The dome light bulb is the light bulb mounted on the roof of the interior of the vehicle. It is usually located towards the center, near the rearview mirror. Its purpose is simply to provide illumination for the passengers in dark situations, such as when driving at night or in parking structures. For some vehicles the dome light bulb also doubles as the courtesy lamp bulb, which comes on automatically when the vehicle doors are opened. While the light provided by the dome light is not necessarily important to the performance or safety of the vehicle, it is a convenient feature that makes the driving experience more comfortable for the passengers. When the dome light bulb fails, this feature will be disabled, which may leave the vehicle's passengers without light in dark situations. Usually a bad or failing dome light bulb will produce a few symptoms that can alert the driver of a potential problem that should be serviced.
1. Dome light is dim
One of the first symptoms commonly associated with a bad or failing dome light bulb is a dome light that shines dimly. If the dome light bulb wears out it can cause the light to shine less brightly than before. The light may shine noticeably dimmer if the bulb is near the end of its service life.
2. Flickering dome light
Another common symptom of a problem with the dome light bulb is a flickering dome light. If the dome light bulb filament wears out or becomes damaged this may cause the dome light to flicker rapidly when it is turned on. The dome light will continue to flicker until the bulb completely fails.
3. Dome light does not function
The most definitive symptom of a problem with the dome light bulb is a dome light that does not function. If the dome light bulb burns out or fails, it will disable the dome light feature until the bulb is replaced.
While the dome light bulb is not critical to the safety or performance of the vehicle, it does provide a convenient feature that makes the driving experience more comfortable for the passengers. If your dome light has burned out or is not functioning correctly, a technician from YourMechanic can come to your home or office to replace your dome light bulb for you.
This article originally appeared on YourMechanic.com as Symptoms of a Bad or Failing Dome Light Bulb and was authored by Ed Ruelas.