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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 (Lighting System) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. 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/amber indicators for the components listed below turn ON and OFF while commanding the Indicator Dimming ON and OFF with a scan tool.
    • Dome Lamp Defeat Switch Amber LED Indicator
    • Driver Mode Select Switch LED Indicators
    • Lane Departure Switch Amber LED Indicator
    • Parking Assist Switch Amber LED Indicator
    • If the switch backlighting/amber indicators do not turn ON and OFF 

      Refer to Switch Indicator LED Backlighting Malfunction.

    • If the switch backlighting/amber indicators Turn ON and OFF 
  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. All OK.
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