there are normaly
With electrical sunroof:
5 wires
2 for the sunroof and 3 for the interior lights.
without electrical sunroof
only 3 for the interior lights.
The wires meet up in a 5 or 6 pin white plug that goes in the fusebox.
The anti frost wires comes out in both lower corners of the windscreen in the engine bay.
You can se it here. This is before i converted my wiring to the electrical sunroof.