Diagnostic Starting Point - Retained Accessory Power
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Begin the system diagnosis with Diagnostic System Check - Retained Accessory Power . The Diagnostic System Check will provide the following information:
- Class 2 communications 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