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Originally Posted by ravic
I just replaced the TCU in my 2004 X5 (06/2004 built) with another TCU with part# 84 11 6 946 993 (1st generation with 12/12/2004 build date) and bluetooth started working right away.I did not have to visit the dealer for any kind of coding. I do remember reading somewhere that lot of the late model 2004s were shipped with everything coded, they just did not have the bluetooth in the TCU functional.
I learned a lot about my new (for me) 2004 X5 reading these forums. Thanks for all the folks who added all the information on this site.
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I guess that the replacement TCU was previously programmed, as in used. Most probably the previous car VIN is still set in the Assist portion...