Odds are the Trimble Module is dead. The GPS receiver (Trimble Module) is attached to the back side of a brass-colored bracket to the left of your CD changer and amp in the rear compartment. I would verify that all of its connections are sound. If it visually checks out, you will probably need a replacement. I do not know of another way to verify that it is in good working order.

Or, you could treat this as an opportunity to upgrade to a newer MKIII or MKIV nav computer.

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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