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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Mirror System) >> Diagnostic Information and Procedures >> DTC B1640 or B1645 >> Circuit/System Testing

Circuit/System Testing

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  1. Disconnect the power mirror connector at the door switch and clear the DTC.
  2. Ignition ON, verify that the DTC does not reset when the rear defroster switch is activated.
    • If the DTC resets, replace the door switch.
  3. Disconnect the mirror face electrical terminals and test the mirror heater control circuit for a short to voltage or ground.
  4. If the circuits test normal, replace the mirror face.
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