What is the reason for the autohold not responding when pressed?

[VonHailey]

autohold is an automatic parking system. The reason it may not light up could be that the car is not in the started state, the door is not properly closed, the ESP is not functioning correctly, or the seatbelt is not fastened. Here is some additional information: 1. Implementation conditions: AUTOHOLD relies on an intelligent braking system, and only vehicles equipped with brake control systems like ESP can implement the AUTOHOLD function. 2. Principle: The AUTOHOLD automatic parking function provides accurate parking force through a slope sensor controlled by the controller. When starting, the parking control unit calculates information provided by the clutch distance sensor, clutch engagement speed sensor, throttle pedal sensor, etc. It automatically releases the parking brake when the driving force exceeds the driving resistance, allowing the car to start smoothly.

[Sienna]

I recently encountered an issue with the autohold function in my family car—the button didn't respond when pressed. At first, I thought the button was broken, but after checking, I realized I hadn't firmly pressed the brake when activating it while parking. The autohold system requires the vehicle to come to a complete stop; otherwise, it won't activate. Later, when I asked at the repair shop, the mechanic mentioned it could be due to poor button contact or loose wiring, possibly from water ingress or aging. Another reason could be low battery voltage, as the electronic system may disable some functions in power-saving mode. A reminder to everyone: if you face this situation, don’t rush to operate it. First, try restarting the vehicle to see if it recovers. If the issue persists, it’s best to have a professional inspect the brakes and electronic control unit—safety comes first.

[McReagan]

As someone who has repaired many cars, I've encountered situations where the autohold function fails, mostly due to physical damage to the button or a blown fuse. Frequent button presses can wear out the contacts, or loose wiring connections may cause signal transmission failure. It could also be caused by faults in other vehicle systems affecting the autohold, such as issues with the ABS sensor or errors reported by the parking brake module. When driving daily, ensure that the system's prerequisites are met, like the engine being started and doors properly closed. For diagnosis, you can first use a multimeter to check circuit continuity or try replacing a small component. Simple maintenance can prevent major issues, saving both hassle and money.

[VonAubrey]

After playing with cars for a long time, I think the autohound not responding is sometimes just an electronic bug. Modern car software is complex, and system overload or accidental triggering of safety locks can cause the button to not respond. For example, driving mode selection conflicts or dirty sensors affecting judgment. Try restarting the engine or disconnecting the negative battery terminal for a few minutes, which usually resets it. Related functions like hill-start assist may also fail in conjunction, especially in rainy weather. Don't easily trust DIY repairs online; safety comes first. Getting an original factory inspection is the most reliable, as high-tech stuff requires precision.