Possible Causes

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Circuit reference - IGN -

Ignition sense circuit short circuit to ground, short circuit to power, open circuit, high resistance - Power mode differs to that broadcast on high speed CAN