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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 256 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirror Folding Malfunction (With A45) >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Outside Rearview Mirror

  1. Ignition OFF, disconnect the harness connector at the appropriate A9 Outside Rearview Mirror.
  2. Install a 10 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A9 Outside Rearview Mirror should perform the FOLD and UNFOLD functions.
    • If the function does not perform the FOLD and UNFOLD functions 

      Replace the A9 Outside Rearview Mirror.

    • If the function performs the FOLD and UNFOLD functions 
  3. All OK