Where is the Bluetooth fuse or sensor located on a 2011 xjl supercharge

The bluetooth system in Your 2011 Jaguar XJL is built into the head unit in Your vehicle. There is not a separate fuse for the bluetooth system, it is all part of the radio fuse and if the stereo will not turn on at all then the first thing to do is check the fuse. If You are having problems with Your vehicle's bluetooth system then I recommend that You unpair all devices and reset them. Doing this will clear all the connections and then You can reconnect them to Your car. That will usually solve most problems with bluetooth communication issues. More often than not the phone is the actual problem and restarting that can fix up a lot of the issues.