What are the reasons why the car's low beam cannot be turned off?

[DallasRose]

The reason why the car's low beam cannot be turned off may be due to a malfunction of the car headlight relay. Below is a detailed introduction about car lights: 1. Headlights: The main purpose of headlights is to illuminate the road and objects in front of the car to ensure driving safety. The high beam and low beam can be alternately used as a signal for overtaking at night. Headlights are installed on both sides of the front of the car, with 2 or 4 lights per vehicle. The bulb power is 45-60W for high beam and 25-55W for low beam. 2. Fog lights: Fog lights are installed near the headlights or slightly lower than the headlights. In low visibility conditions such as fog, snow, heavy rain, or dust, fog lights serve to illuminate the road and provide signals for oncoming vehicles. The light is mostly yellow, as yellow light has a longer wavelength and good fog penetration. The bulb power is generally 35W.