Ok so I just input your vehicle. And this is what I get. http://www.crutchfield.com/p_1207050...s.html?tp=2977
(Your link wasn't working for whatever reason)
I have a pic of mine. Yes it is a complete mess but somehow it ended up working. Lol
All I used was the two that crutchfield sent me with the head unit. The third one which you can sorta see in the pic(behind the purple wires) is not plugged into anything. I forgot that I had to tap into the factory wiring on the third plug to make the steering controls work. I don't like to mess with that stuff at all either but a previous owner already messed with it when they installed a aftermarket sub. Besides the steering controls are so handy.
Sooo, long story short. You should follow the wiring diagram that came with your Sony unit and the ones that come with the harnesses. If you can't wait for shipping I remember seeing these harnesses at Meijer.