*TAILGATE AJAR CIRCUIT OPEN

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

TAILGATE AJAR SWITCH GROUND CIRCUIT OPEN

(G78) TAILGATE AJAR SWITCH SENSE CIRCUIT OPEN

TAILGATE LOCK MOTOR/AJAR SWITCH

BODY CONTROL MODULE

Diagnostic Test

1.OPEN TAILGATE SWITCH GROUND CIRCUIT

Does the test light illuminate brightly?

Yes

Go To2

Repair the Tailgate Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2.CHECK FOR OPEN TAILGATE AJAR SWITCH

Does the scan tool display TAILGATE AJAR SW: TRUE?

Yes

Replace the Tailgate Lock Motor/Ajar Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To3

Is the resistance below 5.0 ohms?

Yes

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)

Repair the (G78) Tailgate Ajar Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)