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When it comes to buzzing it can be so many things. It could be a jammed fan, a faulty relay, sounds system feedback, etc. If you could provide a video with the sound, that would be helpful.
I'm also not sure what you mean by the switch for the headlamps. Could you elaborate/provide a photo?
Also: a tip for isolating sound locations: Get a long screwdriver(or any other rod-like device) and hold the handle your ear, then place the other end on different parts of your car. Sound travels much more easily through solids than through gasses(air), so when you put the screwdriver on the source, the sound will be much louder through the screwdriver.
But if I had to make some random guess as to what your problem is, I would say you probably have a fault relay. Those things go out pretty often.
Another way you could try isolating the problem source is to pull fuses(make sure you put them back in the right spots) until the sound stops. Then you will know which system the problem lies in.
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