I put a TCU in mine, BUT I also had to add the blue tooth antenna, and the cable connecting the two, nearly impossible to find I might add!!! plus you need a mic. once you have the bunch installed. your phone should 'find' the Bluetooth module and you should be able to pair up! (does your module have a Bluetooth symbol on it!???)

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2003 X5 3.0i (02/2003) sport package, Sapphire black metallic / Black Dakota Sport seats. compass mirror retrofit, trailer hitch retrofit, Prodigy P2 trailer brake controller installed, PDC retrofit, Lumbar support retrofit. heated rear seats retrofitted. Running boards retrofitted and subwoofer install in progress. 4.8is Brakes installed front and back. Bluetooth TCU installed, Rear Fog lights installed. Retrofitted reclining rear seat backs.