The washer pump runs off the same circuit as the rest of the wiper system. If the wipers work then there should be no problem there. As above can you hear the pump humming whe trying to use the washers? If not then probably the pump or the switch is bad. The switch however does not go bad very often, it is usually the pump. It is a little bit of a pain to remove but remove the pump and just wire it to a battery real quick. If it does not run replace the pump. Usually about 10 - 12 bucks at the super auto parts store. You do not have to remove the wiper motor to do this, it is a little tricky though.