I would rather suggest for you to use SPI
kind of board to trace Kenwood protocol ;)

WBR Dmitry.

PS. It is definitely not an I2C.

PPS. Hint - on the bench you can use Kenwood
     remote control unit instead of taking
     radio out of your car.


Joe Denehan wrote:
>
> This may be a bit ambitious but I was thinking of installing an old 75Mhz
> Pentium in my car boot/trunk to use as an MP3 player. I have a Kenwood car
> stereo and 10-disc changer and would like to keep the head unit to control
> the PC-MP3 player. Basic functions like skip to next song, play, and maybe
> even CD-Text for the song title/artist. I have the pinouts for the 10-disc
> changer socket and was wondering if anyone out there could get me started in
> the right direction, any help at all would be gratefull accepted.
>
> Regards,
>                 Joe Denehan
>
>    Pinouts
>   /--------\
>  /   9 5 1  \
> |13 10 6 2 ##
> |   11 7 3 ## Notch
>  \  12 8 4  /
>   ----------
>
> 1.  Changer On (+4V) - Out
> 2.  +12V - Out
> 3.  Ground
> 4.  Reset changer - Out
> 5.  Left channel input - In
> 6.  Unknown
> 7.  Audio Ground
> 8.  Mute sound - In
> 9.  Right channel input - In
> 10. I2C output data to CD changer - Out
> 11. I2C input data from CD-changer - In
> 12. Changer present - send on this pin +4V - In
> 13. Clock data synchronize

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