Found 3 wires today that go up the drivers side A pillar and dissapear under the roof lining.

the other end, which is down by the fuse box has a square white plug, of which is not plugged into anything.

anyone know what this would be?

my suspisions are it could be power and earth supplies for an electric sunroof but my car never came with one - do they all have the wiring fitted already regardless if the spec of that car would have had the extra features?

my worry is i cant find anywhere for this white plug by the fuse box to locate so dont want to muck up the electrics when i start having panels fabricaed to hide all he wiring!