The BT passkey is printed on the part number sticker on the Bluetooth module. You will have to disassemble the trunk area to get to it. Alternatively, the BMW dealer can connect the car to their diagnostics computer and read the code that way.

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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