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Wipers and sprayer pump

Tiny
JUSTIN GRAY
  • MEMBER
  • 1997 GMC YUKON
  • 185,000 MILES
The wipers and sprayer do not work. They did and I noticed the sprayer only worked when the wipers worked. If the wiper motor is bad would that cause the sprayer not to work as well? I have replaced the wiper motherboard to no avail.
Saturday, April 29th, 2017 AT 10:24 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
They operate off of same fuse so check to see if getting power to sprayer you need a mechanic to scan for codes to see if it is a bad motor or switch.
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Sunday, April 30th, 2017 AT 8:58 AM
Tiny
JUSTIN GRAY
  • MEMBER
  • 10 POSTS
So if my wiper motor was bad, the spray would still work?
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Sunday, April 30th, 2017 AT 9:07 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It should unless the motor or wiring is bad or the switch as long as fuse is good.
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Sunday, April 30th, 2017 AT 10:44 AM
Tiny
JUSTIN GRAY
  • MEMBER
  • 10 POSTS
Fuse is good. Pump worked great when wipers worked. Both died at the same time. If, and just an if, there is no power to the fuse, would that mean the switch.
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Sunday, April 30th, 2017 AT 10:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Sorry I messed up a little bit on the schematic. The washer goes through the wiper motor if the fuse had no power there would be no power anywhere else to test switch at wiper motor yellow wire will be hot with key on. Then if you turn to low brown wire should get ground so you have to reverse the leads in other words put the ground part of volt meter to wire and positive to ground in order to work the red wire is for washer, but it has to go through module/motor to activate.
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Sunday, April 30th, 2017 AT 1:30 PM
Tiny
JUSTIN GRAY
  • MEMBER
  • 10 POSTS
Okay. I am going to test it Tuesday when I get it back. I was hoping that just the motor is bad and that would cause the sprayer not to work as well. The switch is $200.00 and motor is $5000. Would always prefer the cheaper fix.
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Sunday, April 30th, 2017 AT 1:34 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Wiper motor at rock auto is $146 and they show a module for 36 but I think that is for rear. The module can probably be rebuilt so check into that first at auto parts.
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Sunday, April 30th, 2017 AT 2:28 PM

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