The low beam headlights don't work but the high beams do

SOURCE: low beam headlights

Try swapping #45 cooling fan relay and #46 HDM (headlight driver module) relay in the underhood fuse block. These are solid state modules and are not like conventional relays.

SOURCE: Low beam headlight not working

check the bulbs first because on most cars the low beam bulbs blow out first and yes check the fuses under the drivers side dash and also the relay box under the hood if owners manual check there also to find where everything is located also if you have any after market CD player or amps check the grounds and connections on these also

SOURCE: Headlights

The same bulb in a lot of applications controls both the high and low beam. Generally the low beam portion will burn out and for a short time you will be able to use the high beam only. I can't be certain which headlight switch that you checked, but the most common solution is to replace the headlight bulb. The bulb is on the inside of the headlight lense and is accessible by opening the hood and peeling back the rubber cover that covers up all of the headlamp apparatus. Depending on the model of vehicle they are mounted in there differently. Make sure and change both at the same time. It is generally cheaper to purchase new headlight bulbs as a (2) pack and it never fails if you change one the other will burn out in a week. Hope this helps

SOURCE: low beam headlights not working

check voltage at switch

SOURCE: 1998 cavalier headlights will not work. low or

check wiring in the front bumper for corrosion big problem relating to cavalier and sunfire