Ignition Switch
WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC
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The ignition switch is installed in the instrument panel and is hardwired to the Body Control Module/Gateway Module (BCM/GWM). When the switch is pressed two signal lines from the BCM/GWM are connected to ground.