What is the reason why the car key cannot start after replacing the battery?

1 Answers
EliasDella
07/30/25 5:07am
The reason why the car key cannot start after replacing the battery: After replacing the car key battery, synchronization learning is generally required to start the car. Not all battery replacements require synchronization. If the remote control battery is disconnected for more than five minutes, it will lose memory, and synchronization is necessary for remote control and starting the car. Place the smart key close to the induction area with a key symbol on the steering wheel side, hold the start button for at least 10 seconds until all the dashboard lights come on, indicating successful synchronization. Then, press the start button while holding the brake to use it normally. This method also applies to newly paired smart keys for the first-time synchronization authentication. When replacing the key battery, be careful not to use excessive force or damage internal components, especially the battery base, which may result in no remote control after battery replacement, as well as the smart coil, which, if damaged, will prevent the car from starting.
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