Hi Jeff, you write of i-bus and i think it's in X5 but i think also my e39 isn't so different from a 2002 X5 because as specified for I-bus, i've got in my car same devices as in X5: the steering wheel controls for the radio, CD, and phone are present in my car. So that i think my navigation system is the same in X5. I can add that on Ebay i 've found the same tv tuner (same code number) and the seller assure you can choose between 4:3,16:9 and zoom function.
As soon as i buy cables, i'll try it.
Bye
Claudio