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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1005 (Mirror Systems) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Inoperative (With RPO DL3/DR4) >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Backup Lamp Supply Voltage 1 1 2 -
Automatic Day/Night Mirror Signal 2 2 1 -
Low Reference - 2 2 -
1. Rearview mirror remains dimmed in reverse
2. Rearview mirror does not dim
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