Heated Rear Window (HRW)
WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The ATCM controls the operation of an electrical heater element to rapidly defrost/demist the rear window.
For additional information, refer to: Glass, Frames and Mechanisms (Description and Operation).