CD changer works even using burned CDs, CD1-C6. Radio, AUX input, Weather functions work. Steering wheel controls work. CD0 in the Comand unit does not seem to work with the disks I have tried. I have tried both burned and original audio and NAV DX disks.

In CD mode when I try to select CD0 versus the changer I get a no CD error message. When I select NAV I get a similar error. Both cases I put either a audio or NAV CD into CD0. Once in a while I will get a CD Reading error.

I have tried two different NAV CDs. First was a new Blaupunkt DX #9 CD. The next was a burned "Mercedes" #9 CD I found on line. #9 is Southeast USA. I checked both with my PC and they seem to have almost identical files and the config.sys files did not have the Mercedes Comand info commented out so they should have worked according to the info I found on line. The burned CD was used by a guy in his older Audi. I bought the new 2005 Blaupunkt DX CDs on-line from a Blaupunkt dealer who says they work in a Comand 2.0 unit.

The CD0 was never used except when the car was originally delivered to the new owner. He only got 1 NAV CD with the car and it was for the wrong state so he never tried it again. The car was bought from a secondary dealer with 100 miles on it in 2003. The guy always used the AUX input when he was in the car for the whopping 3500 miles he drove the car in six years.

Is there a test CD I can use to see if the NAV system is functional?

Is there a way to test the GPS without a NAV CD?