The vehicle's front and rear seats have adjustable head restraints. The head restraints provide comfort for passengers, but more importantly they are designed to help protect passengers from whiplash and other neck and spinal injuries during an accident, especially in a rear impact collision.
WARNING
To reduce the risk of serious injury or death in an accident, take the following precautions when adjusting your head restraints:

NOTICE
To prevent damage, NEVER hit or pull on the head restraints.
Armrest
Front seat head restraintsHyundai Elantra AD (2016-2020) Service Manual: Description and Operation
Description
The immobilizer system will disable the vehicle unless the
proper ignition key is used, in addition to the currently available
anti-theft systems such as car alarms, the immobilizer system aims to
drastically reduce the rate of auto theft.
1.
Transponder (TP) – IMMO ECU Comm ...
Hyundai Elantra AD (2016-2020) Service Manual: Front Seat Frame Assembly Repair procedures
Replacement
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Put on gloves to prevent hand injuries.
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When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components.
•
Use a plastic panel removal tool to remove int ...