Hyundai sonata Owner's Manual page 79

Proper seated position for OCS
If the "PASSENGER AIR BAG OFF"
indicator is on when an adult is seated
in the front passenger seat, place the
Engine Start/Stop button in the OFF
position and ask the passenger to sit
properly (sitting upright with the seat
back in an upright position, centered
on the seat cushion with their seat belt
on, legs comfortably extended and their
feet on the floor). Restart the engine and
have the person remain in that position.
This will allow the system to detect the
person and to enable the passenger air
bag. If the "PASSENGER AIR BAG OFF"
indicator is still on, ask the passenger to
move to the rear seat.
WARNING
NEVER allow an adult passenger to ride
in the front passenger seat when the
"PASSENGER AIR BAG OFF" indicator
is illuminated. During a collision, the
air bag will not inflate if the indicator
is illuminated. Have your passenger
reposition themselves in the seat. If the
"PASSENGER AIR BAG OFF" indicator
remains illuminated after the passenger
repositions themselves properly
OHI038118
and the vehicle is restarted, have
the passenger move to the rear seat
because the air bag will not inflate.
NOTICE
The "PASSENGER AIR BAG OFF"
indicator illuminates for approximately
4 seconds after the Engine Start/
Stop button is in the ON position or
after the engine is started. If the front
passenger seat is occupied, the OCS will
then classify the front passenger after
several more seconds.
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