Problems by replacing the Sxara Picas CD radio

You see, I was screwed by the radius of my Sxara Picasso (it is 2002). I had another of my old car and put it on me without the steering wheel controls and without a boarding computer.
The steering wheel I suspected it but the computer has a surprise. Do you know if there is any cable that must be removed, replace or bridge so that the computer works?
Can the Picasso CD replace without such problems?
Thank you