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.
Hyundai Elantra AD (2016-2020) Service Manual: Repair procedures
Operation and Leakage Check
Check all of the following items:
ComponentProcedureBrake Booster (A)Check brake operation by applying the brakes during a test
drive. If the brakes do not work properly, check the brake booster.
Replace the brake booster as an assembly if it does not work properl ...
Hyundai Elantra AD (2016-2020) Service Manual: Components and Components Location
Components
1. ESC Control Module(HECU)2. Front Wheel Speed Sensor3. Rear Wheel Speed Sensor4. ABS Warning lamp5. EBD / Parking brake warning lamp
...