Battery Back Up Sounder (BBUS)

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 BBUS is located in the right side of engine bay on RHD (Right Hand Drive) vehicles and in the left side of the engine bay on LHD (Left Hand Drive) vehicles. The sounder is only fitted in certain markets and is mandatory fit in the UK.

On vehicles with BBUS incorporates an integrated tilt sensor which monitors the vehicle attitude. The tilt sensor can detect if the vehicle is being moved, towed or raised and will communicate to the BCM/GWM in order to indicate a 'trigger' to activate the alarm.

Operation (SET/UNSET) of the BBUS and tilt sensor is controlled by the BCM/GWM on the LIN 2 (Local Interconnect Network) bus. The BBUS is also connected with a permanent battery supply via the CJB (Central junction Box). An integral, rechargeable battery powers the BBUS if the vehicle battery supply from the CJB is interrupted.