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Home >> Cadillac >> 2018 >> XT5 Platinum >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting System - Diagnostic Information And Procedures (DTC B3950 - C0297) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

  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.

    • Go to next step: If the parameter changes 
  3. Verify the switch backlighting/amber indicators for the components listed below dim from LOW to HIGH while operating the dimmer switch from LOW to HIGH.
    • AWD Switch Amber LED Indicator
    • Dome Lamp Cancel Switch Amber LED Indicator
    • Driver Mode Select Switch Amber LED Indicator
    • Hazard Switch Backlighting
    • Park Assist Switch Amber LED Indicator
    • If the switch backlighting/amber indicators do not dim from LOW to HIGH 

      Refer to Switch Indicator LED Backlighting Malfunction.

    • Go to next step: If the switch backlighting/amber indicators dim 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.

    • Go to next step: If all backlighting components turn ON and OFF 
  5. All OK.
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