What is the reason why the car fog lights cannot be turned off?

[AliceLynn]

The front fog lights may remain on and cannot be turned off due to poor contact in the front fog light circuit or possible short circuits. It is necessary to have it checked as soon as possible to avoid affecting other circuits. Definition of fog lights: Car fog lights are installed at the front and rear of the vehicle, used for illuminating the road and providing safety warnings during rainy or foggy weather conditions. They enhance the visibility for both the driver and other traffic participants. Purpose of fog lights: The function of fog lights is to make the vehicle visible to others in conditions of reduced visibility, such as fog or heavy rain. Therefore, fog light sources need to have strong penetration. Most vehicles use halogen fog lights, while LED fog lights are considered more advanced.

[VanAvery]

I've been driving for nearly twenty years and have encountered issues with fog lights that won't turn off. There are usually several common causes. The switch might be stuck or worn out, causing the rotary knob to malfunction. The relay is another critical component—if its contacts are stuck together, current will continue to flow, keeping the fog lights on. Wiring issues could also be to blame, such as a short circuit or broken wire, like when rodents chew through cables or connectors oxidize. I remember one time when moisture got into the switch after heavy rain, causing the lights to stay on. Another easily overlooked cause is a faulty control module. Modern cars have ECUs, and if the software glitches, the fog lights might go haywire. Safety comes first—fog lights that won’t turn off can drain the battery and confuse other drivers. Check the fuses right away, and if that doesn’t work, take it to a professional repair shop. Don’t force a fix yourself, or you might end up with bigger problems.

[SanKayden]

As someone with some knowledge about vehicles, I believe that fog lights that won't turn off are mostly due to electrical system issues. The most common problem is a faulty switch, where internal mechanical parts get stuck or contacts burn out. Relay failure is also highly likely - relays are responsible for opening and closing circuits, and if the coil is damaged or contacts fuse together, the fog lights stay powered. Wiring issues like short circuits can allow current to bypass the switch and not follow the normal path. Then there's the control modules in modern cars - if the ECU receives incorrect signals, it may keep the fog lights on. For inspection, check the fuse box to confirm if any fuses are blown; using simple tools like a multimeter to test circuit continuity is most convenient. I recommend regular maintenance of electrical components and prompt technician inspection when issues arise to prevent safety hazards from worsening.

[Pires]

I just started learning to drive recently and got a bit nervous when the fog lights wouldn't turn off. Maybe I pressed the wrong switch position - some car fog light buttons have complex designs that can easily confuse the modes. Or perhaps the switch itself is broken and the button won't press down. A loose wiring connection could also prevent the signal from transmitting. When the battery is severely drained, the system may malfunction, causing the fog lights to turn on automatically and stay on. Check the user manual for the correct operating procedure, try restarting the vehicle, and if that doesn't work, contact professional technicians at the 4S shop. As a beginner, don't force it to avoid making mistakes.