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 1832 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3600CIRCUIT/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 does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3 harness connector at the BCM.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open high/resistance.
- Ignition OFF, connect the X3 harness connector at the BCM and disconnect the harness connector at the headlamp switch.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 15 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the BCM.
- Verify the scan tool Dimming Control Signal parameter is less than 0.2 volts.
- If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM
- Install a 3A fused jumper wire between the signal circuit terminal 13 and the B+ circuit terminal 15. Verify the scan tool Dimming Control Signal parameter is greater than 2.75 volts.
- If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition OFF, disconnect the harness connector at the stop lamp switch.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal C and ground.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
- Install a 3A fused jumper wire between the signal circuit terminal D and the B+ circuit terminal C. Verify the scan tool Stop Lamp Switch Status parameter is 1023 Counts.
- If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- If all circuits test normal, replace the headlamp 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.