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 switches and with the Remote Keyless Entry FOBIK transmitter. Then, proceed as follows:

• If the entire power lock system fails to function with either the power lock switches or the FOBIK, check the fused B(+) fuse in the Totally Integrated Power Module (TIPM).
• If the power lock system functions with both power lock switches, but not with the FOBIK, proceed to diagnosis of the Remote Keyless Entry (RKE) system. Refer to TRANSMITTER, Integrated Key FOB , Diagnosis and Testing  and Diagnosis and Testing .
• If the power lock system functions with the FOBIK, but not with one or both power lock switches, proceed to diagnosis of the door lock switches. Refer to Diagnosis and Testing .
• If the driver side power lock switch operates only the driver side front door power lock motor, but all other power lock motors operate with the passenger side power lock switch or the FOBIK, use a scan tool and the appropriate diagnostic information to diagnose the CAN data bus.