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 406 (WIPER SYSTEM AND WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWINDSHIELD WIPER SYSTEM MALFUNCTIONCOMPONENT TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Component Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Component Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Multifunction Switch
- With the ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Test the resistance between terminals H and L. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed.
- If the resistance is not within the specified range, replace the turn signal/multifunction switch.
- Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- If the less than infinite, replace the turn signal/multifunction switch.
- Test for less than 5 ohms of resistance with the wiper switch in the High speed position.
- If greater than 5 ohms, replace the turn signal/multifunction switch.
- Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- If less than infinite, replace the turn signal/multifunction switch.
- Test for less than 5 ohms of resistance while pressing the WASHER switch.
- If greater than 5 ohms, replace the turn signal/multifunction switch.
IMPORTANT:
If the switch tests open in any switch position other than Off, test the wiper/washer switch signal circuits for a short to voltage before replacing the switch.
Wiper Switch Values
| Switch Position | Resistance |
|---|---|
| Off | Infinite |
| Mist | 300-364 Ξ© |
| Delay 1 | 3.48K-4.25K Ξ© |
| Delay 2 | 2.52K-3.08K Ξ© |
| Delay 3 | 1.78K-2.18K Ξ© |
| Delay 4 | 1.17K-1.44K Ξ© |
| Delay 5 | 697-851 Ξ© |
| Low | 300-364 Ξ© |
Windshield Wiper Motor Dynamic Test
- Ignition OFF, disconnect the harness connector at the windshield wiper motor.
- Install a 25A fused jumper wire between the control terminal B and 12 volts. Install a jumper wire between the ground terminal A and ground.
- The wiper motor should be in low speed mode.
- If the wiper motor is not in the low speed mode replace the motor.
- Install a 25A fused jumper wire between the control terminal A and 12 volts. Install a jumper wire between the ground terminal D and ground.
- The wiper motor should be in the high speed mode.
- If the wiper motor is not in the high speed mode replace the motor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.