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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 888 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirrors Inoperative (without RPO AN3) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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 B 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 B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the B+ circuit fuse is open, test the B+ circuit and each of the mirror position control circuits for a short to ground.
  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 6 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 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.
  7. With the outside rearview mirror switch in the LEFT position, test for 5 ohms of resistance between the control circuit terminal 6 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 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.
  10. Ignition ON, with the outside rearview mirror switch in the DOWN position, verify a test lamp illuminates between the control circuit terminal 6 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 6 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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