What is the function of the AOFF button in a car?

[McGarrett]

The AOFF button in a car is used to deactivate the auto start-stop function, serving as the disable button for the vehicle's start-stop system. When the button's indicator light is on, the start-stop function is turned off; pressing the button to turn off the indicator light enables the use of the start-stop function. The illumination of the AOFF light indicates that the vehicle's engine auto start-stop function is activated. This feature effectively protects the engine from damage and helps reduce fuel consumption. Under normal circumstances, the AOFF function can remain enabled. However, when the vehicle is driving through deep water, the AOFF function should be turned off to prevent engine damage. This is because with the AOFF function activated, the vehicle automatically shuts off the engine when the brake is pressed. If water enters the engine while the vehicle is off, releasing the brake will cause the vehicle to automatically restart, potentially leading to engine damage.