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Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the driver outside rearview mirror.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal G.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
  3. Ignition ON, test for less than 1 volt between the control circuit terminal D and ground.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the inside rearview mirror.
  4. Headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor. Test for greater than 1 volt between the signal circuit terminal D and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
  5. If all circuits test normal, test or replace the driver outside rearview mirror face.
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