What is the flashing red dot in the car?

[Lee]

A flashing red dot inside the car is the indicator light of the vehicle's anti-theft system. After locking the car, if it does not flash, it indicates that the car is not properly locked or the anti-theft system has malfunctioned; if it flashes, it means the anti-theft system is functioning normally. The functions of the car anti-theft system are: Automotive electronic anti-theft refers to the use of electronic signal transmitters and receivers to achieve anti-theft functions. The electronic anti-theft system mainly consists of an electronically controlled remote or key, electronic control circuit, alarm device, and actuator. The key has a chip that amplifies this signal when near the ignition lock. The anti-theft computer will identify whether the key is legitimate. If legitimate, it allows the engine to start; if not, the engine will not start. By locking the ignition switch and prohibiting vehicle startup, the purpose of car anti-theft is achieved. Once in "anti-theft" mode, an audible alarm is triggered. If there is a problem with the anti-theft system, it should be repaired at a 4S shop; otherwise, the car is at risk of being stolen by criminals. If the car is not used for a long time, the battery's negative terminal can be disconnected, but this will stop the anti-theft system from working. Therefore, if the car is not used for an extended period, it is beneficial to drive it around occasionally, which is good for both the car and the battery. Long-term parking accelerates the aging of some car components. With technological upgrades and improvements, modern vehicles are almost all equipped with electronic locks. When the electronic lock is activated, a flashing red light appears, which is a normal phenomenon. The advantage of electronic locks is that there is no keyhole on the outside of the door, and the fuel tank cap has anti-theft treatment. Nowadays, car thefts are becoming increasingly rare. The main types of electronic anti-theft systems include: key-controlled, remote-controlled, alarm-type, and anti-theft systems with both alarm and vehicle immobilization features. In case of theft attempts, besides sounding an alarm, these systems can also cut off the car's starting circuit, ignition circuit, or fuel line to prevent the car from being moved.