MY TCU looks nothing like that on the inside!
The following detail is just for info really. Hopefully someone might find it useful!
On the sticker on the front it says:
84116978533-01
16921111
27.05.2007
BMW everest ibus ece
sw31 hw30
bt 00e00c5246a3
pk8084
imei 352etc
ejas001085. Sveibs22b4

Please excuse the table cover - it is anti jam/snot/crayon etc from my kids!

First of all, it has a slot in the side for (presumably) a sim in a carrier.


Overview with it all opened up.


close up of the bluetooth module.


close up of the (assist?) bit under the metal plate. (nb my O2 sim. It didn't work).