Hi there, sorry for the delay in replying. There was nothing in my owners manual that was helpful, however I was reading an old Car Mechanics mag. the other day and came across an article on headlights and the beeping noises that are given off if you have a particular type and they go faulty.
It states that the noise can be heard under the bonnet and sometimes under the dash area. Maybe someone in the past has fitted a set of these bulbs which give a brighter light? The bulbs are the High Intensity Discharge or HID type. Evidently, if the Igniter fails they give off a clicking sound.
Anyway, if you want the full story it,s in the January 2023 edition magazine, page 7.
Hope this helps, I am curious myself.........
Peter.