Re: washer fluid pump?
There is just one pump. The direction that the impeller on the pump rotates determines whether fluid is sent to the back or the front.
The first thing I would check is make sure someone didn't leave summer washer fluid in that has now froze up.
If that's not the case, it could be the pump or perhaps the switch. I would think if the wipers are wiping when you try to clean the windshield the switch is fine and would likely swap out the pump. It's not an expensive or difficult thing to replace.