WARNING
Do not use the interior lights when driving in the dark. The interior lights may obscure your view and cause an accident.
NOTICE
Do not use the interior lights for extended periods when the engine is turned off or the battery will discharge.
Interior lamp AUTO cut
The interior lamps will automatically go off approximately 20 minutes after the engine is turned off and the doors are closed. If a door is opened, the lamp will go off 40 minutes after the engine is turned off. If the doors are locked by the remote key or smart key and the vehicle enters the armed stage of the theft alarm system, the lamps will go off five seconds later.
Hyundai Elantra AD (2016-2020) Service Manual: Air Cleaner Repair procedures
Removal and Installation
Air Cleaner Assembly
1.
Remove the engine cover.
(Refer to Engine And Transaxle Assembly - “Engine Cover”)
2.
Disconnect the battery negative terminal.
3.
Remove the air duct (A).
4.
Disconnect the breather hose (A).
5.
Disconnect the intake hose ...
Hyundai Elantra AD (2016-2020) Owners Manual: Care of Seat Belts
Seat belt systems should never be disassembled or modified. In addition, care
should be taken to assure that seat belts and belt hardware are not damaged by seat
hinges, doors or other abuse.
Periodic inspection
All seat belts should be inspected periodically for wear or damage of any kind.
...