Diagnostic Starting Point - Retained Accessory Power
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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:
- The identification of the control module which commands the system
- The ability of the control module to communicate through the serial data circuit
- The identification of any stored DTCs and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.