You can use the online wiring diagram from the link at the top of the page: http://www.xoutpost.com/e53wd.php

Look up module "N28 GPS Receiver" for the wiring between the Trimble module and the MKII nav computer.

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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