Liftgate Lock Fails To Lock/Unlock

Possible Causes are:

• OPEN LIFTGATE LOCK MOTOR
• OPEN DOOR LOCK DRIVER WIRE
• OPEN DOOR UNLOCK DRIVER WIRE

1. Remove the liftgate inner door trim panel to gain access to the Liftgate Lock Motor connector. Disconnect the Liftgate Lock Motor connector. Ensure the Passenger Door Module C1 connector is connected. Connect a test light between the Door Lock Driver and the Door Unlock Driver terminals in the liftgate lock motor connector. Using the DRBIII(R), actuate the Passenger Lock Relay and then the Passenger Unlock Relay and observe the test light. Did the test light illuminate when the lock was actuated in both directions? If yes, replace the Liftgate Lock Motor. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
2. Remove the liftgate inner door trim panel to gain access to the Liftgate Lock Motor connector. Disconnect the Liftgate Lock Motor connector. Disconnect the Passenger Door Module C1 connector. Measure the resistance of the Door Lock Driver circuit between the PDM connector and the liftgate lock motor connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Door Lock Driver wire. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
3. Remove the liftgate inner door trim panel to gain access to the Liftgate Lock Motor connector. Disconnect the Liftgate Lock Motor connector. Disconnect the Passenger Door Module C1 connector. Measure the resistance of the Door Unlock Driver circuit between the PDM connector and the liftgate, lock motor connector. Is the resistance less than 5 ohms? If yes, test is complete. If no, repair the open Door Unlock Driver wire. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.