Hyundai Elantra MD/UD: ON
with manual transaxle
Press the engine start/stop button when the button is in the ACC position without depressing the clutch pedal.
with automatic transaxle
Press the engine start/stop button when the button is in the ACC position without depressing the brake pedal.
The warning lights can be checked before the engine is started. Do not leave the button in the ON position if the engine is not running to prevent the battery from discharging.