What is the reason for the 21st generation Corolla not making a sound when locking the car?

[SophieDella]

Carola locking the door without sound may be due to a loose wire or a malfunction. The sound when locking the car is produced by the relay in the anti-theft controller connecting to the horn. Below is a brief introduction about the Corolla: Safety: Equipped with GOA body structure, VSC (Vehicle Stability Control), curtain airbags, and side airbags, it thoroughly considers both active and passive safety, achieving world-class safety performance in its class. Interior: The overall style is simple, the dashboard design is conventional, the seats are spacious and comfortable, the air conditioning is effective, and the craftsmanship is good.

[DiGemma]

My 2021 Corolla also experienced the issue of no sound when locking the car. After some exploration, I found it might be a setting problem. After starting the car, press the menu button to find the vehicle settings, where there is a security option. Turning on the lock confirmation sound function solved the issue. If there’s still no sound after this operation, check if the horn wiring is loose or if there’s poor contact at the security horn connector on the left side of the engine compartment. Additionally, occasional crashes of the onboard computer can temporarily disable the function. Disconnecting the negative terminal of the battery for one minute and reconnecting it can reset the system. If all else fails, visit the 4S店 (dealership) to use a specialized computer to diagnose the security module. Although the probability of hardware failure is small, it’s not impossible.

[LeMason]

As a seasoned Corolla driver with three years of experience, I've dealt with the issue of no audible lock confirmation several times. The most common cause is accidentally disabling the sound via the car key fob. Try holding down both the lock and unlock buttons for five seconds to see if you can reactivate it. If that doesn't work, open the door and check if the red security indicator light on the driver's side door frame is flashing. If it's not, it means the anti-theft system isn't activated, and you'll need to inspect whether the anti-theft fuse in the fuse box has blown. Another often overlooked reason: when installing aftermarket GPS or anti-theft devices, wire cutting may interfere with the original horn control circuit. It's best to have the installation shop recheck the wiring.

[Wendy]

I've encountered the issue of no sound when locking the 2021 Corolla before. The problem lies in the settings. After starting the car, open the center console screen, enter the vehicle settings menu, find the door lock options, and check the remote feedback sound option. If the settings are correct but there's still no sound, consider that the remote key battery might be running low - replacing the battery usually solves it. Additionally, my friend's car had a faulty driver's side door lock sensor causing the system to misjudge the door as open, hence no sound feedback. In this case, the dashboard would display a door ajar warning. Replacing the door lock assembly cost just over 200 yuan to fix.

[LeonardoLee]

I've studied the repair manual for the 2021 Corolla regarding the no-horn issue when locking the car. First, try pressing the lock button with the key close to the vehicle. If the lights flash normally but there's no sound, it's likely a problem with the security horn, located behind the plastic cover inside the left front wheel arch. If the lights don't flash at all, it might be a software bug in the body control module, requiring a reprogram at the dealership. I've noticed this issue tends to occur more frequently on rainy days, possibly due to moisture in the sensor connections - spraying WD40 on the wiring connectors usually solves it. Important: never attempt to remove the door panel yourself as the wiring inside is too complex and easily damaged.

[McGriffin]

My Corolla used to make a sound when locking the car after I first bought it, but suddenly there was no sound later. The mechanic taught me to first check if the vehicle is in transport mode, which turns off all alert sounds to prevent battery drain during transportation. The method to deactivate it is to insert the key, power on without pressing the brake for 30 seconds, and then power off. If that doesn't work, consider a relay issue: the second green relay in the engine compartment fuse box controls the anti-theft horn—pull it out and shake it to listen for any loose parts inside. Another less common situation is compatibility issues after a car infotainment system update; the sound returned after I upgraded the system version. Finally, it's recommended to regularly clean the dust in the key card slot, as oxidized contacts can also cause signal abnormalities.