I had a Ventura technologies adapter in my BMW. It used the CD changer wiring in the trunk to allow me to control a Pioneer GEX900 (I think that was the unit number). It did not support text in my car but it did give me the channel numbers and the ability to use the steering wheel controls to change the channels. I have recently switched to an FM modulated Delphi unit because I needed the changer adapter in the trunk for a Phatbox (mp3 player). The sound through the adapter was much better. There are several companies that make these kind of adapters. I would suggest for you to look at Logjam electronics on the web to see if they have an adapter for your car. They carry most of the adapters that are currently available. They are also extremely helpful and courteous when replying to questions. Good luck!