The tail lights of your car are generally used for driving the car at night, at twilight hours and in bad weather conditions such as the rain and snow. The main purpose of tail lights in your car is it illuminates in the rear of the car and turn on when the flip of the switch turns on the headlights. But new models of the car, the automatic sensors are used for turning on the tail lights to detect the drops in ambient brightness. The following video helps you to define the reasons behind the tail lights of your car is not working properly.