Power Door Lock Actuator: Testing and Inspection

DIAGNOSIS AND TESTING - POWER LOCK MOTOR

Remember, the Body Control Module (BCM) (also known as the Common Body Controller/CBC) circuitry controls the outputs to the power lock motors. If both the power lock motors and the circuits between the motors and the BCM test okay, the use of a diagnostic scan tool is required for further power lock system diagnosis. Refer to the appropriate diagnostic information.

Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

1. Check the power lock motor for correct operation while moving a power lock switch to both the Lock and Unlock positions.
2. Disconnect the door or body wire harness connector from the inoperative power lock motor.
3. Apply 12 volts to the lock and unlock driver circuit cavities of the power lock motor connector to check its operation in one direction.
4. Reverse the connection polarity to check the motor operation in the opposite direction.
5. If motor operation is okay in both directions, check both the lock and unlock circuits between the lock motor and the BCM and repair if required. If motor operation is not okay in both directions, replace the latch unit containing the ineffective power lock motor.