Operational Check

Remove washer pump cover and reconnect wiring. With wiper switch "OFF" and ignition "ON", actuate wiper-washer system by momentarily grounding washer pump instrument panel switch terminal. Observe if ratchet pawl moves back and forth with motor operating. If pawl is inoperative, check pawl spring. If spring is satisfactory, remove pump and check for a binding condition in cam follower pivot. If ratchet pawl moves back and forth, check ratchet gear for proper rotation. If satisfactory, observe piston movement within housing. Replace piston and pump housing or valve assembly if necessary. If ratchet gear does not rotate, check relay armature leg on ratchet gear ramp. Pawl must engage ratchet gear teeth.