david almogi I would just use the existing Audio in port in the back. Use a 3.5 to RCA splitter cable, [http://www.outletpc.com/sw0828.html?gclid=CM6JpKzNva8CFS2htgodkXbPvQ|like this one.] If you do this, you will not have to get to heavy on the engineering part of it.
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'''UPDATE'''
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Okay so just had an exchange with david almogi and this did not work. After further research and looking at the schematic, this is because Sony car stereos use a Unilink system to connect with external device. So in order to connect and device you would have to either get the XA-300 auxillary input adapter, which will allow you to properly attach an MP3 player, an FM transmitter or modulator, or get into building your own Unilink board. you can try and build. I did find a few reasonable priced XA300 on ebay. If you want to build your own, check [http://igirder.com/ipodsony.htm|this site ]for more information. Hope this helps to clarify, good luck.
david almogi I would just use the existing Audio in port in the back. Use a 3.5 to RCA splitter cable, [http://www.outletpc.com/sw0828.html?gclid=CM6JpKzNva8CFS2htgodkXbPvQ|like this one.] If you do this, you will not have to get to heavy on the engineering part of it.