The iBus TCU was fitted to the E46, Z4, X5 and X3. After that they went to the MOST bus which has an additional optical fibre connector and is not compatible. I think the last X3/X5 units were about 2006. Obviously they' have the latest and best hardware and software, assuming they aren't RFMD (re manufactured) old ones.

The BT antenna looks like this and is unlikely to be in your car if you don't have the antenna compensator, a cream FAKRA cable etc.



It is not mandatory to code the TCU to your car. Only if you want BMW assist do you need to set the VIN. Only Navcoder can enable the occasionally dormant voice control in the TCU, as well as set the VIN, BT name and BT passkey.