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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISWIPER AND WASHER SYSTEMSWINDSHIELD WASHER SWITCHTESTING AND INSPECTIONFRONTWIPER/WASHER SWITCH TEST
1990 Chevrolet Lumina APV V6-191 3.1L
Wiper/Washer Switch Test
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Wiper/Washer Switch Test
Wiper/Washer Circuit Diagram:
(Figure 1) Wiper/Washer Switch Tests:
(Figure 4) Wiper/Washer Motor Tester (J-38136):
Wiper Off-Vehicle Checks:
Wiper/Washer Switch Tests
Check wiper/washer switch operation before removing modular wiper/washer assembly from vehicle.
1. At fire wall, remove retaining clip to free wiper motor wiring harness, then disconnect wiring harness from wiper motor. Pull wiring harness toward front of vehicle for access. Perform the switch tests outlined. Use a digital voltmeter to probe harness connector terminals with ignition switch on.
NOTE: A wiper/washer motor tester J-38136 is available for on-vehicle service testing.
2. If switch is OK, remove complete module from vehicle and perform the wiper off-vehicle checks.
RENDER: 1.0x
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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.