What is the part number of the TCU?

Assuming it is part number 84.10-9 195 455, which is the newest available, since around 10/2007, then that should work. The TCU goes into pairing mode for the first couple minutes every time you turn the car on. The TCU does not use a pairing button to initiate the pairing, like the old ULF modules used to do. Do you know if your friend tried to detect the car with his Bluetooth cell phone after first turning the car on? If so, he should have been able to successfully pair the phone to the car.

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MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input