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Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool Incandescent Dimming Duty Cycle Command parameter while operating the dimmer switch from low to high. The parameter should change from a high percentage to a low percentage when the dimmer switch is moved up and down.
    • If the parameter does not change between the selected states, refer to Dimmer Switch Malfunction in Circuit/System Testing .
  2. Command the LED Backlight Dimming ON and OFF with a scan tool. The LED backlighting components should turn ON and OFF when changing between the commanded states.
    • If the LED backlighting components do not change between the commanded states, refer to Interior Backlighting Malfunction Circuit/System Testing .
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