Your headlights are burnt out. Ever see a car coming at you with their high beams on and when they turn them off they only have one or none. Check with the parts store but that would be the easiest problem
check the bulb low bean burns out before high beams
Camry 1999 has only on bulb for both low and high beams.
The Toyota Sienna should have high and low marks on the side of the brake fluid reservoir. Check to see that the fluid level is between the two marks.
Your high beams work but your low beams do not because the switch is broken that switches between high and low beams. Electrical switches wear out.
It is to the left of the steering wheel. It's not a switch but a dial that goes from low to high.
Your low beams are burnt out. that happens alot
Low beams...high beams will light up the snowflakes and actually impair vision.
Low beams - high beams only light up the snow or fog which further impairs vision.
You should use low beams when driving in fog. It is more difficult to see driving with high beams in fog.
Look at headlight lenses, if they are all clowdy, low beams will be dim and high beams will help Look at headlight lenses, if they are all clowdy, low beams will be dim and high beams will help Look at headlight lenses, if they are all clowdy, low beams will be dim and high beams will help
the high beam indicator is only on when the high beams are on
As a guess both low beams are burnt out The daytime running and high beams are the same light filament. Or the fuse or the relay for the low beams.