Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The body control module, (BCM) controls and monitors the state of the Wiper HI Relay control circuit. The wiper hi relay is used to control the hi speed wiper function. The BCM supplies a negative voltage to the relay. The relay is supplied B+ from the WIPER/WS fuse. The voltage level from the BCM should be high while the relay is inactive. The voltage should be near ground when the BCM commands the relay ON.