B1956

B1956-POWER LIFTGATE LATCH RELEASE - EXCESSIVE TIME





For a complete wiring diagram Consult Diagrams/Electrical

NOTE: If there are any other Power Liftgate DTC's present, correct them before proceeding with this test.

- When Monitored:
Whenever the power liftgate is performing a releasing operation.

- Set Condition:
The cinch/release motor should perform its operation within 4 seconds. When it takes longer for the release operation, this code will set.





Diagnostic Test

1. DTC PRESENT
Ensure the liftgate is closed and with the scan tool, run the "Latch Home Position Test" before proceeding to ensure the latch is positioned correctly.
With the scan tool, record and erase DTC's.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
Operate the power liftgate several times if possible.
With the scan tool, read ACTIVE DTCs.
Does the scan tool display B1956-POWER LIFTGATE LATCH RELEASE - EXCESSIVE TIME?

Yes

- Go To 2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding or other obstructions.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

2. BINDING LIFTGATE
Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip, and hinge assembly for wear or anything that would cause an obstruction to proper operation.
If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison.
Especially notice the effort needed to unlatch and close the liftgate.
Were there any mechanical problems found?

Yes

- Repair accordingly.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN




Turn the ignition off.
Disconnect the Power Liftgate Module C2 and C3 connectors.
Check connectors - Clean/repair as necessary.
Reconnect the PLG C3 connector.
Disconnect the Liftgate Cinch/Release Motor connector.
Measure the resistance of the (Q84) Liftgate Latch Cinch Driver circuit between the Power Liftgate Module C2 connector and the Liftgate Cinch/Release Motor connector.
Wiggle the harness and check for an intermittent open condition.
Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the (Q84) Liftgate Latch Cinch Driver wire for high resistance.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (Q83) LIFTGATE LATCH CLUTCH DRIVER CIRCUIT OPEN




Disconnect the Power Liftgate Module C2 connector.
Measure the resistance of the (Q83) Liftgate Latch Clutch Driver circuit between the PLGM C2 connector and the Liftgate Cinch/Release Motor connector.
Is the resistance below 2.0 ohms?

Yes

- Go To 5

No

- Repair the (Q83) Liftgate Latch Clutch Driver circuit for an open.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

5. (Q85) LIFTGATE LATCH RELEASE DRIVER WIRE HIGH RESISTED




Measure the resistance of the (Q85) Liftgate Latch Release Driver circuit between the Power Liftgate Module C2 connector and the Liftgate Cinch/Release Motor connector.
Wiggle the harness and check for an intermittent open condition.
Is the resistance below 5.0 ohms?

Yes

- Go To 6

No

- Repair the (Q85) Liftgate Latch Release Driver wire for high resistance.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

6. (Q901) LOGIC GROUND WIRE HIGH RESISTED




Measure the resistance of the (Q901) Logic Ground circuit between the PLG C2 connector and the Liftgate Cinch/Release Motor connector.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 2.0 ohms?

No

- Repair the (Q901) Logic Ground circuit for high resistance
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

Yes

- Go To 7
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

7. (G78) LIFTGATE AJAR SWITCH SENSE WIRE HIGH RESISTED




Measure the resistance of the (G78) Liftgate Ajar Switch Sense wire between the PLG C2 connector and the Liftgate Cinch/Release Motor connector.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 5.0 ohms?

No

- Repair the (G78) Liftgate Ajar Switch Sense wire for high resistance.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

Yes

- Replace the Liftgate Cinch/Release Motor.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test