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Why does one side of the car light stay on while the other side is off when locking the car?

2 Answers

KeeganMarie

08/27/25 4:13am

The reason why one side of the car light stays on while the other side is off when locking the car may be due to a damaged small light. It is recommended to go to a repair station for inspection, as this is generally not a major issue. Alternatively, one of the fuses connected to the turn signal line of the anti-theft device may have blown, and replacing it should resolve the problem. Below is an extended introduction: Car locking introduction: The car locking remote utilizes the wireless remote control function of the central locking system, allowing the doors to be opened or locked from a distance without inserting the key into the lock. The working principle involves the key emitting a weak radio wave, which is received by the car antenna. The electronic control unit then identifies the signal code, and the system's actuator (motor or electromagnetic coil) performs the action of opening or locking. This system mainly consists of two parts: the transmitter and the receiver.

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JudeAnn

09/09/25 3:17am

I once encountered a situation where one side of the car lights was on while the other side was off when locking the car. This is usually caused by issues in the electrical system. One side's bulb may have burned out, such as a broken filament or oxidized contact points, preventing current from passing through; or a fuse may have blown, as the current fluctuation during locking can easily trigger the fuse's protective action, especially in older cars. There might also be a fault in the body control module—if the module responsible for the locking light signal on one side malfunctions, it can affect the lighting balance. Additionally, loose or corroded wire connections are common factors, particularly after rainy or humid conditions. This situation is actually quite dangerous because it affects the vehicle's visibility at night and could develop into more serious electrical issues. I recommend first turning on the lights to check which side isn't working, then trying to replace the bulb or fuse. If there's no improvement, take the car to a professional shop for a full diagnosis.

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