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What is the reason for the buzzing sound when remotely locking the car door?

1 Answers

LaylaDella

07/29/25 4:12pm

This is caused by a damaged door lock actuator and requires repair at a 4S shop. The basic components of a remote key consist of the following two points: 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, and the transmission switch button sends a signal once each time it is pressed. 2. Receiver: After the transmitter sends the identification code using shortwave modulation, it is received by the car's shortwave antenna and enters the shortwave high-frequency amplification processor of the receiver's electronic control unit via a distributor for demodulation, where it is compared with the identification code in the demodulator.

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