Yup, I think that there was a hardware issue in the first year of the BT/TCU production. The labels on the parts indicate BT, and the cars came with the BT passkey cars. However, the feature was inop. BMW acknowledged the lack of BT in multiple technical service bulletin documents, and informed the dealers of an upgrade path for customers who wanted BT.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input