Why Can't the High Beam Be Turned On?
2 Answers
When driving on roads with streetlights or other good lighting conditions, the high beam should not be used. If the road is poorly lit at night but streetlights are on, the low beam should be used. When there are no surrounding lights and visibility is poor in the distance, the high beam should be promptly activated. Reasons why the high beam may not turn on include: 1. Damaged high beam fuse, 2. High beam relay issue, 3. Faulty main connector of the high beam. It is recommended to first check the high beam fuse, then measure the input and output signals of the high beam switch. If there is an input signal but no output signal, it indicates that the high beam switch is damaged and needs replacement. If there is no output, inspect the relevant wiring.
I've also encountered situations where the high beams wouldn't turn on before. Most of the time, it's either a blown fuse or a burnt-out bulb. With over a decade of driving experience, I've learned that when high beams suddenly fail, the first thing to check is the fuse box. Find the corresponding fuse and pull it out to inspect. If the metal filament is broken, just replace it with a new one - it's a matter of a few dollars at an auto parts store. Another possibility is a faulty relay, located in that small black box under the steering wheel. If the clicking sound is gone, that's usually the culprit. Also consider issues like aging wiring or poor switch contact, especially common in older vehicles. By the way, for those who've modified their headlights, pay attention to voltage issues - power mismatches can cause burnout too. I recommend troubleshooting these basic issues first. If that doesn't work, head to the repair shop immediately - driving at night without high beams is extremely dangerous.
