Buckle Switches
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 buckle for each seatbelt is attached to the inboard side of the related seat frame. Each buckle incorporates a switch that provides a status input to the RCM, which uses the input to determine the airbag and pretensioner activation strategies. The RCM also broadcasts the status of the seatbelts to the BCM/GWM (Body Control Module/Gateway Module) on the HS (High Speed) CAN (Controller Area Network) powertrain systems bus.