When the Car key remote control is turned on, the engine control unit (ECU) on the car sends out a set of encrypted electronic code signals to the chip in the Car key remote control. Only when the car ECU unit can read the feedback and receive the correct anti-theft. The encoded signal allows the vehicle to start. Therefore, even if a simple Car key remote control does not have any buttons, the vehicle's anti-theft system can be turned on and off by internal chip coding. Car key remote controls with chips require special dedicated factory-matched equipment to be programmed.
In the automotive field, the chip is called a magnetic coupling forwarding system. The magnetically coupled forwarding system is essentially passive. The chip itself does not require a constant power supply, so there is no need to power up at all times. Simply pass the electromagnetic wave at a frequency of 125 kHz. Under the electromagnetic wave, the chip will generate its own coded signal, usually in the range of 1 cm to 15 cm. Since this is a radio frequency, it can penetrate the material so that the chip does not need to be exposed to the shape of a key head that can be made of plastic or rubber.
The process of key identification works in most car alarm system chips is basically similar. When a car chip key is inserted into the ignition lock, turning to the "on" or "running" position, the induction coil around the ignition lock is installed and an electromagnetic wave is sent. The windings are radiated on the key chip, and the power of the electromagnetic waves causes the electronic chip to emit a coded signal. This signal is usually an alphanumeric sequence, which is considered an identification code. The signal is read in the induction coil and sent to an ECU computer to identify the signal. If the signal is confirmed as a signal already in the ECU computer's memory, it is accepted by the ECU computer, and the ECU controls the vehicle's other electronic components to be set to allow the execution state, at which time the vehicle's engine can be arbitrarily operated to start.