think it has a seperate loom geez. and it runs off a 25 amp fuse, not sure what number it is off the top of my head.

not 100% sure if you would have the loom, without looking for it, best best is to take vents out and have feel for any extra loom behind the dash, but id guess if you havent got heated screens then id say you havent got the loom.....

hope that helps in some way.