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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1550 (Lighting System) >> Diagnostic Information and Procedures >> Courtesy Lamps 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. Command the Courtesy Lamps ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states.
    • If the courtesy lamps do not turn ON and OFF when commanded, refer to Courtesy Lamp Malfunction.
  2. Observe the scan tool Driver Door Switch, Driver Door Ajar Sw. parameter while opening and closing the driver door. The reading should change between Active and Inactive.
    • If the Driver Door Ajar Sw. parameter does not change between Active and Inactive, refer to Door Open Switch Malfunction - Front.
  3. Observe the scan tool Passenger Door Switch, Passenger Door Ajar Sw. parameter while opening and closing the front passenger door. The reading should change between Active and Inactive.
    • If the Passenger Door Ajar Sw. parameter does not change between Active and Inactive, refer to Door Open Switch Malfunction - Front.
  4. Observe the scan tool Ctsy. Lamp Actv. Reason parameter while opening and closing each rear door one at a time. The reading should change between Door Open and Door Closed
    • If the Ctsy. Lamp Actv. Reason parameter does not change between Door Open and Door Closed, refer to Door Open Switch Malfunction - Rear.
  5. All doors closed, observe the scan tool Ctsy. Lamp Actv. Reason parameter while turning the dome lamp switch ON and OFF. The reading should change between Off and Manual.
    • If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, refer to Dome/Interior Lamp Switch Malfunction.
  6. All doors closed, observe the scan tool Ctsy. Lamp Actv. Reason parameter while turning the interior lamp defeat switch ON and OFF. The reading should change between Off and Manual Defeat.
    • If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, refer to Dome/Interior Lamp Switch Malfunction.
  7. Turn the individual reading lamps ON and OFF with their respective switches. The reading lamps should turn ON and OFF when changing between the selected states.
    • If any reading lamp does not turn ON and OFF when selected, refer to Reading Lamps Malfunction.
  8. Turn the left and right vanity mirror lamps ON and OFF with their respective switches. The vanity mirror lamps should turn ON and OFF when changing between the selected states.
    • If any reading lamp does not turn ON and OFF when selected, refer to Vanity Mirror Lighting Malfunction.
  9. Command the Courtesy Lamp ON and OFF with a scan tool. Verify the exterior illumination lamps turn ON and OFF.
    • If the exterior illumination lamps do not change between ON and OFF, refer to Outside Rearview Mirror Illumination Malfunction.
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