Even though your vehicle is equipped with the OCS, never install a child restraint in the front passenger's seat. An inflating air bag can forcefully strike a child or child restraint resulting in serious or fatal injury.
WARNING
Hyundai Elantra AD (2016-2020) Owners Manual: Instrument Cluster Control
Adjusting instrument cluster illumination
When the vehicle's parking lights or headlights are on, press the illumination
control button to adjust the brightness of the instrument panel illumination.
When pressing the illumination control button, the interior switch illumination
intensity ...
Hyundai Elantra AD (2016-2020) Service Manual: Front Seat Belt Buckle Repair procedures
Replacement
1.
Remove the front seat assembly.
(Refer to Front Seat - "Front Seat Assembly")
2.
Disconnect the front seat belt buckle connector wiring (A).
3.
After loosening the mounting bolt, remove the front seat belt buckle (A).
Tightening torque :
39.2 ~ 53.9 N.m (4.0 ~ 5.5 kgf ...