Wiper and Washer Systems: Description and Operation

Fig. 4 Exploded View Of Windshield Wiper/washer Assembly.:

The front wiper system consists of a permanent magnet positive park pulse wiper, a washer pump mounted on the side of the washer bottle and a turn signal type wiper/washer switch. The die cast aluminum housing of the wiper provides cooling of internal parts and the wiper motor is equipped with radio frequency interference suppression. The wiper motor is protected by an automatic reset type circuit breaker located in the brush holder circuit. A 25 amp Wiper fuse protects the circuit wiring.
An electronic circuit board controls all timing and washer commands, Fig. 4. When the washer button is pushed for more than 1 second, washer solvent is sprayed on the windshield for as long as the button is held, followed by approximately 6 seconds of wiper activity.
Turning the switch to either the Lo or Hi speed position completes the circuit and wipers will run at that speed. The pulse and demand wash functions are controlled by a plug-in printed circuit board enclosed in the wiper housing cover. Turning the switch to the Delay position operates the motor intermittently and the delay can be varied by rotating the switch. An instantaneous wipe can be obtained by rotating the switch to the Mist position and a continuous wipe will be performed if the button is held.