Originally Posted by Mike Benvo
Both the Combox and TCU are VIN coded.
I wouldn't suggest a swap without proper coding, it will leave telephone functions in both cars inoperable. After the swap and proper coding, the assist accounts will also be switched, so you should disable that or contact BMW to switch the ESN's.
Also, your car must have software new enough to support combox also (plus you will need the harness and a terminator for the mulf module if equipped).
Other than what I pointed out, the units will work in each car without issue.
Off topic, Is this the combox with telematix? I can't find this part number on realoem.com, but found the one ending in 1092 as opposed to 1090.