B1953

B1953-POWER LIFTGATE LATCH CINCH OVERCURRENT





For a complete wiring diagram, refer to the Wiring Information.

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

- Set Condition:
The latch motor stall current of 12.0 amps has been detected for over 500ms, with no pawl or ratchet failure.





1. DIAGNOSTIC TROUBLE CODE (DTC) PRESENT
1. Make sure the liftgate is closed and with the scan tool, run the "Latch Home Position Test" before proceeding to ensure the latch is positioned correctly.
2. Using the scan tool, record and erase DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. Operate the power liftgate several times if possible.
5. Using the scan tool, read ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)s.

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 the BODY VERIFICATION TEST. Body Verification Test.

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

Were any mechanical problems found?

Yes

- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C2 harness connector.
3. Disconnect the Power Liftgate Latch harness connector.
4. Measure the resistance of the (Q84) Liftgate Latch Cinch Driver circuit between the Power Liftgate Module C2 harness connector and the Power Liftgate Latch harness connector.
5. 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 circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN




1. Measure the resistance of the (Q85) Liftgate Latch Release Driver circuit between the Power Liftgate Module C2 harness connector and the Power Liftgate Latch harness connector.
2. 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 circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




1. Measure the resistance between ground and the (Q84) Liftgate Latch Cinch Driver circuit.
2. Wiggle the harness and check for an intermittent short condition.

Is the resistance below 1000.0 Ohms?

Yes

- Repair the (Q84) Liftgate Latch Cinch Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 6

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




1. Measure the resistance between the (Q901) Logic Ground circuit and the (Q84) Liftgate Latch Cinch Driver circuit.
2. Wiggle the harness and check for an intermittent short condition.

Is the resistance below 1000.0 Ohms?

Yes

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

No

- Go To 7

7. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (Q85) Liftgate Latch Release Driver circuit.
2. Wiggle the harness and check for an intermittent short condition.

Is the resistance below 1000.0 Ohms?

Yes

- Repair the (Q85) Liftgate Latch Release Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 8

8. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORTED TO THE (Q901) LOGIC GROUND CIRCUIT




1. Measure the resistance between the (Q901) Logic Ground circuit and the (Q85) Liftgate Latch Release Driver circuit.
2. Wiggle the harness and check for an intermittent short condition.

Is the resistance below 1000.0 Ohms?

Yes

- Repair the (Q85) Liftgate Latch Release Driver circuit for a short to the (Q901) Logic Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 9

9. (Q84) LIFTGATE LATCH CINCH DRIVER WIRE SHORTED TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage between the (Q84) Liftgate Latch Cinch Driver circuit and ground.

Is there any voltage present?

Yes

- Repair the (Q84) Liftgate Latch Cinch Driver circuit for a short to voltage. If the (Q84) Liftgate Latch Cinch Driver circuit is OK, replace the Power Liftgate Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Power Liftgate Latch Assembly.
- Perform the BODY VERIFICATION TEST. Body Verification Test.