Just because the colors of the wires match doesn't mean that they go to the same things. I found that out trying to wire my sony cd player into my hyundia accent. All cars have a different wiring diagram for stock wiring. But they put the wiring diagram on the circuit board. It is easier to just pull the cover off the stereo themselves, and look at the circuit board, then hard wire it. That way you don't get a cross circuit and fry your system.
That was the best info that a local audio dealer gave me. Good friend, he has been putting them in for years.