What's the matter with the classic Focus remote key not being able to lock the car?

[LaLucia]

Insert the remote key, lower the window glass of the driver's seat, press and hold the remote unlock button, quickly turn the key from position 0 to position II (do not wait for power-on), and repeat 5 times. Service life: The battery life of the car remote key is generally about 3 years. When the battery runs out, you need to open the key shell to replace the new battery. Friends with strong hands-on ability can open the key shell and replace it by themselves, which is relatively simple. Precautions: There is a chip inside the car's remote key. During the disassembly process, be careful not to damage the chip of the remote key, otherwise it will be troublesome and expensive to replace a new chip. The shell of the remote key is generally not waterproof, so friends should never soak the remote key in water, as this will damage the chip. When using the remote key, try to avoid remote control from a long distance, as this will increase battery consumption.