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There are two relay's in the under hood fuse / relay box . Wiper relay an wiper relay 2 . Maybe one is bad . also check fuse #14 25 amp. Wiper fuse.Plus the BCM - body control module has a hand in making the wipers work . Are you familiar with automotive electronic control modules ?
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper micro relay
• Wiper 2 relay
• Wiper diode
• Windshield wiper motor
• Windshield washer pump
• Windshield washer nozzles
• Windshield washer solvent container
• Windshield wiper arm and blade assemblies
• Windshield wiper transmission
• WIP/WASH 10A fuse
• WIPER 25A fuse
Wiper/Washer System Description
The body control module (BCM) controls wiper motor low speed operation. The washer pump and high speed operation are controlled directly by the wiper/washer switch. The windshield wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield wiper/washer operation. When WASH, MIST, DELAY, LOW, or HIGH is detected, the BCM energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage from the WIPER fuse to flow through the relay switched input then through the contacts and out the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor will operate at low speed.
I think it is located on the firewall on the passenger side of the vehicle. It is directly below thae passengerside windshield wiper. Look for a plasctic cover with writing on the top such as "Power block" or "Fuel pump relay" or "Fuel pump Fuse
there is a fuse for the windshield washer pump. It is located in the under the hood fuse box.The fuse is near the bottom marked WSW. Look in the manual for fuse box (under hood) I read that Chevy recommended repacing the 10 amp fuse with a 15amp. There are spare fuses in the bottom of the fuse box(labeled in the manual) and there is a 15 amp. I changed mine in 3 minutes and now it works. Hope I helped.
The pump is located inside of the fluid holding tank itself. I would suggest checking the 30 amp (pink) fuse for the windshield washer pump before attempting to replace the pump. The fuse is located in engine compartment distribution block. Find the location of the 30 amp fuse by looking in your car's manual. If the fuse looks fine try swapping it out with an identical 30 amp fuse from the distribution block and trying the washers again. I believe there is one other 30 amp fuse (possibly for the headlights?) in that same location.
Replacement (if necessary) is no easy task as it would require removing quite a few parts of the front fascia of the vehicle including the front bumper and possibly passenger's side fender.
May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.
The windshield washer pump is part of the windshield wash reservior.
There is an electrical connector located on the bottom of the reservior.
That is the pump .
If the pump is not in the reservior. I would just trace the washer fluid lines from the sprayer on the vehicle back to the pump. The lines just might lead back to the reservior for the windshield wash solution. Then you will have confirmed the pump is in the reservior.
You may have to get a new reservior. The pump might not be seperate item, I am not 100% sure on that.
I also would double check the fuses and any relays related to the washer pump.
Finally, I would check the washer switch if you replace the pump and still is not working .
Where is the windshield washer pump located on a 2003 Sierra
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