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.

The automatic day-night feature of the inside rearview mirror may not operate properly or become inoperative due to an intermittent short to battery voltage in the backup lighting system.

Fig 1: Mirrors - Automatic Day-Night Inoperative - Diagnostic Specifications (Step 1-9)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Mirrors - Automatic Day-Night Inoperative - Diagnostic Specifications (Step 10-12)

Courtesy of GENERAL MOTORS CORP.