Circuit/System Description
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The rear wiper is controlled based on an input from the rear wiper/washer switch. When the wiper portion of the rear wiper/washer switch is closed, a ground signal is provided to the rear window wiper motor indicating rear wiper operation is request. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the BCM. The rear wiper motor also monitors the state of the liftgate ajar indicator and will suspend rear wiper operating when the liftgate is open.