*TAILGATE AJAR CIRCUIT SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The scan tool will display the door state NOT the switch state. It will display as True/False. True states that the door is ajar (open). False states that the door is NOT ajar (closed).
| Possible Causes |
| (G78) TAILGATE AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND |
| TAILGATE LOCK MOTOR/AJAR SWITCH |
| BODY CONTROL MODULE |
Diagnostic Test
1. CHECK FOR SHORTED TAILGATE AJAR SWITCH
With the scan tool in Data Display, read the TAILGATE AJAR SW state.
Disconnect the Tailgate Lock Motor/Ajar Switch connector.
Does the scan tool display TAILGATE AJAR SW: FALSE?
Yes
- Replace the Tailgate Lock Motor/Ajar Switch.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To2
2. CHECK FOR (G78) TAILGATE AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module C1 harness connector.
Turn the ignition on.
Using a 12–volt test light connected to 12–volts, test the (G78) Tailgate Ajar Switch Sense circuit for a short to ground.
Does the test light illuminate brightly?
No
- Replace the Body Control Module in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
Yes
- Repair the (G78) Tailgate Ajar Switch Sense circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)