Circuit/System Description

The body control module (BCM) controls and monitors the state of the wiper high speed relay control circuit. When the windshield wiper switch is placed in to a high speed setting, a signal is applied to the BCM through the windshield wiper switch high signal circuit. The BCM then applies battery positive voltage to the Wiper HI relay through the wiper High speed relay control circuit. This energizes the Wiper HI relay, allowing battery positive voltage to be applies from the wiper/ws fuse, through the switched contacts of the wiper relay and through the switched contracts of the Wiper HI relay to the windshield wiper motor. Ground is applied at all times to the coil side of the wiper HI relay and to the windshield wiper motor from G201.