Rear Heating, Ventilation and Air Conditioning (RHVAC) Control Module
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The RHVAC control module is located in the second row on the rear of the center floor console. 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.