Driver Door Fails To Lock And Unlock

Possible Causes:

Testing

Remove the door trim panel to gain access to the Door Lock Motor connector. See FRONT DOOR TRIM PANEL under REMOVAL & INSTALLATION in POWER DOOR LOCKS - LIBERTY article. Disconnect the Driver Door Lock Motor connector. Remove the key from the ignition switch. Connect a test light between the Door Lock Relay Output and the Driver Door Unlock Relay Output circuits in the door lock motor connector. Press the door lock switch to the Lock and Unlock positions. Did the test light illuminate brightly when the lock switch was pressed in both directions? If yes, replace the Door Lock Motor. Perform BODY VERIFICATION TEST . If no, go to next step.
Disconnect the Door Lock Motor connector. Using a 12-volt test light connected to ground, check the Driver Door Unlock Relay Output circuit. With the DRBIII(R), actuate the DRIVER DOOR UNLOCK RELAY. Does the test light illuminate brightly when the relay is actuated? If yes, go to next step. If no, repair the Driver Door Unlock Relay Output wire. Perform BODY VERIFICATION TEST .
Disconnect the Door Lock Motor connector. Using a 12-volt test light connected to ground, check the Door Lock Relay Output circuit. With the DRBIII(R), actuate the Door Lock Relay. Does the test light illuminate brightly when the relay is actuated? If yes, test complete. If no, repair the Door Lock Relay Output wire for an open. Perform BODY VERIFICATION TEST .