CD changer protocols

[GreekPIC]

I would like to interface an mp3 player to the CD changer bus of a car stereo. For the time being I'm using a portable mp3 player with a casette adaptor. I would like to be able to use a player with a huge hard drive and keep out of the way.

I found a this site (http://www.k9spud.com/vwcdpic/) about interfacing all kinds of audio devices to a Volkswagen's OEM head unit. Especially a player (http://www.pjrc.com/mp3/) which can be controlled from the head's buttons.

Now, I'm willing to buy a new car stereo that is easy to interface, but there is no way I'm gonna buy a VW just to experiment. So, does anybody have any info on any brand CD changer connections (pinouts etc)?

 

[AJB2K3]

i brought an Alipe unit(CD/radio + m-Link for changersitem code CDM- 9825RB which uses the M-Link but im running an mp3&playstation through the official imput lead (din to 2 X phono), when i was googling i found some one had started a "hack"but is still working on it. if you are thinking about trying this unit ill try to work out the wiring.
BTW Alpines own lead is - KCM-122B

 

[AJB2K3]

Oh heres some useful links on M-Bus/M-Link -
http://joerg.hohensohn.bei.t-online.de/mbus/
http://www.cdchangeren.prv.pl/
http://kiora.ath.cx/alpine/

Multiple bus details.
http://www.mictronics.de/?page=cdc_proto#Alpine

And a diagram of an interface.

 

[GreekPIC]

Thanks, I'll check those out