Why does the lock light not illuminate but the unlock light works?
2 Answers
The reasons why the lock light does not illuminate but the unlock light works: 1. The engine hood, doors, or trunk are not properly closed; 2. Open the engine compartment cover and check if the rubber pads near the upper edge of both headlights are still present. There is a sensor below the corresponding rubber pad, and the rubber pad must press on the sensor for normal operation. The car remote locking system mainly consists of two parts: the transmitter and the receiver: 1. Transmitter: Composed of a transmission switch, transmission antenna (keyboard), 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 is selected according to the radio standards of the country of use, and the transmission switch sends a signal each time it is pressed. 2. Receiver: After the transmitter sends the identification code via 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. The demodulated identification code is then compared; if it is the correct code, it is input into the control circuit to activate the actuator.
I encountered the same issue last time. The lights don't illuminate when locking but work when unlocking, indicating the indicator lights themselves are fine. It might be a misconfiguration in the body control module settings. Some cars allow you to disable the locking indicator lights in the system settings—check the vehicle settings option on the central display. If the settings are correct, it's likely due to poor contact in the lock button. Open the key fob and clean the button contacts with a cotton swab dipped in alcohol. Additionally, low battery in the remote can weaken the locking signal—try replacing the battery. Here's another tip: use the mechanical key to lock the car and see if the lights come on. If they do, it's definitely a remote issue. Don't delay fixing this—if left unchecked, you might end up unable to lock your car one day.
