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Home >> Hummer >> 2007 >> H3 Automatic >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Diagnostic Information and Procedures >> Power Mirrors Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the outside rearview mirror switch.
  2. Ignition OFF, test for less than 2 ohms of resistance between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, reconnect the harness connector at the outside rearview mirror switch. Disconnect the harness connector at the inoperative mirror.
  5. Ignition OFF, with the outside rearview mirror switch in the UP position, test for 5 ohms of resistance between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  6. With the outside rearview mirror switch in the DOWN position, test for 5 ohms of resistance between the control circuit terminal 4 and ground.
    • If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  7. With the outside rearview mirror switch in the LEFT position, test for 5 ohms of resistance between the control circuit terminal 1 and ground.
    • If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  8. With the outside rearview mirror switch in the RIGHT position, test for 5 ohms of resistance between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  9. Ignition ON, with the outside rearview mirror switch in the UP position, verify a test lamp illuminates between the control circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  10. Ignition ON, with the outside rearview mirror switch in the DOWN position, verify a test lamp illuminates between the control circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  11. Ignition ON, with the outside rearview mirror switch in the LEFT position, verify a test lamp illuminates between the control circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  12. Ignition ON, with the outside rearview mirror switch in the RIGHT position, verify a test lamp illuminates between the control circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the outside rearview mirror switch.
  13. If all circuits test normal, test or replace the applicable outside rearview mirror motor.
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