Circuit/System Description

B+ voltage is supplied to the windshield outside moisture sensor. Whenever the ignition is ON, or in accessory positions, the body control module (BCM), sends the windshield wiper/washer switch status by using a pulse width modulated (PWM) signal. When a wipe cycle is needed, the windshield outside moisture sensor sends a PWM voltage signal to the BCM, requesting the wiper operation. The BCM commands the windshield wiper motor wipe cycles. If at anytime a fault occurs between the windshield outside moisture sensor and BCM, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the windshield wiper motor at continuous variable delay intervals.