Why do the headlights turn off when the engine is off even if they were left on?
2 Answers
The reason why the headlights turn off when the engine is off even if they were left on is: 1. Dimmer switch malfunction; 2. Circuit interruption, fuse blown; 3. Light relay not working; 4. Battery power depleted. Headlights, also known as automobile front lights or LED daytime running lights, serve as the eyes of a car. They not only affect the external image of the car owner but are also closely related to safe driving at night or under bad weather conditions. Automatic headlights are a light-sensitive control system installed by some car manufacturers for the convenience of users. When the light becomes dim while driving, the headlights will automatically turn on, and they will automatically turn off when the light becomes bright. Automatic headlights only work when the light control is set to the AUTO position.
I've encountered this situation too, it's not a malfunction but a built-in protection feature of the vehicle. After turning off the engine, the vehicle's electrical system automatically cuts power to the headlights, mainly to prevent battery drain. After all, headlights typically consume over 55 watts, and leaving them on all night would definitely kill the battery. Most modern cars now come with automatic headlight function, which completely cuts power within 30 seconds after locking the car. If you drive an older model, remember to develop the habit of manually turning off lights before shutting down the engine. Once I forgot to turn off the interior light and had to call for emergency jump-start the next morning - what a hassle that was.
