Normal Operation
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
When the wash function is selected by the operator, the multifunction switch grounds circuit 680 (LB/OG) to the windshield wiper motor. The windshield wiper motor interprets this ground signal and energizes the internal washer relay. Voltage is sent to the washer pump from the windshield wiper motor through circuit 941 (BK/WH). The windshield washer pump motor is grounded through circuit 57 (BK). The multifunction switch is grounded through circuit 57 (BK).
This pinpoint test is intended to diagnose the following:
- Multifunction switch
- Wiring, terminals or connectors
- Washer pump
- Windshield wiper motor