Nothing too unique about the features on the 2013 Jaguar XJ, battery is in the truck and per the Crash Recovery System screenshot below, the stored gas inflator for the side-curtain airbags is just behind the B-Pillar. Dual-stage front airbags, front seat-mounted side airbags, first and second row side-curtain airbags, and active head restraints with front-seat whiplash protection.