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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1401 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESCOURTESY LAMPS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the scan tool ctsy. lamp actv. reason parameter while pressing and releasing the dome lamp switch. The reading should toggle between OFF and MANUAL.
- If the reading does not change between the commanded states, refer to Dome Lamp Switch Malfunction .
- Observe the scan tool driver door open switch parameter while opening and closing the driver door. The reading should toggle between ACTIVE and INACTIVE.
- If the reading does not change between the commanded states, refer to Door Courtesy Lamp Malfunction - Front .
- Observe the scan tool passenger door open switch parameter while opening and closing the passenger door. The reading should toggle between ACTIVE and INACTIVE.
- If the reading does not change between the commanded states, refer to Door Courtesy Lamp Malfunction - Front Door Open Switch Malfunction - Front.
- Open each rear door one at a time and observe the courtesy lamps. The courtesy lamps should illuminated when each rear door is opened.
- If the courtesy lamps do not illuminate as each rear door is opened, refer to Door Courtesy Lamp Malfunction - Rear .
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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.