Wiper and Washer Systems: Description and Operation

When the ignition switch is in ON (II) or START (III), battery voltage is applied to the windshield wiper/washer switch, and the windshield wiper motor.

Low Speed
When you turn the wiper switch to LO, the wiper motor's low speed winding is grounded through the BLU wire and the LO speed contacts of the wiper switch at G401, and the wipers run at low speed.

Park/OFF
When you turn the wiper switch OFF, the integrated control unit (PARK input) grounds the wiper motor through the BLU/WHT wire. The cam switch on the motor signals the integrated control unit that the wipers are in the PARK position; the control unit then removes ground from the motor, and the wipers stop in the PARK position.

High Speed
When the wiper switch is in HI, the high speed windings of the windshield wiper motor are grounded through the BLU/YEL wire and the HI speed contacts of the wiper switch at G401, and the wipers run at high speed.

Intermittent
When the wiper switch is in INT, battery voltage is applied through the YEL/BLU wire to the integrated control unit (Intermittent wiper ON input). The integrated control unit (Intermittent/Park Wiper Control) grounds the low speed windings of the wiper motor and the wipers make a single sweep every few seconds (See Low Speed above). When the wiper returns to the PARK position, the park switch applies battery voltage through the BLU/WHT wire to the integrated control unit (PARK input), and the wipers stop in the PARK position.

Mist
When you pull the wiper switch down to MIST position, the high speed windings of the wiper motor are grounded through the BLU/YEL wire and the closed contacts of the mist switch at G401, and the wipers make one pass across the windshield at high speed. The Park/OFF function then takes over and the wipers stop in the park position.

Washer
When you pull the wiper switch toward you to turn ON the washer switch, battery voltage is applied to the washer motor. The motor pumps fluid onto the windshield until you release the lever. On models with combined wiper/washer operation (Canada), the integrated control unit (windshield washer ON input) senses power at the BLK/GRN wire terminal and runs the washer motor whenever the wipers run.