Why doesn't the car beep when locked?

[AvaFitz]

The reasons why the car doesn't beep when locked are as follows: 1. The car key malfunctions. 2. Silent mode is activated. When silent mode is on, only the headlights flash when locking, without any audible alert. 3. The beeper for the alert sound is damaged. If the vehicle still doesn't produce the alert sound after pressing the mute button, it indicates that the beeper is damaged. Here are some precautions to note when locking the car: 1. You can use the mechanical key to lock the car. When using the mechanical lock, ensure all doors are properly closed and listen for the sound of all doors locking; otherwise, the car isn't successfully locked. 2. When using the electronic lock, observe whether the lights turn on after locking and if the car emits a locking sound. 3. After locking, pull the door handle again to check if the doors are securely locked.

[McEmery]

As someone who spends all day in repair shops, I've found that the most common reasons for a silent car lock are: either the owner accidentally turned off the alert sound (many cars now allow switching to silent mode by long-pressing the key), or the door sensor switch is stuck—especially during rainy days when contacts can rust, making the system think the door isn't properly closed. Another possibility is aftermarket electronic devices interfering with signal transmission, like a case last week where the horn stopped working after installing a GPS. The simplest self-check is to see if the side mirrors auto-fold or if the lock lights flash. If these actions are normal, there's a 90% chance the alert sound function was turned off, and you can easily reset it by checking the manual.

[LaBentley]

Last year, our family car suddenly stopped beeping when locked. After some troubleshooting, we found the cause: the locking horn was hidden behind the grille and completely clogged with mud. Hosing it down immediately solved the problem. Later, a mechanic told us this design is quite common, especially prone to clogging when driving on muddy roads in rainy weather. Here's a cool fact: some models automatically disable the alert sound when battery level drops below 30% to conserve power - those who've replaced batteries should check the voltage. Recently while helping a neighbor check their car, I noticed another interesting phenomenon: on vehicles with modified electric tailgates, the locking signal occasionally gets diverted, causing the horn to malfunction.

[DePeyton]

Just dealt with this type of fault last week. Using a diagnostic tool, three common causes were identified: the buzzer fuse in the body control module is blown, usually located in the seventh position of the fuse box under the steering wheel; poor contact in the key buttons leading to incomplete signal transmission; or incorrect wiring during the installation of an additional anti-theft device. If you're doing it yourself, it's recommended to first check the fuse—replacing it with a 15A one costs less than five yuan. If that doesn't work, pay attention to the car lights' response when locking the car. If the hazard lights work normally but there's no sound, it's likely a buzzer issue, a part that often fails in older cars.