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 188 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWINDSHIELD WIPER SYSTEM MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Verification
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
BCM and Wiper Switch Verification
- Ignition ON, observe the scan tool Windshield Wiper Switch and the Wiper Delay Setting parameters. The Windshield Wiper Switch reading should display Off, Intermittent and Low and the Wiper Delay Setting should display 0-5 while rotating the wiper switch through each delay setting to the low position.
- If one or more of the Wiper Delay Setting parameters are inoperative and the Windshield Wiper Switch low speed parameter functions, replace the turn signal/multifunction switch.
- If the low speed parameter is inoperative, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.
- With the wiper switch in the HIGH speed mode, observe the scan tool Wiper High Speed Switch parameter. The Wiper High Speed Switch reading should be Active.
- If not Active, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.
- Observe the scan tool BCM Wiper Park Switch parameter. The reading should display Active when the wipers are parked and Inactive with the wipers ON or out of the park position.
- If the Wiper Park Switch parameter is always Active or Inactive, perform the Wipers do not Park Circuit/System Testing.
- If all wiper position parameters displayed correctly on the scan tool, perform the Wiper Motor Circuit/System Testing and/or the Wiper Motor Component Test.
BCM and Wiper Motor Verification
- Command the windshield wiper motor to the off, low speed and high speed modes with a scan tool. Before commanding the wiper high speed mode, place the wiper switch in the low speed position. The wipers should perform the commanded state.
- If one or more of the commanded states do not work, perform the Wiper Motor tests in Circuit/System Testing and/or Component test.
- If all the wiper motor speeds function, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.
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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.