Washer System

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The windshield washer and the rear window washer are activated by the internal wiper motor modules when they receive a ground from the multi-function switch between the washer inputs. Depending on the correct ground, the internal wiper motor modules activate either the windshield washer or the rear window washer relays (internal) by grounding the respective relay coil. When either relay is activated, it connects voltage to the washer pump while the deactivated relay provides ground to the washer pump. In this manner, voltage polarity is reversible to achieve directional change of the washer pump and washer fluid. If the front or rear washer button is applied for greater than 10 seconds, the associated wiper motor will default the washer system to off and the washer system will be inoperative for that ignition cycle.