This form goes into some detail about it!! Look under wiring or read it all : ]
Although I would not expect major changes it you stayed with the type of transmission you have as in automatic or manual. But The computer box is right their in your engine bay, so possibly the majority of the changes if you stayed with in the year of your car being manufactured and accessory options you could just get a used or em harness to go in? Can some one confirm this for me?