You would need to buy toyota harness, that attaches to the back of the unit... then you can plug right in, without disturbing the factory wires. The harness only costs about $5-$10... Check out crutchfield.com, put in your vehicle and the avic-f, it will give you a list of the things you need; you can then search them out locally or buy online.
I have the 2008 xB Release series, and had no problems with my install and the parts i bought locally. The one thing i couldnt find was a dash kit, i was about to make something custom but bought from crutchfield - fits perfectly.