On My 2004 X5 (4.4i), I have BMW Assist but missed the Bluetooth integration by just a few months ( ).

I have since bought a box of tissues and decided to deal with the issue by attempting to replace the TCU. I have heard that the TCU part no changed recently to a new control unit, ending in -114 i think. Also, where is the TCU located in the vehcile? I want to look at the one I have right now.

Anybody know how hard it is to change the TCU myself? If I do that, I'll have to get it re-coded by dealership. Think it's possible for me to swap the TCU and say that Assist stopped working, possibly re-code for free?

Or even somehow break my current TCU and have them give me the new one as replacement?

Any ideas? Most importantly, where is the tcu in the car?

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'04 BMW M3
'07 MB S550
'05 Infiniti FX35
'04 BMW X5 (4.4)
'03 MB ML500