The headlights are not protected by any fancy circuit breakers....just a normal fuse.
However if higher wattage bulbs are used then you could pick up problems by overloading the High Beam Relay.
I at one stage replaced my standard 65w/55w H5 bulbs...as used on Export models...with 100w/85w which were legal in this country.
Because of the extra current draw I fitted four extra relays right at the light bulbs.....the normal low/high beam current would power the new relays only while the relays then switched +12 volts direct from the battery via thick wiring and inline fuses.
I have since removed this setup as these high power beams have become hard to get here.....probably now illegal...and use the 65w/55w bulbs but good quality Hella bulbs which work fine.
The point of this is that if the OP is using higher power bulbs you can pick up problems....in the meantime the High Beam Relay on the front-lower portion of the fuse panel inside the cabin could be replaced and then the Multi-function switch.
Or what I would do first is add new ground wires from a clean chassis point direct to the grounds on the bulbs....maybe the original ground points are getting rusty!