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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> 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 LED Backlight Dimming Command parameter changes between a high percentage to a low percentage while operating the dimmer switch from high to low.
    • If the parameter does not change 

      Refer to Dimmer Switch Malfunction.

    • If the parameter changes 
  3. Verify the switch backlighting for the components listed below dim from LOW to HIGH while operating the dimmer switch from LOW to HIGH.
    • ECO Switch (with KL9)
    • Lane Departure Switch (with UHX)
    • Park Assist Switch
    • If the switch backlighting does not dim from LOW to HIGH 

      Refer to Switch Indicator LED Backlighting Malfunction.

    • If the switch backlighting dim's from LOW to HIGH 
  4. Verify all backlighting components turn ON and OFF while commanding the LED Backlight Dimming ON and OFF with a scan tool.
    • If all backlighting components do not turn ON and OFF 

      Refer to Interior Backlighting Malfunction.

    • If all backlighting components turn ON and OFF 
  5. Verify the phrase PASSENGER AIR BAG is illuminated on the Passenger Air Bag Disable Indicator.
    • If the phrase PASSENGER AIR BAG is not illuminated 

      Refer to Passenger Air Bag Disable Indicator Backlighting Malfunction.

    • If the phrase PASSENGER AIR BAG is illuminated 
  6. All OK.
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