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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 871 (WIPER SYSTEM AND WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3715CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
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- Ignition OFF, disconnect the X5 harness connector at the BCM.
- Ignition ON, verify that the low speed wipers are not on.
- If the low speed wipers are on, test the WIPER 1 relay control circuit terminal 20 for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
- Install a 10A fused jumper wire between the WIPER 1 relay control circuit terminal 20 and B+. Verify the low speed wipers are on.
- If the low speed wipers are not on, test the relay control circuit for an open/high resistance or short to ground. If the circuit tests normal replace the underhood fuse block.
- If all circuits test normal, replace the BCM.
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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.