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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 184 (Mirror Systems) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Inoperative (With RPO DL3/DR4) >> Circuit/System Verification

Circuit/System Verification

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  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 in Circuit/System Testing .
  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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