Very interesting SIB, I have known people with 04s to successfully get their phone to pair if it came with a PK on the bluetooth card, so that is bizarre. My car did not come with a PK, so I had to do the retrofit to a combo module. If you upgrade the TCU to a BMW Assist/Bluetooth Combo module, you most likely also will need to wire in a bluetooth antenna. The whole retrofit cost me about 800 bucks in parts.