Circuit Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 control circuit. When the windshield wiper switch is placed in to a low speed setting, a signal is applied to the BCM. The BCM then applies battery positive voltage to the coil side of the WPR1 relay through the WPR1 relay control circuit. This energizes the WPR1 relay, allowing battery positive voltage from the FRT WPR fuse through the switched side of the WPR1 relay to the windshield wiper motor. Ground is applied at all times to the coil side of the WPR1 relay and the windshield wiper motor form G200.