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

The remote control key is out of order, open the key shell, and need to re-match after replacing the battery. Insert the remote control key, turn it on to the "II" position, and then immediately reset to the "0" position. Repeat this 4 times and quickly pull out the key. Press any key, such as the unlock key for 4 to 5 seconds, and you hear a "click" in the car, and the key encoding is completed.