What is the reason for the car remote key failure after replacing the battery?

1 Answers
CooperLynn
07/29/25 5:00pm
Car remote key failure after replacing the battery is due to code loss. Solution: 1. Insert the car key into the ignition and turn it repeatedly, being careful not to start the engine; 2. After repeating this four or five times, press and hold any button on the remote key to reprogram it and reactivate the key. The main function of a car remote key is to remotely lock and unlock the car doors. The principle involves emitting a weak radio wave from the key, which is received by the car's antenna. The electronic control unit (ECU) then identifies the signal code, and the system's actuator performs the locking or unlocking action. This system mainly consists of two parts: the transmitter and the receiver.
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