Wiper Will Not Pulse Correctly
- Determine if problem is in wiring, wiper switch or motor. Remove connector from terminals "6" & "7". Remove terminal "6" lead and reinstall connector. Set wiper switch in "DELAY" mode about halfway between "MIN" and "MAX". Turn ignition "ON", if wiper operates correctly in pulse mode, check for a grounded wire from terminal "6" to wiper switch. If wiper runs steady, but will not pulse, continue to step two.
- Determine if problem is an internal ground in motor, pulse relay and/or timing device. Remove washer cover and reconnect all wiring. Disconnect BLACK (cotton braid) lead from override switch. Set wiper switch in "DELAY" mode, ignition "ON", if wiper runs, motor armature circuit is internally grounded. Check for grounded brush lead or BLACK (cotton braid) lead. If wiper fails, problem is in pulse relay, timing device or holding switch. Remove wiper unit from car and proceed to step three.
- Check pulse relay. Disconnect washer pump unit from motor gearbox. Connect a test light in series with a 12V battery between ground and end terminal on relay closest center terminal. If lamp lights, replace pulse relay. If lamp fails, continue to step four.
- Check problem in holding switch or timing device. Leave test lamp and battery connected as in step No. 3, and also connect a jumper between relay center terminal and battery positive terminal. Momentarily bridge across holding switch contacts with a screwdriver and discharge capacitor. Then manually rotate washer pump drive cam counterclockwise. Observe if switch contacts open and close and if lamp lights when contacts close. Contacts open and close, but lamp stays on, replace timing device. Contacts do not open and close properly, holding switch is defective or requires adjustment. If lamp fails when contacts are closed, contact continuity is poor, clean and recheck.