Rear Wiper Operation
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The rear wiper is controlled by an input from the rear wiper/washer switch which is located in the center console switch bank. The rear wiper/washer switch is a three position switch, when the WIPER protion of the switch is pushed into it's detent the rear wipers are turned on, a voltage signal from the BCM is applied through the wiper washer switch to the rear wiper motor to command it ON. With the switch in the center or rest position the wipers are OFF.