Seat Belt Reminder Light

Driver and Front Passenger Seat Belt Warning
The seat belt reminder light will illuminate and a warning chime will sound for approximately 6 seconds each time the engine start/stop button is in the ON or START position, regardless of seat belt status. During this time, if the seat belt is not fastened, the warning chime will sound for 6 seconds.
If the seat belt is not fastened when the engine start/stop button is in the ON or START position, or if it is unfastened after pressing the engine start/stop button to the ON or START position, the seat belt reminder light will remain illuminated until the seat belt is fastened.
If you start driving without fastening the seat belt, or unfasten the seat belt while driving below 20 km/h, the indicator light will remain illuminated until you fasten the seat belt.
If you continue driving without fastening the seat belt, or unfasten the seat belt while driving above 20 km/h, the unfastened seat belt warning chime will sound for approximately 100 seconds and the warning indicator light will flash.
Test yourself
A quick Hyundai Elantra CN7 quiz: every answer comes with an explanation and a link to the manual page.