Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Prior to replacing a BCM, ensure that all of the diagnostics have been completed. Refer to DIAGNOSTIC TROUBLE CODE (DTC) LIST .
- Inspect the Passlock™ sensor harness for intermittent or poor connections. Refer to TESTING WIRING SYSTEMS FOR INTERMITTENT & POOR CONNECTIONS in Wiring Systems.