Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2011CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.6 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESCOURTESY LAMPS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L
Circuit/System Verification
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Circuit/System Verification
- Ignition ON, observe the scan tool Driver Door Ajar Sw. and Passenger Door Ajar Sw. parameters while opening and closing each vehicle door. The parameters should change between Door Ajar and Door Closed.
- If the parameter does not change between the selected states, refer to Door Ajar Indicator Malfunction .
- Observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the rear closure door. The parameter should change between Active and Inactive.
- If the parameter does not change between the selected states, refer to Cargo Door Ajar Indicator Malfunction .
- 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 Lamp Switch Malfunction below.
- Command the Courtesy Lamp 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 below.
- 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 Inadvertent Power Courtesy Lamps Malfunction below.
- Turn the left and right sunshade lamps ON and OFF with their respective switches. The sunshade 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 Inadvertent Power Courtesy Lamps Malfunction below.
- Turn the underhood lamp ON and OFF by opening and closing the hood. The underhood lamp should turn ON and OFF when changing between the selected states.
- If the rear compartment courtesy lamp does not turn ON and OFF when selected, refer to Inadvertent Power Courtesy Lamps Malfunction below.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.