Kia SONET

From the 2024 Sonet's owner's manual:
"Rear passenger's seat belt warning

As a reminder to the rear passenger, the rear passenger's seat belt warning lights will appear for approximately 6 seconds each time you turn the ignition switch or ENGINE START/STOP button ON regardless of belt fastening.

If the seat belt is not fastened when the ignition switch or ENGINE START/STOP button is turned ON, the seat belt warning light will appear for approximately 70 seconds.

If you start to drive without the seat belt fastened or you unfasten the seat belt when you drive under 20 km/h (12 mph), the corresponding warning light will continue to appear for approximately 70 seconds.

You unfasten the seat belt when you drive over 20 km/h (12 mph), the seat belt warning chime will sound for approximately 35 seconds and the corresponding warning light will blink."