DIAGNOSIS AND TESTING - POWER LIFTGATE SYSTEM...scan tool, replace latch if necessary Power Liftgate...

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)





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



Controller Area Network (CAN) Data Bus issue

Refer to 8 – ELECTRICAL/ELECTRONIC CONTROL MODULES – ELECTRICAL DIAGNOSTICS



CONDITION POSSIBLE

CAUSES

CORRECTION



OVERHEAD CONSOLE SWITCH DOES NOT OPERATE POWER LIFTGATE (BUT KEY FOB DOES)





Failure of overhead console switch

(Refer to 08 - Electrical/Power Sliding Door/Description) .





LATCH WILL NOT RELEASE WITH OUTSIDE HANDLE (POWER-OPEN CYCLE MAY OR MAY NOT INITIATE)





Failure of outside handle/linkage

(Refer to 23 - Body/Decklid/Hatch/Liftgate/Tailgate/HANDLE, Exterior/Removal)



CONDITION POSSIBLE

CAUSES

CORRECTION

Failure of outside handle switch

Check for diagnostic trouble codes and cycle with scan tool, repair as required







Establish location of binding and replace necessary components



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









CONDITION POSSIBLE

CAUSES

CORRECTION







LATCH WILL NOT POWER-CINCH TO PRIMARY POSITION (DURING MANUAL AND/OR POWER OPERATION)



Pinch sensor activated or open/short circuit

Check pinch sensor status with scan tool. Repair as required.





Door seal force too high

Inspect seals for damage, improper installation, foreign matter or other possible obstruction. Repair as required







CONDITION POSSIBLE

CAUSES

CORRECTION




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


Check Inhibit Monitors with scan tool repair as required.

Failure of liftgate strut-supports (prop rods)

Check for broken attachments

Replace prop rods





Grade of vehicle too steep for power operation

Operate liftgate manually



CONDITION POSSIBLE

CAUSES

CORRECTION



LIFTGATE CONTINUES TO POWER-CLOSE AFTER REACHING FULL-CLOSED POSITION












LIFTGATE CONTINUES TO POWER-OPEN AFTER REACHING FULL-OPEN POSITION (MAY PULSE SEVERAL TIMES)







CONDITION POSSIBLE

CAUSES

CORRECTION

Failure of full open switch

Check switch status with scan tool, replace switch 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







Failure of key fob button or overhead console switch

Check for shorted or defective switch



CONDITION POSSIBLE

CAUSES

CORRECTION






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.



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



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



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.



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



INHIBIT

MONITOR


$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) .



INHIBIT

MONITOR


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


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




INHIBIT

MONITOR



Short to ground on right pinch sensor signal circuit


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


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


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



INHIBIT

MONITOR


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






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




INHIBIT

MONITOR


Operator attempted manual latch release with exterior handle when vehicle was not in Park/Neutral



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.





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



Vehicle speed sensor Using a scan tool observe the Bussed inputs to the power liftgate control module. Verify vehicle speed



INHIBIT

MONITOR


reads correctly. If NOT OK, verify proper operation of the vehicle speed sensor, repair as necessary.




$8E OPEN INHIBIT - IGNITION IN START POSITION

Operator attempted “power open” with the ignition in the Start position






$8F CLOSE INHIBIT - IGNITION IN START POSITION

Operator attempted “power close” with the ignition in the Start position




Using a scan tool, observe overhead console liftgate switch reading. Verify the reading is correct under



INHIBIT

MONITOR


different voltage and driving conditions. 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


$92 OPEN INHIBIT - GEAR/SPEED MISMATCH

Power Open will not function because of a conflict between the PRNDL and vehicle speed inputs



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



INHIBIT

MONITOR


PRNDL and vehicle speed inputs

reads correctly. If NOT OK, verify proper operation of the vehicle speed 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



INHIBIT

MONITOR


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


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 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






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



INHIBIT

MONITOR


OK, replace the inoperative power liftgate control module

$97 LATCH CINCH ABORTED - RIGHT PINCH SENSOR ACTIVE

Pinch was activated when liftgate latch was cinching










$98 OPEN CANCELLED - HANDLE ACTIVE

Operator induced by grabbing the exterior handle while a “power open” cycle was taking place


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.



INHIBIT

MONITOR


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



$9B CLOSE CANCELLED - HANDLE ACTIVE

Operator induced by grabbing the exterior handle while a “power close” cycle was taking place


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



INHIBIT

MONITOR


approximately 2.4V with handle activated and greater than 4.6V when released.


$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


$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



$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




INHIBIT

MONITOR











$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







INHIBIT

MONITOR








$A0 OPEN REVERSAL - GEAR OR SPEED STATE CHANGE

Operator shifted vehicle out of Park/Neutral while a “power open” cycle was in progress


Vehicle speed sensor




$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





INHIBIT

MONITOR




$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





$A3 CLOSE REVERSAL - LEFT PINCH SENSOR DETECTED

A “power close” cycle reversed direction due to a left pinch sensor signal







INHIBIT

MONITOR








$A4 CLOSE REVERSAL - RIGHT PINCH SENSOR DETECTED

A “power close” cycle reversed direction due to a right pinch sensor signal











INHIBIT

MONITOR




$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



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.


$A6 OPEN ABORTED - HANDLE ACTIVE

Operator induced by grabbing the exterior handle while a “power open” cycle was taking place



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



INHIBIT

MONITOR


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


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


$A8 CLOSE OBSTACLE

An obstacle was detected while a “power close” cycle was taking place



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


$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



INHIBIT

MONITOR


$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


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


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


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



DIAGNOSIS AND TESTING - POWER LIFTGATE SYSTEM...scan tool, replace latch if necessary Power Liftgate...

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Transcript of DIAGNOSIS AND TESTING - POWER LIFTGATE SYSTEM...scan tool, replace latch if necessary Power Liftgate...