So I had like many, issues with the drivers wiring loom through the pillar, 3 of my large cables snapped and 1 of the small. Nothing was working at all in the drivers door. So I bit the bullet and replaced the loom. Everything works again. However the one thing I notice which is not working (and I think it did work for a few weeks post the loom change) is the buzzer when you leave your headlights on. I've had 1 flat battery when I came to leave work.

Does anyone know where the buzzer noise even comes from normally? I wondered if it was from the headlight switch itself, or whether it might be from somewhere else?

Any ideas?