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 MANUALSGMC2009SAVANA G2500, VAN CARGO EXTENDED, 6.6 6REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTEXTERIOR LIGHTSLIGHTING SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3600CIRCUIT/SYSTEM TESTING
2009 GMC Savana G2500, Van Cargo Extended, 6.6 6
Circuit/System Testing
2009 GMC Savana G2500, Van Cargo Extended, 6.6 6SECTION Circuit/System Testing
- 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.