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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 307 (Mirror System) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Malfunction (Without RPO DL3/DR4) >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, headlamps 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.
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