Audio Systems: 1999 pontiac grand prix color coded wiring diagram, pontiac grand prix, car button

Question
I am looking to install a pioneer DEH7800MP radio in my car with the PAC SWI-PS steering wheel radio control interface so I dont lose my steering wheel controls.Is there any website where I can get a complete wiring diagram (color coded) for my car (Audio) including steering wheel because the PWI SWI-PS is an intallation task that I am not familiar with (steering wheel)and need to know which wire goes to which.Any suggestions.

Answer
yes, actually try this, go to www.crutchfield.com

on their site there a "find what fits my car" button, fill that out and pick your options.  you can get the PAC from them and the harness and they'll give you step by step instructions and even tools if your car needs special tools to take the dash off and stuff like that.  they give it all to you free if you get the stereo from them but it sounds like you already have that huh?

Good luck! let me know how it goes!