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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Lighting System) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Verification

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool LED Backlight Dimming 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 under 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 under Circuit/System Testing .
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