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Username Post: 2010 GMC Sierra 1500 Washer not working - no power to pump        (Topic#352404)
dep906 
Poster
Posts: 7

Reg: 08-08-18
08-09-18 04:42 AM - Post#2742445    

Been searching for reason washer motor is not getting power. In some internet searches looks like could be wiper pulse board module, though not sure my truck has. Parts store did not show one.
Is there a relay somewhere? Fuse is good. Tank full. Looking for some help troubleshooting. Thanks.



 
dep906 
Poster
Posts: 7

Reg: 08-08-18
08-09-18 07:00 AM - Post#2742463    
    In response to dep906

I found in the electrical manual the washer relay is one of the "non-serviceable" PCB relays internal to the block. I'm assuming internal to the UBEC? Is it possible to remove the circuit board and repair/replace the relay or assorted circuitry?



 
Lorence 
Poster
Posts: 13

Reg: 05-23-17
08-09-18 10:17 AM - Post#2742486    
    In response to dep906

Bad solder joint on the relay pins?

Before changing the relay you have to prove there is power going to the relay contacts and to the coil when the washer is turned on.

Might be easier to wire from a power source on the ignition switch to the pump through a switch mounted somewhere convenient. Fuse it to be safe.



 
dep906 
Poster
Posts: 7

Reg: 08-08-18
08-09-18 11:49 AM - Post#2742495    
    In response to Lorence

Thanks. I thought of that option though wanted to see if I could get at the pcb in the UBEC. I'll confirm its the relay. By the wiring diagram looks like be BCM will output a "low" / ground to the relay coil to energize. I'm sure designed to sink the current than to source it from the BCM.




 
dep906 
Poster
Posts: 7

Reg: 08-08-18
08-09-18 11:53 AM - Post#2742496    
    In response to dep906

I also did see I can buy the whole junction block (UBEC) loaded with relays and fuses for about $90 on eBay. $140 from GM. Just a bit of cash to fix a relay or board issue which I could do if can get at it....and there are like 12 non-serviceable relays in the block. Not the best design.



 
dep906 
Poster
Posts: 7

Reg: 08-08-18
08-21-18 11:00 AM - Post#2743896    
    In response to dep906

Purchased the entire under hood junction block so the non-serviceable relay could get replaced and fixed the problem. Bad Relay - expensive fix. Put in myself so saved labor.



 
someotherguy 
Senior Moderator
Posts: 28799
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
08-21-18 11:17 AM - Post#2743898    
    In response to dep906

How much was that block?!

I'd be tempted to crack the thing open and attempt a repair.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2527
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
08-27-18 06:23 PM - Post#2744626    
    In response to someotherguy

BEen there done that.
Luckily not too horrible to replace.
Not worth repairing as they are cheaply made and likely something else wont work when reassembled.
Does it work now?

Old School GM fan FOREVER


 
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