Why can the remote key unlock but not lock the car door?

1 Answers
EmiliaMarie
07/30/25 6:59am
First, check whether the indicator light on the remote flashes when unlocking. If it doesn't flash, the issue lies with the remote itself. If it flashes but the vehicle's central control shows no response, troubleshoot the central locking system's unlocking circuit accordingly. The basic components of a remote key consist of the following two parts: 1. Transmitter: Composed of a transmission switch, transmission antenna, integrated circuit, etc., containing an identification code storage circuit and amplitude modulation circuit, with a button-type lithium battery installed on the opposite side of the circuit. The transmission frequency uses radio waves, sending a signal once per press of the transmission switch button. 2. Receiver: After the transmitter sends the identification code via shortwave modulation, it is received by the vehicle's shortwave antenna, then enters the receiver's electronic control unit through a distributor for demodulation via a shortwave high-frequency amplification processor, and is compared with the demodulator's identification code.
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