Though I this may help anyone who is curious of the colors behind the head unit. Keep in mind I do recommend the use of the proper wiring harness so no cutting is needed, "other than steering wheel controls"
Constant 12 Volt = Orange/Black "large"
Switched 12 Volt = Yellow/Green
Ground = Black/Green
Illumination/Dimmer = Orange/Black "small"
Front Left + =White/Black
Front Left - =Grey/Black
Front Right + = White/Red
Front Right - = Grey/Red
The rest of the wires I will research later.
If you have any questions please feel free to ask.
Here is my install