Wait, are we talking about the washer pump or the actual wipers . If the wipers go up and down and wipe the window the they are fine. However if the wipers don't move at all from starting position then it could be a possible motor.
On the other hand if the wipers work but you get nothing squirting out when you want to spray the windshield washer fluid then its most likely the windshield washer pump.
Cant decide between 400hp and 500 hp. Just press the button.