B1980-POWER LIFTGATE LATCH CONTROL 1 CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
Anytime the Power Liftgate is in a latch cinch or release operation.
- Set Condition:
When the liftgate latch motor cinch or release output is pulled low prior to or during a latch cinch or release operation, this code will set.
| Possible Causes |
| (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND |
| (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND |
| LATCH ASSEMBLY |
| POWER LIFTGATE MODULE |
Diagnostic Test
1. DTC PRESENTWith 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 DTCs.
If the B210D–BATTERY VOLTAGE LOW DTC is present, repair that code before proceeding.
Does the scan tool display B1980–POWER LIFTGATE LATCH CONTROL 1 CIRCUIT LOW?
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 conditions in the latch assembly.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. BINDING LIFTGATE LATCH
Examine the liftgate for proper alignment, worn or binding hinges, latch alignment or anything that would cause an obstruction to proper operation.
With an open liftgate, manually close the latch and open it with the handle switch several times.
Were there 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. CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND
Turn the ignition off.
Disconnect the Power Liftgate Latch harness connector.
Measure the resistance between the (Q901) Logic Ground circuit and the (Q84) Liftgate Latch Cinch Driver circuit in the Power Liftgate Latch harness connector.
Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance below 100.0 ohms?
Yes
- Repair the (Q84) Liftgate Latch Cinch 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).
No
- Go To 4
4. CHECK THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND
Measure the resistance between the (Q901) Logic Ground circuit and the (Q85) Liftgate Latch Release Driver circuit in the Power Liftgate Latch harness connector.
Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance below 100.0 ohms?
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).
No
- Go To 5
5. CHECK THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO GROUND
Disconnect the Power Liftgate Module C2 harness connector.
Measure the resistance between ground and the (Q85) Liftgate Latch Release Driver circuit.
Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance below 10000.0 ohms?
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).
No
- Go To 6.
6. CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A 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 circuit condition.
Is the resistance below 10000.0 ohms?
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).
No
- Replace the Power Liftgate Module in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).