R
B–R
R–Y
B–WR–Y
R–B
L
LG
Y–R
R W–B
W–B
BR
W–B
W–B
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W–R
W–R
W–L
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G–R
Ele
ctr
on
ica
lly C
on
tro
lled
Tra
ns
mis
sio
n a
nd
A/T
In
dic
ato
r ( 5
VZ
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E)
Po
we
r S
ou
rce
I23
IGN
ITIO
N S
W
A 4A/T OIL TEMP. SENSOR
OD
MS
E04
E03
E02
E1S
P2+
SP2–
SL
S2
S1+BBAT
TO
ILE
2S
TPN
SW
STA
THW
VTA
VC
TCS
P1R
2L
OIL
W
See
Eng
ine
Con
trol S
yste
m<
6–5>
<6–
7><
6–9>
<6–
10>
BAT
TER
Y
W
B
YSL
NO. 2
NO. 1EF
IR
ELA
Y
J 1
JUN
CTI
ON
CO
NN
ECTO
R
V 3VEHICLE SPEED SENSOR(Electronically Controlled Transmission)
O 4O/D MAIN SW
, E
5E
4B
C,
E 6
D,
E 7
EEN
GIN
E C
ON
TRO
L M
OD
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E 1ELECTRONICALLY CONTROLLEDTRANSMISSION SOLENOID
4A
B–Y
MR
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IGSW
B–O
A15
L–O
W–B
4EE01
15IA
4
OD
LP
20B
AAJ1
8JU
NC
TIO
NC
ON
NE
CTO
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W–B
G–W
62
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5C
B–R
SLT–
SLT+
BR
6D
ME0
1
W–R
25B
CW
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D
B B
J 5JUNCTIONCONNECTOR
B–OB–O(*1) (*1)
(*2)
* 1
: w/ C
ruis
e C
ontro
l*
2 : w
/o C
ruis
e C
ontro
l
, E
3A
OSLT
+S
LT–
G
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
5 6 7 8
15 TOYOTA TUNDRA (Cont’ d)
I
H
G
F
E
D
B
A
E lectron ically Controlled Transmiss ion and A /T Indicato r (5V Z–F E )
7 A10 D
9 A 9 D 8 D 7 D 6 D 5 D 4 D
8 4 7 5 2 1
3
LL 2L DL NL RL PL
23 IE2 6 IE2 26 IE2 2 IE2 15 IE2 21 IE2
1I2 1I1
10AGAUGE
15AACC
1G111F91F5
4 IE1
2A B
B C
E A
AE
C CBBABA
L–R
B–Y
R–B
L
LG
Y–R
L–O
W–B
L–B
B–Y
L–R
B–Y
L–B
W–B
Y–R
B–Y
LG L LG L
LG L
W–R
W–R
LG–B
R–B
R–B
R–B
L–Y
B–Y
B–Y
GR
GR
GR
L–Y
R–B
LG–B
W–R
LLG
C11 C14,
COMBINATION METER
A D
J12JUNCTIONCONNECTOR
O/D
OFF
A/T OIL TEM
P.
L 2 D N R P
J12JUNCTIONCONNECTOR
L–B
P 1A/T INDICATOR SW[PARK/NEUTRAL POSITION SW]
(*4 )
(*3 )(*3 )
1 3
J 8JUNCTIONCONNECTOR
J 8JU
NC
TION
CO
NN
EC
TOR
D3
RB
D 8DIODE(A/T)
J 9JUNCTIONCONNECTOR
CW–R
B
W–R
IE Left kickpanel
A A
A B
W–B W–B
W–B
W–B
J23 J24,
JUNCTIONCONNECTOR
A B
* 4 : w/o Door Lock Control* 3 : w/ Door Lock Control
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
16
TO
YO
TA
TU
ND
RA
21
21
1E
A14
EA1
2E
A15
EA1
W
W
I23
IGN
ITIO
N S
W
6E
A13
EA
1
22
2
2
40A AM1140A ALT(*1)100A ALT(*2)
40A ABS2
30A ABS3
B–L(*1) B (*2)
11
1
1 22
2
2
BATTERY
117
P P
V V
LG
L
R
W
B
Y
B
Y
W
R
L
LG
98
2322
54
1920
A 6
AB
S S
PEE
D S
EN
SO
RFR
ON
T LH
A 7
AB
S S
PEE
D S
EN
SO
RFR
ON
T R
H
LHR
H
1F5
1K3 7
EA1
116
Data Link Connector 3<5–4><6–4>
153
YY
W–G
II
AA
From Stop Light SW<13–4>
A 5
AB
S A
CTU
ATO
R W
ITH
EC
U
W
W–B
W–BG–W
218
FL+
FL–
FR+
FR–
RL+
RL–
RR
+R
R–
GN
D1
GN
D2
D/G
TCIG
1W
A+B
M+B
S
B–R B–Y
B–Y B–L
B–Y
B–R
J13
JUN
CTI
ON
CO
NN
EC
TOR
Po
we
r S
ou
rce
AB
S
1I2
B–R
B–Y
* 1
: Tow
ing
Pack
age
* 2
: Exc
ept T
owin
g P
acka
ge
2
AC
C
IG1
AM1
4
B–Y
34
12
11B
B1
10B
B1
9BB
18
BB1
10A
GA
UG
E5A EC
U IG
To Detection SW(Transfer L4 Position)<18–4><19–3> 14
L–RE
XI A19
AB
S S
PEE
D S
EN
SO
R R
EAR
Rig
ht k
ick
pane
l
7
W–L
TS
24 STP
ABS WARNING LIGHT[COMB. METER]
CAC11 C13,
9A
7C
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
17 TOYOTA TUNDRA
67
2
2
1M3
1I4
5AIGN
I23IGNITION SW
BATTER
Y
W–R
P ower S ource S RS
1E6
1F3
A
A
3 B23 B5 B13 B14 B
3 A2 A
4 A 1 A2 B1 B
10 B11 B
1 2 1 2
12 B 19 B
A11AIRBAG SENSORFRONT LH
A B
CONNECTIONDETECTION PIN
A12AIRBAG SENSORFRONT RH
A B
CONNECTIONDETECTION PIN
9 B 20 B15 B 26 B6 C5 C1 A2 A28 B
IH Right kick panelIELeft kick panel
27 B
ACC
IG1
IG2
ST2
AM1
AM2
2
B–L (*1 )
B (*2 )
1
1
2
2
L–Y
B–R
L–Y
B–O
R–B
B–YB
–Y
B–Y
Y–R
Y–G
W–B
R Y–G
Y–R
1 2
A16AIRBAG SQUIB(Front Passenger Airbag Assembly)
A17AIRBAG SQUIB(Steering Wheel Pad)
P 3 P 4,
PASSENGER AIRBAGMANUAL ON–OFF SW
A B
SQB+ SQB–
E IND ECU– ECU+
SPIRALCABLE
Y–B Y
C 4 C 5,
CENTER AIRBAG SENSOR ASSEMBLY
A B C 6, C
W–B
W–B
W–B
Y–B Y Y–B Y
P13PRETENSIONERLH
P14PRETENSIONERRH
1 IA1 2 IA1
W–R
W–R
BRBR
B–W
BR
–W
W
W–G
P– P+ D+ D–
E1 E2 PL+ PL– PR+ PR– SL+ SL– SR+ SR–
IG2 GSW2 LA
SIL TC
B–R
L–Y
J 5JUNCTIONCONNECTOR
A
1 2
2 1 2 1
10ADOME
30AAM2
From Integration C
ontroland P
anel<30–7>
To Integration Control
and Panel<
30–6>
A11
B
LBE+RBE+
8 C
To Buckle S
W LH
<26–4>
To Data Link C
onnector 3<
5–4><
6–4>
B–Y
B–L
From S
eat Belt Warning
Occupant D
etectionS
ensor and Buckle S
W R
H<
30–5>
1
2
SHORTPIN
2
2
B
To Engine C
ontrol Module
<5–14>
<6–9>
5 B
10 C
C12 C13,
SRS WARNING LIGHT[COMB. METER]
B C
W–R
* 2 : Except Towing Package* 1 : Towing Package
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
18
TO
YO
TA
TU
ND
RA
2
ACC
IG1
AM
1
3 4
2
40A
AM1
140A
ALT
( *3)
100A
ALT
( *4)
2
1I1
1I2
15A
ACC
10A
GA
UG
E20
A4W
D
1G11
1F9
1F5 10
B11
B8
A1
D
9A
26IE
1
53
II
12
24IE
23
IE2
12
D 4DETECTION SW(Transfer L4 Position)
D 3DETECTION SW(Transfer 4WD Position)
IE22
DD
D
2AE
11
618
255
214
720
C
22
31E
A
123
D
CLG
–BLG
–B
W–B
W–B
W–B
W–B
W–B
W–B
G–RG–R
L–R
L–R
G–O
L–R
L–R L–R
W–B
LG–B
Y–B
P
G–Y
BR–YB–Y
B–Y
B–Y B–Y
GRGR
GR
L–B L–B
LG–B
Y–B
Y–B
BR–Y
B–L(*3) B (*4)W
B–Y
4W
D (
2U
Z–
FE
)P
ow
er
So
urc
e
(*2)
(*1)(*1)
I23
IGN
ITIO
N S
W
J 8JUNCTIONCONNECTOR
D 8
DIO
DE
( A/T
)
P 1
NE
UTR
AL
PO
SIT
ION
SW
[PA
RK/
NE
UTR
AL
PO
SIT
ION
SW
]
BAT
TER
Y
C11
C12
,
CO
MB
INA
TIO
N M
ETE
R
AB
J12
JUN
CTI
ON
CO
NN
ECTO
R
J13
JUN
CTI
ON
CO
NN
EC
TOR
J11
JUN
CTI
ON
CO
NN
ECTO
R
From Engine ControlModule<5–10>
From ABS Actuatorwith ECU<16–3>
To Combination Meter<29–3>
* 1
: w/ D
oor
Lock
Con
trol
* 2
: w/o
Doo
r Loc
k C
ontro
l
From
Inte
grat
ion
Con
trol a
nd P
anel
<30
–6>
To IntegrationControl and Panel<30–6>
BR–Y
4HI
4LO
W–B
IGS
PD
IND
2IN
D1
NG
ND
H–L
2–4
L44W
D
W–B
W–B
J 9JUNCTIONCONNECTOR
12
SH
OR
TP
IN
2
B
2
5A EC
U–B
2 1
2
17IA
5 W–R
FB
DA
W–R
JUNCTIONCONNECTOR
BAJ21 J22,
(*1)
11J
IE1
10
12
43
IA49
L–R
B–Y
L–R
B–Y
W–R(*2)
W–R
(*1)
W–R(*2)
W–R(*1)
See
Eng
ine
Con
trol
Sys
tem
<5–
2>
A22
ACC
CU
TR
ELA
Y
Rig
ht k
ick
pane
l
D,
C14
A B
F 7
4WD
CO
NTR
OL
ECU
* 3
: Tow
ing
Pac
kage
* 4
: Exc
ept T
owin
g Pa
ckag
e( Con
t. n
ext
page
)
8IA
4L–O L–O
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
5 6 7 8
18 TOYOTA TUNDRA (Cont’ d)
36 2 5 1
GR
GR
GR
GR
LGB–R
R–B
4
RR–B
10 1123 R–W
24
LG
19
8 IE216 IE29 IE217 IE2
14 IE1
5 EC13 EC14 EC12 EC1 1 EC1
5 ED13 ED1
IE226
ED12 1 ED1
EC16
RRR–B
B–RLG
LG
R–W
R–B
R
4W D (2U Z–F E)
G
IE212
G
YY
R–W
R–W
ED14
IE213
B–W
B–W
IE220
LW
IE221
13 26 8 9 22
M
6 ED1
W–B
W–B
4
1 2 3 5 6
A 9ADD ACTUATOR
T 3TRANSFER SHIFT ACTUATOR
TM1 TM2 TL1 TL3 TL2 ADD
DL1 DL2 DM1 DM2
F 74WD CONTROL ECU
W–B
M
H2
H4
L4
A
B
W–B
W–B
GR
GR
From E
ngine Control M
odule<
5–15>
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
19
TO
YO
TA
TU
ND
RA
2
ACC
IG1
AM
1
3 4
2
40A
AM
1
100A
ALT
21
IE3
IE2
8
9IE
3
IE2
20
2IE
3
IE2
9
18IE
1
IE1
18
IIR
ight
kic
k pa
nel
5E
G1
4E
G1
3E
G1
2E
G1
M
5IE
3
IE2
1
12
6IE
1
( A/T
)
( M/T
)
( A/T
)
( M/T
) 1E
G1
21
21
13IE
2
24IE
2
IE17
2D
9A
4D
10B
1J1
1I1
1I2
20A 4WD
10A GAUGE
15A ACC
1G11
1F9
1F5
4IE
1
13
21IE
2
2EA
BB
D
D
CC
1 1
24
101
5
4
79
3
36
52
1
A
2 2
CC
D
DD
EA
B1
3
D
W–B
W–B
W–B
W–B
WB–Y
L–R
W
L–R
W–B
W–B
W B
R
R–W
R–B
LG LG
R–B
R–W
R R
R–W
R–B
LG
GR
W–B W–B
W–B
GR
GR
GR
GR
L–R
GR
L–R
L–R
R–Y R–Y R–Y W–B
L–YR–Y
B–Y GR
L–YL–BL–BB–YB–Y
GR GR
GR
B–Y
L–R
L–Y
L–R
L–R L–R L–R
W
W W
B–R B–R
W
W
4W
D (
5V
Z–
FE
)P
ow
er
So
urc
e
(M/T)
I23
IGN
ITIO
N S
W
D 3
DET
ECTI
ON
SW
( Tra
nsfe
r 4W
D P
ositi
on)
J11
JUN
CTI
ON
CO
NN
EC
TOR
T 4TRANSMISSION CONTROL RELAY
J13
JUN
CTI
ON
CO
NN
EC
TOR
BAT
TER
Y
A 9
ADD
AC
TUAT
OR
J10
JUN
CTI
ON
CO
NN
EC
TOR
(A/T)
(A/T)
(M/T)
(A/T)
( M/T
)
(M/T)
(A/T) (A/T)
(A/T)
(A/T) (A/T) (A/T)
( A/T
)
J12JUNCTIONCONNECTOR
D 4
DET
ECTI
ON
SW
( Tra
nsfe
r L4
Pos
ition
)
D 5
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From Engine ControlModule<6–10>
From ABS Actuatorwith ECU<16–3>
From Engine ControlModule<6–10>
From Engine ControlModule<6–10>
(*2)
(*1) (*1)
J 8JUNCTION CONNECTOR
D 8
DIO
DE
( A/T
)
P 1
NE
UTR
ALPO
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[PAR
K/N
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TRAL
PO
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]
A/T P
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* 1
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3
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3
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2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
3 421
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7–4>
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<23–3> J 8
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LOC
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LOC
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3
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2
6 IF4
4
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24
II Right kick panel
J13JUNCTIONCONNECTOR
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1
1
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C
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1
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1H9 1J88 1H
1
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R–L
A
3
4 IB3
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W–G
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W–B
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W–B
W–B
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W–B
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13 12 8
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2420 1N19
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9 IF3 8 IF36 IB4
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INTEGRATION RELAY
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B
From TVIP E
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J 7JUNCTIONCONNECTOR
J 7JUNCTIONCONNECTOR
W–G
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D
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L–R
L–R
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J 7JUNCTIONCONNECTOR
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B–Y
From TV
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J21 J22,
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A B
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EA
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J22J21 ,
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1N91N
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
21
TO
YO
TA
TU
ND
RA
2
AC
C
IG1
AM1
4
22
2
40A AM1 140A ALT(*1)100A ALT(*2)
1I2
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31
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G–B
11
13
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2 2
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42
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D
A
69
1 2
D
A
B–Y
W–G
W–G
W–B
W–B
W–B
L–W
W
W–G
B–L(*1) B (*2)
L–R
W–G
L–R
G–B
R–Y
R–Y
R–Y
W–G
R–L
L–W
L–Y
L–W
L–Y
R–L
L–W
BR
W–B
B–Y
B–Y
W–B
B–Y
W–B
W–B
W–B
W–B
W–B
W–B
BR
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L–Y
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P10DOOR LOCKCONTROL SW LH[POWER WINDOW MASTER SW]
To DoorCourtesySW Front LH<10–1>
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J 4
JUN
CTI
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D23DOOR KEY LOCK ANDUNLOCK SW RH
D25DOOR LOCK MOTOR ANDDOOR UNLOCK DETECTIONSW LH
D26DOOR LOCK MOTOR ANDDOOR UNLOCK DETECTIONSW RH
See TaillightSystem<9–1>
See HeadlightSystem<8–1>
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INTE
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J 3
JUN
CTI
ON
CO
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From TVIP ECU<23–4>R–W
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D B
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41L
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P–B
W–B
IER
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kic
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A AA B
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J23
J24
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JUN
CTI
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CO
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VIP
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23–4
>
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J22
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CO
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J22
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JUN
CTI
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From TVIP ECU<23–3>
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JUN
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L–W
* 1
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ing
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2003 TOY
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TU
ND
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(EW
D491U
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ACC
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22
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2
1
3
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1H7 1H6 1J8
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3 IF4
IE Left kickpanel
1 IB3
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2 IB4 1 IB4
2 IF4 1 IF4
M1 2
108431
3 1
14 15 8
2
11
1
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2
2
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R–B
R–W
R–B
R–W
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LG
L–Y
L–R
L–R
L–R
L–R
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INTEGRATION RELAY
I23IGNITION SW
PO
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See D
oor LockC
ontrol System
<20–2>
<21–2>
P10POWER WINDOW MASTER SW
WINDOWLOCK SW
FRONT RH
UP DOWN
P11POWER WINDOWMOTOR FRONT LH
P12POWER WINDOWMOTOR FRONT RH
P 9POWER WINDOWCONTROL SW RH U
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(*2)
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IF
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1 BF2 4 BF2
Left kickpanel
1
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R–L
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R–L
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L–R
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(*1 )
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W–B
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2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
23
TO
YO
TA
TU
ND
RA
2
140A
ALT
( *1)
100A
ALT
( *2)
22 1
1
50A J/B
2
12
2
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2
12
2
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2 1
22
AC
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IG1
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AA
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T10TVIP BUZZER
18B
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34
2
1
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CTI
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CO
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6B
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15B
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2C
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4AUL3
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8BL2
W–G To Door Key Lock SWLH, RH<20–1><20–2>
9BUL1
L–R To Door Key Lock SWLH<20–1><20–2>
10BUL2
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(*6)
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G–R
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<1–2>
A10
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<9–1>
A12
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<27–3>
C6
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T11
T12
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(*4)
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* 2
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2003 TOY
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TU
ND
RA
(EW
D491U
)
M
1 2 3 4
24 TOYOTA TUNDRA
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2
2
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II Right kickpanel
A
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J13JUNCTIONCONNECTOR
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2
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2 2
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1 ID1
ID21
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ID22
IF Left kick panel
AJ 3JUNCTIONCONNECTOR
1G10 1G12
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P 6
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W–B
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Front left fender
A
AJ18JUNCTIONCONNECTOR
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8 IA4
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1
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LOC
K[IN
TEGR
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CO
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2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
25
TO
YO
TA
TU
ND
RA
W–G
Po
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41C
P16
PO
WE
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EA
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river
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)
FRONT
UP
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96
105
UP
DOWN
DOWN
FRONT
78
32
1B
I1
A
M2
1M
21
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P19
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Ver
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P17
POW
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P18
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AB
W–B
W–B
W–B
W–B
* 1
: Tow
ing
Pack
age
* 2
: Exc
ept T
owin
g P
acka
ge
L
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
26 TOYOTA TUNDRA
2
ACC
IG1AM1 4 1I2
20AWIP
1G3 1E3 1G2
2 2
2
40A AM
1140A
ALT (*1 )100A
ALT (*2 )
M
23 IA4
IF
M
10AGAUGE
1F5 1F3
1E6
5 B9 A
8 B 13 B12 B1 C1 A 7 A 2 B
2
1
EA
3 BI1
2 A
1 B
2 B
1 A (*9)
(*10)
(*9)
(*10)
IH
4 BI1
IE
17 8 7 16 2 111
1
2
2
3 5 2 1 4
C
L
L–R(*3)
B–Y
L–Y
B–Y
L–YL–Y
W
BB
–L (*1 ) B
(*2 )
L (*3 )
L
L
L–R
LG–R
LG–R
W–B
W–B
W–B
Y–B
P–B
BB
W–B
I23IGNITION SW
OFF
INT
LOW
HIGH
WASHER
WIPER RELAY
C17WIPER AND WASHER SW[COMB. SW](*3)
ESB+1+2
BATTERY
C11 C12,
COMBINATION METER
A B C13, C
WA
SHE
R
2
1
W 2
WA
SHE
R LEV
EL S
EN
SO
R[W
AS
HE
R M
OTO
R]
U 1
UN
LOC
K WA
RN
ING
SW
P ower S ource W iper and W asher K ey Reminder and S eat B e lt W arning
* 1 : Towing Package* 2 : Except Towing Package* 3 : w/ INT Time SW Mechanism* 4 : w/o INT Time SW Mechanism
* 6 : INT2* 7 : w/ Door Lock Control
+B +2 +1 +S *5 *6 B1 EW WF
AJ 3JUNCTIONCONNECTOR
SE
AT BELT
C
P–B E
E
BR
BR
J 8JU
NC
TION
CO
NN
ECTO
R
See Interior Light
System
<10–1>
B 7
A,
B
BU
CK
LE SW
LH
From Integration
Relay<
20–2><
21–2>
EJ 7JUNCTIONCONNECTOR
P–B
Right kickpanel
W 4WIPER MOTOR
C17WIPER AND WASHER SW[COMB. SW](*4)
MIST
OFF
LOW
HIGH
WASHER
+B +2 +1 +S EW WF
17 8 7 16 2 11
Y–L (*3 )
L–W(*3 )
W–B (*3 )
L–B(*3 )
W–B(*4)
L–W(*4)
L–B(*4)
Y–L(*4)
L–R(*4) L–R(*4)
W–B
L(*4 )
* 9 : w/ Power Seat
* 8 : w/o Door Lock Control
* 5 : INT1*10 : Bench Seat
Left kickpanel
B
B
J10JU
NC
TION
CO
NN
EC
TOR
B
B B
From C
enter Airbag
Sensor Assem
bly<17–4>
*11 : Separate Seat, Captain Seat(w/o Power Seat)
W–B
(*9, *10 )(*9, *10 )
W–B
(*11 )B
(*11 )
W–B
4 C
3 C
B 7
BU
CK
LE SW
LH
C
(*9, *10)
1
2
SHO
RT P
IN
2
10A D
OM
E
2
2
1
L–Y
4
3
W 2
WA
SHE
R M
OTO
R
Front leftfender
Left kickpanel
II
A
W–B
J13JU
NC
TION
CO
NN
ECTO
R
10 IA4
A B
A A
Right kickpanel
JUN
CTIO
NC
ON
NEC
TOR
BA
J23J24
, (*7 )
(*7 )P
–B(*8 )
From TV
IPEC
U<
23–3>P–B
E
(*7 )
(*7 )
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
27
TO
YO
TA
TU
ND
RA
Re
mo
te C
on
tro
l M
irro
rP
ow
er
So
urc
e
22 2
B–L(*8) B (*9)
BAT
TER
Y
140A ALT(*8)100A ALT(*9)
2 1
40A AM12
ACC
IG1
AM
1
31I
1
50A J/B
2 1
L–R
W
I23
IGN
ITIO
N S
W
A
A
7IB
3
MM
MM
11IB
310
IB3
12IB
31
IB3
11IF
310
IF3
12IF
3
IELe
ft ki
ckpa
nel
52
43
67
8
J 9
JUN
CTI
ON
CO
NN
EC
TOR
GR
W–B
Y–B
LG–R
P–B
L–B
R
Y–B
L–B
LG–R
W–B
Y–B
L–B
LG–R
Y–B
L–B
LG–R
Y–B
R
P–B
R10
RE
MO
TE C
ON
TRO
LM
IRR
OR
SW
Ho
rn
1G11
GR
GR
GR
LEFT
UP
LEFT
/U
PR
IGH
TD
OW
NR
IGH
T/D
OW
N
LHR
H
OPERATIONSW
SELECT SW
15A
AC
C
( A/T
)
( A/T
)
(M/T)
HL
VL
M+
E
B
HR
VR
10A HORN
B
W–G B
7 11K2
61
1
H 8
HO
RN
RH
1E8
H 7
HO
RN
LH
C16
HO
RN
SW
[CO
MB
. S
W]
W–G
2 1
12
SHORT PIN
2
12
43
IA49
2
5A ECU–B
2
B
FB
DA
JUNCTIONCONNECTOR
BAJ21 J22,
A22ACC CUT RELAY
See
Eng
ine
Con
trol
<5–
2>
W–R
IA5
17
L–R
W–R
( *12
)
W–R
( *13
)
W–R
L–R
L–O
( *11
)
( *10
)( *
10)
(*10)
( *12
) 2B
3A
3B
1A
1B
( *7)
5A
( *6)
AB
AA
W–B
J23
J24
,
JUN
CTI
ON
CO
NN
EC
TOR
AB
2B
3A
3B
1A
1B
( *7)
5A
( *6)
R 9 A , B
REMOTE CONTROLMIRROR RH
R 8 A , B
REMOTE CONTROLMIRROR LH
J10JUNCTIONCONNECTOR
AA
A
To TVIP ECU<23–4>
INTE
GR
ATI
ON
REL
AY
G–R(*1)
G–R
* 1
: 5V
Z–FE
w/ D
oor
Lock
Con
trol,
2UZ–
FE*
2 : 5
VZ–
FE w
/o D
oor L
ock
Con
trol w
/ Day
time
Run
ning
Lig
ht*
3 : 5
VZ–
FE w
/o D
oor L
ock
Con
trol w
/o D
aytim
e R
unni
ng L
ight
* 4
: 5V
Z–FE
w/ D
oor
Lock
Con
trol w
/ Day
time
Run
ning
Lig
ht, 2
UZ–
FE w
/ Day
time
Run
ning
Lig
ht*
5 : 5
VZ–
FE w
/ Doo
r Lo
ck C
ontro
l w/o
Day
time
Run
ning
Lig
ht, 2
UZ–
FE w
/o D
aytim
e R
unni
ng L
ight
* 6
: w/ M
irror
Hea
ter
* 7
: w/o
Mirr
or H
eate
r*
8 : T
owin
g Pa
ckag
e*
9 : E
xcep
t Tow
ing
Pac
kage
*10
: 2U
Z–FE
*11
: 5VZ
–FE
*12
: w/ D
oor
Lock
Con
trol
*13
: w/o
Doo
r Loc
k C
ontro
l
8IA
4
L–O
( *10
)
(*10)
121N
121L
( *2,
*4)
( *3,
*5)
G–R(*2, *4, *5)
G–R(*3)
*14
: w/ W
irele
ss D
oor
Lock
Con
trol
( *14
)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
1 2 3 4
28 TOYOTA TUNDRA
2
22
1G10
1I1
2
ACC
IG1AM1
3
P ow er S ource R ad io and P layer
L–R
WB
–L (*4 ) B
(*5 )
I23IGNITION SW
BATTERY
40A AM
1140A ALT (*4 )100A ALT (*5 )
2
22
1
11
1 21 21 21 2
IGInstrument panelbrace RH
2 1 2 1
2 IF1
IF410
3 IF1
IF45
2 IB2
IB410
3 IB2
IB45 3 BF22 BF23 BE22 BE2
1 BC1 2 BC1 1 BA1 2 BA1 2 BG2 1 BG2 2 BH1 1 BH1
1 B 5 B7 B 2 B 6 B 2 A 6 A 1 A
7 C
R 1 R 2,
RADIO AND PLAYER
A B
E FR+ FR– FL+ FL+ RL+ RR+ RR–
B
L
GR
WRYBVPLLG
BR LG L
P (*1 )LG
(*2 )
V (*1 )L (*2 )
B Y R WWRYB
LLGLLG
LLGLLG
RL+
LG L LG L
ACC AU1
(*1)
(*2)
15AACC
SW1
T 8TWEETER RH
T 7TWEETER LH
F 9FRONT DOOR SPEAKERRH
F 8FRONT DOOR SPEAKERLH
R 6REAR DOOR SPEAKERLH
R 7REAR DOOR SPEAKERRH
13 12
I25INTEGRATION CONTROLAND PANEL
(*3 )(*3 )
(*3 )(*3 )
(*3 )(*3 )
(*3 )(*3 )
(*3 )
(*3 )
(*3 )
(*3 )
SH
OR
T PIN
3 A
1
2
4
3
IA49
See Engine ControlSystem<5–2>
2
2
5AECU–B
2
1
2
2
1
20ARADIO
(*7)L–R(*6)
D A
F B
IA517
A22AC
C C
UT R
ELAY
JUN
CTIO
NC
ON
NE
CTO
R
BA
J21J22
,
11 IA5
B4
B
W
W–R(*1)
W–R
(* 2)
W–R(*1)
R
W–R
L–R(* 6)
W–R
(*2 )
L–R(*6 )
L–O(*6 )
L–R(*7 )
L–O(*6)
R
W–R
W–R
(*1)
* 1 : w/ Door Lock Control* 2 : w/o Door Lock Control* 3 : Access Cab* 4 : Towing Package
8 IA4
W–R
(*6)
(*6 )
R11, C
* 5 : Except Towing Package* 6 : 2UZ–FE* 7 : 5VZ–FE
B3
GR
ACC1
ACC
14
C6
R
EAU
SWG
10
C8
G–B
AU2
SW2
11
5 II1 3 II1 4 II1
G–BLR
C16STEERING PAD SW[COMB. SW]
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
29
TO
YO
TA
TU
ND
RA
2
ACC
IG1
AM
14
22 2
40A AM1140A ALT(*5)100A ALT(*6)
1I2
10A
GA
UG
E
1F8
1F5 9
A
TAC
HO
MET
ER
3C
1E6
1F3 5
B
2IE
1
IE1
7
4IE
36
IE3
25IE
2IE
23
2C
13C
12B
1C
13B
9B
4C
( *1)
( *2)
( *3)
( *4)
5IE
1
6B
7B
6A
8B
6C
5C
12A
3D
10D
8C
1A
10IE
1
IE1
138
IE1
IE1
24
IHR
ight
kic
k pa
nel
1
( *1)
( *2)
( *1)
( *2)
1B
1A
( *1)
( *2)
4B
B15
BB
1
6B
B1
C3
1
D
1112 2
2
DD
D
23
CC
21
L–YL–Y
W
L–YB–L(*5) B (*6)
B–Y
B–Y
G–O
G–O
G–O
G–O
BB
L–W
Y–R Y–R
BR
BR BR BR
Y–R
B–R
Y–R
B–R
Y–BY–B
B–Y
BR
Co
mb
ina
tio
n M
ete
rP
ow
er
So
urc
e
P–L
G–B
P–L
G–B
B–Y
B–Y
(*2)
I23
IGN
ITIO
N S
W
J 9
JUN
CTI
ON
CO
NN
EC
TOR
(*1)
From IntegrationRelay<30–7>
From 4WD ControlECU<18–4>
From Engine ControlModule<5–15><6–10> (*1)
(*2)
V 2
VE
HIC
LE S
PEE
DS
EN
SO
R( C
ombi
natio
n M
eter
)BA
TTER
Y
From Igniter<4–3>
From Engine ControlModule<5–15>
See Key Reminder andSeat Belt WarningSystem<26–3><26–4>
WASHER
MALFUNCTIONINDICATOR LAMP
A/T OIL TEMP.
O/D OFF
OIL
FUEL
SEAT BELT
DOOR
WATER TEMP.
FUEL
C11
C12
,
CO
MB
INAT
ION
MET
ER
AB
C13
, C
C14
, D
See Electronically ControlledTransmission andA/T Indicator System<14–5><15–5>
See Interior Light System<10–2>
F10
FUEL
SEN
DE
R
J 8
JUN
CTI
ON
CO
NN
ECTO
R
O 2OIL PRESSURE SW
See Engine ControlSystem<5–6><6–3>
See Wiper andWasher System<26–3>
( Con
t. n
ext
page
)
* 1
: 2U
Z–FE
* 2
: 5V
Z–FE
* 3
: 5V
Z–FE
A/T
* 4
: 5V
Z–FE
M/T
* 5
: Tow
ing
Pac
kage
* 6
: Exc
ept T
owin
g Pa
ckag
e
W 3 A , B
WATER TEMP. SENDER
See Interior LightSystem<10–1><10–2>
9IE
117
IE1
(*2) (*2)
(*2)(*2)
P–L(*1)
P–L(*1)
R–L(*1)
R–L(*1)
(*1)L–W
* 7
: w/ T
acho
met
er*
8 : w
/o T
acho
met
er
OIL
(*8) (*8)
(*7) (*7)
SHORT PIN
2
10A DOME
2
12
B
W
SP
EED
OM
ETE
RLC
D
1
O 6OIL PRESSURE SENDER
HEAT WIREY–B
(*8)
(*7)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
5 6 7 8
29 TOYOTA TUNDRA (Cont’ d)
3 B
4 B9 C11 B10 B1 D8 A 11 A 7 C 13 A
1B5
1E4
2
1
EAFront left fender
1
2
1
IF Left kickpanel
IA518
7 A 2 D 10 C14 B
12 C 1 B 16 B 9 D 8 D 7 D 6 D 5 D 4 D 15 B
W–B
W–B
W–B
G–W
G–W
W–B
W–B
Combina tion M ete r
A
4LO
4HI (*1 )
4WD
(*2 )
CR
UIS
E
CH
AR
GE
BR
AK
E
(*1 )
(*1 )
See 4WD
System
<18–2>
<19–4>
See C
ruise Control
System
<5–6>
<6–3>
See C
harging System
<1–4>
AB
S
VO
LT
TUR
N R
H
TUR
N LH
HIG
H B
EAM
L 2
See A
BS S
ystem<
16–2>
C11 C12,
COMBINATION METER
A B C13, C D, C14D N R P
A/T P
ILLUM
INATIO
N
SR
S
See Turn S
ignal andH
azard Warning
Light System<
11–3>
See Electronically Controlled Transmissionand A/T indicator System<14–6><15–6>
See H
eadlightS
ystem<
7–3><
8–3>
See Illumination
System<
9–3>
See S
RS S
ystem<
17–4>
See Illum
inationS
ystem<
9–3>
See 4W
D System
<19–4>
* 9 : w/ Daytime Running Light*10 : w/o Daytime Running Light
See Charging S
ystem<
1–4>
R–W
(*10 M/T )
(*9)G–W
R–W(*9 M/T)
W–B
II
J13JUNCTIONCONNECTOR
* 2 : 5VZ–FE
(*1 )
(*1 )
(*2)
(*2 )
* 1 : 2UZ–FE
1B6
A
A
AJ18JUNCTIONCONNECTOR
IE Left kick panel
A B
A A(M/T )
Right kick panel
W–B
W–B
J23 J24,
JUNCTIONCONNECTOR
A B
INTEGRATIONRELAY
B2
See K
ey Rem
inderand S
eat Belt
Warning S
ystem<
26–3>
J 3JUNCTIONCONNECTOR
R–W
(*9 A/T )
P 5PARKINGBRAKESW(A/T)
W–B
P 5PA
RK
ING
BRA
KESW
(M/T )
W–B
W–B
AA
1N13
1N1
B 2
BR
AK
E FLUID
LEVE
L WA
RN
ING
SW
(*10 M/T )
R–W
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
30
TO
YO
TA
TU
ND
RA
2
35
12
4
22
2
22
22
CC1E5
1I2
2
AC
C
IG1
AM1
4
EAIFA
1F9
32
14
Po
we
r S
ou
rce
Air
Co
nd
itio
nin
g
21 M
76
12B
9B
20A
10A
4B
13A
15A
+
RE
CFR
S
Rig
ht k
ick
pane
l
12
8IE
3
IE2
16
E
E
18A
19A
8A
4IE
1
B–Y
B–Y
L–R
Y–R
L–B
R
WB–L(*5) B (*6)
W–B
W–B
L–R
B–Y B–Y
L–R
B–L
B–Y
B
B–W
B–Y
B–Y
W–L
L–R
L–Y
L–B
W–L
L–R
L–Y
L–R
13IA
4
2IA
5 W–L
L–RB
5BL
OW
ER
RE
SIST
OR
HTR
REL
AY
B 6
BLO
WE
R S
W
I23
IGN
ITIO
N S
W
A13A/C THERMISTOR
A15AIR INLETCONTROLSERVO MOTOR
B 6DEFROSTER SW[BLOWER SW]
BA
TTE
RY
40A AM1
50A HTR
140A ALT(*5)100A ALT(*6)
10A GAUGE
22
2
5
3
11
1
B 4
BLO
WE
RM
OTO
R
48
M1
M2
LOH
15
1
(*2) (*2)
(*1) (*1)
( *3)
( *4)
* 1
: 2U
Z–FE
* 2
: 5VZ
–FE
* 3
: 5VZ
–FE
A/T
* 4
: 5VZ
–FE
M/T
J 1
JUN
CTI
ON
CO
NN
EC
TOR
19IA
4
I24
I25
,
INTE
GR
ATI
ON
CO
NTR
OL
AN
D P
ANE
L
AB
2 1
2
22
W–L
10A
A/C
1 2
12
E
J 8
JUN
CTI
ON
CO
NN
EC
TOR
A/C MAGNETICCLUTCH
L–R
L–R
L–R
L–R
B–Y
W–G
W–G
L–B L–B
Y–RII
A
W–B
1B
J13
JUN
CTI
ON
CO
NN
ECTO
R
AW
–B
From Engine ControlModule<5–9><6–10>
B–L
MG
CA
IND
( *1)
AC
T(*2
)A/
CM
( *1)
AC1(
*2)
GN
D
BL
INE
IGR
EC
FRS
1
50A J/B
2
2
L–Y
B EC
W–G
L–Y
L–R
( *2)
3
W–B
W–B
W–B
W–B
J 3
JUN
CTI
ON
CO
NN
EC
TOR
A
1B
( *2)
3A
( *1)
( Con
t. n
ext
page
)
EB–
Y
A A
J18
JUN
CTI
ON
CO
NN
ECTO
R
(*2)*
5 : T
owin
g P
acka
ge*
6 : E
xcep
t Tow
ing
Pack
age
A 2
A 3
,
A/C
MA
GN
ETI
C C
LUTC
H
BA
DL–
R( *
1)
( *2)
L–R
( *1)
SHORT PIN
22
10A DOME
B
12
1
2
5A ECU–B
2
W–R(*1)
Fron
t lef
t fen
der
Left
kick
pan
el
AW
–R( *
1)
W–B
(*2)(*2)
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
M
7 865
B13
7 BB8
To Passenger A
irbagM
anual On–O
ff SW
<17–2>
30 TOYOTA TUNDRA (Cont’ d)
3 A
14 B
A4 5 A B A7
From 4W
D C
ontrol EC
U<
18–3><
18–4>
From P
assenger Airbag
Manual O
n–Off S
W<
17–1>
To Com
bination Meter
<18–2>
3B2 1 A
8 IA4 17 IA4
1
2
15AACC
B
1I1
1G10
5ACARGOLP
1K2
9 A
12 A
1H10
1A71H2
1D2
To Turn Signal
Flasher<11–2>
2
3
1A2
1J8
IFLeft kick panel
A6 A16
In teg ration C on tro l and P ane lA ir Conditioning C argo L ight
B
C
E
1E6
4 1F
I24 I25,
INTEGRATION CONTROL AND PANEL
A B
5
GR
L–YL–Y
G–O
R–B
W–B
W–B
R–B
W–B
R
W–L
OO B–R G
–Y
P Y–B
BR–Y
R–B
R–B
L–R(*2)
L–Y
W–G
A 1
A/C
DU
AL PR
ESS
UR
E SW
J 3JUNCTIONCONNECTOR
5
A
11
* 1 : 2UZ–FE
(*1 )
(*1 )
(*1 )
(*1 ) H10CARGO LIGHT[HIGH MOUNTED STOP LIGHT]
See R
adio and Player
System
<28–3>
B11
L–W
IH Right kick panel
W–B
ACC B ACC1 +B
BKLD H–L 2–4 IND1 IND2 GND1 PIND ILL+ ILL– IL–1 LIG+ AC+2
W–G
A17
G–R
B1
To Turn Signal
Flasher<11–2>
See Illumination
System<
9–3>
BUCKLE SW
S 5SE
AT B
ELT WA
RN
ING
OC
CU
PAN
T DETEC
TION
SEN
SOR
AN
D B
UC
KLE
SW
RH
To CenterAirbagSensorAssembly<17–3>
1
3
2
B–L
(*2 )
(*2 )(*2 )
(*2 )
A21
A/C
(*1 )From
Engine Control M
odule<
5–15>L
*10 : w/o Daytime Running Light
* 8 : w/o Door Lock Control* 7 : w/ Door Lock Control
* 9 : w/ Daytime Running Light
B A
C B
J23 J24,
JUNCTIONCONNECTOR
A B
1
2
4
3
IA49
AW–R(*1)
DL–R(*1)
17 IA5
D A
F B
A22ACC CUTRELAY
J21 J22,
JUNCTIONCONNECTOR
A B
See Engine C
ontrolS
ystem<
5–2>
L–O
(*1)
L–R(*1)
L–R(*1 )
L–O(*1 )
W–R
(*8 )
W–R
(*7 )
W–R
(*7)
W–R
(*1)
W–R
(*7)
1N11
To Turn Signal
Flasher<11–2>
1L11
INTEGRATIONRELAY
To CombinationMeter<29–2>
* 2 : 5VZ–FE
8 IA4
(*9)
(*10)
5 1N
10 1L
(*9)
(*10)W
–R
2003 TOYOTA TUNDRA (EWD491U)
M OVERALL ELECTRICAL WIRING DIAGRAM
12
34
31
TO
YO
TA
TU
ND
RA
2
30A TOWING
12
140A
ALT
( *1)
100A
ALT
( *2)
12
30A TOW BRK
12
30A TOW TAIL
12
30A SUB BATT
12
40A AM1
2 1
22
22
2
2
AC
C
IG1
AM1
4
1I2
10A GAUGE
1E5
B–Y(*1) C C (*1)
B–Y
2
12
53
EA
Fron
t lef
tfe
nder
2
(*1)W–B
C C (*1)W–B
A A (*1)W–B
22
I23
IGN
ITIO
N S
W
2
12
53
222
12IA
420
IA4
4B
B2B
R–B
G
R–B
1IA
4
2
1B
B2
21IA
4
1
5B
B26
BB2
3B
K11
BK1
4B
5A
3B
3A
6A
1B
2A
2B
K11
BK2
4B
K12
BK2
BL
Sur
roun
ding
of
the
front
of
the
fuel
tank
42
BR
R
BR
R
BR(*1) G(*2)
R(*1)Y(*2)
2B
B2
1A
2B
7A
IHR
ight
kic
kpa
nel
C C
134
5
4A
3B
K2
W
B
G(*1)BR(*2)
L
W
B
89
3
Y
G–Y
G–B
G–W
T 6
A,
B
TRA
ILER
SO
CKE
T
AB
AA
JUNCTIONCONNECTOR
BAJ23 J24,
IELe
ft ki
ckpa
nel
6
T 9
TOW
ING
CO
NV
ERTE
RG
ND
+BR
TIN
LTIN
STIN
RTO
TLT
OT
TAIL
STO
P+B BR
KG
ND
B–Y B–Y
G
G–W
B–RB–R
W–B
BR
L
(*1)
(*1)(*1) (*1)
(*1)
(*1)
From Stop LightSW<13–3>
From IntegrationRelay<9–4>
From Stop LightSW<13–3>
From
Tur
n S
igna
lFl
ashe
r<11
–4>
W–B
Y
BR
L
G
L
B
W–B
W–BW–B
IA44
(*1)
( *1)L
(*1)
L
(*1) (*1)
(*1)
G
To Light Control SW[COMB. SW]<9–1>
J 8
JUN
CTI
ON
CO
NN
EC
TOR
J18
JUN
CTI
ON
CO
NN
EC
TOR
J 1
JUN
CTI
ON
CO
NN
EC
TOR
J 2
JUN
CTI
ON
CO
NN
EC
TOR
TOW
TAI
LR
ELA
Y
B–W
B–W
L–W
(*1)
W(*1)
L–W(*1)
B–W
B–R
(*1)
B–Y
( *1)
B–Y
B–L(*1) B (*2)
BA
TTE
RY
SUB
BA
TTR
ELA
Y
O 5
OPT
ION
CO
NN
EC
TOR
From Back–Up Light Relay<12–3>
( *1)
( *2)
( *1)
( *2)
Po
we
r S
ou
rce
Tra
iler
To
win
g*
2 : E
xcep
t Tow
ing
Pac
kage
* 1
: Tow
ing
Pack
age
(*1)BR(*1)
B/U
PS
TTL
STTR
GN
DB
ATT
TAIL
BR
K
(*1)(*1)
(*1) (*1)
M OVERALL ELECTRICAL WIRING DIAGRAM
2003 TOYOTA TUNDRA (EWD491U)
270
M
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
271
[A] : System Title
[B] : Indicates the wiring color.
Wire colors are indicated by an alphabetical code.
B = Black W = White BR = Brown
L = Blue V = Violet SB = Sky Blue
R = Red O = Orange LG = Light Green
P = Pink Y = Yellow GR = Gray
G = Green
The first letter indicates the basic wire color and thesecond letter indicates the color of the stripe.Example: L – Y
L(Blue)
Y(Yellow)
[C] : The position of the parts is the same as shown inthe wiring diagram and wire routing.
[D] : Indicates the pin number of the connector.The numbering system is different for femaleand male connectors.Example : Numbered in order
from upper left tolower right
Numbered in orderfrom upper right tolower left
Female Male
The numbering system for the overall wiringdiagram is the same as above
[E] : Indicates a Relay Block. No shading is used and only the Relay Block No. is shown to distinguishit from the J/B.Example : Indicates Relay Block No.1
[F] : Junction Block (The number in the circle is theJ/B No. and the connector code is shown besideit). Junction Blocks are shaded to clearlyseparate them from other parts.
3C indicatesthat it is insideJunction BlockNo.3
Example:
[G] : Indicates related system.
[H] : Indicates the wiring harness and wiring harnessconnector. The wiring harness with maleterminal is shown with arrows ( ).Outside numerals are pin numbers.
Female Male ( )
[I] : ( ) is used to indicate different wiring andconnector, etc. when the vehicle model, engine type, or specification is different.
[J] : Indicates a shielded cable.
[K] : Indicates and located on ground point.
[L] : The same code occuring on the next pageindicates that the wire harness is continuous.
SYSTEM INDEXM
OV
ER
ALL E
LEC
TR
ICA
L WIR
ING
DIA
GR
AM
2003 TOY
OTA
TU
ND
RA
(EW
D491U
)
272
SYSTEMS LOCATION SYSTEMS LOCATIONABS 16–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning 30–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back–Up Light 12–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo Light 30–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 24–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clock 24–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Meter 29–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control (2UZ–FE) 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control (5VZ–FE) 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Lock Control (w/ Daytime Running Light) 20–2. . . . . . . . . . . . . . . . .
Door Lock Control (w/o Daytime Running Light) 21–2. . . . . . . . . . . . . . . .
Electronically Controlled Transmission and A/T Indicator (2UZ–FE) 14–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronically Controlled Transmission and A/T Indicator (5VZ–FE) 15–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Control (2UZ–FE) 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Control (5VZ–FE) 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Light (w/ Daytime Running Light) 12–2. . . . . . . . . . . . . . . . . . . . . . . .
Fog Light (w/o Daytime Running Light) 8–3. . . . . . . . . . . . . . . . . . . . . . . . .
Headlight (w/ Daytime Running Light) 7–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight (w/o Daytime Running Light) 8–2. . . . . . . . . . . . . . . . . . . . . . . . .
Horn 27–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition (2UZ–FE) 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition (5VZ–FE) 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illumination 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integration Control and Panel 30–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Light 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Reminder 26–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Light Auto Turn Off (w/ Daytime Running Light) 20–4. . . . . . . . . . . . . . . .
Light Auto Turn Off (w/o Daytime Running Light) 21–4. . . . . . . . . . . . . . .
Mirror Heater 17–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Outlet 24–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Seat 25–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source 1~31–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Window 22–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio and Player 28–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Mirror 27–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Belt Warning 26–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS 17–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting (2UZ–FE) 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting (5VZ–FE) 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Light 13–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taillight 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer Towing 31–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal and Hazard Warning Light 11–2. . . . . . . . . . . . . . . . . . . . . . . . .
TVIP 23–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper and Washer 26–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wireless Door Lock Control 23–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4WD (2UZ–FE) 18–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4WD (5VZ–FE) 19–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .