The purpose of the air bag warning light in your instrument panel is to alert you of a potential problem with your air bag - Supplemental Restraint System (SRS).
When the ignition switch is turned ON, the warning light should illuminate for approximately 6 seconds, then go off.
Have the system checked if:
Kia Niro 2017 (DE HEV) Service Manual: Rear Seat Belt Buckle Components and components location
Component Location
1. Rear seat belt buckle [RH]
2. Rear seat belt buckle [LH]
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Kia Niro 2017 (DE HEV) Service Manual: Rear Transverse Trim Repair procedures
Replacement
Put on gloves to protect your hands.
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Use a plastic panel removal tool to remove interior trim pie ...