Theory Of Operation
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) is the Local Interconnect Network (LIN) master for the Rear View Mirror, Humidity Sensor Module, Terrain Switch Bank Module and Auxiliary Switch Bank Module. The BCM monitors the LIN circuit for any concerns.