Principles of Operation: Notes
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the wiper relay coil at the Battery Junction Box (BJB). The wiper relay coil is grounded at all times. Voltage is supplied to the wiper relay switch from BJB fuse 9. When the wiper relay is activated, voltage is supplied to the wiper motor.