The sensors are located inside the rear bumper.
Always keep the rear bumper clean for proper operation of the system.
Hyundai Kona (OS) 2018-2022 Service Manual: Side Airbag (SAB) Module Repair procedures
Removal
•
The side airbag cannot be disassembled from the seat back assembly,
so replace the seat back assembly when replacing the side airbag.
...
Hyundai Kona (OS) 2018-2022 Service Manual: General information
General Troubleshooting
Information
Before Troubleshooting
1.
Check applicable fuses in the appropriate fuse/relay box.
2.
Check the battery for damage, state of charge, and clean and tight connections.
(Refer to Engine Ele ...