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.
2008 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 KFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
IMPORTANT:
It is recommended that component testing is performed before circuit testing when diagnosing steering wheel controls.
- Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
- Ignition ON, test for ignition voltage between the ignition circuit terminal 3 and ground.
- If less than the specified value, test the ignition circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
- Test for the 0 volts between the signal circuit terminal 4 and ground.
- If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- Test for ignition voltage between the ignition circuit terminal 3 and the signal circuit terminal 4.
- If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition OFF, disconnect the harness connector C1 at the BCM.
- Test for infinite resistance between the signal circuit terminal 6 and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- If all circuits test normal, test or replace the steering wheel control switch.
Factory Service Tools
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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.
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