The pulse-type windshield wiper is powered by a two-speed windshield wiper motor. The windshield wiper switch on the multifunction switch controls the motor. In the HIGH mode, the windshield wiper motor operates at high speed without any delay after the end of a wipe cycle. When the multifunction switch is in any other mode, the motor operates at low speed. However, a variable delay time between wipe cycles reduces the wipe frequency. The solid state logic of the windshield wiper switch determines the variable delay. The solid state logic also contains logic which will return the wipers to the parked position after the windshield washer switch moves to the OFF position.

Circuit Breaker 21 supplies voltage at all times to the windshield wiper motor and the windshield washer pump motor through CKT 452 (BLU/RED). Circuit Breaker 6 supplies voltage to the windshield wiper switch whenever the ignition switch is in the RUN or the START position through CKT 371 (BRN).

When the windshield washer switch is pressed, the windshield washer pump motor is grounded through the closed contacts of the windshield wiper switch to G105. The windshield washer pump operates as long as the washer switch is pressed. Depressing the washer switch will also initiate operation of the wipers. When the washer switch is depressed, voltage is switched through the internal circuitry of the windshield wiper switch from the LOW side of the windshield wiper motor to G105. The wipers will operate until the washer switch is released. As the motor turns, the windshield wiper motor pawl and switch engages and turns along with the motor. The pawl and switch remains closed for one wipe cycle. If the switch is closed, battery voltage is applied to the interval relay at the windshield wiper switch.

If the windshield wiper switch is in the LO position, battery voltage is applied through circuit breaker 21 to the LOW winding of the windshield wiper motor and then to the LOW side of the windshield wiper switch. The internal circuitry of the windshield wiper switch then switches the voltage to G105. Since the windshield wiper motor grounds permanently at G105, the motor operates at low speed as long as the switch remains in the LO position.

If the windshield wiper switch is in the HI position, battery voltage is applied through circuit breaker 21 to the HIGH winding of the windshield wiper motor and then to the HIGH side of the windshield wiper switch. The internal circuitry of the windshield wiper switch then switches the voltage to G105. Since the windshield wiper motor grounds permanently at G105, the motor operates at high speed as long as the switch remains in the HIGH position.

Intermittent operation is similar to LOW operation. If the windshield wiper switch is in the INT position, battery voltage is applied to the LOW side of the windshield wiper motor. The ground is pulsed through the closed contacts of the windshield wiper switch. Turning the INT TIME control on the windshield wiper switch adjusts the timed pulses sent to the windshield wiper motor.