Air bags are not designed to inflate in every collision. There are certain types of accidents in which the air bag would not be expected to provide additional protection. These include rear impacts, second or third collisions in multiple impact accidents, as well as low speed impacts. Damage to the vehicle indicates a collision energy absorption, and is not an indicator of whether or not an air bag should have inflated.
Hyundai Sonata LF 2014-2019 Service Manual: Knock Sensor (KS) Specifications
Specification
ItemSpecificationResistance(M?)4.87
...
Hyundai Sonata LF 2014-2019 Service Manual: Front Seat Belt Retractor Repair procedures
Replacement
•
When installing the belt, make sure not to damage the retractor.
1.
Remove the center pillar lower trim.
(Refer to Interior Trim - "Center Pillar Trim")
2.
Remove the center pillar upper trim.
(Refer to Interior Trim - "Center Pillar Trim")
...