Why does the car key not respond when locking the car?
2 Answers
If the car key does not respond when locking the car, it may be due to a dead battery in the key or strong surrounding interference. 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 on the opposite side of the circuit. The transmission frequency uses radio waves, and pressing the transmission switch button once sends a signal. 2. Receiver: After the transmitter sends the identification code using shortwave modulation, it is received by the car's shortwave antenna and processed by the distributor into the receiver's electronic control unit for shortwave high-frequency amplification and demodulation, where it is compared with the demodulator's identification code.
I often receive this question from fellow car enthusiasts. The most common reason for the car key not responding when locking is a low battery in the key fob. If the battery has been used for two years, it's time to replace it. Signal interference can also cause malfunction, such as when parked near charging stations in parking lots or in areas with strong signals, where interference sources block signal transmission. Vehicle-specific issues like a stuck door lock motor, faulty body control module, or power system problems should also be checked. I recommend starting with the simplest solution: try replacing the key fob battery. If that doesn't work, restart the vehicle's power—turn off the engine and wait a few minutes before restarting. Pay attention to whether the car flashes its lights or makes a sound when you try to lock it with the key nearby. If there's no response, it indicates a signal reception issue. In daily use, avoid exposing the key to moisture or dropping it, and keeping it clean can prevent malfunctions. If all else fails, use the spare key as an emergency measure. Don't underestimate this issue, as it can easily lead to safety hazards.
