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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X4 harness connector at the appropriate outside rearview mirror.
  2. Ignition OFF, test for less than 1.0 ohm between the control circuit terminal 1 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the appropriate door control module.
  3. Ignition OFF, test for less than 1.0 ohm between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the appropriate door control module.
  4. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
  5. Command the appropriate mirror fold to retract and extend with a scan tool. The test lamp should turn ON when commanding the retract and extend states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the appropriate door control module.
  6. If all circuits test normal, test or replace the appropriate outside rearview mirror.
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