Bmw drivers past and present..help solving my riddle.?

i have a bmw 523 se (e39) now my question is - ive just found a box attched and wired underneath my parcel shelf, its a black box in a cradle with at one side a credit card sized slot and wires dissapearing into the car on the other side. there is no mention of this box in my owners manual or audio manual - can u help??

thanx folks
baz

Answers:
What you have described is typical of a control unit / receivers for a fixed car phone. BMW factory fit fixed car phone and Motorola used use credit car size sim cards. If you can see it without taking off any trims it wasn't fitted at the factory so could be removed. Check for screw holes in the centre console where a phone may of been fitted .The other option is that your car has a tracker fitted, but again they are usually well hidden.
all i can say is BMW=Big Money Wasted
That will most likely be your ECM box. ECM= Electric Control Module.
Try looking in a "CHILTONS". "Haynes" are good, but "Chiltons" is better.
i think it's for BMW service mechanics to do a diagnosis. there's a few things you can't do yourself on a beamer.
Its a diagnostic connector for a BMW diagnostic tool,
diagnosis box
That is the tracking device we place in ALL of your cars.
If I were you, I would forget about it and never mention it again.
Or else.

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