NavCoder v1.2 provides no feedback - it just sends the command down the ibus. You use the Telematics screen on the nav to see if it worked.

The CD should open always. You may have received uncoded units, or units that someone tried to upgrade the OS with a wrong CD.

You should confirm that the OS is working

1. Do you get the proper navigation menu on the screen? ie: when you hit "Menu" can you see "Navigation". Does the nav work - can you select Naviation, Settings, Computer etc etc.

2. Using WinBus can you see any ibus traffic being generated by the nav unit? It will appear as NAVE. Send me a copy of the NAV traffic - I can tell whats happening

3. Have you tried an OS upgrade? Caution - you must use a Mode2 CD. See my posts regarding this here:
http://www.bimmerboard.com/forums/posts/293615

Read point 5 especially - this may be your problem. If so,you can restore the nav with a good Mode2 OS CD.