I have 2 buttons like this, one where yours is has a little light on it, this is fog lights for me, tried and tested.
the other one makes some kind of compressor noise happen in the engine bay, and I am unsure as to what it is so I leave it off lol.
any ideas?
maybe it's like the abs button and I have been driving around with it off all the time lol, glad I leave breaking distance lol
