Malfunctioning low-beam headlights are often caused by broken dimmer switches, burned-out light bulbs or broken running-light relay switches. If the problem is electrical, it is important to take the vehicle to a qualified mechanic for diagnosis and repair.Know More
In some cases, there is nothing wrong with the low-beam headlights other than the fact that the headlight covers have become cloudy or dirty, preventing light from escaping. Cleaning the covers with toothpaste usually eliminates this problem.
The dimmer switch on a vehicle is located on the steering column, dashboard or foot board. When the switch no longer makes the correct connection with the car's electrical system, the low beams will not activate. Consequently, the high beams might work, but the low beams do not.
A burned-out light bulb could also cause low-beam lights to malfunction. However, this usually means that the headlights will not work regardless of the dimmer switch setting. Turning on the headlights while facing a blank wall is the easiest way to tell if the bulbs are unable to work at any setting.
Relay switches are also common reasons for malfunctioning headlights. The magnetic switch that, in modern vehicles, is controlled by the car's computer system. If the running light relay malfunctions, the low-beam headlights will not work.Learn more about Car Parts & Maintenance
Clean automobile headlights using a kit from the automotive parts store. Use the abrasive to remove the clouding and yellowing of the plastic lens due to sunlight. Polish the scratches from the lens and apply the protective sealer.Full Answer >
Sylvania claims that its Silver Star Ultra headlights are the brightest on the market as of 2014, with 50 percent brighter lights than standard halogen lights. Other very bright headlights include Putco Pure Halogen Headlight Bulbs, PIAA Xtreme White Bulbs and Vision X Superwhite Headlight Bulbs.Full Answer >
Basic automatic headlights work through sensors that detect how much light is outside the vehicle. Most times, these sensors are located on the dash of the vehicle. The headlights turn on when the sensors detect a certain level of darkness.Full Answer >
Cleaning headlights requires sanding, polishing and applying sealant to the lenses. Most modern headlights are made from a strong plastic polycarbonate that fades in time due to the sun's ultraviolet rays. Keeping the headlights clear is a maintenance procedure required to ensure a vehicle maintains optimal nighttime vision.Full Answer >