Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Under normal operation, the windshield washer pump motor is grounded through internal relays in the wiper motors using circuits 941 (BK/WH) and 946 (VT/LG). The steering column multifunction switch provides input to the windshield wiper motor through circuit 1300 (VT) to activate the washer. The windshield wiper motor activates the internal relay and then provides power through circuit 941 (BK/WH). When the rear window washer is activated, the internal relay in the rear window wiper motor provides power through circuit 946 (VT/LG).