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 1224 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESPARK LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Park Lamps Inoperative From BCM
- Ignition OFF, disconnect the PRK LAMPS relay.
- Ignition ON, verify that a test lamp illuminates between the relay switch B+ circuit and ground.
- If the test lamp does not illuminate, replace the rear fuse block.
- Test the relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PRK LAMPS relay.
Park Lamps Always On From Relay
- Ignition OFF, disconnect the PRK LAMPS relay.
- Ignition ON, verify that the park lamps are not illuminated.
- If the park lamps are illuminated, test the relay controlled output circuit for a short to voltage.
- If all circuits test normal, replace the PRK LAMPS relay.
Park Lamps Inoperative From Switch
- Disconnect the X1 harness connector at the turn signal/multifunction switch.
- Install a 3A fused jumper wire between the park lamp switch signal circuit terminal 3 and ground. Verify the scan tool Park Lamp Switch parameter is Active.
- If not the specified value, test the signal circuit terminal 3 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- Test the signal circuit terminal 3 for a short to ground. If all circuits test normal, replace the turn signal/multifunction switch.
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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.