B1953

B1953-POWER LIFTGATE LATCH CINCH OVERCURRENT





For a complete wiring diagram Consult Diagrams/Electrical

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

- Set Condition:
The latch motor stall current of 6.2 amps has been detected for over 200ms, with no pawl or ratchet failure.





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 B1953-POWER LIFTGATE LATCH CINCH OVERCURRENT?

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 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 4

No

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

4. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN




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 5

No

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

5. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND




Measure the resistance between ground and the (Q84) Liftgate Latch Cinch Driver circuit.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 1000.0 ohms?

No

- Go To 6

Yes

- Repair the (Q84) Liftgate Latch Cinch Driver wire for a short to ground.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

6. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO (Q901) LOGIC GROUND




Measure the resistance between the (Q901) Logic Ground circuit and the (Q84) Liftgate Latch Cinch Driver circuit.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 1000.0 ohms?

No

- Go To 7

Yes

- Repair the (Q84) Liftgate Latch Cinch Driver wire for a short to the (Q901) Logic Ground circuit.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

7. (Q84) LIFTGATE LATCH RELEASE DRIVER WIRE SHORT TO GROUND




Measure the resistance between ground and the (Q84) Liftgate Latch Release Driver circuit.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 1000.0 ohms?

No

- Go To 8

Yes

- Repair the Liftgate Latch Release Driver wire for a short to ground.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

8. (Q85) LIFTGATE LATCH RELEASE DRIVER WIRE SHORT TO (Q901) LOGIC GROUND




Measure the resistance between the (Q901) Logic Ground circuit and the (Q85) Liftgate Latch Release Driver circuit.
Wiggle the harness and check for an intermittent short condition.
Is the resistance below 1000.0 ohms?

No

- Go To 9

Yes

- Repair the (Q85) Liftgate Latch Release Driver wire for a short to the Ground circuit.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

9. (G78) LIFTGATE AJAR SWITCH SENSE WIRE SHORT TO GROUND




Reconnect the Power Liftgate Module connectors.
Measure the resistance of the (G78) Liftgate Ajar Switch Sense wire to the (Q901) Logic Ground circuit in the Liftgate Cinch/Release Motor connector.
Wiggle the harness while observing the ohmmeter.
Is the resistance below 1000.0 ohms?

No

- Go To 10

Yes

- Repair the (G78) Liftgate Ajar Switch Sense wire for a short to ground.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

10. (Q84) LIFTGATE LATCH CINCH DRIVER WIRE SHORT TO VOLTAGE




Turn the ignition on.
Measure the voltage between the (Q84) Liftgate Latch Cinch Driver circuit and ground.
Is there any voltage present?

No

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

Yes

- Repair the (Q84) Liftgate Latch Cinch Driver wire for a short to voltage. If no obvious wiring problems have been identified, replace the Power Liftgate Module .
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test