Theory Of Operation
WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) monitors the operation of the Rear Wiper Motor through the Rear Wiper Park Switch, which is integral to the Rear Wiper Motor. The Rear Wiper Park Switch switches the signal circuit to ground when the Rear Wiper Motor is in the park position.