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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Mirror System >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Cover the windshield with a blanket or other suitable item.
  3. Verify the A10 Inside Rearview Mirror face dims when shining a bright light into the rear light sensor
    • If the A10 Inside Rearview Mirror does not dim 

      Refer to Circuit/System Testing - Inside Review Mirror Dimming Inoperative

    • If the A10 Inside Rearview Mirror dims 
  4. Verify the A10 Inside Rearview Mirror face transitions from dim to bright while commanding the Backup Lamps Active and Inactive with a scan tool.
    • If the A10 Inside Rearview Mirror does not transition between dim and bright. 

      Refer to Circuit/System Testing - Day-Night Disable Malfunction

    • If the A10 Inside Rearview Mirror transitions between bright and dim states 
  5. Verify the A9A Outside Rearview Mirror-Driver face dims when shining a bright light into the rear light sensor.
    • If the A9A Outside Rearview Mirror-Driver does not dim 

      Refer to Outside Rearview Mirror Dimming Malfunction.

    • If the A9A Outside Rearview Mirror-Driver dims 
  6. Verify the A9A Outside Rearview Mirror-Driver face transitions from dim to bright while commanding the Backup Lamps Active and Inactive with a scan tool.
    • If the A9A Outside Rearview Mirror-Driver does not transition between bright and dim states  

      Refer to Outside Rearview Mirror Dimming Malfunction.

    • If the A9A Outside Rearview Mirror-Driver transitions between bright and dim states 
  7. All OK.
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