To find the culprit, you'll need to consult your owner's manual. It will have a fuse box diagram showing the location of all fuses and what each one controls. Look for fuses related to headlights, headlamp circuits, or the headlight switch itself.
Troubleshooting Steps (in order):
1. Check the Owner's Manual: This is the most important step. The diagram will tell you which fuses to check first.
2. Check All Relevant Fuses: Don't just check the ones *obviously* labeled "headlights". There might be fuses for the headlight switch, or separate fuses for the high and low beams.
3. Check the Headlight Switch: A faulty headlight switch is a common cause of headlight failure. This is often more difficult to diagnose and might require professional help.
4. Check the Bulbs: Make sure the bulbs themselves haven't burned out. This seems obvious, but it's the easiest check to do first.
5. Check the Wiring: Look for any damaged or loose wires in the headlight harness, especially near the bulbs and the headlight switch. This is more involved and might require some electrical knowledge or a mechanic.
6. Check the Relay (if applicable): Some models use relays. Your owner's manual should indicate if a relay is involved in the headlight circuit. A bad relay can cause a complete headlight failure.
If you've checked fuses, bulbs, and the wiring, and the problem persists, you likely need a mechanic or auto electrician to diagnose the problem further. It's possible there's a more significant electrical issue.
