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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 Malfunction (With A45) >> Circuit/System Verification

Circuit/System Verification

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.
  1. Ignition ON.
  2. Verify the scan tool Mirror Select Switch parameter changes from None to Left and Right when cycling the S52 Outside Rearview Mirror Switch.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Outside Rearview Mirror Switch Malfunction.

    • If the parameter changes 
  3. Verify the scan tool Mirror Direction Switch parameter changes from Inactive to Up, Down, Right and Left when cycling the S52 Outside Rearview Mirror Switch.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Outside Rearview Mirror Switch Malfunction.

    • If the parameter changes 
  4. Verify the A9A Outside Rearview Mirror-Driver moves when commanding the Driver Mirror Horizontal Movement Right/Left and Driver Mirror Vertical Movement Up/Down with a scan tool.
    • If the A9A Outside Rearview Mirror-Driver does not move RIGHT or LEFT or UP or DOWN 

      Refer to Circuit/System Testing - Driver Outside Mirror Movement Malfunction.

    • If the A9A Outside Rearview Mirror-Driver moves RIGHT, LEFT, UP and DOWN 
  5. Verify the scan tool Driver Mirror Vertical Position parameters are between 0.2-4.8 V and change when commanding the Driver Mirror Vertical Movement Up/Down with a scan tool.
    • If not between 0.2-4.8 V or does not change 

      Refer to Circuit/System Testing - Driver Mirror Position Sensor Circuit Test.

    • If between 0.2-4.8 V and changes 
  6. Verify the scan tool Driver Mirror Horizontal Position parameters are between 0.2-4.8 V and change when commanding the Driver Mirror Horizontal Movement Right/Left with a scan tool.
    • If not between 0.2-4.8 V or does not change 

      Refer to Circuit/System Testing - Driver Mirror Position Sensor Circuit Test.

    • If between 0.2-4.8 V and changes 
  7. Verify the A9B Outside Rearview Mirror-Passenger moves when commanding the Passenger Mirror Horizontal Movement Right/Left and Passenger Mirror Vertical Movement Up/Down with a scan tool.
    • If the A9B Outside Rearview Mirror-Passenger does not move RIGHT or LEFT or UP or DOWN 

      Refer to Circuit/System Testing - Passenger Outside Mirror Movement Malfunction.

    • If the A9B Outside Rearview Mirror-Passenger moves RIGHT, LEFT, UP and DOWN 
  8. Verify the scan tool Passenger Mirror Vertical Position parameters are between 0.2-4.8 V and change while commanding the Passenger Mirror Horizontal Movement Right/Left with a scan tool.
    • If not between 0.2-4.8 V or does not change 

      Refer to Circuit/System Testing - Passenger Mirror Position Sensor Circuit Test.

    • If between 0.2-4.8 V and changes 
  9. Verify the scan tool Passenger Mirror Horizontal Position parameters are between 0.2-4.8 V and change while commanding the Passenger Mirror Vertical Movement Up/Down with a scan tool.
    • If not between 0.2-4.8 V or does not change 

      Refer to Circuit/System Testing - Passenger Mirror Position Sensor Circuit Test.

    • If between 0.2-4.8 V and changes 
  10. Verify the A9A Outside Rearview Mirror-Driver and A9B Outside Rearview Mirror-Passenger adjust to the stored memory positions when operating the S47D Driver Seat Memory Switch.
    • If the A9A Outside Rearview Mirror-Driver and A9B Outside Rearview Mirror-Passenger adjust to the stored memory positions 
  11. All OK.
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