Oh yeah X5 ULF needs the seatbelt to be in to do the pairing. It's so obscure I had forgotten, but it's buried in one piece of the paperwork I have downloaded from somewhere.
Quote:
PAIRING PROCEDURE E46/E83/E85/E53
Turn Key off and then to KL-R or KL-15.
1.The vehicle is ready for pairing for the first 2 minutes of key on.
2.If the R/T button on the MFL is pressed, "Activate Phone" appears on the MID or Board Monitor. For the E53 X5 the seatbelt needs to be plugged in and the R/T button pressed on the MFL and "Activate Phone" appears in the Instrument Cluster.
3.During the pairing process, depending on equipment, the indicator lights on MID or Board Monitor display flash.
4.Your mobile phone should now be set to search for BT devices. See the Owner's Manual for your handset.
5.A request to enter a password, PIN, or code appears on the handset display, depending on your model.
6.Enter the 'BLUETOOTH PASSKEY" (supplied with the vehicle literature), using the numerical keys on the handset and confirm the input. Look for a confirmation message on the handset.
7.To conclude the pairing process, turn the key off.
8.Wait approximately 30 seconds before turning the key back on. The phone will now be connected when the key is turned on. It may take several minutes to initially load the phone book stored in the handset depending on the number of entries.
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source:E46 TCU paring.pdf SI B84 13 04 May 2005.