Power Supply
WARNING: This page is about a different car, the 2018 Jaguar XF and 2017 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.
The TCCM receives power via an All-Wheel Drive (AWD) relay located in the EJB (Engine Junction Box).
The Battery Control Module/Gateway Module (BCM/GWM) supplies a direct ignition input signal for system wake-up.