The 13pin DIN Port

Here is what I know about the 13 Pin on the back of the RADIO.
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