Not sure if this is connected, but when you go about 90mph for a few seconds, the lights come on regardless of light conditions... (when in auto) they stay on for about 5 minutes. (so I'm told, officer) And they have some connection with the wipers too, I think.
As for the dash rattle around that grille, a swift thump fixed it on the diesel mk5 I had... been lucky so far with this car.