The windshield wiper/washer system consists of the following components:

The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The ignition positive voltage circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits. The windshield wiper switch signal circuit logic levels to the wiper motor determine the wiper motor operating mode.

When the wiper/washer switch is in the LOW position voltage is supplied to the motor through the windshield wiper low speed circuit. The applied voltage causes the wiper motor to operate in the low speed mode.

Windshield wiper/washer system MIST operation is identical to LOW operation except that the MIST switch is a press and release type. When the wiper switch is moved to the MIST position and released, low speed wiper motor operation is started and will continue until 1 cycle is complete. If the wiper switch is moved to the MIST position and held, the windshield wiper motor will operate in the LOW mode until the switch is released.

Windshield wiper DELAY operation is a low speed wiper motor function with a variable delay interval between the wiper motor cycles. The DELAY interval is controlled through a logic circuit within the wiper/washer switch. During DELAY wiper operation, the low speed circuit to the wiper motor is supplied with a pulsed battery voltage. The windshield wiper/washer switch uses the DELAY interval logic circuit to determine the frequency of the low speed wiper motor cycles.

When the wiper/washer switch is in the HIGH position the ignition voltage to the wiper/washer switch is closed to the high speed signal circuit. The ignition voltage on the high speed signal circuit causes the wiper motor to operate in the high speed mode. During HIGH speed wiper motor operation the DELAY function is disabled.

During windshield wiper/washer system WASH operation the wiper/washer switch controls the operating voltage to the wiper motor and the windshield washer pump. When the WASH switch contact closes, the logic circuit in the wiper/washer switch supplies ignition voltage to the low speed circuit. Ignition voltage on the low speed circuit activates the wiper motor. When the logic circuit activates the WASH function, the wiper motor low speed circuit is active for a minimum of 3.5 seconds or as long as the WASH command is active followed by 2 additional wiper motor cycles.

Windshield wiper motor park operation is controlled by the logic circuit using an input from the park switch within the wiper motor . When the windshield wiper/washer switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the logic circuit will continue to operate the wiper motor until the wipers reach the park position.