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What is the reason why the car still has power after removing the key?

1 Answers

LeLucas

07/29/25 11:48pm

If the power remains on after removing the key, it may be due to a damaged or worn key switch, or it could be caused by a short circuit in the electrical wiring that leads to switch failure. 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 each press of the transmission switch button sends a signal once. 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 through a distributor for demodulation, where it is compared with the demodulator's identification code.

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