Push the A/C button to manually turn the system on (indicator light will illuminate) and off.
Hyundai Sonata LF 2014-2019 Service Manual: Battery Repair procedures
Removal
1.
Remove the air duct.
(Refer to Engine Mechanical System - "Air Cleaner")
2.
Disconnect the battery (-)terminal (A) and then (+)terminal (B).
3.
Remove the TCM.
(Refer to Automatic Transaxle System - "Transaxle Control Module (TCM)")
4.
Remove the battery mounting bracket ...
Hyundai Sonata LF 2014-2019 Service Manual: Driver Airbag (DAB) Module and Clock Spring Components and Components Location
Components
1. Driver airbag (DAB)2. Steering wheel3. Clock spring
...