A seat belt should be used when an injured person is being transported. When this is necessary, you should consult a physician for recommendations.
Kia Cee'd JD Service Manual: Side Impact Sensor (SIS) Repair procedures
Removal
Side Impact Sensor
1.
Disconnect the battery negative cable and wait for at least three minutes
before beginning work.
2.
Remove the door scuff trim.
(Refer to Body - "Door scuff trim")
...
Kia Cee'd JD Service Manual: ICM (Integrated Circuit Module) Relay Box Repair procedures
Inspection
1.
The ICM (Integrated Circuit Module) can be diagnosed by using the GDS
more quickly.
The BCM communicates with the GDS and then reads the relay value and
drives the actuator.
2.
To diagnose the ICM relay ...