What is the purpose of the daytime running lights on a car?
Daytime running lights are mainly used to enhance the visibility of the vehicle during the day, making it easier for other road users to spot the vehicle, rather than for illumination.
Enhancing driving safety: By emitting bright light, it significantly reduces the accident rate during the day, helping pedestrians and cyclists to detect vehicles earlier.
Cannot replace low beam lights: Its brightness is insufficient to illuminate the road, and it cannot replace the low beam lights at night or in low-light conditions. Moreover, some models' tail lights do not light up when the daytime running lights are turned on.
Automatic activation without operation: The vehicle will automatically light up after starting, and it is usually not possible to manually turn it off. The driver does not need to perform additional operations.
Most of the time, the original factory daytime running lights not being on will affect the annual inspection. However, this depends on the vehicle model configuration, regional standards, and the degree of inspection strictness. The safest option is to repair it before the annual inspection.
How to determine the condition of your car
Original factory daytime running lights: If both sides are not lit, it is basically not passable. If only one side is not lit, it may be allowed in some regions but the risk is high.
No daytime running lights configuration in old vehicles: It does not affect the annual inspection.
Added later without registration: 100% unqualified, it must be removed or registered.
Core lights (headlights, brake lights, turn signals): These are definitely not passable if they are broken.
Regional standards vary
Some regions only check core safety lights, and daytime running lights are not mandatory for inspection.
As the inspection standards tighten, more and more regions have included the original factory daytime running lights as a mandatory inspection item.
First-tier cities like Beijing and Shanghai have stricter inspections.
Daytime running lights broken does not affect legal driving and usually does not result in a fine, but it will reduce visibility during the day and may lead to an annual inspection failure; it is recommended to temporarily turn on the low beam lights as a substitute and promptly investigate and replace the faulty parts.
Core response steps
Temporary remedy: During daytime driving, actively turn on the low beam lights or position lights (make sure to turn them off when parking to prevent battery depletion), to compensate for the safety function of being "seen".
Quick self-check: Confirm if the settings were mistakenly turned off and check if the fuse is blown (if both sides are not lit, it is mostly a fuse problem; if only one side is not lit, it is mostly a fault in the bulb/module).
Professional repair: Go to a repair shop to test the LED driver module, wiring harness, or headlight assembly, and replace the corresponding components based on the degree of damage.
Annual inspection notice: If the original factory daytime running lights are standard, it must be repaired before the annual inspection, otherwise, it may fail due to the failure of the external lighting device.
Fault causes and repair costs reference
Common causes: Fuse blown, LED bulb/module burned out, driver failure, poor contact in the wiring harness or malfunction of the control module.
Repair cost: For ordinary vehicles, replacing the LED module costs approximately 200-600 yuan (including labor); if integrated in the headlight assembly or in high-end vehicles, it may cost thousands of yuan; for only bulb-type faults, it is about 50-200 yuan.
Decision advice: In urban areas for short-term sunny days, it can be postponed. For those who frequently travel on highways, cloudy or rainy days, or sections with heavy traffic, it is recommended to prioritize repair; if one side is not lit, it is prone to causing asymmetric light and has a risk of misjudgment, and it is not advisable to ignore it for a long time. Special Note
Night driving: The malfunction of daytime running lights does not affect driving safety at night. Since it is mandatory to use low beam headlights at night, the daytime running lights usually turn off automatically.
Do not attempt to modify by yourself: Non-professionals should not attempt to disassemble the circuit or connect wires. This could cause short circuits or vehicle malfunctions; if you need to do DIY replacement, please strictly match the model and operate with power off.
Regulations: Currently, the "Road Traffic Safety Law" does not list daytime running lights as a mandatory item to be turned on during the day. There are very few cases of being punished solely for this reason. However, in some strict regions or for certain vehicle models (with integrated outline light function), there may be differences in law enforcement. Safety is the top priority, so the safest option is to follow the regulations.
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