On social media platforms on February 26, 2026, many car owners were testing one thing—whether their own cars would also turn off the headlights via voice commands while driving.
It all started yesterday, when a seemingly accidental incident caused an uproar in the automotive community: while a certain brand's vehicle was driving at night, a passenger inside mistakenly turned off the headlights via voice command. The sudden darkness left the driver unable to react in time, resulting in an accident.
After the incident escalated, a car owner of the involved brand revealed to Gasgoo that they had long discovered similar issues and shared their makeshift solution: if the lights are accidentally turned off, quickly pull and hold the high beam lever to barely keep the headlights on.
What is even more intriguing is that some car owners found after testing that this is not a common flaw in all NEVs (New Energy Vehicles); the infotainment system of their own models directly refuses to execute the "turn off lights while driving" command.
This raises a core question: as smart cars, why do some obediently turn off the lights when commanded, while others can hold the bottom line?
Why Can Headlights Be Controlled by Voice?
To figure out this problem, we first need to look at how cars are designed nowadays.
Walking into today's new car showrooms, you will notice a trend: fewer and fewer physical buttons, with a single large screen handling everything. This "minimalist style" is learned from smartphones; it indeed looks clean and is packed with a sense of technology. The headlight knobs on traditional cars that allowed for blind operation are either stuffed into screen menus or handed over directly to voice control.
In the eyes of product managers, this logic seems flawless: since you can say "turn off the flashlight" to your phone, why can't you say "turn off the headlights" in the car?
But the problem lies right here: if a phone crashes, it can be restarted; if the headlights go out, it could be a matter of life and death.
The deeper reason is that today's cars are no longer traditional "mechanical connections" but "software-defined." In the past, the headlight switch was just a physical button; you press it, the circuit connects, and the lights turn on—simple and direct. Things are different now. Cars have a central brain (domain controller), and headlights, air conditioning, and windows have all become "actuators" controlled by code. As an input channel, the voice system can theoretically adjust anything.
At this point, if engineers don't keep an eye out during design and don't add the "turn off headlights while driving" command to the blacklist, the voice system will obediently comply upon receiving the command. After all, it is just a piece of code; it doesn't know what "turning off the lights" means on a highway.
The makeshift solution shared by that car owner precisely illustrates a problem. When the voice system messes up the headlight logic, users can only resort to the most primitive method (forcibly activating the high beams) for an emergency, and ultimately have to rely on the "restart trick" to restore the infotainment system to normal. This operation is just like restarting your phone when it crashes. But a car is not a phone; there is no time to slowly restart it on a highway.
To put it bluntly, the reason headlights can be bullied by voice commands is not because of their low technical content, but because they are treated as an ordinary "switch" in the world of code, losing their rightful status as a safety component.
Why Do Some Cars Refuse to Turn Off the Lights?
As more and more test videos emerge, an interesting phenomenon has appeared: not all cars are this "obedient."
Owners of other models from the same brand have found that attempting to turn off the lights via voice while the vehicle is in Drive (D gear) results in the infotainment system directly refusing to execute the command. Both use voice control, so why is the gap so huge?
The answer is: some cars have added a "safety gate" between the voice system and the headlights.
To put it bluntly, when the voice system receives a command, it does not execute it immediately but first asks a few questions: What is the current vehicle speed? Is it day or night? Is the vehicle in motion? If it determines that the combination of "nighttime + high-speed driving + turning off lights" poses a safety hazard, the system will automatically reject the command or require secondary confirmation.
And those "obedient" cars that turn off the lights most likely bypassed this safety gate.
To a certain extent, this reflects the differences in the understanding of "intelligence" among different automakers, or even across different projects within the same automaker. Just as owners of other brand models under the group involved in this accident reported, their infotainment systems will ask "Is it safe?" before trying to "understand you."
From a technical perspective, implementing this safety gate is not difficult. The challenge lies in whether automakers are willing to invest effort into this "invisible safety feature" at a time when they are pursuing cool technologies like voice-based large language models (LLMs) and end-to-end AI. After all, users rarely give good reviews because "this car refused me in a dangerous situation," but they easily complain that "this car doesn't even understand how to turn off the lights."
The significance of that safety gate is not just to block a mistaken operation, but more importantly, it could potentially block a lawsuit afterwards.
As the impact of the accident expands, legal inquiries follow. Lei Wen, a lawyer at Guangdong Huaibo Law Firm, provided a professional legal analysis during communication with Gasgoo:
"According to Article 1203 of the Civil Code of the People's Republic of China, if a product defect causes harm to others, the infringed party has the right to choose to claim compensation from the producer or the seller. In this incident, if the situation where the vehicle's voice control mistakenly triggers the headlight shutdown and lacks a physical emergency control method constitutes a product defect, the car owner, as the infringed party, has standing and a legal basis to sue the producer and the seller."
Lei Wen further pointed out that whether the automaker has fulfilled its obligation to inform will directly affect the extent of compensation liability:
"If the physical buttons for the vehicle's headlights are unreasonably set up and placed too obscurely, and the producer and seller have not provided sufficient prompts and explanations regarding relevant operations, failing to fulfill the obligation to inform, the automaker should bear full compensation liability for the accident losses; if a complete user manual, operating specifications, and safety precautions have been delivered with the vehicle, and a reasonable obligation to inform has been fulfilled, the automaker's liability may be reduced at the court's discretion."
This actually gets to the heart of the matter. The makeshift solution of "pulling and holding the high beam lever + restarting" shared by that "veteran driver" sounds like folk wisdom, but if only veteran owners know this trick and no one teaches new users, how would the court view it after an accident occurs?
Therefore, those cars that refused to execute the light-off command during testing blocked not just a voice command, but potentially also saved the automaker from a court summons.
Final Thoughts
The "voice-controlled headlight shutdown" issue, when it comes down to it, is not an exclusive problem of a single brand, but a pitfall the entire industry accidentally stepped into while pursuing "intelligence." It's just that some stepped in deeper than others.
We are too eager to turn cars into mobile intelligent agents, too eager to make them responsive to every request, to the point of forgetting the most basic thing: a car is first and foremost a means of transportation, and safety is always the bottom line. Those cars that refused to turn off the lights during testing are not less intelligent; on the contrary, they better understand what true intelligence is.
After all, the light that illuminates your way home should not be accidentally turned off in the dead of night.