Low Speed Windshield Wipers
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Low speed operation is activated when the multifunction switch supplies a specific ground to the inputs of the windshield wiper motor module. The windshield wiper motor module then supplies a ground to the windshield wiper run/park relay coil, activating it. The run/park relay and high/low relay are contained in the wiper motor electronics. When the windshield wiper run/park relay is activated, the deactivated windshield high/low relay connects voltage to the windshield wiper motor low input activating the wiper motor. The windshield wiper motor module continues to operate the windshield wiper motor in the same manner as in high speed, but in the LOW SPEED position the wiper motor is connected to the low speed input.