Hyundai Sonata 2017 Owner's Manual page 171

Convenient features of your vehicle
Press brake pedal to start engine
• This warning message illuminates
if the Engine Start/Stop button
changes to the ACC position twice
by pressing the button repeatedly
without depressing the brake pedal.
• It means that you should depress
the brake pedal to start the engine.
3-86
Press START button with key
OLF044124L
• This warning message illuminates
if you press the Engine Start/Stop
button while the warning message
"Key not detected" is illuminating.
• At this time, the immobilizer indica-
tor light blinks.
Low Key Battery
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This warning message illuminates if
the battery of the smart key is dis-
charged when the Engine Start/Stop
button changes to the OFF position.
OLF044122L