Circuit/System Description

The Body Control Module (BCM) controls the washer pump motor based on an input from the windshield wiper/washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the wash switch is closed, ground is supplied to the windshield washer switch signal circuit. When this is seen, the BCM will apply ground to the WSW relay control circuit and command the windshield washer fluid pump and the low speed wipers on.