It is supposed to be a "proprietary" Mitsubishi format
It connects the Stock radio to the CD Changer in the back of the car (IF YOU HAVE ONE)
and the pin out for it, I think it is this. I say "I THINK" , since that pinout looked from an OLD receiver.
more pin outs here: http://carstereohelp.net/wireharness_Mitsubishi1.htm
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Thanks for the diagram. I just found one of these units and wanted to turn it into a home stereo.
Looks like pins 1 and 2 have the right signal. Pins 3 and 4 have the left signal. Tie the grounds together, and wire the left and right to the phone plug.
Pin 8 is the Accessory signal - it probably goes high when the unit is turned on. Ignore this.
Pin 9 - I don't know.
Pin 10 is ____ enable. Maybe receive enable.
Pin 11 is reset. The line above means an inverted signal, so maybe when it's low, it resets. You might need to put 3v or 5v across this to prevent a reset.
Pin 12 is system request. Don't know what that means.
Pin 13 is data. The head unit probably sends data to the CD using a low-speed serial port.
You kinda need an oscilloscope or logic analyzer to watch the signals and make a guess about the voltages the unit uses (I don't know because I don't mess with car stereos).
My guess is that it's a one-way control - like a remote control, the head unit sends data to the CD. The different buttons send different data.
The CD signals back by setting the wires high or low. One signal will mean "ready to read data". Another means "don't bug me, I'm switching tracks, ejecting, etc.". Another would mean "I have a CD loaded and on track 1".
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