The box is quite a small one really, possibly similar sized to a kingsize cigarettes box and i do think it's wired up to the 2 sensors inside the car. These 2 relays are definately wired up between the window switches and this box and the windows but i haven't taken the door cards off yet to see what's behind them.

I'll take a few pics on my phone tomorrow in day light, upload them to my pc and post them on here for you if i get a chance