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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1574 (Mirror System) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Malfunction (With RPO DL3/DR4) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. The inside rearview mirror face should dim.
  2. Place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright.
    • If the mirror does not transition between the bright and dim states, refer to Inside Rearview Mirror Dimming Malfunction.
  3. Vehicle in PARK, the outside rearview mirror face should dim.
  4. Place the transmission in REVERSE. The outside rearview mirror face should transition from dim to bright.
    • If the mirror does not transition between the bright and dim states, refer to Outside Rearview Mirror Dimming Malfunction.
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