Diagnostic Starting Point - Retained Accessory Power
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.
Begin the system diagnosis with the DIAGNOSTIC SYSTEM CHECK - RETAINED ACCESSORY POWER . The Diagnostic System Check will provide the following information:
- Class 2 communication status
- "U" codes which indicate module communication or circuit failure
- "B" codes which indicate a possible body function or circuit failure
- The status of any "U" or "B" codes