What is the function of the car's A button?

[Skylar]

Car's A button is the auto-hold function, which refers to an automatic braking feature that simplifies operation by avoiding the use of handbrake or electronic handbrake. The principle of auto-hold is that the car's ECU automatically measures wheel torque and vehicle level data to determine whether the vehicle has a tendency to roll. If there is a tendency to roll, the ECU will apply appropriate braking force to the wheels to keep the vehicle stationary. When starting, pressing the accelerator will automatically turn off the auto-hold, allowing the vehicle to move. The car's A button is a status button; when lit, it indicates that the auto-hold is activated, and when not lit, it means the auto-hold is turned off.