Rear Heating, Ventilation and Air Conditioning (RHVAC) Control Module
WARNING: This page is about a different car, the 2018 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
The RHVAC control module, depending on vehicle option content, is located on the rear of the floor console or the rear seat arm rest. It is used by the rear vehicle occupants to request changes to the rear climate control system. The requests are sent to the FCIM over the MS-CAN.