like not existing???, or have i missed something
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Rex,
Mine has an immobilliser behind the dash that is supposed to be part of an alarm system. Apparently depending on spec or country the full alarm was available (Rave manual shows this).
I have diagnosed mine and the Nanocom reads it and tests it. So it does infact exist on a TD5 but I am not sure wether it would cause any issues like the full BCU unit in a Disco. Once you have the full firmware upgrade from Nanocom you can see the 2 different listings with Defender Alarm and Discovery BCU sections. Obviously TD5 only.
The little green box is the 10AS alarm unit. Depending on the model of your vehicle it will either be enabled or not. County spec vehicles and above it will be enabled. Generally speaking if you have a keyfob it will be enabled, if not it wont.
The good news is even if its not enabled you can enable it but you will need a keyfob (about £35 GBP each) and access to Nanocom / Rovacom etc to get it talking to the ecu and keyfob.
Regards,
Jon