Rear Wiper/Washer System

With the ignition Switch in "ACCY" or "RUN," voltage is applied to terminal "A" of the Rear WDO Wiper Motor Module and to terminal "D" of the Rear WDO Wiper/Washer Switch through CKT 393.


WIPER OPERATION

When the Rear WDO Wiper Switch is set to "ON," battery voltage is applied to terminal "C" of the Rear WDO Wiper Motor Module through CKT 391. This voltage is used by the Wiper Motor Module as a signal to start continuous Wiper Motor operation. The power to operate the Wiper Motor is supplied to the Wiper Motor Module at terminal "A". The ground is connected at terminal "B" through CKT 150.


DELAY OPERATION

Delay operation is the same as wiper operation except when the Rear WDO Wiper Switch is set to "DELAY," voltage is dropped across a 750 k ohm resistor inside the switch. The voltage applied to terminal "C" of the Wiper Motor Module is less than battery voltage and signals the Module to start operating the Wiper Motor with a fixed 5 second delay between sweeps. This will continue until the Rear WDO Wiper Switch is set to "OFF," at which time the Wiper will park.


PARK CYCLE

While the Wiper is running, the Park Switch in the Rear Wiper Motor Module is closed. When the Rear Wiper Switch is set to "OFF," voltage is applied through the Park Switch contacts to keep the Wiper Motor Relay closed until the Wiper reaches the "PARK" position. The Park Switch opens and the Motor stops.


WASHER OPERATION

When the Rear WDO Wiper/Washer Switch is held in the "WASH" position, the Wiper/Washer Switch applies battery voltage to terminal "C" of the Wiper Motor Module causing it to begin wiper operation. The Wiper/Washer Switch also applies battery voltage to terminal "A" of the Rear Washer Motor, through CKT 392, causing the Washer Motor to start spraying until the Wiper/Washer Switch is released from the "WASH" position.