Power Door Locks - Inoperative

DIAGNOSTIC AIDS
The following may cause erratic door lock operation.
^ A high resistance or an open in the ground circuit of the power door lock switch.
^ An intermittent or poor connection of the wiring and connectors.

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis and unnecessary parts replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-4:

Steps 5-15:

Steps 16-24:

The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if a rear door lock actuator has a control circuit shorted to ground. This condition could open the RRDRMDL fuse when the rear door lock actuator is actuated and cause DTCs U1162 and U1163 to be simultaneously set current.
4. This step checks to see that the door module associated with the inoperative window recognizes the switch input.
Enabling the headlamps in this step eliminates the possibility of the window switch using an alternative path to ground through the switch illumination circuit, which could cause the scan tool to display incorrect switch states.
13. This step eliminates the logic ground circuit of the inoperative door module as the cause of the malfunction.
16. This step directs you to, either inspect for poor connections at the passenger door module, or, at the driver door switch assembly (DDSA) as a pre-requisite to replacing the passenger door module or driver door switch assembly (DDSA). This is because lock switch signals for the driver door are detected and processed by the driver door switch assembly (DDSA), while lock switch signals for the passenger door are detected and processed by the passenger door module.
21. This step directs you to, either replace the passenger door module or driver door switch assembly (DDSA). This is because lock switch signals for the driver door are detected and processed by the driver door switch assembly (DDSA), while lock switch signals for the passenger door are detected and processed by the passenger door module.