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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1548 (Lighting System) >> Diagnostic Information and Procedures >> Door Sill Illumination Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Observe the vehicle entry courtesy lamps while opening and closing the driver door. The entry courtesy lamps should turn ON the door is opened and OFF when the door is closed.
  2. Observe the door sill plate lamps while opening and closing the driver door. The door sill plate lamps should turn ON when the door is opened and turn OFF when the door is closed.
    • If a single door sill plate lamp does not change between the selected states, replace the appropriate door sill plate lamp component.
    • If all of the door sill plate lamps do not change between the selected states, refer to Circuit/System Testing.
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