Airbag

52B-1

GROUP 52B

SUPPLEMENTAL RESTRAINT

SYSTEM (SRS)CONTENTS

GENERAL INFORMATION . . . . . . . . 52B-3

SERVICE PRECAUTIONS. . . . . . . . . 52B-24

SRS AIR BAG DIAGNOSIS. . . . . . . . 52B-27INTRODUCTION TO DIAGNOSIS . . . . . . . 52B-27TROUBLESHOOTING STRATEGY . . . . . . 52B-27DIAGNOSTIC FUNCTION . . . . . . . . . . . . . 52B-27SRS WARNING LIGHT CHECK . . . . . . . . . 52B-30PASSENGER'S SEAT BELT WARNING LIGHT CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52B-30PASSENGER'S AIR BAG OFF INDICATOR LIGHT CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52B-30CHECK CHART FOR DIAGNOSIS CODES 52B-32DIAGNOSTIC TROUBLE CODE PROCEDURES. . . . . . . . . . . . . . . . . . . . . . 52B-38DIAGNOSTIC TROUBLE CODE CHART

. . . . . . . . . . 52B-292DIAGNOSTIC TROUBLE CODE PROCEDURES . . . 52B-294TROUBLE SYMPTOM CHART . . . . . . . . . . 52B-344SYMPTOM PROCEDURES . . . . . . . . . . . . 52B-345DATA LIST REFERENCE TABLE. . . . . . . . 52B-354ACTUATOR TEST REFERENCE TABLE . . 52B-355FAIL-SAFE FUNCTION REFERENCE TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52B-355ACCURACY CHECK OF OCCUPANT CLASSIFICATION SENSOR. . . . . . . . . . . . 52B-355

SPECIAL TOOLS . . . . . . . . . . . . . . . . 52B-356

TEST EQUIPMENT. . . . . . . . . . . . . . . 52B-357

Continued on next page

Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.

WARNING

WARNING Carefully read and observe the information in the SRS SERVICE PRECAUTIONS prior to any service. For information concerning diagnosis or maintenance, always observe the procedures in the SRS Diagnosis or

the SRS Maintenance sections, respectively.

If any SRS components are removed or replaced in connection with any service procedures, be sure to follow the

procedures in the INDIVIDUAL COMPONENT SERVICE section for the comportments involved. If you have any questions about the SRS, please contact the MMNA Tech Line.

52B-2

POST-COLLISION DIAGNOSIS . . . . 52B-358

INDIVIDUAL COMPONENT SERVICE52B-364

ON-VEHICLE SERVICE. . . . . . . . . . . 52B-364ACCURACY CHECK OF OCCUPANT CLASSIFICATION SENSOR . . . . . . . . . . . 52B-364

FRONT IMPACT SENSORS . . . . . . . 52B-367REMOVAL AND INSTALLATION . . . . . . . . 52B-367INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 52B-370

SRS CONTROL UNIT (SRS-ECU). . . 52B-371REMOVAL AND INSTALLATION . . . . . . . . 52B-371INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 52B-374

DRIVER'S AIR BAG MODULE AND CLOCK SPRING . . . . . . . . . . . . . . . . . . . . . . . 52B-375

REMOVAL AND INSTALLATION . . . . . . . . 52B-375INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 52B-380

PASSENGER'S (FRONT) AIR BAG MODULE . . . . . . . . . . . . . . . . . . . . . . 52B-382

REMOVAL AND INSTALLATION . . . . . . . . 52B-382INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 52B-385

KNEE AIR BAG MODULE. . . . . . . . . 52B-386REMOVAL AND INSTALLATION . . . . . . . . 52B-386INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 52B-389

SIDE-AIRBAG MODULE(S). . . . . . . . 52B-390REMOVAL AND INSTALLATION . . . . . . . . 52B-390

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-393

CURTAIN AIR BAG MODULE(S). . . . 52B-394REMOVAL AND INSTALLATION . . . . . . . . 52B-394INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-397

SIDE IMPACT SENSOR . . . . . . . . . . . 52B-398REMOVAL AND INSTALLATION . . . . . . . . 52B-398INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-400

SEAT BELTS WITH PRE-TENSIONER. . . . . . . . . . . . . . . . 52B-401

REMOVAL AND INSTALLATION . . . . . . . . 52B-401INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-405

SEAT SLIDE SENSOR . . . . . . . . . . . . 52B-405REMOVAL AND INSTALLATION . . . . . . . . 52B-405INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-407

OCCUPANT CLASSIFICATION-ECU 52B-408REMOVAL AND INSTALLATION . . . . . . . . 52B-408INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-410

PASSENGER SEAT WEIGHT SENSOR . . . . . . . . . . . . . . . . . . . . . . . 52B-410

REMOVAL AND INSTALLATION . . . . . . . . 52B-410INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 52B-412

AIR BAG MODULE DISPOSAL PROCEDURES . . . . . . . . . . . . . . . . . . 52B-412

SEAT BELT PRE-TENSIONER DISPOSAL PROCEDURES . . . . . . . . . . . . . . . . . . 52B-427

GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-3

GENERAL INFORMATIONM1524000102491

DANGERThe SRS-ECU adopts the rollover specifica-tion that the curtain airbag and seat belt pre-tensioner operate at the occurrence of rollover. Therefore, do not tilt the vehicle to the right and left with the IG ON or tilt the SRS-ECU to the right and left with the IG ON and the harness installed..

WARNINGImproper service could result in serious injury of the service personnel or the pas-senger..

The SRS is designed to supplement the front seat belts. It reduces injury to the driver(s) and the front passenger(s) by deploying air bag(s) in case of a frontal collision. In addition, the side-airbag and cur-tain air bag inflate upon a side collision to reduce the risk of passenger injuries.The SRS front air bags from an advanced air bag system together with sensors at the vehicle and sen-sors attached to front seats..

Side-airbag systems in the front seats are activated when side impacts exceed a criteria to protect the occupants upper bodies..

The curtain airbag system operates together with the side-airbag to protect the heads of passengers in the front and second seats..

The seat belts with pre-tensioner work simulta-neously with the SRS. The seat belt incorporating the pre-tensioner automatically winds the seat belt upon front impact to reduce forward shifting of the drivers and passengers. The seat belt use status is used to control the activation and deactivation of the pre-ten-sioner..

The SRS consists of air bag modules, SRS air bag control unit (SRS-ECU), front impact sensors, side impact sensors, SRS warning light, passengers air bag OFF indicator light, passengers seat belt warn-ing light, clock spring, seat belt pre-tensioner, seat belt switch, seat slide sensor, weight sensor and occupant classification-ECU. Air bag modules are located in the center of the steering wheel and above the glove box. Knee air bag is installed under the col-umn cover. Side-airbags are located inside the front seatback assemblies. The curtain air bag module consists of an air bag, an inflator, and the fixing gear relating to those parts, and is installed in the roof side sections (from the driver's and the passenger's front pillars to the rear pillars). Each air bag consists of a folded air bag and an inflator unit. The SRS-ECU placed on the forefront of the floor monitors the sys-tem and has a front air bag safing G-sensor, front air bag analog G-sensor and a side-airbag safing G-sensor. The front impact sensor is assembled in the front end upper bar to monitor impact in case of front impact. The side impact sensors inside the cen-ter pillars and the rear quarter panel monitor the shock incurred by the sides of the vehicle. The SRS warning light on the combination meter indicates the operational status of the SRS. The clock spring is installed in the steering column. The seat belt pre-tensioner is built into the driver's and passen-ger's front seat belt retractor. The seat slide sensor is installed at the seat adjuster section of the driver seat in order to detect the driver seat slide position. The weight sensor is installed underneath a rail of the passenger seat to detect the load on the seat. The passengers air bag OFF indicator light is installed to the lower left of the center panel, and illu-minates when the passenger seat airbag is inactive. The passengers seat belt warning light is installed to the lower right of the center panel, and illuminates when the passenger is not wearing the seat belt. The seat belt switch detects whether the seat belt is used.Only authorized service personnel should do work on or around the SRS components. Those service per-sonnel should read this manual carefully before start-ing any such work.

.TSB Revision

GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-4

ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT FUNCTIONThe SRS-ECU monitors the SRS system and stores data con-cerning any detected faults in the system. When the ignition switch is in "ON" position, the SRS warning light, passengers air bag OFF indicator light and passengers seat belt warning light should illuminate for about seven seconds and then turn "OFF." That indicates that the SRS system is in operational order. If the SRS warning light does any of the following, the immediate inspection by an authorized dealer is needed:1. The SRS warning light does not illuminate as described

above.2. The SRS warning light stays on for more than seven

seconds.3. The SRS warning light illuminates while driving.If a vehicle's SRS warning light is in any of these three condi-tions, the SRS system must be inspected, diagnosed and ser-viced in accordance with this manual.

AC905530

SRS warning light

AB

TSB Revision


CONSTRUCTION DIAGRAM

NOTE: This construction diagram shows the general view of the SRS components. For details, refer to "Schematic (P.52B-9), "Configuration Diagrams (P.52B-12), " and "Circuit Diagram (P.52B-13)".

ACA03533

ACA03210

Side impact sensor (front)

Side impact sensor (rear)

Side-airbag module

Seat belt pre-tensioner

Occupant classification-ECU

Seat slide sensor

AB

Curtain air bag module

Front impact sensor

Weight sensor

Seat belt pre-tensioner

Inner seat belt (seat belt buckle switch)

SRS-ECU

SRS warning lamp

Driver's air bag module

Clock spring

Passenger's (front) air bag module

Passenger's air bag OFF indicator light Knee air bag module

Data link connector

Passenger's seat belt warning lightTSB Revision


WARNING/CAUTION LABELSA number of caution labels related to the SRS are found in the vehicle, as shown in the following illustrations. Follow label instructions when servicing SRS. The label I is not to be removed except by owner. If the other labels are dirty or damaged, replace them.

AC904461 AC904497

AC904540

AC904861 AC904335

ACA03025ACA03014

ACA03013

ACA03208

Driver's air bag module SRS-ECUPassenger's (front)air bag module

Knee air bag module Sunvisor

Seat belt pre-tensioner(right and left)

Side-airbag module(right and left)

Curtain air bag module(right and left)

Glove boxCenter pillar (right and left)

G

F

ED

B

C

I

J

A

H

E

ABTSB Revision


Label contentsA, B, D DANGER

FLAMMABLE EXPLOSIVEDO NOT:DISASSEMBLE; HEAT; INCINERATE; APPLY ELECTRICITY;OR STORE AT HIGH TEMPERATURE (93C or HIGHER).REFER TO WORKSHOP MANUAL FOR DETAILS.

C CAUTION: DO NOT DISASSEMBLE OR DROP. IF DEFECTIVE, REFER TO SERVICE MANUAL.

E

WARNINGEVEN WITH ADVANCED AIR BAGS Children can be killed or seriously injured by the air bag The back seat is the safest place for children Never put a rear-facing child seat in the front Always use seat belts and child restraints See owners manual for more information about air bags

E

WARNINGDEATH or SERIOUS INJURY can occur Children 12 and under can be killed by the air bag. The BACK SEAT is the SAFEST place for children. NEVER put a rear-facing child seat in the front. Sit as far back as possible from the air bag. ALWAYS use SEAT BELTS and CHILD RESTRAINTS.

F DANGER; BELT PRETENSIONER DO NOT DISSEMBLE OR IMPACT. REFER TO SERVICE MANUAL FOR INSTRUCTION, HANDLING, STORAGE AND

DISPOSAL PROCEDURES.G WARNING

SRS AIR BAG MODULE FLAMMABLE/EXPLOSIVETO AVOID SERIOUS INJURY: DO NOT REPAIR, DISASSEMBLE OR TAMPER. AVOID CONTACT WITH FLAME OR ELECTRICITY. DO NO DIAGNOSIS/USE NO TEST EQPT OR PROBES. STORE BELOW 200F (93C). BEFORE DOING ANY WORK INVOLVING MODULE. READ SERVICE MANUAL

FOR IMPORTANT FURTHER DATA.H DANGER

FLAMMABLE EXPLOSIVESRS AIR BAG MODULE Do not disassemble or shock Do not heat or incinerate. Do not contact with electricity or tester probes. Do not test or diagnose. Do not store in more than 200 F (93 C). Store the air bag cover is top. For information on handling, replacement, and disposal methods, refer to the service

AC306673TSB Revision

manual.


I SRS SIDE AIRBAGWARNINGTO AVOID SERIOUSINJURY OR DEATH: Do not lean against the door. Do not use seat covers. See owners manual for more information

J

This Vehicle is Equipped with Advanced Air Bags Even with Advanced Air BagsChildren can be killed or seriously injured by the air bag. The back seat is the safest place for children.Never put a rear-facing child seat in the front.Always use seat belts and child restraints.See owners manual for more information about air bags.Not to be removed except by owner.

J

WARNINGMISE EN GARDEChildren Can Be KILLED or INJURED by Passenger Air Bag The back seat is the safest place for children 12 and under.Make sure all children use seat belts or child seats.Not to be removed except by owner.

Label contentsTSB Revision


SCHEMATIC

ACA03532

Side-airbag module (LH)

Side-airbag module (RH)

Seat belt pre-tensioner (LH)

Seat belt pre-tensioner (RH)

Side impact sensor (Front: LH)

Side impact sensor (Front: RH)

Data link connector (for scan tool)

Combination meter

CLOCK SPRING



Seat belt switch (Passenger's side)

CAN bus line

Front impact sensor (RH)

Front impact sensor (LH)

Curtain air bag module (LH)

Curtain air bag module (RH)

AB

SRS-ECUIgnition switch (IG1) Fusible link

Note* : Connector lock switch Connector connected: ON Connector disconnected: OFF

ONOFF

OFF

OFFON ON

OFF

ONOFF

ON

ON

OFFON

OFFON

OFF

ONOFFON

OFF

OFF

ONOFFON

ONOFFON

OFF

ONOFF

OFF

OFFON ON

ON

OFF

ONOFF

ON

OFF

OFFON

OFF

ONOFFONOFF

ONOFF

ONOFF

ONOFF

ONOFF

ON

ONOFF

ON

ONOFFON

OFF

ONOFFON

OFF

ONOFF

ON

OFF

OFFON

OFF

ON

ONOFF

ON

OFF

OFF

ONOFF

ON

OFF

ONOFF

ON

OFF

ONOFF

ON

OFF

ONOFF

ON

OFF

ON

7.5A 7.5AETACS-ECU Passenger's air bag

OFF indicator light

OFF

IG1 RELAY

Driver's knee air bag module

Seat belt switch (Driverr's side)

Side impact sensor (Rear: LH)

Side impact sensor (Rear: RH)TSB Revision


SRS AIR BAG SPECIAL CONNECTOR.

To enhance the system reliability, a connector short circuiting mechanism is integrated in the SRS-ECU connector, air bag module connectors, clock spring connector, pre-tensioner con-nectors, and intermediate connector between curtain air bag module and SRS-ECU (black connector "A" shown in the fig-ure).

.

ACA03536

A

A A

A

A

A

A

A

A

Side-airbag module (RH)

Seat belt pre-tensioner (LH)

Side-airbag module (LH)

Seat belt pre-tensioner (RH)



Curtain air bag module (LH)

Curtain air bag module (RH)

Driver's knee air bag module

Clock springSRS-ECU

A

A

ABTSB Revision


SQUIB CIRCUIT CONNECTOR LOCK SWITCH

This mechanism prevents the improper deployment of air bag module because of the current application to the squib due to the static electricity when connec-tors between SRS-ECU and air bag modules (squibs) are disconnected. When the connector is disconnected, the short spring short circuits the power supply side terminal and ground side terminal of squibs, and prevents the static electricity from generating the potential difference. This connector mechanism is adopted for the following connectors.

SRS-ECU connector Connector between the clock spring and

body-side wiring harness Each air bag module connector Each pre-tensioner connector Intermediate connector between curtain air bag

module and SRS-ECU

AC904997AC

SRS-ECU connector

Partition panel

Wiring harness-side connector (terminal to short-circuit)

Short spring Partition panel (SRS-ECU-side connector)l

Short spring (wiring harness-side connector)

Connector connected

Terminal to short-circuit

Wiring harness-side connectorTSB Revision


CONFIGURATION DIAGRAMS

ACA03517

A-58

C-316

C-313

C-114

C-203

C-124C-125C-126

D-46D-33

D-40D-39

D-32

D-48

D-09D-17

D-43

D-29D-28

D-03

D-01

D-42

AB

STEERING COLUMNENGINE COMPARTMENT

C-205

FLOOR

INSTRUMENT PANEL

C-223

A-45

C-227TSB Revision


CIRCUIT DIAGRAMWARNING

Do not repair, splice, or modify the SRS wiring (except for specific repairs to the instrument panel wiring harness and the floor wiring harness shown on P.52B-24): replace the wiring if necessary, after read-ing and following all precautions and pro-cedures in this manual.

Do not use an analog ohmmeter to check the SRS wiring or components; use only the special tools (refer to P.52B-356) and a digital multi-meter (refer to P.52B-357).CAUTION

Improper services cause the system to be inop-erative. Do not disassemble or tamper with the SRS components to prevent the serious injury.

A-45 (Y) Front impact sensor (LH) A-58 (Y) Front impact sensor (RH) C-114 (Y) Passengers (Front) air bag moduleC-124 (Y) SRS-ECUC-125 (Y) SRS-ECU C-126 (Y) SRS-ECU C-203 Combination meterC-205 (GR) Center panel unit C-223 (B) Drivers knee air bag moduleC-227 (B) Date link connector

ACA03524

D-48-5

D-48-3

D-48-1D-48-2

D-48-4D-48-6

AB

SEAT C-313 (Y) Clock springC-316 (B) Drivers air bag moduleD-01 (Y) Side impact sensor (Front: RH)D-03 (B) Seat belt pre-tensioner (RH)D-09 (B) Curtain air bag module (RH) D-17 (B) Curtain air bag module (LH)D-28 (B) Seat belt pre-tensioner (LH)D-29 (Y) Side impact sensor (Front: LH)D-32 (Y) Side-airbag module (LH)D-33 (B) Seat belt switch (Drivers side)D-39 (Y) Side-airbag module (RH)D-40 (B) Seat belt switch (Passengers side)D-42 (Y) Side impact sensor (Rear: RH)D-43 (Y) Side impact sensor (Rear: LH)D-46 (GR) Seat slide sensorD-48 Front seat assembly (RH)D-48-1 Occupant classification-ECUD-48-2 Occupant classification-ECUD-48-3 Weight sensor (Front:LH)D-48-4 Weight sensor (Front:RH)D-48-5 Weight sensor (Rear:LH)D-48-6 Weight sensor (Rear:RH)TSB Revision


ACA03462

FRONT IMPACT SENSOR (LH)

FRONT IMPACT SENSOR (RH)

SRS-ECU

CLOCK SPRING

DRIVER'S AIR BAGMODULE (SQUIB)

DRIVER'S AIR BAGMODULE (SQUIB)

NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR UNCOUPLED : OFF

ABTSB Revision


ACA03463

DRIVER'S KNEE AIR BAG MODULE (SQUIB) SEAT BELT PRE-TENSIONER (LH)

PASSENGER'S (FRONT)AIR BAG MODULE (SQUIB)

SEAT BELT PRE-TENSIONER (RH)

SRS-ECU


ABTSB Revision


ACA03464

SIDE IMPACT SENSOR (LH)SIDE IMPACT SENSOR (REAR: LH)

SIDE-AIRBAG MODULE (SQUIB) (LH)

CURTAIN AIR BAG MODULE (SQUIB) (LH)


AB

SRS-ECUTSB Revision


ACA03465

SIDE IMPACT SENSOR (RH)

SIDE IMPACT SENSOR (REAR: RH)

SIDE-AIRBAG MODULE(SQUIB) (RH)

CURTAIN AIR BAG MODULE (SQUIB) (RH)

CENTER PANEL UNIT

12

INTERFACE CIRCUIT

AIR BAG OFF INDICATOR LIGHTPASSENGER'S SIDE

ETACS-ECU (FUSE )

SRS-ECU

AB

NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR UNCOUPLED : OFFTSB Revision


ACA03466

ETACS-ECU

IG1 RELAY

SRS-ECU

JOINTCONNECTOR (2)

FUSIBLELINK 34

IGNITION SWITCH (IG1) OR OSS-ECU (IG1)

ABTSB Revision


FRONT SIDE

COMBINATION METER

CPU

CAN DRIVE CIRCUIT

INTERFACE CIRCUIT

CAN DRIVE CIRCUIT

INTERFACE CIRCUIT

ETACS-ECU

CAN TRANSCEIVER CIRCUIT

RHEOSTATLCD (SRS)

(FUSE )12DATA LINK CONNECTOR

GROUNDING CONNECTOR

JOINTCONNECTOR (CAN1)

ACA03467ABTSB Revision


ACA03468

(FUSE )17ETACS-ECU

OCCUPANT CLASSIFICATION-ECU

SEAT SLIDE SENSOR

FRONT SEAT ASSEMBLY (RH)

JOINT CONNECTOR (CAN1)

HALL IC

ABTSB Revision


ACA03469

WEIGHT SENSOR (FRONT: LH)

WEIGHT SENSOR (REAR: LH)

WEIGHT SENSOR (REAR: RH)

WEIGHT SENSOR (FRONT: RH)

OCCUPANT CLASSIFICATION-ECU

ABTSB Revision


HALL IC

ACA03470

SEAT BELT SWITCH DRIVER'S SIDE

SRS-ECU

HALL IC

SEAT BELT SWITCH PASSENGER'S SIDE

ABTSB Revision


COMPONENT LOCATION

NOTE: The illustration above shows the front impact position of the front impact sensor (LH) and the side

AC905341

AC904903

ACA03556

ACA03106

Occupant classification-ECU

Seat slide sensor

Weightsensor

Data link connector

Side impact sensor (Rear)

Side impact sensor (Front)

Front impact sensor

F

Curtain air bag module

Driver's air bag moduleClock spring Passenger's (front) air bag module

G and yawrate sensor

SRS-ECU

ETACS-ECU

Head light assembly (LH)

Front seat belt (LH)

AB

Rear seat beltTSB Revision

sensor (RH) and the side impact sensor (RH). The impact sensor (LH) is symmetrical to this.

SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-24

SERVICE PRECAUTIONSM1524000301975

DANGER In order to avoid injury to yourself or others from

accidental deployment of the air bag during servic-ing, read and carefully follow all the precautions and procedures described in this manual.

After disconnecting the battery cable, wait 60 sec-onds or more before proceeding with the following work. The SRS system is designed to retain enough voltage to deploy the air bag for a short time even after the battery has been disconnected, so serious injury may result from unintended air bag deployment if work is done on the SRS system immediately after the battery cables are discon-nected.

The SRS-ECU adopts the rollover specification that the curtain airbag and seat belt pre-tensioner operate at the occurrence of rollover. Therefore, do not tilt the vehicle to the right and left with the IG ON or tilt the SRS-ECU to the right and left with the IG ON and the harness installed.WARNING

Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.

Certain components of this vehicle, such as air bag modules and seat belt pre-tensioners, may contain perchlorate materials. Special handling may apply. For additional information, see www.dtsc.ca.gov/hazardouswaste/perchlorate.

Do not use any electrical test equipment on or near the SRS components, except those specified on P.52B-357.

Never Attempt to Repair the Following Compo-nents: SRS-ECU, Clock Spring, Air Bag Module, Front impact sensor, Side Impact Sensor, Seat Belt with Pre-tensioner, Seat slide sensor, Front seat assembly. If any of these components are diag-nosed as faulty, they should only be replaced, in accordance with the INDIVIDUAL COMPONENT SERVICE procedures in this manual, starting on P.52B-364.

AC300580AB

Insulating tapeBattery

Battery cableTSB Revision

SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-25

Do not attempt to repair the wiring harness con-nectors of the SRS. If any of the connectors are diagnosed as faulty, replace the wiring harness. If the wires are diagnosed as faulty, replace or repair the wiring harness according to the following table.

.

AC905461AE

SRS-ECU connector

SRS-ECU terminal No. Destination of harness Corrective action1, 2 Instrument panel wiring harness

Knee air bag moduleCorrect or replace the instrument panel wiring harness

3, 4 Instrument panel wiring harness Clock spring Driver's air bag module 2nd squib side

Correct or replace the instrument panel wiring harness. Replace the clock spring.

5, 6 Instrument panel wiring harness Clock spring Driver's air bag module 1st squib side

7, 8 Instrument panel wiring harness Passenger's (front) air bag module 1st squib side

Correct or replace the instrument panel wiring harness.

9, 10 Instrument panel wiring harness Passenger's (front) air bag module 2nd squib side

13 Instrument panel wiring harness Air bag OFF indicator light

17, 27 Instrument panel wiring harness Front wiring harness Front impact sensor (LH)

Correct or replace each wiring harness.

18, 28 Instrument panel wiring harness Front wiring harness Front impact sensor (RH)

21 Floor wiring harness ETACS-ECU (fuse No. 18)

Correct or replace the floor wiring harness.

22 Floor wiring harness ETACS-ECU (fuse No. 12)

24 Instrument panel wiring harness Ground

Correct or replace the instrument panel wiring harness.

29, 30 Instrument panel wiring harness CAN bus lineTSB Revision

SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-26

.

WARNING The SRS components and seat belt with pre-ten-

sioner should not be subjected to heat, so remove the SRS-ECU, drivers and front passengers air bag modules, clock spring, knee air bag module, side-airbag modules, Curtain air bag modules, front and side impact sensor and seat belt pre-ten-sioner before drying or baking the vehicle after painting.

SRS-ECU, air bag module, clock spring, impact sensor: 93 C (200 F) or more

Seat belt with pre-tensioner 90C (194 F) or more

After servicing the SRS system, check the warning light operation to make sure that the system func-tions properly. (Refer to P.52B-3).

Make certain that the ignition switch is in the "LOCK"(OFF) position when the scan tool is con-nected or disconnected.

31, 32 Floor wiring harness Front passenger's seat belt pre-tensioner

Correct or replace the floor wiring harness.

33, 38 Floor wiring harness Passengers seat belt switch

36, 37 Floor wiring harness Curtain air bag module (LH)

39, 40 Floor wiring harness Side-airbag module (LH)

41, 42 Floor wiring harness Side impact sensor (LH)

44, 45 Floor wiring harness Side impact sensor (Rear: LH)

53, 58 Floor wiring harness Drivers seat belt switch

54, 55 Floor wiring harness Driver's seat belt pre-tensioner

56, 57 Floor wiring harness Side-airbag module (RH)

59, 60 Floor wiring harness Curtain air bag module (RH)

61, 62 Floor wiring harness Side impact sensor (Rear: RH)

64, 65 Floor wiring harness Side impact sensor (RH)

SRS-ECU terminal No. Destination of harness Corrective actionTSB Revision

SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-27

SRS AIR BAG DIAGNOSISINTRODUCTION TO DIAGNOSIS

M1524005000534The SRS system is controlled by the SRS-ECU. The SRS-ECU judges how severe a collision is by detect-ing signals from the left and right front impact sen-sors and side impact sensors, front air bag analog G-sensor and front air bag safing G-sensor and side-airbag safing G-sensor. If the impact is over a predetermined level, the SRS-ECU sends an ignition signal. At this time, if the safing G-sensor is on, the SRS air bag will inflate. (The passenger's air bag may not inflate according to the occupant detection data from the occupant classification-ECU.) The

SRS warning light in the combination meter alerts a malfunction of the SRS system. If the following symptoms occur even when the vehicle has not been in a collision, there may be a malfunction in the SRS system.

The SRS warning light does not go off within approximately seven seconds after the ignition switch has been turned to the "ON" position.

The SRS warning light does not illuminate when the ignition switch is turned to the "ON" position.

Refer to Post-collision Diagnosis when inspecting and servicing a vehicle that has been in a collision (Refer to P.52B-358).

TROUBLESHOOTING STRATEGYM1524003100933

Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure that you have exhausted all of the possible ways to find a SRS fault.1. Gather information about the problem from the

customer.2. Verify that the condition described by the

customer exists.3. Check the vehicle for any SRS diagnostic trouble

codes (SRS DTC).4. If you cannot verify the condition but there are no

SRS DTCs, the malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting Inspection Service Points How to Cope with Intermittent Malfunctions P.00-15.

5. If there is a SRS DTC, record the code number, then erase the code from vehicle memory using scan tool (M.U.T.-III Sub Assembly) MB991958.

6. Recreate the SRS DTC set conditions to see if the same SRS DTC will be set again.

If the same SRS DTC is set again, follow the Inspection Chart for the DTC and find the fault.

If you cannot get the same SRS DTC to be set again, the malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting Inspection Service Points How to Cope with Intermittent Malfunctions P.00-15.

DIAGNOSTIC FUNCTIONM1524013800223

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824:Vehicle Communication Interface(V.C.I.) MB991827:M.U.T.-III USB Cable MB991910:M.U.T.-III Main Harness ATSB Revision

SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-28

CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before con-necting or disconnecting scan tool MB991958.1. Ensure that the ignition switch is at the "LOCK" (OFF)

position.2. Start up the personal computer.3. Connect special tool MB991827 to special tool MB991824

and the personal computer.4. Connect special tool MB991910 to special tool MB991824.5. Connect special tool MB991910 to the data link connector.6. Turn the power switch of special tool MB991824 to the "ON"

position.NOTE: When special tool MB991824 is energized, special tool MB991824 indicator light will be illuminated in a green color.

7. Start the M.U.T.-III system on the personal computer.NOTE: Disconnecting scan tool MB991958 is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODESRequired Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824:Vehicle Communication Interface(V.C.I.) MB991827:M.U.T.-III USB Cable MB991910:M.U.T.-III Main Harness A

NOTE: If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool MB991958 does not display.1. Connect scan tool MB991958 to the data link connector.2. Turn the ignition switch to the "ON" position.3. Select "System select" from the start-up screen.4. Select "From 2006 MY" of "Model Year." When the "Vehicle

Information" is displayed, check the contents.5. Select "SRS-AIR BAG" from "System List," and press the

"OK" button.NOTE: When the "Loading Option Setup" list is displayed, check the applicable item.

6. Select "Diagnostic Trouble Code" to read the DTC.7. If a DTC is set, it is shown.8. Choose "Erase DTCs" to erase the DTC.

HOW TO DIAGNOSE THE CAN BUS LINESRequired Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

ACA00016MB991827

MB991824MB991910

AB

Data link connectorTSB Revision

MB991824: Vehicles Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable


MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

1. Connect scan tool MB991958 to the data link connector.2. Turn the ignition switch to the "ON" position.3. Select "CAN bus diagnosis" from the start-up screen.4. When the vehicle information is displayed, confirm that it

matches the vehicle being diagnosed. If they match, go to Step 8. If not, go to Step 5.

5. Select the "view vehicle information" button.6. Enter the vehicle information and select the "OK" button.7. When the vehicle information is displayed, confirm again

that it matches the vehicle being diagnosed. If they match, go to Step 8. If not, go to Step 5.

8. Select the "OK" button.9. When the optional equipment screen is displayed, choose

the one which the vehicle is fitted with, and then select the "OK" button.

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the scan tool (GROUP 00, How to Cope with Intermittent Malfunction P.00-15)..

When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing each data from scan tool, the troubleshooting can be performed more effi-ciently. The displayed items are as the table below.DISPLAY ITEM LIST

NOTE: *: If a failure occurs to both the ASC-ECU and ETACS-ECU, 0000 mile or FFFF mile is displayed on the scan tool MB991958.

Item No. Item name Data item Unit01 Odometer Total driving distance after the diagnostic trouble

code is generatedmile*

02 Ignition cycle Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition

Number of counts is displayed.

04 Accumulated minute Cumulative time for current malfunction of diagnostic trouble code

minTSB Revision


SRS WARNING LIGHT CHECKM1524004301353

1. Check that the SRS warning light illuminates when the ignition switch is in the "ON" position.

2. Check that it illuminates for approximately seven seconds and then goes out.

3. If not, check for DTC.

PASSENGER'S SEAT BELT WARNING LIGHT CHECK

M1524026200157When an adult on the front passenger's seat wears the seat belt with the ignition switch "ON," confirm that the passenger's seat belt warning light goes out.The light comes on when a person sits on the front passenger seat but does not fasten the seat belt.

PASSENGER'S AIR BAG OFF INDICATOR LIGHT CHECK

M1524026300262.

SYSTEM CHECKCheck that the passengers air bag OFF indicator light illumi-nates when the ignition switch is in the "ON" position.Check that it illuminates for approximately seven seconds and then goes out.In the following situations, the indicator will stay on to show that the passengers (front) air bag is not operational.

The occupant classification-ECU and weight sensor sense 66 pounds (30 kg) on the front passenger seat.

The front passengers seat is not occupied.

.

AC905530

SRS warning light

AB

ACA03521AB

Passenger's seat belt warning light

AC905531

Passenger's air bag OFF indicator light

ACTSB Revision


ILLUMINATION CHECK1. Remove the instrument panel assembly center.2. Connect the positive battery terminal with the center panel

unit connector terminal No. 12. Then, check if the passengers air bag OFF indicator light is illuminated when the negative battery terminal and the center panel unit connector terminal No. 14 are connected.

3. If the passengers air bag OFF indicator light is illuminated, it is judged good.

ACA00007

Instrument panel assembly center

AD

Center panel unit connectorTSB Revision


CHECK CHART FOR DIAGNOSIS CODESM1524003302416

CAUTIONDuring diagnosis, a DTC code associated with another system may be set when the ignition switch is turned on with connector(s) disconnected. After completing the repair, confirm all systems for DTC code(s). If DTC code(s) are set, erase them all.Inspect according to the inspection chart that is appropriate for the DTC.

Code No. Diagnostic item Reference page

B1400*2 Driver's Air Bag Module (1st squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-38

B1401*2 Driver's Air Bag Module (1st squib) System (Squib Circuit Open)

P.52B-45

B1402*2 Driver's Air Bag Module (1st squib) System (Shorted to Squib Circuit Ground)

P.52B-51

B1403*2 Driver's Air Bag Module (1st squib) System (Shorted to Squib Circuit Power Supply)

P.52B-57

B1404*4 Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1405*4 Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1406*4 Malfunction of G-sensor inside Front Impact Sensor (RH) P.52B-66

B1407*2 Front Impact Sensor (RH) Voltage Error P.52B-68

B1408*2 Front Impact Sensor (RH) Communication Error P.52B-71

B1409*2 Front Impact Sensor (RH) Communication Impossible P.52B-71

B1410*2 Passenger's (Front) Air Bag Module (1st squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-74

B1411*2 Passenger's (Front) Air Bag Module (1st squib) System (Squib Circuit Open)

P.52B-80

B1412*2 Passenger's (Front) Air Bag Module (1st squib) System (Shorted to Squib Circuit Ground)

P.52B-85

B1413*2 Passenger's (Front) Air Bag Module (1st squib) System (Shorted to Squib Circuit Power Supply)

P.52B-90

B1414*4 Passengers (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1415*4 Passengers (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1416*4 Malfunction of G-sensor inside Front Impact Sensor (LH) P.52B-66

B1417*2 Front Impact Sensor (LH) Voltage Error P.52B-96

B1418*2 Front Impact Sensor (LH) Communication Error P.52B-99

B1419*2 Front Impact Sensor (LH) Communication Impossible P.52B-99

B1420*2 Side-airbag Module (RH) (Squib) System (Short Circuit between Squib Circuit Terminals)

P.52B-102

B1421*2 Side-airbag Module (RH) (Squib) System (Squib Circuit Open)

P.52B-107TSB Revision


B1422*2 Side-airbag Module (RH) (Squib) System (Shorted to Squib Circuit Ground)

P.52B-112

B1423*2 Side-airbag Module (RH) (Squib) System (Shorted to Squib Circuit Power Supply)

P.52B-116

B1424*4 Side-airbag Module (RH) (Squib) System Detected Short Circuit

P.52B-63

B1425*4 Side-airbag Module (RH) (Squib) System Detected Open Circuit

P.52B-63

B1426*4 Malfunction of G-sensor Inside Side Impact Sensor (Front: RH)

P.52B-120

B1427*2 Side Impact Sensor (Front: RH) Voltage Error P.52B-122

B1428*2 Side Impact sensor (Front: RH) Communication Error P.52B-124

B1429*2 Side Impact sensor (Front: RH) Communication impossible P.52B-124

B1430*2 Side-airbag Module (LH) (Squib) System (Short Circuit between Squib Circuit Terminals)

P.52B-128

B1431*2 Side-airbag Module (LH) (Squib) System (Squib Circuit Open)

P.52B-133

B1432*2 Side-airbag Module (LH) (Squib) System (Shorted to Squib Circuit Ground)

P.52B-138

B1433*2 Side-airbag Module (LH) (Squib) System (Shorted to Squib Circuit Power Supply)

P.52B-142

B1434*4 Side-airbag Module (LH) (Squib) System Fault 3 for Ignition Drive Circuit

P.52B-63

B1435*4 Side-airbag Module (LH) (Squib) System Fault 4 for Ignition Drive Circuit

P.52B-63

B1436*4 Malfunction of G-sensor Inside Side Impact Sensor (Front: LH)

P.52B-120

B1437*2 Side Impact Sensor (Front: LH) Voltage Error P.52B-146

B1438*2 Side Impact Sensor (Front: LH) Communication Error P.52B-149

B1439*2 Side Impact Sensor (Front: LH) Communication Impossible P.52B-149

B1440*2 Curtain Air Bag Module (RH) (Squib) System (Short Circuit between Squib Circuit Terminals)

P.52B-152

B1441*2 Curtain Air Bag Module (RH) (Squib) System (Squib Circuit Open

P.52B-156

B1442*2 Curtain Air Bag Module (RH) (Squib) System (Shorted to Squib Circuit Ground)

P.52B-161

B1443*2 Curtain Air Bag Module (RH) (Squib) System (Shorted to Squib Circuit Power Supply))

P.52B-165

B1444*4 Curtain Air Bag Module (RH) (Squib) System Detected Short Circuit

P.52B-63

B1445*4 Curtain Air Bag Module (RH) (Squib) System Detected Open Circuit

P.52B-63

*4 Side Impact Sensor (Rear: RH) System for Fault

Code No. Diagnostic item Reference pageTSB Revision

B1446 P.52B-169


B1447*2 Side Impact Sensor (Rear: RH) Power Supply Circuit System

P.52B-171

B1448*2 Side Impact Sensor (Rear: RH) (Squib) for Power Supply Circuit

P.52B-173

B1449*2 Side Impact Sensor (Rear: RH) (Squib) for Communication System

P.52B-173

B1450*2 Curtain Air Bag Module (LH) (Squib) System (Short Circuit between Squib Circuit Terminals)

P.52B-176

B1451*2 Curtain Air Bag Module (LH) (Squib) System (Squib Circuit Open)

P.52B-180

B1452*2 Curtain Air Bag Module (LH) (Squib) System (Shorted to Squib Circuit Ground)

P.52B-185

B1453*2 Curtain Air bag Module (LH) (Squib) System (Shorted to Squib Circuit Power Supply)

P.52B-189

B1454*4 Curtain Air Bag Module (LH) (Squib) System Detected Short Circuit

P.52B-63

B1455*4 Curtain Air Bag Module (LH) (Squib) System Detected Open Circuit

P.52B-63

B1456*4 Side Impact Sensor (Rear: LH) System for Fault P.52B-169

B1457*2 Side Impact Sensor (Rear: LH) Power Supply Circuit System

P.52B-193

B1458*2 Side Impact Sensor (Rear: LH) (Squib) for Power Supply Circuit

P.52B-196

B14592 Side Impact Sensor (Rear: LH) (Squib) for Communication System

P.52B-196

B1466*4 Analog G-Sensor System in the SRS-ECU P.52B-63

B1467*4 Safing G-Sensor Open Circuit P.52B-63

B1468*4 Safing G-Sensor Short Circuit P.52B-63

B1469*4 Safing G-Sensor for Side Air Bag Faults P.52B-63

B1476*3 Open Circuit to IG1 Power Supply (Fuse No.12 Circuit) P.52B-199

B1477*3 Open Circuit to IG1 Power Supply (Fuse No.18 Circuit) P.52B-199

B1478*4 SRS-ECU Capacitor Circuit Voltage too High P.52B-63

B1479*4 SRS-ECU Capacitor Circuit Voltage too Low P.52B-63

B1480*2 Driver's Air Bag Module (2nd squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-38

B1481*2 Driver's Air Bag Module (2nd squib) System (Squib Circuit Open)

P.52B-45

B1482*2 Driver's Air Bag Module (2nd squib) System (Shorted to Squib Circuit Ground)

P.52B-51

B1483*2 Driver's Air Bag Module (2nd squib) System (Shorted to Squib Circuit Power Supply)

P.52B-57

*4 Driver's Air Bag Module (2nd Squib Ignition Drive Circuit)


B1484System Detected Short Circuit

P.52B-63


B1485*4 Driver's Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1488*4 Passengers Air Bag OFF Indicator Light (Short Circuit between Circuit Terminal)

P.52B-204

B1489*2 Passengers Air Bag OFF Indicator Light (Open Circuit) P.52B-207

B1490*2 Passenger's (Front) Air Bag Module (2nd squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-74

B1491*2 Passenger's (Front) Air Bag Module (2nd squib) System (Squib Circuit Open)

P.52B-80

B1492*2 Passenger's (Front) Air Bag Module (2nd squib) System (Shorted to Squib Circuit Ground)

P.52B-85

B1493*2 Passenger's (Front) Air Bag Module (2nd squib) System (Shorted to Squib Circuit Power Supply)

P.52B-90

B1494*4 Passengers (Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1495*4 Passengers (Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1496*4 SRS-ECU Non-Volatile Memory (EEPROM*1) P.52B-63

B1497*4 SRS-ECU Application Specific Integrated Circuit (for frontal activation)

P.52B-63

B1498*4 SRS-ECU ROM or RAM P.52B-63

B1499*4 Air Bag Deployment Determined by SRS-ECU P.52B-210

B1527*2 Seat Belt Switch (Drivers side) Circuit Open P.52B-211

B1528*2 Seat Belt Switch (Drivers side) Circuit (Ground Side) Shorted

P.52B-211

B1537*2 Seat Belt Switch (Passengers side) Circuit Open P.52B-215

B1538*2 Seat Belt Switch (Passengers side) Circuit (Ground Side) Shorted

P.52B-215

B1547*4 Passengers Air Bag Cut Off Activating Circuit P.52B-63

B1556*2 Drivers Seat Slide Sensor Malfunction (Occupant Classification-ECU)

P.52B-219

B1557*4 SRS-ECU Application Specific Integrated Circuit P.52B-63

B1558*2 OCM (Occupant Classification-ECU) DTC Present P.52B-220

B1573*5 Passengers Air Bag Cut Off Switch Circuit (Power Supply side) Shorted

-

B1588*4 SRS-ECU Backup Capacitor System (Up converter unit) P.52B-63

B1589*4 SRS-ECU Backup Capacitor System (Down converter unit) P.52B-63

B1590*4 SRS-ECU Backup Capacitor System (capacitance big) P.52B-63

B1591*4 SRS-ECU Backup Capacitor System (capacitance small) P.52B-63

B1594*4 SRS-ECU Safing G-sensor Malfunction (For Side Collision) P.52B-63



B1603*2 Driver's Seat belt Pre-tensioner (Squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-221

B1604*2 Driver's Seat belt Pre-tensioner (Squib) System (Squib Circuit Open)

P.52B-227

B1605*2 Driver's Seat belt Pre-tensioner (Squib) System (Shorted to Squib Circuit Ground)

P.52B-232

B1606*2 Driver's Seat belt Pre-tensioner (Squib) System (Shorted to Squib Circuit Power Supply))

P.52B-237

B1607*4 Driver's Seat belt Pre-tensioner (Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1608*4 Driver's Seat belt Pre-tensioner (Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1609*2 Front Passenger's Seat belt Pre-tensioner (Squib) System (Short Circuit between Squib Circuit Terminals

P.52B-241

B1C49*2 Front Passenger's Seat belt Pre-tensioner (Squib) System (Squib Circuit Open)

P.52B-246

B1C47*2 Front Passenger's Seat belt Pre-tensioner (squib) system (shorted to squib circuit Ground)

P.52B-251

B1612*2 Front Passenger's Seat belt Pre-tensioner (Squib) System (Shorted to Squib Circuit Power Supply

P.52B-255

B1613*4 Front Passenger's Seat belt Pre-tensioner (Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1614*4 Front Passenger's Seat belt Pre-tensioner (Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1615*4 SRS-ECU Safing G-sensor (for front air bag electronic safing sensor failure)

P.52B-63

B1616*4 SRS-ECU Safing G-sensor (for front air bag electronic safing circuit failure)

P.52B-63

B1617*4 Roll Over Sensor Malfunction P.52B-259

B1618*4 SRS-ECU Safing G-sensor (Z axis low G-sensor failure) P.52B-63

B1631*2 Driver's Knee Air Bag (Squib) System (Short Circuit Between Squib Circuit Terminals)

P.52B-261

B1632*2 Driver's Knee Air Bag (Squib) System (Squib Circuit Open) P.52B-265

B1633*2 Driver's Knee Air Bag (Squib) System (Shorted To Squib Circuit Ground)

P.52B-261

B1634*2 Driver's Knee Air Bag (Squib) System (Shorted To Squib Circuit Power Supply)

P.52B-273

B1635*4 Driver's Knee Air Bag Module (Squib Ignition Drive Circuit) System Detected Short Circuit

P.52B-63

B1636*4 Driver's Knee Air Bag Module (Squib Ignition Drive Circuit) System Detected Open Circuit

P.52B-63

B1699*4 SRS-ECU collective deployment P.52B-277

B2206 Vin error/mismatch P.52B-277


B222C Coding Data not Written P.52B-278


NOTE: .

*1: Electrically Erasable Programmable ROM

*2: This DTC will remain in memory and the SRS warning light will be switched on even if the system returns to normal condition.

*3: This DTC will remain in memory and the SRS warning light will be switched off when the system returns to normal condition.

*4: This DTC cannot be erased by "Erase DTC" function.

*5: This DTC is also set on vehicles without passengers air bag cutoff switch.

B223B Defective Coding Data P.52B-278U0019 Bus Off (CAN-B) P.52B-278U0141 ETACS CAN Timeout P.52B-279U0154 Occupant classification-ECU CAN Timeout P.52B-281U0155 Combination meter CAN Timeout P.52B-282U0164 A/C -ECU CAN Timeout P.52B-284U0168 KOS/WCM CAN Timeout P.52B-285U0184 Audio CAN Timeout P.52B-286U0195 Satellite radio tuner CAN Timeout P.52B-288U0245 MMCS CAN Timeout P.52B-289U1000 OSS CAN Timeout P.52B-290



DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC B1400: Driver's Air Bag Module (1st squib) System (Short Circuit Between Squib Circuit Terminals) DTC B1480: Driver's Air Bag Module (2nd squib) System (Short Circuit Between Squib Circuit Terminals)

ACA02863

SRS-ECU

CLOCKSPRING

Drivers's Air Bag Module (Squib) Circuit

*: CONNECTOR LOCK SWITCH CONNECTOR COUPLED: ON CONNECTOR UNCOUPLED: OFF

NOTE

AB

DRIVER'S AIR BAG MODULE (SQUIB)

C-126 (Y)

Connector: C-126

C-313 (Y)

C-303 (O)

Connectors: C-303, C-313, C-316

C-316 (B)TSB Revision

ACA03077AB ACA03078AB


CAUTION If DTC B1400 or B1480 is set in the SRS-ECU, always diag-nose the CAN bus lines.

When DTC B1400 is set in the following diag-nosis, check the 1st squib circuit. When DTC B1480 is set, check the 2nd squib circuit.

.

CIRCUIT OPERATION The SRS-ECU judges how severe a collision is

by detecting signals from the front impact sensors and the front air bag analog G-sensor. If the impact is over a predetermined level, the SRS-ECU sends an ignition signal. At this time, if the front air bag safing G-sensor is on, the SRS air bag will inflate.

The ignition signal is input to the air bag module via the clock spring to inflate the air bag.

.

DTC SET CONDITIONS This DTC is set if there is abnormal resistance

between the input terminals of the driver's air bag module (squib). The most likely causes for this code to be set are the followings:

Short circuit in drivers air bag module (squib) or harness

Short circuit in the clock spring.

TROUBLESHOOTING HINTS Improper engaged connector or defective short

spring* Short circuit in the clock spring Short circuit between the driver's air bag module

(squib) circuit terminals Damaged connector(s) Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a "short" spring (which prevents the air bag from deploying unintentionally due to static electricity by shorting the positive wire to the ground wire in the squib circuit when the connectors are disconnected). Therefore, if connector C-126, C-303/C-316 or C-313 is damaged or improperly engaged, the short spring may not be released when the connector is con-nected.

DIAGNOSIS

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before con-necting or disconnecting scan tool MB991958.(1) Connect scan tool MB991958. Refer to "How to connect the

scan tool P.52B-27."(2) Turn the ignition switch to the "ON" position.(3) Diagnose the CAN bus line.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis P.54C-16).TSB Revision


STEP 2. Recheck for diagnostic trouble code.Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is the DTC set?

YES : Go to Step 3. NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction P.00-15).

STEP 3. Check SRS-ECU connector C-126, drivers air bag module connector C-303/C-316 and clock spring connector C-313.(1) Disconnect the negative battery terminal.(2) While pushing the part "A" indicated in the figure of the

harness side connector, turn the lock lever to the direction of the arrow to release the lock lever. After disconnecting the C-126 SRS-ECU connector, connect it again.

(3) After disconnecting C-313 clock spring, connect it again.

(4) Disconnect the C-303/C-316 driver's air bag module connector using the flat-tipped screwdriver to pull out the locking button to the direction of the arrow, and connect it again.

(5) Connect the negative battery terminal.(6) Erase the diagnostic trouble code memory, and check the

diagnostic trouble code.Q: Is DTC B1400 or B1480 set?

YES : Go to Step 4.NO : The procedure is complete. It is assumed that DTC

B1400 or B1480 set because connector C-126, C-303/C-316 or C-313 was engaged improperly.

AC905015

A

ACLock lever

ACA03543AB

Driver's air bag module harness side connector

Locking button

Flat-tippedscrewdriverTSB Revision


STEP 4. Check the driver's air bag module.(1) Disconnect the negative battery terminal.(2) Use the flat-tipped screwdriver to pull out the locking button

of wiring harness side connector, and release the lock.

(3) Connect special tool MB991865 to special tool MB991866.CAUTION

Do not insert a probe into the terminal from its front side directly as the connector contact pressure may be weak-ened.(4) Insert the resistor harness probe (special tool) as shown.(5) Connect the negative battery terminal.

CAUTIONAlways DTC B1481 is set when checking DTC B1400. This is because the second side terminal is isolated when checking it. DTC B1481 is set but this is not a fault. In addi-tion, always DTC B1402 is set when checking DTC B1480 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the

diagnostic trouble code.Q: Is the checked DTC set?

YES : Go to Step 5.NO : Replace the driver's air bag module. (Refer to

P.52B-375). Then go to Step 8.

ACA03543AB


Locking button

Flat-tippedscrewdriver

ACA03054AB

MB991865 (Dummy resistor: 3 )

MB991866 (Resistor harness)

C-303/C-316 Air bag module connectorTSB Revision


STEP 5. Check the clock spring.(1) Disconnect the negative battery terminal.(2) Disconnect the clock spring connector C-313.(3) Connect special tool dummy resistor (MB991865) to special

tool resistor harness (MB991866).CAUTION

Do not insert a probe into the terminal from C-313 harness side connector front side directly, as the connector contact pressure may be weakened.(4) Insert the resistor harness probe from the back of C-313

harness side connector (terminal No.3 and 4 or (terminal No.1 and 2 ).

(5) Connect the negative battery terminal.CAUTION

Always DTC B1481 is set when checking DTC B1400. This is because the second side terminal is isolated when checking it. DTC B1481 is set but this is not a fault. In addi-tion, always DTC B1401 is set when checking DTC B1480 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the


YES : Go to Step 6.NO : Replace the clock spring. (Refer to P.52B-375). Then

go to Step 8.

ACA03067


Clock springconnector


ABTSB Revision


STEP 6. Check the drivers air bag module circuit. Measure the resistance at SRS-ECU connector C-126.(1) Disconnect the negative battery terminal.(2) While pushing the part "A" indicated in the figure of the

harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the C-126 SRS-ECU connector.

DANGERTo prevent the air bag from deploying unintentionally, disconnect clock spring connector C-313 to short the squib circuit.(3) Disconnect clock spring connector C-313.

CAUTIONInsert an insulator such as a cable tie to a depth of 4mm (0.16 inch) or more, otherwise the short spring will not be released.(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)

thick] between terminals 5, 6 or 3, 4 and the short spring to release the short spring.

AC905015

A

ACLock lever

AC905150AG

A

A

C-126 Harness sideconnector (front view)

SectionA - A

Cable tie

Short spring4 mm or more

Terminal

AC905150AH

A

A


SectionA - A

Cable tie


Terminal

TSB Revision


(5) Check for continuity between C-126 harness side connector terminals 5 and 6 or 3 and 4 .It should be open circuit.

Q: Is it open circuit? YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1400 or B1480 set, replace the SRS-ECU. (Refer to P.52B-371). Go to Step 8.

NO : Go to Step 7.

STEP 7. Check the harness for short circuit between the harness wire and wire.

SRS-ECU connector C-126 (terminal No.5 and 6) and clock spring connector C-313 (terminal No.3 and 4) .


Q: the check result normal?YES : Go to Step 8.NO : Repair the harness wires between SRS-ECU

connector C-126 and clock spring connector C-313. Then go to Step 8.

STEP 8. Recheck for diagnostic trouble code.Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is DTC B1400 or B1480 set?

YES : Return to Step 1.NO : The procedure is complete.

ACA02867

C-126 Harness side connector (front view)

AB

ACA02867


ACTSB Revision


DTC B1401: Driver's Air Bag Module (1st squib) System (Squib Circuit Open) DTC B1481: Driver's Air Bag Module (2nd squib) System (Squib Circuit Open)

CAUTION If DTC B1401 or B1481 is set in the SRS-ECU, always diag-nose the CAN main bus line.

nosis, check the 1st squib circuit. When DTC B1481 is set, check the 2nd squib circuit.

.

ACA02863

SRS-ECU

CLOCKSPRING



NOTE

AB


ACA03077

C-126 (Y)

AB

Connector: C-126

ACA03078C-313 (Y)

C-303 (O)


AB


When DTC B1401 is set in the following diag-





.

DTC SET CONDITIONS This DTC is set if there is abnormal resistance

between the input terminals of the driver's air bag module (squib). The most likely causes for this code to be set are the followings:

Open circuit in the driver's air bag module (squib) or harness

Open circuit in the clock spring Malfunction of connector contact

.

TROUBLESHOOTING HINTS Open circuit in the clock spring Open circuit due to improper neutral position of

the clock spring Open circuit in the driver's air bag module (squib)

circuit Disengaged driver's air bag module (squib) con-

nector Improper connector contact Malfunction of the SRS-ECU

DIAGNOSIS





Diagnosis P.54C-16).

STEP 2. Recheck for diagnostic trouble code.Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is the DTC set?

YES : Go to Step 3.NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction P.00-15).TSB Revision



of wiring harness side connector, and release the lock.(3) Connect special tool MB991865 to special tool MB991866.

CAUTIONDo not insert a test probe into the terminal from its front side directly, as the connector contact pressure may be weakened.

(4) Insert the resistor harness probe (special tool) as shown.(5) Connect the negative battery terminal.



YES : Go to Step 4.NO : Replace the driver's air bag module. (Refer to


ACA03543AB


Locking button


ACA03054AB





STEP 4. Check the clock spring.(1) Disconnect the negative battery terminal.(2) Disconnect the clock spring connector C-313.(3) Connect special tool MB991865 to special tool MB991866.

CAUTIONDo not insert a probe into the terminal from its front side directly, as the connector contact pressure may be weak-ened.(4) Insert the resistor harness probe from the back of C-313

harness side connector (terminal No.3 and 4 or terminal No.1 and 2 ).


Always DTC B1481 is set when checking DTC B1401. This is because the second side terminal is isolated when checking it. DTC B1481 is set but this is not a fault. In addi-tion, always DTC B1401 is set when checking DTC B1481 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the



go to Step 6.

ACA03067




ABTSB Revision


STEP 5. Check the harness for open circuit between the SRS-ECU connector C-126 and the clock spring connector C-313.(1) Disconnect the negative battery terminal.(2) While pushing the part "A" indicated in the figure of the


DANGERTo prevent the air bag from deploying unintentionally, disconnect the clock spring connector C-313 to short the squib circuit.



AC905015

A

ACLock lever

AC905150AG

A

A


SectionA - A

Cable tie


Terminal

AC905150AH

A

A


SectionA - A

Cable tie


Terminal

TSB Revision


CAUTIONDo not insert a probe into the terminal from C-313 harness side connector front side directly, as the connector contact pressure may be weakened.(4) Check for continuity between the following terminals. It

should be less than 2 ohms.

SRS-ECU connector C-126 (terminal No.5) and the

clock spring connector C-313 (terminal No.3) SRS-ECU connector C-126 (terminal No.6) and the

clock spring connector C-313 (terminal No.4)

SRS-ECU connector C-126 (terminal No.3) and the

clock spring connector C-313 (terminal No.1) SRS-ECU connector C-126 (terminal No.4) and the

clock spring connector C-313 (terminal No.2)Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1401 or B1481 set, replace the SRS-ECU. (Refer to P.52B-371). Then go to Step 6.

NO : Repair the harness wires between SRS-ECU connector C-126 and clock spring connector C-313 Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is DTC B1401 or B1481 set?


ACA02867

C-313 Harness sideconnector (rear view)


AD

ACA02867

C-313 Harness sideconnector (rear view)


AETSB Revision


DTC B1402: Driver's Air Bag Module (1st Squib) System (Shorted to Squib Circuit Ground) DTC B1482: Driver's Air Bag Module (2nd Squib) System (Shorted to Squib Circuit Ground)



.

ACA02863

SRS-ECU

CLOCKSPRING



NOTE

AB


ACA03077

C-126 (Y)

AB

Connector: C-126

ACA03078C-313 (Y)

C-303 (O)


AB






The ignition signal is sent to the air bag module via the clock spring to inflate the air bag.

.

DTC SET CONDITIONSThis DTC is set if there is abnormal resistance between the input terminals of the driver's air bag module (squib)..

TROUBLESHOOTING HINTS Malfunction of the clock spring Damaged harness wires and connectors Short to the ground in the driver's air bag module

(squib) harness Malfunction of the SRS-ECU

DIAGNOSIS












CAUTIONDo not insert a probe into the terminal from its front side directly, as the connector contact pressure may be weak-ened.


CAUTIONAlways DTC B1481 is set when checking DTC B1402. This is because the second side terminal is isolated when checking it, DTC B1481 is set but this is not a fault. In addi-tion, always DTC B1401 is set when checking DTC B1482 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the


YES : Go to Step 4.NO : Replace the driver's air bag module (Refer to


ACA03543AB


Locking button


ACA03054AB






CAUTIONDo not insert a test probe into the terminal from its front side directly, as the connector contact pressure may be weakened.(4) Insert the resistor harness probe from the back of C-313

harness side connector (terminal No.3 and 4 or (terminal No.1 and 2 ).


Always DTC B1481 is set when checking DTC B1402. This is because the second side terminal is isolated when checking it, DTC B1481 is set but this is not a fault. In addi-tion, always DTC B1401 is set when checking DTC B1482 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the



go to Step 7.

ACA03067




ABTSB Revision


STEP 5. Check the drivers air bag module circuit. Measure the resistance at the SRS-ECU connector C-126.(1) While pushing the part "A" indicated in the figure of the


DANGERTo prevent the air bag from deploying unintentionally, disconnect the clock spring connector C-313 to short the squib circuit.(2) Disconnect the clock spring connector C-313.



AC905015

A

ACLock lever

AC905150AG

A

A


SectionA - A

Cable tie


Terminal

AC905150AH

A

A


SectionA - A

Cable tie


Terminal

TSB Revision


(4) Check for continuity between C-126 harness side connector terminals 5 and 6 or 3 and 4 and body ground.It should be open circuit.

Q: Is it open circuit?YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1402 or B1482 sets, replace the SRS-ECU (Refer to P.52B-371). Go to Step 7.

NO : Go to Step 6.

STEP 6. Check the harness for short circuit to ground between the following connector.



Q: Is the check result normal?YES : Go to Step 7.NO : Repair the harness wires between SRS-ECU


STEP 7. Recheck for diagnostic trouble code. Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is DTC B1402 or B1482 set?


ACA02867


AF

ACA02867


AGTSB Revision


DTC B1403: Driver's Air bag Module (1st squib) System (Shorted to Squib Circuit Power Supply) DTC B1483: Driver's Air bag Module (2nd squib) System (Shorted to Squib Circuit Power Supply



.

ACA02863

SRS-ECU

CLOCKSPRING



NOTE

AB


ACA03077

C-126 (Y)

AB

Connector: C-126

ACA03078C-313 (Y)

C-303 (O)


AB







.

DTC SET CONDITIONSThis DTC is set if there is abnormal resistance between the input terminals of the driver's air bag module (squib)..

TROUBLESHOOTING HINTS Malfunction of the clock spring Damaged harness wires and connectors Short to the power supply in the driver's air bag

module (squib) harness Malfunction of the SRS-ECU

DIAGNOSIS












CAUTIONDo not insert a probe into the terminal from its front side directly, as the connector contact pressure may be weak-ened.




YES : Go to Step 4.NO : Replace the drivers air bag module. (Refer to


ACA03543AB


Locking button


ACA03054AB






CAUTIONDo not insert a test probe into the terminal from its front side directly, as the connector contact pressure may be weakened.(4) Insert the resistor harness probe from the back of C-313

harness side connector terminals Nos. 3 and 4 or terminal No. 2 and 1 ).


Always DTC B1B06 is set when checking DTC B1403. This is because the second side terminal is isolated when checking it. DTC B1B06 is set but this is not a fault. In addition, always DTC B1B02 is set when checking DTC B1483 because the first side terminal is isolated. (6) Erase the diagnostic trouble code memory, and check the


YES : Go to Step 5.NO : Replace the clock spring (Refer to P.52B-375). Then

go to Step 7.

ACA03067




ABTSB Revision


STEP 5. Check the drivers air bag module circuit. Measure the voltage at the SRS-ECU connector C-126.(1) Disconnect the negative battery terminal.(2) While pushing the part "A" indicated in the figure of the


DANGERTo prevent the air bag from deploying unintentionally, disconnect the clock spring connector C-313 to short the squib circuit.(3) Disconnect the clock spring connector C-313.



(5) Connect the negative battery terminal.(6) Ignition switch: ON.

AC905015

A

ACLock lever

AC905150AG

A

A


SectionA - A

Cable tie


Terminal

AC905150AH

A

A


SectionA - A

Cable tie


Terminal

TSB Revision


(7) Measure the voltage between C-126 harness side connector terminals 5 and 6 or 3 and 4 and body ground.Voltage should measure 1 volt or less.

Q: Is the measured voltage within the specified range?YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1403 or B1483 sets, replace the SRS-ECU. (Refer to P.52B-371). Then go to Step 7.

NO : Go to Step 6.

STEP 6. Check the harness for short circuit to power supply between the following connector.



Q: Is the check result normal?YES : Go to Step 7.NO : Repair the harness wires between SRS-ECU


STEP 7. Recheck for diagnostic trouble code. Check again if the DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the "ON" position.(3) Check if the DTC is set.(4) Turn the ignition switch to the "LOCK" (OFF) position.Q: Is DTC B1403 or B1483 set?


ACA02874


AB

ACA02874


AC

TSB Revision


DTC B1404: Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Short Circuit DTC B1405: Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Open Circuit DTC B1414: Passengers (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Short Circuit DTC B1415: Passengers (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Open Circuit DTC B1424: Side-Airbag Module (RH) (Squib) System Detected Short Circuit DTC B1425: Side-Airbag Module (RH) (Squib) System Detected Open Circuit DTC B1434: Side-Airbag Module (LH) (Squib) System Fault 3 for Ignition Drive Circuit DTC B1435: Side-Airbag Module (LH) (Squib) System Fault 4 for Ignition Drive Circuit DTC B1444: Curtain Air Bag Module (RH) (Squib) System Detected Short Circuit DTC B1445: Curtain Air Bag Module(RH) (Squib) System Detected Open Circuit DTC B1454: Curtain Air Bag Module (LH) (Squib) System Detected Short Circuit DTC B1455: Curtain Air Bag Module(LH) (Squib) System Detected Open Circuit DTC B1466: Analog G-Sensor System in the SRS-ECU DTC B1467: Safing G-Sensor Open Circuit DTC B1468: Safing G-Sensor Short Circuit DTC B1469: Safing G-Sensor for Side Air Bag Faults DTC B1478: SRS-ECU Capacitor Circuit Voltage too High DTC B1479: SRS-ECU Capacitor Circuit Voltage too Low DTC B1484: Driver's Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Short Circuit DTC B1485: Driver's Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Open Circuit DTC B1494: Passengers (Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Short Circuit DTC B1495: Passengers (Front) Air Bag Module (2nd Squib

Documents

Airbag