Front windshield washer pump not working

DAVE742X

MEMBER
2017 GMC ACADIA
3.6L
6 CYL
40,000 MILES

No power to front washer pump. The fuse is good. Pump bench tested and is good. Where else should I look? Fuse is good bench tested and pump works no power to pump.

Saturday, April 18th, 2020 AT 2:26 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

There is a washer pump motor relay (k6) that needs to be checked. here is a guide to help you with the relay location and the washer wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Make sure there is power at fuse #20 as well. Here are the fuse panel and relay locations Check out the diagrams (below). Please let us know what you find.

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Saturday, April 18th, 2020 AT 6:57 PM

DAVE742X

MEMBER
3 POSTS

Hi Ken, the relay checked out okay, fuse still good. I pulled the washer assembly switch out of the steering column, very difficult to check the voltage with a test light. Plugs are tight. What should I be getting for a reading if all is good? I used battery voltage to bench test pump and it worked, but was wondering if the voltage at the switch should be 12?

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Wednesday, April 22nd, 2020 AT 7:08 AM

DAVE742X

MEMBER
3 POSTS

I was wondering about the BCM I guess I answered my voltage question, I am thinking wiper switch in the steering column. I think BCM would have more issues than just washer pump. Any other ideas Ken would be great. Your diagrams were you sent were great!

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Thursday, April 23rd, 2020 AT 4:34 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Sorry for the slow response. There will not be 12 volts at the switch it is a low voltage system which controls the BCM which in turn gives 12 volts to the motor. The best you can do with the switch is make sure there is continuity when the switch is on. If so I would replace the BCM here are the instructions in the diagrams below. Check out the diagrams (below). Please let us know what happens.

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