Washer System

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The front and rear washer systems use the same washer reservoir and washer pump. The front and rear wiper motor modules each contain an integral washer relay. When the windshield and rear window washer relays are inactive, the washer relays supply a path to ground to the washer motor.

When the windshield wiper motor module receives a windshield wash signal from the multifunction switch, the windshield wiper motor module activates its integral windshield washer relay which sends voltage to the washer pump. The washer pump receives ground from the inactive rear window washer relay in the rear wiper motor module.

When the rear wiper motor module receives a rear window wash signal from the multifunction switch, the rear wiper motor module activates its integral rear window washer relay which sends voltage to the washer pump. The washer pump receives ground from the inactive windshield washer relay in the windshield wiper motor module.