[boats4life]

I would just do what I did for my system, but a GM-AA44 pac LOC and it's all plug and play! No need to mutilate the factory wiring...

 

[boats4life]

I'll post a link. The hardest part was removing the panels without scratching or gouging them, but they pop right off. After that, it's just a few screws and it's pretty easy. There's just enough slack to insert the new harness go-between. I ran my power wires down the drivers side and my audio down the pax side. (helps keep out interference from the power cable to the audio signal)

I had the part number mixed up, lol:
This is it
Pac-Audio.com Product Details | iPod Integration for your car and More by Pac-Audio - Connecting you to the future

But you can get it cheaper:
Pac AA-GM44 Add Amp Interfac for 2010