Hyundai GENESISDH Owner's Manual page 284

Driving your vehicle
Button Position
ON
Press the Engine Start/Stop button while it is
in the ACC position without depressing the
brake pedal.
The warning lights can be checked before
the engine is started.
START
To start the engine, depress the brake pedal
and press the Engine Start/Stop button with
the shift lever in the P (Park) or in the N
(Neutral) position.
For your safety, start the engine with the shift
lever in the P (Park) position.
5-8
Action Notice
Do not leave the Engine Start/Stop button in
the ON position when the engine is not run-
ning to prevent the battery from discharging.
If you press the Engine Start/Stop button with-
out depressing the brake pedal, the engine
does not start and the Engine Start/Stop but-
ton changes as follows:
OFF → ACC → ON → OFF
However, the engine may start if you depress
the brake pedal within 0.5 second after press-
ing the Engine Start/Stop button when it is in
the OFF position.