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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1624 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWINDSHIELD WIPER SYSTEM MALFUNCTIONCIRCUIT/SYSTEM TESTINGWIPER SPEED RELAY CONTROL CIRCUIT TEST
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Wiper Speed Relay Control Circuit Test
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Wiper Speed Relay Control Circuit Test
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X5 harness connector at the BCM.
- Install a 10A fused jumper wire between B+ and the WIPER CONTROL relay control circuit terminal 20.
- Ignition ON, verify that the high speed wipers are not on.
- If the high speed wipers are on, test the WIPER SPEED relay control circuit terminal 21 for a short to ground. If the circuit tests normal, replace the underhood fuse block.
- Install a 10A fused jumper wire between the WIPER SPEED relay control circuit terminal 21 and ground. Verify the high speed wipers are on.
- If the high speed wipers are not on, test the relay control circuit for an open/high resistance or short to voltage. If the circuit tests normal replace the underhood fuse block.
- If all circuits test normal, replace the BCM.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.