Wiper and Washer Systems: Description and Operation

Battery voltage is applied at all times from Fuse 2 and CKT 340 to terminal "A" of the Rear Wiper Motor Module. With the Ignition Switch in "ACCY" or "RUN", battery voltage is also applied from Fuse 8 and CKT 393 to terminal "F" of the Rear Window Wiper/Washer Switch.

WIPER OPERATION

When the Rear Window Wiper Switch is set to "ON," battery voltage is applied to terminal "B" of the Rear Glass Interlock/Push Button Switch from CKT 1543. When the Rear Glass is closed, voltage is applied to terminal "C" of the Rear Wiper Motor Module from the Rear Glass Interlock/Push Button Switch and CKT 391. This voltage is used by the Rear Wiper Motor Module as a Wiper Request; a signal to start Wiper Motor operation. The power to operate the Wiper Motor is supplied to the module at terminal "A". The ground is connected to terminal "B" from CKT 150. When the module loses the Wiper Request Signal, it will de-energize its internal relay when it detects the Wiper to be in Park position.

WASHER OPERATION

When the Rear Window Wiper/Washer Switch is held in the "WASH" position, it applies battery voltage to terminal "A" of the Rear Window Washer Pump Motor from CKT 392, causing the Washer Pump Motor to start spraying until the Wiper/Washer Switch is released from the "WASH" position.