Washer System Inoperative
- Check for the following: quantity of solution in reservoir, pinched hoses, kinked or damaged hoses, hose attachments to reservoir, pump and nozzles. If hose fit is loose, cut off 1/2" and reattach. Check for plugged screen filter or nozzles. If okay, go to step 2).
- With ignition on, remove connector from washer pump terminals No. 4 and 5. Using test light, ground one lead and probe terminals No. 4 and 5 at connector. If test light is off at both terminals, check for open in feed circuit to washer relay from terminal or motor connector. If test light is on, go to step 3).
- Connect test light to washer terminals No. 4 and 5, then push wash button. If test light is off, check for open in wire to wiper switch or a defective switch. If test light is on, go to step 4).
- Reconnect wiring to terminals No. 4 and 5. Ground test light and touch probe to terminals No. 4 and 5. If test light is off on one terminal, replace washer relay. If test light is on at both terminals, go to step 5).
- Remove washer pump cover. Connect wiring to wiper motor. Operate wipers in low speed. Observe ratchet pawl. If ratchet is not moving, check for cam-follower pin binding. If binding, replace washer pump assembly. If ratchet pawl moves back and forth, go to step 6). See Fig 1
.
Courtesy of GENERAL MOTORS CORP.
- Depress washer button and observe if ratchet gear rotates. If gear rotates, replace valve assembly. If problem still exists, replace piston and pump housing assembly. If gear does not rotate, check for ratchet pawl spring missing or not properly connected, and ratchet dog spring not engaging ratchet gear teeth.