For mine it was only three. Power, Ground, and 1 Data wire. The module should will have a couple sets of paper instructions. One for programming and general install, the other with list which wires are used specific for you vehicle. If you go to
http://peripheralelectronics.com/web/pe ... ctions.asp you can read up on what the harness entails.
The harness will have several wires and the instructions will tell you which one to use. You can leave the other wires on the harness and insulate them with tape or remove them from the plastic harness with a very small screwdriver or pin. The wires are held in the plastic harness with a very small metal tab. Push in the tab and pull the wire out.
I did this to help with the massive amounts of wiring I had with the Z1 wires, the Bose/Onstar wire harness, the chime module and the steering wheel remote module.