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 Cee'd JD Service Manual: Rear Center Seat Belt Retractor Components and components location
Component Location
1. Rear center seat belt retractor
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Kia Cee'd JD Service Manual: Cylinder Head Components and components location
Components
1. Cylinder head assembly
2. MLA
3. Retainer lock
4. Retainer
5. Valve stem seal
6. Valve spring
7. Valve spring seat
8. OCV (Oil Control Valve)
9. Exhaust valve
10. Intake valve
11. Cylinder head gasket
...