What is the button with an 'a' and a circle in a car?
1 Answers
In a car, the button with an 'a' and a circle is the auto-hold function button. Pressing it once activates the auto-hold function, and pressing it again deactivates it. The auto-hold function is an extension of the vehicle stability control system, which controls the four-wheel braking through ESP. During the auto-hold process, the ECU computer uses sensors installed in the car to determine the vehicle's levelness and wheel torque, deciding whether braking is needed to prevent rolling. The braking force applied to the wheels is not excessive—just enough to stop the vehicle from moving, ensuring that when the accelerator is pressed again to move forward, there won't be a severe lurching motion.