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 903 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWASHER INOPERATIVE - REARCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Rear Wiper Washer Switch Circuit Test
- Disconnect the rear wiper washer switch pigtail connector.
- Ignition ON, verify that a test lamp illuminates when connected from the switch supply circuit terminal in the harness connector to ground.
- If the test lamp does not illuminate test the switch supply circuit for an open or short to ground. If the circuit tests normal replace the BCM.
- If the circuits test normal replace the rear wiper washer switch.
Rear Washer Pump Circuit Test
- Remove the REAR WASH 15A fuse in the underhood fuse block and connect a fused jumper wire to the washer pump output fuse terminal in the fuse block.
- Verify that the rear washer pump operates when the other end of the fused jumper wire is connected to battery voltage.
- If the washer pump does not operate, test the washer pump control and ground circuits for an open or short to ground. If the circuits test normal replace the rear washer pump.
- Disconnect the underhood fuse block connector C4 and connect a test lamp from the rear washer pump relay control circuit terminal in the harness connector to ground.
- Ignition on, verify that a test lamp illuminates when the rear washer switch is pressed.
- If the test lamp does not illuminate test the relay control circuit for an open or short to ground. If the circuit tests normal replace the rear wiper washer switch.
- If the circuits test normal replace the underhood fuse block.
Rear Wiper Motor Circuit Test
- Disconnect the rear wiper motor connector and connect a test lamp from the rear wiper switch signal circuit terminal in the harness connector to ground.
- Ignition on, verify that the test lamp will illuminate when the WASH switch is pressed.
- If the test lamp does not illuminate test the rear wiper switch signal circuit for an open or short to ground. If the circuit tests normal replace the rear wiper washer switch.
- If the circuits test normal replace the rear wiper motor.
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.