Possibly a defective high beam switch, or associated relay.
Low beams - 9006 bulbs or HB4 bulbs High beams - 9005 bulbs or HB3 bulbs
try new light bulbs
Fuse or bulbs burned out. On most they are separate bulbs or high beam filament is broken if 2 in 1 bulbs.
First check the bulbs, if the bulbs are good I would suspect the high/low beam switch is bad.
change your bulbs and see if that's it.
fuse, bulbs or switch
Bad bulbs or multifunction switch
Bad bulbs? Bad dimmer switch?
Bad bulbs Bad dimmer switch
Check bulbs Check hi-low switch
because they have different bulbs, or at least different filaments in the same bulb.
Check the bulbs and then the multifunction switch (headlight switch)