Wiper and Washer Systems: Description and Operation

With the ignition switch in RUN or START; battery voltage is applied to the windshield wiper motor, wiper "high" relay coil, wiper "low" relay coil and the wiper intermittent relay coil.


Low Speed


When you turn the windshield wiper/washer switch to LOW, the windshield wiper intermittent relay is energized and the low speed winding of the motor is grounded through the BLU wire, wiper "low" relay, BLU/WHT wire, wiper intermittent relay and BLK wire to G152. The wipers then run at low speed.


High Speed


When you turn the windshield wiper/washer switch to HIGH, the wiper "low" and "high" relays are energized. The high speed winding of the motor is grounded through the BLU/GRN wire, wiper "high" relay and BLK wire to G152. The wipers then run at high speed.


Park and Off


When the windshield wiper/washer switch is turned to OFF, all the relays are de-energized. The low speed winding of the motor is grounded through the BLU wire, wiper "low" relay, BLU/WHT wire, wiper intermittent relay, BLU/WHT wire, and the park switch in the run position. The wipers then run at low speed until they reach the park position. With the park switch in the PARK position, battery voltage is supplied to both sides of the wiper motor low speed winding and the motor stops.


Intermittent


When you turn the windshield wiper/washer switch to INT; battery voltage is supplied through fuse 23 to the integrated control unit INT input. The INT output grounds the low speed winding of the wiper motor, and the wipers make one pass at low speed (see low speed operation). When the wipers return to the park position, the park switch applies battery voltage to the integrated control unit PARK input through the BLU/WHT wire. This tells the integrated control unit that the wipers have parked. The control unit uses this information to start the delay timer. The amount of delay depends on the position you select on the windshield wiper/washer switch. The cycle repeats until you select a different switch position.

Mist


When you push the windshield wiper/washer switch lever down to MIST and release it, the high speed winding of the wiper motor is grounded (see high speed operation) through the MIST contact of the windshield wiper/washer switch to G301 The wipers make one pass at high speed and return to the park position.


Washer


When you pull the windshield wiper/washer switch lever towards you, battery voltage is applied to the washer motor and the WASH input of the integrated control unit through the BLK/YEL wire.The integrated control unit grounds the wiper motor low speed winding (see low speed and intermittent operation). The washer motor then runs, and will continue running for as long as you hold the washer switch on. Once you release the lever, the wipers will make several passes before stopping in PARK.