I don't know if this is the same thing but i had the same thing happen to a 4 runner I owned one time. I went to clean my windshield and I could hear the pump running but no washer fluid was coming out of the sprayers so I put washer fluid in the resevoir thinking it was empty and the fluid just ran out of the tank. I then removed the tank and checked it out and the pump had a big crack in the side of it. When I went to the dealership to buy a new pump the parts guy said if you let the washer fluid run to almost empty on very cold days or nights there is a risk of the washer fluid freezing and breaking the pump. He said when it is cold make sure your washer fluid is at least half way full.