High-Speed Windshield Wipers

When the multifunction switch is set to the HIGH speed position, it supplies ground to the high/low speed relay coil and the run/park relay coil, which causes the windshield wiper motor to operate at high speed. During high-speed operation only, both the high/low-speed relay coil ground and the run/park relay coil ground are controlled directly by the multifunction switch. This differs from LOW speed or intermittent operation when the run/park relay coil is controlled by the microprocessor. When the switch is placed in the OFF position, the motor continues to operate until the motor returns to the PARK position and the internal Hall-effect sensor senses the motor magnet. The output to the run/park relay deactivates the relay and disconnects the voltage to the motor.