Diagnosis Of Washer System - P-Models - GMC G Service Manual

DIAGNOSIS OF WASHER SYSTEM — P-MODELS
PROBLEM
Washers Inoperative 1. Inadequate quantity of washer solution.
2. Hoses damaged or loose.
3. Plugged screen at end of jar cover hose.
4. Loose electrical connection to washer pump
5. Open circuit in feed wire to ratchet relay coil.
6. Wiper switch faulty.
7. Ratchet relay coil defective.
8. Washer nozzles plugged.
9. Ratchet wheel tooth missing.
10. Ratchet pawl spring missing.
11. Faulty pump valve assembly.
Washer Pumps 1. Grounded wire from ratchet relay to switch.
Continuously When 2. Wiper switch faulty.
Wipers Are Operating
3. Ratchet wheel tooth missing.
4. Ratchet wheel dog broken or not contacting
5. Lock-out tang broken or bent on piston actu­
POSSIBLE CAUSE
or wiper switch.
ratchet wheel teeth.
ating plate.
CAB ELECTRICAL 8A-37
CORRECTION
1. Add washer solution.
2. Cut short length off end of hose to insure air
tight connection or replace hose.
3. Clean screen.
4. Check electrical connections and repair if
necessary.
5. Locate open circuit and repair.
6. Replace wiper switch.
7. Replace ratchet relay.
8. Clean washer nozzles.
9. Replace ratchet wheel.
10. Replace ratchet pawl spring.
11. Replace pump valve assembly.
1. Locate grounded wire and repair.
2. Replace wiper switch.
3. Replace ratchet wheel.
4. Replace of repair ratchet wheel dog.
5. Replace piston actuating plate.
GMTB-0894-2L