Front Wipers are not working?

2004 GMC ENVOY

225,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC

SWEETIE1965

MEMBER
181 POSTS
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I have changed my front wiper motor two times in about 6 months because they stop working when I need them to work. I have checked fuses they are good. I can't find a relay for them. I have read the computer board inside of the motor can go bad. I can't purchase just the computer board. Wiring looks to be okay. I need to repair this as soon as possible because of a lot of rain will be headed our way in a few days. So please guide me in the right direction. Thank you for your time.

Apr 23, 2025 at 11:34 AM

STEVE W.

✓ASE Certified Mechanic
15,172 POSTS

Okay, if replacing the motor works for a bit and then it stops the likely issue is a bad connection or connector itself. They are known to develop a bad ground because the ground connector corrodes where it attaches to the body near the bulkhead connector.
That is the black wire that is in the connector on the wiper motor. If it has a problem now you can test the ground simply by jumping that terminal to battery negative. Attached is the wiring diagram. The other problem area is the pins in the connector heating up and not connecting very well. Those can be tightened up by squeezing the female side barrel.

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Apr 23, 2025 at 9:52 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.