Wiper and Washer Systems: Description and Operation

With the ignition switch in ON or START, battery voltage is applied to the windshield wiper/washer switch, windshield wiper motor, and windshield intermittent wiper relay through fuse C-5.

Low Speed
When the wiper switch is moved to LO, battery voltage is applied to the LO winding of the wiper motor, and the wipers run at low speed.

Park/Run
When the wiper switch is turned to OFF, battery voltage is provided through fuse C-5, the wiper motor, intermittent wiper relay, and the wiper switch to the LO winding of the wiper motor. When the switch on the motor reaches the PARK position, battery voltage is removed from the circuit and the wipers stop in the PARK position.

High Speed
When the wiper switch is in HI, battery voltage is applied to the HI winding of the wiper motor, and the wipers run at high speed.

Intermittent
When you turn the wiper switch to INT, battery voltage is applied to the intermittent wiper relay. The intermittent wiper relay momentarily energizes every 3 to 4 seconds or a variable time of every 2 to 20 seconds (depending on intermittent switch position) and applies battery voltage to the LO winding of the wiper motor. The wipers then move from the PARK position to the RUN Position, and the PARK/RUN function takes over to eventually return the wipers to the PARK Position when you turn the wiper switch OFF.

Washer
When you press the windshield washer switch battery voltage is applied to the windshield washer motor and to the intermittent wiper relay. The washer motor pumps fluid on to the windshield and the intermittent wiper relay energizes and applies battery voltage to the LO winding of the wiper motor through the wiper switch. The wipers will run at LO speed until you release the switch.