Hi, I have a audi A4 cabrio from 2003 with a concertII Bose system.

im Having some problems and hop someone can help me out.

The radio doesn’t turn off when I take the key from the ignition.
The cd changer in the glove box does not work.
The steering wheel buttons for the radio doesn’t work and
The dash board where it’s says the radio station in between RPM and Kph does not work also.

thanks