The windshield wiper motor is a 2 speed motor which uses high and low voltage supply circuits. High speed wiper motor operation occurs when the windshield wiper/washer switch is in the high and wash positions. When the windshield wipers are operating at high speed, accessory voltage used to operate the windshield wiper motor is supplied through the switch to the wiper motor.

Low speed windshield wiper motor operating voltage is supplied to the wiper motor from the instrument panel fuse block. The low speed voltage supply to the wiper motor is controlled by the circuitry in the windshield wiper motor cover. When the windshield wiper/washer switch is in the low, mist, or delay modes the windshield wiper/washer switch signal circuit is used as an input to the wiper motor cover, and the low speed supply voltage to the motor is controlled in relation to the switch position.

The windshield washer pump motor operating voltage is supplied and controlled by the windshield wiper motor cover. When the windshield wiper/washer switch signal circuit to the wiper motor cover indicates a wash command, voltage is supplied to the windshield washer pump motor. The windshield wiper motor operating voltage during wash mode is supplied from the windshield wiper/washer switch through the high speed circuit.