With my 2003 BMW it turned out not to be the pump or associated electronics ... but the tubing going from the pump to the nozzles. Over time it had gotten totally squashed ... under some wrapping ... so the collapse/twist of the tubing was not easily seen.
A symptom was that the flow had slowly decreased with time ... but it went from 50% to zero quickly.
I took all the tube runs apart .. after testing the pump with a short run of new tubing to confirm it was not the pump (which I also replaced). Both pumps worked fine.
Sometimes the nozzles get plugged too ... remove the tubing from the nozzle and see if there is any flow when pump is activated.
My tubing issue had me stymied a long time ...
Testimonial: "I Had checked the lines for trash, before I started started the rest of the process.."
After a web search I saw where this vehicle had a recall on the heated windshield fluid unit ... you might check that fuse (although I am not sure if it is in the same wiring of the washer pump) ... it is a j-case fuse in the under hood fuse/relay box
http://www.autogenius.info/gmc-acadia-20...
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My personal suggestion would be to go for these repair catalogs. I know this website www.reliable-store that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.
SOURCE: Windshield washer fluid pump quit. 2005 Jetta
I have a 2003 Jetta and the fuse box is between the dashboard and the drivers side door. There is a lid that covers it on the dashboard side. Inside there is a diagram/fuse card. The card has one top rectangular series of fuses numbered 8 through 23. Below is a square series numbered 24 through 44. The washer fuse is number 24 on the top left of the bottom square series. For me, I checked the fuse and it was good, therefore I am assuming that my pump is dead.
SOURCE: 1998 ford expedition front windshield washer
fuse for washer pump, can you here the pump, if not then power to pump isn't present. Check the fuse for it.
SOURCE: Which fuse runs the windshield washer pump on 98 Toyota Corolla?
it could be powered thru a relay
My database only shows one wiper motor. Did you check voltage and ground, anywhere? Check the wiper fuse for voltage, hot all the time, use test light. At the wiper motor, dark green wire is voltage for lo speed. The purple wire is voltage for hi speed, Turn on key, turn on wiper switch, probe those two wires for voltage, use a test light. That bottom black wire off wiper motor, in diagram, is ground, check that also. If good voltage and ground with no wiper action, I suspect the wiper motor. There are codes for wiper, manufacturer codes, check for codes. good luck
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