1. Check the fuses. There may be a blown fuse that is preventing the low beams and high from working. Check all of the fuses in the fuse box, and replace any that are blown.
2. Check the bulbs. The bulbs in the headlights may be burned out. Check the bulbs in both the low beam and high beam headlights, and replace any that are burned out.
3. Check the wiring. There may be a loose or damaged wire that is preventing the low beams and high from working. Inspect the wiring around the headlights, and look for any loose or damaged wires. Repair or replace any damaged wires.
4. Check the headlight switch. The headlight switch may be defective, preventing the low beams and high from working. Test the headlight switch to see if it is working properly. If the switch is defective, replace it.
