enabling body computer on fiat GP for park assist

[cipollinox]

Hello everybody
I am a newbie and I own a fiat Grande Punto 1.9 mjt I would like to know if anybody has ever enabled Park assist on Body Computer in a car like mine. I know that the wiring is already present in the car but I need to buy a park assist control unit and before buying it I want to be sure Is going to work.
thanks in advance to everybody