Dude, just get yourself a toyota stereo install harness. You can get them at walmart for like $10, and all you have to do is match the wires on the harness to the stereo and you're set. If this is too much for you, then you can go the extra mile and get yourself one of those "Toyota-to-(place name here) adaptors. I've seen Toyota-to-JVC, Toyota-to-Kenwood, Toyota-to-Pioneer, also Honda-to- Nissan-to, etc.. these are usually available at higher end shops and they cost you a lot more but it will be more plug and play.