There is no such thing as a wiring plan for an Italian car.
An Italian car with good wiring is like a British car that dosn't leak oil.
You could try your local book shop for a mechanical manual, or get one online from any of the online book stores. Helms seem to be the best, but even a Haynes one should have a good basic wiring diagram.
However electric windows are often quite an easy thing to fix.
Often its just a blown switch, or even the runners might need a little lubricate in them.
Can you tell us exactly what its doing, or not doing?