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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Lighting Systems) >> Diagnostic Information and Procedures >> Vanity Mirror Lamp Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at an affected vanity mirror lamp.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the inadvertent power supply circuit terminal A and ground.
    • If the test lamp does not illuminate, test the inadvertent power supply circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
  4. Connect the harness connector at the vanity mirror lamp, and remove the vanity lamp bulb.
  5. Connect a test lamp across the bulb terminals
  6. Ignition ON, open and close the vanity mirror. The test lamp should turn on and off when changing between the commanded states.
    • If the test lamp is always on, replace the affected vanity mirror lamp.
    • If the test lamp is always off, replace the affected vanity mirror lamp.
  7. If all circuits test normal, test or replace the affected vanity lamp bulb.
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