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DIAGNOSIS AND TESTING - POWER LIFTGATE SYSTEM
In order to obtain conclusive testing of the power liftgate system, the Controller Area Network (CAN) data bus, and all of the electronic modules that provide inputs to, or receive outputs from the power liftgate system components must be checked. Any diagnosis of the power liftgate system should begin with, the use of a scan tool and the appropriate diagnostic service information.
Refer to the appropriate wiring information for complete circuit schematic or connector pin-out information.
NOTE:Before any testing of the power liftgate system is attempted, the battery should be fully-charged.
SYMPTOM DRIVEN POWER LIFTGATE SYSTEM DIAG
Following are quick reference diagnostic tables to help when diagnosing and testing the power liftgate system.
SYMPTOM DRIVEN POWER LIFTGATE SYSTEM DIAGNOSIS TABLE
CONDITION POSSIBLE
CAUSES
CORRECTION
LIFTGATE WILL NOT INITIATE POWER OPEN/POWER CLOSE WITH EITHER KEY FOB OR OVERHEAD CONSOLE SWITCH
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Binding or sticking of components
Establish location of binding and repair components if necessary
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
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CONDITION POSSIBLE
CAUSES
CORRECTION
Failure of latch assembly
Check for foreign matter or damaged components preventing the operation of latch assembly
Check for diagnostic trouble codes and cycle with scan tool, replace latch if necessary
Failure of power liftgate drive unit
Check for diagnostic trouble codes and cycle with scan tool, replace power liftgate drive unit if necessary
KEY FOB DOES NOT OPERATE POWER LIFTGATE (BUT OVERHEAD CONSOLE SWITCH DOES)
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Key in ignition Key fob buttons do not function when key is ignition
Failure of key fob Reprogram key fob, replace if necessary
Failure of Wireless Ignition Node (WIN)
Check for diagnostic trouble codes and cycle liftgate with scan tool, replace inoperative module as necessary
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Controller Area Network (CAN) Data Bus issue
Refer to 8 – ELECTRICAL/ELECTRONIC CONTROL MODULES – ELECTRICAL DIAGNOSTICS
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CONDITION POSSIBLE
CAUSES
CORRECTION
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
OVERHEAD CONSOLE SWITCH DOES NOT OPERATE POWER LIFTGATE (BUT KEY FOB DOES)
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Failure of overhead console switch
(Refer to 08 - Electrical/Power Sliding Door/Description) .
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
LATCH WILL NOT RELEASE WITH OUTSIDE HANDLE (POWER-OPEN CYCLE MAY OR MAY NOT INITIATE)
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Failure of outside handle/linkage
(Refer to 23 - Body/Decklid/Hatch/Liftgate/Tailgate/HANDLE, Exterior/Removal)
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CONDITION POSSIBLE
CAUSES
CORRECTION
Failure of outside handle switch
Check for diagnostic trouble codes and cycle with scan tool, repair as required
Failure of latch assembly
Check for foreign matter or damaged components preventing the operation of latch assembly
Check for diagnostic trouble codes and cycle with scan tool, replace latch if necessary
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Binding or sticking of components
Establish location of binding and replace necessary components
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
LIFTGATE REVERSES DIRECTION DURING POWER OPEN/POWER CLOSE CYCLE
Key fob button being hit more than the two times required, or overhead console switch being hit more than once Extra presses may cause the liftgate to reverse direction
Key fob button being hit more than the two times required, or overhead console switch being hit more than once Extra presses may cause the liftgate to reverse direction
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Binding or sticking of components
Establish location of binding and replace necessary components
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CONDITION POSSIBLE
CAUSES
CORRECTION
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Failure of power liftgate drive unit
Check for diagnostic trouble codes and cycle with scan tool, replace power liftgate drive unit if necessary
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
LATCH WILL NOT POWER-CINCH TO PRIMARY POSITION (DURING MANUAL AND/OR POWER OPERATION)
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Pinch sensor activated or open/short circuit
Check pinch sensor status with scan tool. Repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Binding or sticking of components
Establish location of binding and replace necessary components
Door seal force too high
Inspect seals for damage, improper installation, foreign matter or other possible obstruction. Repair as required
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Failure of latch assembly
Check for foreign matter or damaged components preventing the operation of latch assembly
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CONDITION POSSIBLE
CAUSES
CORRECTION
Check for diagnostic trouble codes and cycle with scan tool, replace latch if necessary
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
LIFTGATE DOES NOT STAY OPEN AFTER COMPLETION OF POWER-OPEN CYCLE AND/OR MANUAL OPENING
Failure of liftgate strut-supports (prop rods)
Check for broken attachments
Replace prop rods
HIGH OPENING EFFORT/LIFTGATE OPENS VERY SLOWLY DURING MANUAL AND/OR POWER OPERATION
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool repair as required.
Failure of liftgate strut-supports (prop rods)
Check for broken attachments
Replace prop rods
Binding or sticking of components
Establish location of binding and replace necessary components
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Grade of vehicle too steep for power operation
Operate liftgate manually
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CONDITION POSSIBLE
CAUSES
CORRECTION
Failure of power liftgate drive unit
Check for diagnostic trouble codes and cycle with scan tool, replace power liftgate drive unit if necessary
LIFTGATE CONTINUES TO POWER-CLOSE AFTER REACHING FULL-CLOSED POSITION
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Binding or sticking of components
Establish location of binding and replace necessary components
Failure of latch assembly
Check for foreign matter or damaged components preventing the operation of latch assembly
Check for diagnostic trouble codes and cycle with scan tool, replace latch if necessary
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
LIFTGATE CONTINUES TO POWER-OPEN AFTER REACHING FULL-OPEN POSITION (MAY PULSE SEVERAL TIMES)
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
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CONDITION POSSIBLE
CAUSES
CORRECTION
Failure of full open switch
Check switch status with scan tool, replace switch if necessary
Failure of power liftgate drive unit
Check for diagnostic trouble codes and cycle with scan tool, replace power liftgate drive unit if necessary
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
SQUEAKS, NOISES AND RATTLES
Foreign material inside liftgate panel
Remove foreign material
Worn/loose components
Check and tighten/replace loose components
LIFTGATE UNLATCHES OR INITIATES POWER OPEN/POWER CLOSE CYCLE UNEXPECTEDLY
Accidental activation Use scan tool to check/record PLGM activation history
Power Liftgate System Inhibitors preventing operation
Check Inhibit Monitors with scan tool, repair as required.
Power Liftgate Input/Output status incorrect
Check power liftgate input - output status with scan tool, repair as required
Wiring problems (system or vehicle)
Troubleshoot using the appropriate wiring diagrams information, refer to wiring diagrams
Failure of key fob button or overhead console switch
Check for shorted or defective switch
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CONDITION POSSIBLE
CAUSES
CORRECTION
Failure of latch assembly
Check for foreign matter or damaged components preventing the operation of latch assembly
Check for diagnostic trouble codes and cycle with scan tool, replace latch if necessary
Power Liftgate Control Module
Check for diagnostic trouble codes and cycle with scan tool, replace module if necessary
POWER LIFTGATE SYSTEM CONTROL PARAMETERS
The power liftgate system is designed with a number of control parameters, which are conditions that must be fulfilled to allow operation. These control parameters are listed below:
• The Power Liftgate module will inhibit operation of the power liftgate in extreme temperatures. These temperatures will be approximately -22° F (-30° C) and 149° F (65° C). The pinch sensor/thermistor assembly on the right side of the liftgate monitors the temperature.
• The vehicle's transmission must be in park or neutral for the power liftgate to operate. • The vehicle's speed must be zero for the power liftgate to operate. • The vehicle's electrical system voltage must be within specification for the power liftgate system to
operate. A low-voltage cut-off is built into the power liftgate system to prevent the vehicle's battery from discharging to the point were the vehicle cannot be operated.
• If the vehicle's ignition switch is in the “START” position, the power liftgate system will not initiate a power cycle.
• If the vehicle's ignition switch is moved to the “START” position during a power cycle, the power liftgate will pause.
• If the vehicle is locked, the outside handle will not release the latch. The key fob and overhead switch will work for power open or close cycles.
• If the vehicle’s theft alarm is armed, the overhead switch will not open the liftgate; however the key fob will work.
• If a liftgate pinch sensor is activated during a power close, the liftgate will reverse direction. If a pinch sensor is already active the power liftgate will not initiate a power close. A pinch activation during latch cinch will stop the cinch operation.
• If something sufficiently impedes liftgate travel, the power liftgate will detect an obstacle and reverse direction, traveling to full open or closed.
• If multiple obstacles are detected during the same power open or close cycle, the liftgate will abort that power cycle and go into full manual operation.
• The power liftgate components are protected by the power liftgate fuse. If the fuse is blown, the power liftgate will not function (Refer to 04 - Vehicle Quick Reference/Fuse Locations and Types/Specifications) .
• If severe Diagnostic Trouble Codes (DTC's) are stored in the power liftgate control module the system may not operate. If power liftgate DTC's are present, refer to 8 - ELECTRICAL/POWER SYSTEMS/POWER LIFTGATE/ ELECTRICAL DIAGNOSTICS - DIAGNOSIS AND TESTING.
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POWER LIFTGATE INPUT - OUTPUT TABLE
NORMAL READINGS
INPUTFULLY CLOSED AND LATCHED
FULLY OPEN
BETWEEN FULLY
OPEN AND CLOSED
DESCRIPTION
PRIMARY RATCHET/AJAR SWITCH CLOSED
FALSE TRUE TRUE
Primary/Ajar switch, internal to the liftgate latch. Open when latch is in primary; Closed when latch is out of primary.
SECONDARY RATCHET SWITCH CLOSED
FALSE TRUE TRUE
Internal to the liftgate latch. Indicates when the latch is in secondary position. Open when in secondary position; Closed when out of secondary position.
PAWL SWITCH CLOSED
FALSE TRUE TRUE
Internal to the liftgate latch. Indicates when the latch pawl has secured the latch in primary or secondary position. Goes Open when entering secondary latch; Closed when out of secondary and primary.
SECTOR GEAR SWITCH CLOSED
FALSE FALSE FALSE
Internal to the liftgate latch. Essentially a park switch for the latch. When latch is running a cinch or release, this switch is closed. After cinch or release is complete, the Power Liftgate Module will reverse direction of the latch until the switch is Open.
FULL OPEN SWITCH CLOSED
FALSE TRUE FALSE Internal to the drive motor. Indicates when the liftgate is a few degrees from full
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NORMAL READINGS
open. Closed when full open; Open otherwise.
POSITION SENSOR NUMBER 1 AND NUMBER 2 CLOSED
FALSE OR TRUE FALSE OR TRUE
FALSE OR TRUE
When in motion, these signals will toggle between Open and Closed. The two signals together tell the Power Liftgate Module the speed and direction of liftgate travel. They are also used to sense obstacles encountered by the liftgate.
POSITION SENSOR NUMBER 1 PULSE COUNTS
0 180 - 200 0 to 200
This is a counter derived from the pulses coming from Position Sensors number 1 and 2. This count represents total travel of the liftgate (to mechanical end of travel).
GATE POSITION COUNTS
0 165 - 185 0 to 185
This is a counter derived from the pulses coming from Position Sensors number 1 and 2. This count represents the position of the full open switch in the liftgate drive unit.
INPUTNORMAL/NOT
PRESSEDPRESSED DESCRIPTION
LEFT PINCH SENSOR
Approximately 2.5V (10K ohms)
Less than 1V
Pinch sensor reads 10K ohms when not pinched. When pinched, shorts out the 10K ohm resistor and should read from 0 to approximately 200 ohms.
RIGHT PINCH SENSOR
Approximately 1.7V at 70°F
Less than 1V Right pinch sensor has a 10K at room temperature thermistor in place of the resistor. When not pinched, resistance is proportional to the ambient temperature. When pinched, shorts out the thermistor
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NORMAL READINGS
and should read from 0 to approximately 200 ohms.
HANDLE SWITCH 5V (normally open) Approximately 2.2V (4.7K ohms pressed)
Located in the liftgate latch. Open circuit when not active. 4.7K ohms to ground when handle is activated.
OVERHEAD SWITCH
Approximately 4.7V Approximately 2.2V
When not pressed, should read about 810K ohms. When pressed, should read about 4.7K ohms.
D-PILLAR/REAR ZONE SWITCH (IF EQUIPPED)
Approximately 4.7V Approximately 2.2V
When not pressed, should read about 810K ohms. When pressed, should read about 4.7K ohms.
OUTPUT DESCRIPTION DIAGNOSE
HALL EFFECT POWER
Provides +5V to the hall sensor in drive motor
As long as module is awake it should read approximately +5V.
LATCH MOTOR Provides +/- 12V to latch motor for cinch and release
Actuate with scan tool. Should see positive voltage on the cinch wiring connector terminal for cinch direction. Should see positive voltage on the release wiring connector terminal for release direction. Refer to the appropriate wiring diagrams for specific wiring harness and connector pinout information.
DRIVE CLUTCH
Provides + 12V to clutch in power liftgate drive unit to engage drive mechanism for power open or close
Actuate with scan tool. Should see approximately 12V output.
DRIVE MOTOR Provides +/- 12V to power liftgate drive unit motor for power open or close
Actuate with scan tool. Should see positive voltage on the open wiring connector terminal for open direction. Should see positive voltage on the close wiring connector terminal for close direction. Refer to the appropriate wiring diagrams for specific wiring harness and connector pinout information.
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NORMAL READINGS
CHIME Provides 2000Hz signal to output sound
Actuate with scan tool. While monitoring with a digital multimeter some activity should be present; not much voltage.
POWER LIFTGATE SYSTEM INHIBIT MONITORS
The following is a list of inhibit monitors as observed by an appropriate scan tool.
POWER LIFTGATE SYSTEM INHIBIT MONITORS TABLE
INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
$80 OPEN INHIBIT - VOLTAGE TOO LOW
Low or dead battery Charge or replace battery
$82 CLOSE INHIBIT - VOLTAGE TOO LOW
Power or ground to the power liftgate module
Check power/ground circuits and repair as necessary
Inaccurate voltage reading from the power liftgate module
Compare the power liftgate module battery reading through the scan tool with a voltmeter reading at the power liftgate module power/ground connections. If a voltage difference of 0.5V or greater is present replace the power liftgate module
$81 OPEN INHIBIT - VOLTAGE TOO HIGH
Charging system over voltage concern
Diagnose charging system and repair as necessary
$83 CLOSE INHIBIT - VOLTAGE TOO HIGH
Inaccurate voltage reading from the power liftgate module
Compare the power liftgate module battery reading through the scan tool with a voltmeter reading at the power liftgate module power/ground connections. If a voltage difference of 0.5V or greater is present replace the power liftgate module
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
$84 OPEN INHIBIT - TEMPERATURE TOO LOW
Temperature was below -30°C (-22°F) when the operation was attempted
Inform customer of temperature operating range
$86 CLOSE INHIBIT - TEMPERATURE TOO LOW
High resistance to right pinch sensor/thermistor circuit signal or ground
Check signal/ground circuits (including in-line connectors) and repair as necessary
Inoperative right pinch sensor/thermistor
Allow vehicle to sit in a constant temperature environment for one hour with the liftgate open. Measure the resistance of the right pinch sensor/thermistor and compare the values with those in the pinch sensor section, (Refer to 08 - Electrical/Power Liftgate/SENSOR, Pinch/Operation) . If the resistance is out of range, replace the right pinch sensor/thermistor
Inaccurate temperature reading from the power liftgate control module
Allow vehicle to sit in a constant temperature environment for one hour with the liftgate open. Check the power liftgate control module temperature reading using a scan tool. If the reading is greater than 4.5°C (8°F) off, measure the resistance of the right pinch sensor/thermistor and compare the values with those in the pinch sensor section, (Refer to 08 - Electrical/Power Liftgate/SENSOR, Pinch/Operation) . If the right pinch sensor/thermistor resistance is OK, replace the power liftgate control module
$85 OPEN INHIBIT - TEMPERATURE TOO HIGH
Temperature was above 65°C (149°F) when the operation was attempted
Inform customer of temperature operating range
$87 CLOSE INHIBIT - TEMPERATURE TOO HIGH
Short or partial short to ground to right pinch sensor/thermistor circuit signal
Check signal circuit and repair as necessary
Inoperative right pinch sensor/thermistor
Allow vehicle to sit in a constant temperature environment for one hour with the liftgate open. Measure the resistance of the right pinch sensor/thermistor and compare the values with those in the pinch sensor section, (Refer to 08 - Electrical/Power Liftgate/SENSOR, Pinch/Operation) .
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
If the resistance is out of range, replace the right pinch sensor/thermistor
Inaccurate temperature reading from the power liftgate control module
Allow vehicle to sit in a constant temperature environment for one hour with the liftgate open. Check the power liftgate control module temperature reading using a scan tool. If the reading is greater than 4.5°C (8°F) off, measure the resistance of the right pinch sensor/thermistor and compare the values with those in the pinch sensor section, (Refer to 08 - Electrical/Power Liftgate/SENSOR, Pinch/Operation) . If the right pinch sensor/thermistor resistance is OK, replace the power liftgate control module
$88 CLOSE INHIBIT - LEFT PINCH SENSOR ACTIVE
Pinch was activated prior to activation of power close cycle
Inform customer of pinch sensor operation
Check for obstructions causing pinch sensor activation. Repair as necessary
Short to ground on left pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative left pinch sensor
Measure the resistance of the left pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the left pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the left pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$89 CLOSE INHIBIT - RIGHT PINCH SENSOR ACTIVE
Pinch was activated prior to activation of power close cycle
Inform customer of pinch sensor operation
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Check for obstructions causing pinch sensor activation. Repair as necessary
Short to ground on right pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative right pinch sensor
Measure the resistance of the right pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the right pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the right pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$8A OPEN INHIBIT - NOT IN PARK/NEUTRAL
Operator attempted “power open” when vehicle was not in Park/Neutral
Inform customer of operating restrictions
Operator attempted manual latch release with exterior handle when vehicle was not in Park/Neutral
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Transmission range sensor problem
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify PRNDL status reads correctly. If NOT OK, verify proper operation of the transmission range sensor, repair as necessary.
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fobik and keyless entry system. Repair as necessary
Liftgate release switch
Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is correct under different voltage and driving conditions. Repair as necessary
$8B CLOSE INHIBIT - NOT IN PARK/NEUTRAL
Operator attempted “power close” when vehicle was not in Park/Neutral
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Transmission range sensor problem
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify PRNDL status reads correctly. If NOT OK, verify proper operation of the transmission range sensor, repair as necessary.
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fob and keyless entry system. Repair as necessary
$8C OPEN INHIBIT - NON-ZERO VEHICLE SPEED
Operator attempted “power open” when vehicle is in Neutral and rolling
Inform customer of operating restrictions
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Operator attempted manual latch release with exterior handle when vehicle was not in Park/Neutral
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Vehicle speed sensor
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fob and keyless entry system. Repair as necessary
Liftgate release switch
Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is correct under different voltage and driving conditions. Repair as necessary
$8D CLOSE INHIBIT - NON-ZERO VEHICLE SPEED
Operator attempted “power close” when vehicle is in Neutral and rolling
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Vehicle speed sensor Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fob and keyless entry system. Repair as necessary
$8E OPEN INHIBIT - IGNITION IN START POSITION
Operator attempted “power open” with the ignition in the Start position
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fob and keyless entry system. Repair as necessary
$8F CLOSE INHIBIT - IGNITION IN START POSITION
Operator attempted “power close” with the ignition in the Start position
Inform customer of operating restrictions
Ignition status problem Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
different voltage and driving conditions. Repair as necessary
FOBIK Verify proper operation of the key fob and keyless entry system. Repair as necessary
$90 OPEN INHIBIT - IN-PLANT MODE
Power Open will not function because the power liftgate control module is in the In-Plant mode
Using a scan tool, perform the power liftgate control module learn cycle, (Refer to 08 - Electrical/Power Liftgate/Standard Procedure) . If learn cycle does not correct the problem replace the power liftgate control module
$91 CLOSE INHIBIT - IN-PLANT MODE
Power Close will not function because the power liftgate control module is in the In-Plant mode
Using a scan tool, perform the power liftgate control module learn cycle, (Refer to 08 - Electrical/Power Liftgate/Standard Procedure) . If learn cycle does not correct the problem replace the power liftgate control module
$92 OPEN INHIBIT - GEAR/SPEED MISMATCH
Power Open will not function because of a conflict between the PRNDL and vehicle speed inputs
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify PRNDL status reads correctly. If NOT OK, verify proper operation of the transmission range sensor, repair as necessary.
Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
The inhibitor could have been operator induced by placing the transmission in Park when the vehicle is still rolling and immediately attempting an Open liftgate command
$93 CLOSE INHIBIT - GEAR/SPEED MISMATCH
Power Close will not function because of a conflict between the
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
PRNDL and vehicle speed inputs
reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify PRNDL status reads correctly. If NOT OK, verify proper operation of the transmission range sensor, repair as necessary.
Verify the ignition switch status reads correctly using a scan tool. Repair as necessary
The inhibitor could have been operator induced by placing the transmission in Park when the vehicle is still rolling and immediately attempting a Close liftgate command
$94 OPEN INHIBIT - NOT FULLY OPEN OR FULLY CLOSED
Operator induced by placing the liftgate in the primary or secondary latch position when the liftgate was open
Inform customer of proper power liftgate/latch operation
Conflict in liftgate latch switches and full open switch
Using a scan tool, observe the liftgate latch “Full Open, Primary, Secondary, Sector and Paw” switch readings with the liftgate in the fully open position. Verify that the “Full Open, Primary, Secondary and Paw” readings are all “Closed” and the “Sector” reading is “Open”. Repair as necessary
Using a scan tool, observe the liftgate latch “Full Open, Primary, Secondary, Sector and Paw” switch readings with the liftgate in the fully closed position. Verify that the “Full Open, Primary, Secondary, Sector and Paw” readings are all “Open”. Repair as necessary
Full open switch
Using a scan tool, verify proper operation of the full open switch during a power liftgate cycle. Switch reading should be “closed” with the liftgate a few degrees below fully opened and “open” in all other positions. Repair as necessary
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Using a scan tool, verify proper operation of the full open switch during a manual liftgate cycle. Switch reading should be “closed” with the liftgate a few degrees below fully opened and “open” in all other positions. Repair as necessary
$95 LATCH RELEASE INHIBIT - LOCK ENGAGED
Vehicle was locked when the operator attempted to release the liftgate latch using the exterior handle
Inform customer of proper power liftgate/latch operation
Invalid lock status received by the power liftgate control module
Using a scan tool observe the Bussed inputs to the power liftgate control module. Cycle the power door locks using the key fob, auto locks and interior lock switches. Verify the “Lock” status reads correctly, repair as necessary.
$96 LATCH CINCH ABORTED - LEFT PINCH SENSOR ACTIVE
Pinch was activated when liftgate latch was cinching
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
Short to ground on left pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative left pinch sensor
Measure the resistance of the left pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the left pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the left pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
OK, replace the inoperative power liftgate control module
$97 LATCH CINCH ABORTED - RIGHT PINCH SENSOR ACTIVE
Pinch was activated when liftgate latch was cinching
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
Short to ground on left pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative right pinch sensor
Measure the resistance of the right pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the right pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the right pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$98 OPEN CANCELLED - HANDLE ACTIVE
Operator induced by grabbing the exterior handle while a “power open” cycle was taking place
Inform customer of operating restrictions
Liftgate release switch Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is approximately 2.4V with handle activated and greater than 4.6V when released.
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Using a digital multi-meter, measure the resistance of the liftgate release switch (located in the latch assembly). The multi-meter should read approximately 4.7K ohms activated and “open” with handle released. Repair as necessary
$99 OPEN CANCELLED - RKE ACTIVE
A “power open” cycle was cancelled during the first two seconds (while chiming) by an RKE signal
Inform customer of operating restrictions. Key fob buttons may get inadvertently pressed when in a pocket or purse. Rapid pressing of the buttons may also be the cause
FOBIK Using a scan tool, verify the key fobik button status readings from the FOBIK are correct
Verify key fob is operating properly and buttons are not sticking. Repair as necessary
$9A OPEN CANCELLED - OVERHEAD/IP ACTIVE
A “power open” cycle was cancelled during the first two seconds (while chiming) by an overhead console liftgate switch signal
Inform customer of operating restrictions. The overhead console liftgate switch may have been double pressed
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
$9B CLOSE CANCELLED - HANDLE ACTIVE
Operator induced by grabbing the exterior handle while a “power close” cycle was taking place
Inform customer of operating restrictions
Liftgate release switch Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
approximately 2.4V with handle activated and greater than 4.6V when released.
Using a digital multi-meter, measure the resistance of the liftgate release switch (located in the latch assembly). The multi-meter should read approximately 4.7K ohms activated and “open” with handle released. Repair as necessary
$9C CLOSED CANCELLED - RKE ACTIVE
A “power close” cycle was cancelled during the first two seconds (while chiming) by an RKE signal
Inform customer of operating restrictions. Key fobik buttons may get inadvertently pressed when in a pocket or purse. Rapid pressing of the buttons may also be the cause
WIN Using a scan tool, verify the key fobik button status readings from the FOBIK are correct
Verify key fob is operating properly and buttons are not sticking. Repair as necessary
$9D CLOSE CANCELLED - OVERHEAD/IP ACTIVE
A “power close” cycle was cancelled during the first two seconds (while chiming) by an overhead console liftgate switch signal
Inform customer of operating restrictions. The overhead console liftgate switch may have been double pressed
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
$9E CLOSE CANCELLED - LEFT PINCH SENSOR DETECTED
A “power close” cycle was cancelled during the first two seconds (while chiming) by a left pinch sensor signal
Inform customer of pinch sensor operation
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
Short to ground on left pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative left pinch sensor
Measure the resistance of the left pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the left pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the left pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$9F CLOSE CANCELLED - RIGHT PINCH SENSOR DETECTED
A “power close” cycle was cancelled during the first two seconds (while chiming) by a right pinch sensor signal
Inform customer of pinch sensor operation
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Short to ground on right pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative right pinch sensor
Measure the resistance of the right pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the right pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the right pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$A0 OPEN REVERSAL - GEAR OR SPEED STATE CHANGE
Operator shifted vehicle out of Park/Neutral while a “power open” cycle was in progress
Inform customer of operating restrictions
Vehicle speed sensor
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.
Transmission range sensor problem
Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify PRNDL status reads correctly. If NOT OK, verify proper operation of the transmission range sensor, repair as necessary.
$A1 OPEN REVERSAL - USER INPUT
Operator activated either a key fob button or overhead console liftgate switch while a “power open or close” cycle was in progress
Inform customer of operating restrictions. The overhead console liftgate switch may have been double pressed or the key fob buttons may get inadvertently pressed when in a pocket or purse. Rapid pressing of the buttons may also be the cause
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
WIN Using a scan tool, verify the key fobik button status readings from the FOBIK are correct
Verify key fob is operating properly and buttons are not sticking. Repair as necessary
$A2 CLOSE REVERSAL - USER INPUT
Operator activated either a key fob button or overhead console liftgate switch while a “power open or close” cycle was in progress
Inform customer of operating restrictions. The overhead console liftgate switch may have been double pressed or the key fob buttons may get inadvertently pressed when in a pocket or purse. Rapid pressing of the buttons may also be the cause
Overhead console liftgate switch
Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under different voltage and driving conditions. Repair as necessary
WIN Using a scan tool, verify the key fobik button status readings from the FOBIK are correct
Verify key fob is operating properly and buttons are not sticking. Repair as necessary
$A3 CLOSE REVERSAL - LEFT PINCH SENSOR DETECTED
A “power close” cycle reversed direction due to a left pinch sensor signal
Inform customer of pinch sensor operation
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Short to ground on left pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative left pinch sensor
Measure the resistance of the left pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the left pinch sensor
Power liftgate control module
Use a scan tool to observe the voltage of the left pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$A4 CLOSE REVERSAL - RIGHT PINCH SENSOR DETECTED
A “power close” cycle reversed direction due to a right pinch sensor signal
Inform customer of pinch sensor operation
Check for obstructions causing pinch sensor activation. Repair as necessary
Check the pinch strip for areas that may be coming in contact with other parts of the vehicle
Ensure the pinch strip is properly secured to the liftgate
Short to ground on right pinch sensor signal circuit
Check signal circuit and repair as necessary
Inoperative right pinch sensor
Measure the resistance of the right pinch sensor in an unpinched state. If the resistance is less than 9k ohms, replace the right pinch sensor
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
Power liftgate control module
Use a scan tool to observe the voltage of the right pinch sensor with the sensor unplugged. The reading should be approximately 5V. Short the pinch sensor circuit to ground and recheck the scan tool reading. The reading should be approximately 0V. If the readings are NOT OK, replace the inoperative power liftgate control module
$A5 CLOSE REVERSAL - HANDLE ACTIVE
A “power close” cycle reversed direction due to the operator grabbing the exterior handle while a “power close” cycle was taking place
Inform customer of operating restrictions
Liftgate release switch
Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is approximately 2.4V with handle activated and greater than 4.6V when released.
Using a digital multi-meter, measure the resistance of the liftgate release switch (located in the latch assembly). The multi-meter should read approximately 4.7K ohms activated and “open” with handle released. Repair as necessary
$A6 OPEN ABORTED - HANDLE ACTIVE
Operator induced by grabbing the exterior handle while a “power open” cycle was taking place
Inform customer of operating restrictions
Liftgate release switch
Using a scan tool, observe inputs to the power liftgate control module. Verify the liftgate release switch (located in the latch assembly) reading is approximately 2.4V with handle activated and greater than 4.6V when released.
Using a digital multi-meter, measure the resistance of the liftgate release switch (located in the latch assembly). The multi-meter should read approximately
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
4.7K ohms activated and “open” with handle released. Repair as necessary
$A7 OPEN OBSTACLE
An obstacle was detected while a “power open” cycle was taking place
Normal operation, inform customer of operating restrictions
Binding or sticking of components
Using a scan tool, move liftgate manually to the “Gate Position” indicated in the Inhibit Monitor record. Establish location of obstruction/binding and replace necessary components
The power liftgate control module is not properly calibrated
Using a scan tool, perform the power liftgate control module learn cycle, (Refer to 08 - Electrical/Power Liftgate/Standard Procedure) . If learn cycle does not correct the problem replace the power liftgate control module
$A8 CLOSE OBSTACLE
An obstacle was detected while a “power close” cycle was taking place
Normal operation, inform customer of operating restrictions
Binding or sticking of components
Using a scan tool, move liftgate manually to the “Gate Position” indicated in the Inhibit Monitor record. Establish location of obstruction/binding and replace necessary components
The power liftgate control module is not properly calibrated
Using a scan tool, perform the power liftgate control module learn cycle, (Refer to 08 - Electrical/Power Liftgate/Standard Procedure) . If learn cycle does not correct the problem replace the power liftgate control module
$A9 WRONG SOFTWARE VERSION
Current power liftgate control module software version does not match bootloader and possibly hardware version
If an updated software version is available, reflash the power liftgate control module. If updated software is not available, replace the power liftgate control module
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INHIBIT
MONITOR
POSSIBLE CAUSES CORRECTION
$AA LATCH IS NOT NEAR SECONDARY STATE
Operator induced by placing the liftgate in the primary or secondary latch position when the liftgate was open
Inform customer of proper power liftgate/latch operation
Wiring problem
Using a scan tool, verify that the position sensor 1 and 2 toggle between “Open” and “Closed”. If readings are inaccurate, diagnose the wiring for possible opens, or shorts to ground/voltage. Repair as necessary
Power liftgate drive unit position sensor
Manually open the liftgate to the fully open position. Bring the liftgate down to just before the latch contacts the striker. Using a scan tool, observe the “gate position counts”. If the count is greater than 20, replace the inoperative power liftgate drive unit
Power liftgate control module
Using a scan tool, observe the position sensor 1 and 2 status. Disconnect the power liftgate drive unit electrical connector. Apply opens and grounds to the position sensor signal circuits. Verify the power liftgate control module reads the correct “Open/Closed” status. If readings are NOT OK, replace the power liftgate control module
$AB OPEN INHIBIT - VTA ARMED
The overhead console liftgate switch would not initiate a “power open” cycle because the Vehicle Theft Alarm (VTA) was armed
Normal operation, inform customer of operating restrictions
Invalid VTA status
Verify proper operation of the VTA system and instrument cluster or Cab Compartment Node (CCN) bussed outputs using a scan tool and the appropriate diagnostic information. Repair as necessary
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