Always come to a complete stop and continue to depress the brake pedal. Move the shift lever into the P (Park) position, apply the parking brake, and place the ignition switch in the LOCK/OFF position. Take the Key with you when exiting the vehicle.
WARNING
Shift-lock system & release
Good Driving PracticesHyundai Elantra AD (2016-2020) Owners Manual: System Maintenance
   Climate control air filter
This filter is installed behind the glove box. It filters the dust or other pollutants 
that enter the vehicle through the heating and air conditioning system.
Have the climate control air filter replaced by an authorized HYUNDAI dealer 
according to the maintenance  ...
   
Hyundai Elantra AD (2016-2020) Service Manual: SRS Control Module (SRSCM) Repair procedures
   Removal
1.
Remove the ignition key from the vehicle.
2.
Disconnect the battery negative cable and wait for at least three minutes before beginning work.
3.
Remove the floor console.
(Refer to Body - "Floor Console Assembly")
4.
Remove the center console duct (A) after loosening the  ...