Rear Heating, Ventilation and Air Conditioning (RHVAC) Control Module - Vehicles With: Quadruple Zone Automatic Temperature Control
WARNING: This page is about a different car, the 2020 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.
The RHVAC control module is used by the rear vehicle occupants to request changes to the rear climate control system. The requests are sent to the HVAC control module over the MS-CAN.