My production date is 11/2003. The truck is used (of course) and according to the dealer Bluetooth was working with the previous owner. What should I look for as far as components possilbly already installed or what would I need to buy. Right now, bluetooth nor the Assist seem to be working. And since I knew that you'd lose Assist with the addition of BT, I assumed that maybe the dealer was correct in saying that it was working before. If not the perhaps I can make a stink about it since the BT option was a feature that they pushed in selling the vehicle.

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2004 BMW X5 4.4i Sterling Silver/Beige
2002 BMW 330xi Topez Blue/Gray
2001 MB CLK55 //AMG Quartz Blue/Ash
2001 Isuzu VehiCross Ebony/Gray
2006 Yamaha YZF-R1 Blue