Power Locks: Testing and Inspection

DIAGNOSIS AND TESTING - POWER LOCKS AND REMOTE KEYLESS ENTRY SYSTEM

POWER LOCK SYSTEM

Following are tests that may help to diagnose the hard wired components and circuits of the power lock system. However, these tests may not prove conclusive in the diagnosis of this system. The most reliable, efficient, and accurate means to diagnose the power lock system requires the use of a diagnostic scan tool and the appropriate diagnostic information. The diagnostic scan tool can provide confirmation that the power lock motors are receiving the proper hard wired outputs from the Body Control Module (BCM) for them to perform their power lock system functions.

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.

PRELIMINARY DIAGNOSIS

As a preliminary diagnosis for the power lock system, note the system operation while you actuate both the Lock and Unlock functions with the power lock switch and with the Remote Keyless Entry (RKE) transmitter. Then, proceed as follows:

1. If the entire power lock system fails to function with either the power lock switch or the RKE transmitter, check the fused B(+) fuse for the power lock system in the Power Distribution Center (PDC).
2. If the power lock system functions with the power lock switch, but not with the RKE transmitter, proceed to diagnosis of the RKE system.
3. If the power lock system functions with the RKE transmitter, but not with the power lock switch, proceed to diagnosis of the door lock switch.
4. If only one power lock motor fails to operate with the power lock switch and the RKE transmitter, proceed to diagnosis of the power lock motor.

REMOTE KEYLESS ENTRY SYSTEM

Following are tests that may help to diagnose the Remote Keyless Entry (RKE) system. However, these tests may not prove conclusive in the diagnosis of this system. The most reliable, efficient, and accurate means to diagnose the RKE system requires the use of a diagnostic scan tool and the appropriate diagnostic information. The diagnostic scan tool can provide confirmation that the Body Control Module (BCM) is being sent the proper Radio Frequency (RF) signals by the RKE transmitters to perform its RKE system functions.

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.

PRELIMINARY DIAGNOSIS

As a preliminary diagnosis for the RKE system, first confirm that the power lock system operates satisfactorily. If the power lock system fails to operate correctly, repair that problem before attempting to diagnose the RKE system. Next, note the RKE system operation while you perform both the Lock and Unlock functions with the RKE transmitter. Then, proceed as follows:

1. If the power lock system functions with the power lock switch, but not with the RKE transmitter, proceed to diagnosis of the RKE transmitter.
2. If the RKE transmitter checks okay, proceed to diagnosis of the BCM. The use of a diagnostic scan tool and the appropriate diagnostic information are required.