Diagnostic Aids

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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 FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.
The VTD internal diagnostics are not run while the tamper timer is active.