What is the use of car daytime running lights
Improve vehicle visibility during the day and reduce traffic accident rates
Core function: Enhanced vehicle recognition
The daytime running light (DRL) is a specially designed daytime signal lamp, mounted on the front of the car body its main purpose is to improve the visibility of the vehicle in complex light environments through brightness contrast, rather than illumination. For example:
In areas with light changes such as rainy, snowy days or tunnel entrances and exits, light-colored vehicles are easy to blend into the environment, and DRL can make them more eye-catching.
Nordic countries (such as Sweden) were the first to force the use of DRL due to perennial snow reflection, and data show that it reduces the accident rate by 5%-20%.
Safety benefit: reduce accident risk
Multiple studies have shown that DRL improves safety through the following mechanisms:
Shortened reaction time : The human eye is more sensitive to brightness contrast, and DRL enables other drivers to detect vehicles 0.5-1 seconds earlier, reducing vehicle-to-vehicle collisions (by about 12%).
Special scene optimization : for example, when driving in reverse light, black/gray vehicles are easy to be "invisible" by strong light, DRL can significantly improve this problem.
Design and use characteristics
automatic control : Modern vehicles usually automatically turn on the DRL as soon as they start, and automatically dim or turn off after turning on the low light.
low energy : LED technology, very low power consumption, does not affect the battery life.
non-lighting use : brightness is not enough to provide lighting for night driving, need to be distinguished from low light or fog lights.
Added value and misunderstanding
Aesthetics and brand identity : some models use DRL as a design element to enhance visual recognition (such as Audi's "Lamp factory" style).
Common misconception :
waste misunderstanding : LED DRL power is only 3-5 watts, far lower than traditional headlights.
function replacement misunderstanding : can not replace fog lights or night lights.
summary : Daytime running lights are a low-cost and efficient solution to improve the safety of daytime driving, especially for the environment with variable light lines or low contrast. Their design takes into account functionality and aesthetics, and has become one of the standard configurations of modern vehicles.
The following is a detailed investigation and solution for car daytime running lights not on, arranged by priority and common fault order:
Check vehicle Settings
In some models, such as the Volkswagen Passat, daytime running lights can be manually turned off through vehicle Settings. If it is closed by mistake, it needs to be reopened:
Example : Turn off the ignition → Lift the turn signal up and turn left → hold for more than 3 seconds and turn on when prompted.
Troubleshoot the bulb
one side is not on : The priority is to check whether the bulb on the side is burned, the filament is broken or the lamp strip is aging (common LED daily running lights), and the bulb or lamp strip of the same specification needs to be replaced.
both sides are off : If the bulb is normal, further check other components.
Check the fuse
A blown fuse will cause both day running lights to fail (a single failure is usually not a fuse problem).
Procedure :
Consult the vehicle manual to locate the day light fuse location;
Check whether the fuse is blown and replace it with a new fuse of the same specifications.
Test circuit and plug
line problem : Check whether the headlamp plug is virtual connection, the wiring harness is corroded or short circuit, repair the damaged line or re-fix the plug.
abnormal voltage : Use a multimeter to measure the plug voltage. If the power supply is abnormal, check the halo driver or headlight control module.
The switch or control module is faulty
switch fault : Test whether the daily running light switch is in poor contact or damaged, and replace it with a matching model.
module fault : Damp or damaged headlamp control module will interrupt signal transmission, need professional diagnosis and replacement.
Professional maintenance advice
If the investigation is fruitless, or involves complex circuit problems (such as module programming), it is recommended to contact the 4S shop or professional maintenance shop to avoid misoperation to expand the fault.
Precautions :
Be sure to turn off the engine and disconnect the battery before servicing to prevent electric shock.
The daily running light is a signal light, non-lighting purpose, using LED technology energy-saving and efficient, automatically lit after starting the vehicle.
Through the above steps, most of the daily running light faults can be effectively solved. If the problem persists, there may be a hidden circuit problem that requires further professional testing.
If you want to know more, keep reading the other articles on this site!
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