B1953-POWER LIFTGATE LATCH CINCH OVERCURRENT
For a complete wiring diagram Refer to Section 8W
- 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.
| Possible Causes |
| BINDING LIFTGATE |
| LATCH NOT IN HOME POSITION |
| (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN |
| (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN |
| (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND |
| (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT |
| (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND |
| (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT |
| (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO VOLTAGE |
| POWER LIFTGATE MODULE |
| LATCH ASSEMBLY |
Diagnostic Test
1. DTC PRESENTEnsure 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 DTCs.
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 To2
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. BINDING LIFTGATE
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.
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 any mechanical problems found?
Yes
- Refer to Service information for the related symptom(s).
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To3
3. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN
Turn the ignition off.
Disconnect the Power Liftgate Module C2 harness connector.
Disconnect the Power Liftgate Latch harness connector.
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.
Wiggle the harness and check for an intermittent open condition.
Is the resistance below 5.0 ohms?
Yes
- Go To4
No
- Repair the (Q84) Liftgate Latch Cinch Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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 harness connector and the Power Liftgate Latch harness connector.
Wiggle the harness and check for an intermittent open condition.
Is the resistance below 5.0 ohms?
Yes
- Go To5
No
- Repair the (Q85) Liftgate Latch Release Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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 To6
Yes
- Repair the (Q84) Liftgate Latch Cinch Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
6. (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT
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 To7
Yes
- Repair the (Q84) Liftgate Latch Cinch Driver wire for a short to the (Q901) Logic Ground circuit.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
7. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND
Measure the resistance between ground 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 To8
Yes
- Repair the (Q85) Liftgate Latch Release Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
8. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND CIRCUIT
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 circuit for a short to the (Q901) Logic Ground circuit.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
9. (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 Power Liftgate Latch Assembly in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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 in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).