Reasons for the failure of the key remote control after changing the car battery:

1. Such a smart key can emit infrared signals, which can open one or two car doors, luggage compartment and fuel filling hole cover, and can also operate the windows and sunroof of the car. A more advanced smart key is like a credit card. , When the driver touches the door handle, the central lock adjustment system in Key Shell starts to work and transmits a wireless query signal. After the smart key card responds accurately, the car lock opens automatically. The engine will only start when the central processing unit senses that the key is stuck in the car;
2. Such a system uses RFID (Radio Frequency Identification) technology. Under normal circumstances, when the car owner approaches the vehicle within about one meter, the door lock will automatically open and release the anti-theft; when leaving the vehicle, the door The lock will be automatically locked and enter the anti-theft state. When the car owner enters the car, the in-car inspection system will immediately recognize the smart card. At this time, just slowly press the start button (or knob) to start the car normally. The car key does not need to be taken out during the whole process;