What to Do When a Mercedes Key is Locked in the Trunk?

1 Answers
GenevieveLynn
07/30/25 7:43am
Choose to use a spare key or visit a 4S repair 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., it contains an identification code storage circuit and an amplitude modulation circuit, with a button-type lithium battery installed on the opposite side of the circuit. The transmission frequency uses radio waves, and pressing the transmission switch button once sends a signal once. 2. Receiver: After the transmitter sends an 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 demodulator's identification code.
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