Front windshield washer won't work. Full of fluid.

There is a electric motor that pumps washer fluid . Located in the bottom of the washer fluid tank .
Wash Operation (Front and Rear Wipers)
The front and rear washer systems use the same windshield washer fluid pump. When either the front or rear wiper is in the washer position voltage will be supplied to one side of the windshield washer fluid pump (depending on whether it is front or rear), while the other side of the pump is grounded.
At this point, the windshield washer fluid pump sprays solvent onto the windshield. When the front or rear washer is activated, the BCM receives an input from the switch that is activated. The BCM will control the wipers while in the WASH mode. The BCM will control either the front wiper relay or the rear wiper relay to turn on the wipers. The windshield wipers operate at low speed for 3 swipes and returns to the park position.

When turning on the washers do you hear the motor run ? Have some one try it while you listen at the washer fluid tank ! These pump motors do go bad .
turn OFF the ignition.
Disconnect the harness electrical connector of the windshield washer fluid pump.
Connect a test lamp from the windshield washer pump control circuit to a good ground .
Turn ON the ignition, with the engine OFF.
Press the front washer switch.
Does the test lamp illuminate?
YES or NO !

GMC Acadia Forum: Front washer fluid not working. Help?

www.acadiaforum.net > ... > Problems, Recalls, TSBs, FAQs & Links

Dec 3, 2010 - 17 posts - ‎12 authors
I had my 2007 Acadia in for the heated washer fluid recall a few months ago. ... bad in the Midwest, I just noticed the front washer fluid not working. ..... the fuse finally seated properly and my windshield washer now works. Front Windshield Washer Spray
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When the temperature gets below freezing and you use a bargain windshield washer fluid or plain water, it freezes and won't work. I normally drain every drop, not just add to what's already in there, and refill with Prestone yellow windshied washer fluid that has a lower freezing point.etort

I would check the washer pump to see if it is working assuming the tank is full of fluid.

The seam on the windshield fluid container is broken and leaking like crazy.

That sensor can be replaced. It's located on the washer fluid bottle which is found behind the front bumper and next to the passenger's fender.

Probably need to replace the pump. Separate pumps for front and rear. Check with a test light to see if there is power to the pump. If it has power but won't work, replace the pump. If no power, you have a wiring issue. Be sure to turn the switch on and have someone push the washer button when you are checking for power. There won't be any until you push it to "wash".

the washer pipe will have blown appart.this happens if you opperate the rear washer when it is frozen.it will either be off in the tailgate usually when this happens there is water around the catch when you open the tailgate.or in the headlining in the left rear,have a feel and see if the headlining is wet.to avoid this reoccuring use a good screenwash with frost protection.