What Causes Car Tail Lights to Stay On?

[SanAsher]

Car tail lights staying on is due to a short circuit in the brake light switch, which requires replacement. If the issue is not with the brake light switch, it may be a fault in the car's electrical system. Owners should not attempt to fix this themselves and should instead seek professional help at a 4S store or a specialized repair shop. Brake lights are typically installed at the rear of the vehicle to enhance the penetration of the light source, making it easier for following vehicles to detect braking even in low visibility conditions, thereby helping to prevent rear-end collisions. Brake lights illuminate when the vehicle brakes and are usually red, effectively preventing rear-end collisions and reducing traffic accidents. They are bright and highly visible, primarily serving to alert following vehicles. Incorrect use or malfunction of brake lights can easily lead to rear-end collisions. Additionally, when replacing brake light bulbs, note that vehicle tail lights often serve dual purposes—each bulb contains two filaments: a weaker one for the parking light and a stronger one for the brake light. Some manufacturers design these as high-low pin plug-ins for convenience, but care must be taken during replacement to avoid incorrect installation.