What is the reason for not detecting the smart key?
2 Answers
If the car does not detect the smart key, it may be because the remote control battery is dead, or there is signal interference near the vehicle. If there is a signal interference source at your location, you can directly press the key to start the car; if the key is out of power or has battery issues, you need to replace the battery; if the key chip cannot be read or the transmitter/receiver may be faulty, you can try using a spare key. Functions of the smart key system: keyless entry function—when the key is near the car body, the door automatically unlocks and disarms the anti-theft alarm; automatic window closing and arming function—when the key is 3-5 meters away from the car body, the door automatically locks and enters the anti-theft alarm state, and the windows will automatically close; wireless remote control function—the wireless remote control distance is not less than 20 meters; anti-theft alarm function—in the anti-theft alarm state, if a side door is triggered or an ACC signal is triggered, the system will start an alarm. Precautions for smart keys: Do not place the key together with electronic devices, as smart keys use low-intensity radio waves and may not work properly under magnetic interference; do not leave the spare key in the car—if the car key is lost due to poor management, it will cause many troubles, especially for smart car keys. Once lost, not only does it need to be recreated, but it also requires re-matching with the car's computer.
I've been driving for decades and have seen too many cases of key detection failures. The most common issue is a dead battery in the key fob itself, especially when the battery hasn't been changed for two or three years. The key emits a weak signal that the car simply can't receive. Additionally, sometimes the key gets pressed by other items in a bag or is too far from the car—like trying to start it from three meters away—which makes it easy to miss the signal. Environmental interference is also a frequent culprit, such as too many electronic devices in a parking lot or metal structures blocking wireless transmission. Once, I couldn't start my car at a supermarket entrance and later realized my phone was interfering with the key. My advice is to try replacing the battery first. If that doesn't work, check the position of the key slot and remember not to misplace the key. If the problem persists, it's best to visit a professional shop to inspect the receiver module or explore backup solutions—don't compromise driving safety. Preventive maintenance can save a lot of trouble.
