Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, the washer pump motor is grounded through internal relays in the wiper motors using circuits CRW14 (BU/WH), GD120 (BK/GN) and GD133 (BK). The multi-function switch provides input to the windshield wiper motor through circuit CRW07 (GY/BN) to activate the windshield washer. The windshield wiper motor activates the internal relay and then provides power to the washer pump through circuit CRW14 (BU/WH). The multi-function switch provides input to the rear window wiper motor through circuit CRW20 (GY/YE) to activate the rear window washer. When the rear window washer is activated, the internal relay in the rear window wiper motor provides power through circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Multi-function switch
Washer pump motor
Windshield wiper motor
Rear window wiper motor