Hyundai Sonata 2017 Owner's Manual page 315

Key ignition switch positions
Switch
Position
To turn the ignition switch to the LOCK position, turn the
key towards the LOCK position.
LOCK
The ignition key can be removed in the LOCK position.
Electrical accessories are usable.
ACC
This is the normal key position when the engine has
started.
ON All features and accessories are usable.
The warning lights can be checked when you turn the
ignition switch from ACC to ON.
To start the engine, turn the ignition switch to the START
START position. The switch returns to the ON position when you
let go of the key.
Action Notice
The steering wheel locks to protect the vehicle from theft.
(if equipped)
The steering wheel unlocks.
If difficulty is experienced turning the ignition switch to
the ACC position, turn the key while turning the steering
wheel right and left to release tension.
Do not leave the ignition switch in the ON position when
the engine is not running to prevent the battery from dis-
charging.
The engine will crank until you release the key.
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