1. Bulbs: Check to see if the headlight bulbs are burned out. You can do this by visually inspecting the bulbs or by using a multimeter to test for continuity. If the bulbs are burned out, replace them with new ones.
2. Fuses: Check the fuses that control the headlights. If a fuse is blown, replace it with a new fuse of the same amperage.
3. Headlight Switch: Make sure the headlight switch is turned on. The headlight switch is usually located on the dashboard or steering column.
4. Headlight Relay: If the fuses and bulbs are good, the problem could be with the headlight relay. The headlight relay is a small electrical switch that controls the power supply to the headlights. If the relay is faulty, replace it with a new one.
5. Wiring: Check the wiring that connects the headlight switch, relay, and headlights. If there is any damage to the wiring, repair or replace the damaged wires.
If you have checked all of these things and the headlights still do not work, it is best to take your vehicle to a qualified mechanic for diagnosis and repair.