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Home >> GMC >> 2011 >> Acadia SL, AWD >> 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 Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is rotated.
    • If the reading does not change, refer to Dimmer Switch Malfunction.
  2. Command the Incandescent Dimming to change intensity with the scan tool. The appropriate incandescent lighting items should change in intensity.
    • If any incandescent lighting items do not change in intensity, refer to Interior Backlighting Malfunction.
  3. Command the LED Dimming to change intensity with the scan tool. The appropriate LED dimming items should change in intensity.
    • If any LED lighting items do not change in intensity, refer to Interior Backlighting Malfunction.
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