Power Lock System Test

The following tests provide a preliminary diagnosis for the power lock system used only on vehicles equipped with a base version of the Central Timer Module (CTM). These tests do not apply to the diagnosis of the power lock system used on vehicles equipped with the optional Remote Keyless Entry (RKE) system, which includes a high-line or premium CTM. (Refer to POWER LOCKS - DIAGNOSIS AND TESTING - POWER LOCK & REMOTE KEYLESS ENTRY SYSTEM).

Preliminary Tests
To begin this test, note the system operation while you actuate both the Lock and Unlock functions with the power lock switches. Then, proceed as follows:
- If the entire power lock system fails to function with both of the power lock switches, check the fused B(+) fuse in the Junction Block (JB). If the fuse is OK, check the ground circuit between the driver side power lock switch and ground (G301). If the ground circuit is OK, proceed to the diagnosis of the power lock motors. (Refer to POWER LOCKS/POWER LOCK MOTOR - DIAGNOSIS AND TESTING).
- If the entire power lock system fails to function with only one of the power lock switches, proceed to diagnosis of the power lock switches. (Refer to POWER LOCKS/POWER LOCK SWITCH - DIAGNOSIS AND TESTING).
- If only one power lock motor fails to operate with both power lock switches, proceed to diagnosis of the power lock motor. (Refer to POWER LOCKS/POWER LOCK MOTOR - DIAGNOSIS AND TESTING).

For addtional testing please refer to Powertrain Management/Computers and Controls/Body Control Module/Testing and Inspection/ Testing and Inspection