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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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.

    • Go to next step: If the parameter changes 
  3. Verify the switch indictor amber LED's for the components listed below turn ON and OFF while turning the associated switches ON and OFF.
    • S48D Multifunction Switch 2 - Instrument Panel Park Assist Switch
    • S48D Multifunction Switch 2 - Instrument Panel Lane Departure Switch
    • If any of the switch indicator amber LED's do not turn ON and OFF 

      Refer to Switch Indicator LED Backlighting Malfunction.

    • Go to next step: If all switch indicator amber LED's turn ON and OFF 
  4. Verify the backlighting components turn ON and OFF while commanding the LED Backlight Dimming ON and OFF with a scan tool.
    • If the backlighting components do not turn ON and OFF 

      Refer to Interior Backlighting Malfunction.

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