Driver's and passenger's front air bags
Your vehicle is equipped with a Advanced Supplemental Restraint System (SRS) and lap/shoulder belts at both the driver and passenger seating positions.
The SRS consists of air bags which are located in the center of the steering wheel, in the driver's side lower crash pad below the steering wheel column and the passenger's side front panel pad above the glove box.
The air bags are labeled with the letters "AIR BAG" embossed on the pad covers.

â– Driver's front air bag

â– Driver's knee air bag

â– Passenger's front air bag
The purpose of the SRS is to provide the vehicle's driver and front passengers with additional protection than that offered by the seat belt system alone. The SRS uses sensors to gather information about the driver's and front passenger's seat belt usage and impact severity.
The seat belt buckle sensors determine if the driver and front passenger's seat belts are fastened. These sensors provide the ability to control the SRS deployment based on whether or not the seat belts are fastened, and how severe the impact is.
The advanced SRS offers the ability to control the air bag inflation within two levels. A first stage level is provided for moderate-severity impacts. A second stage level is provided for more severe impacts.
According to the impact severity, and seat belt usage, the SRS Control Module (SRSCM) controls the air bag inflation. Failure to properly wear seat belts can increase the risk or severity of injury in an accident.
WARNING
To reduce the risk of serious injury or death from an inflating front air bags, take the following precautions:
Air Bag - Advanced Supplemental Restraint System
Side air bagsHyundai Elantra AD (2016-2020) Owners Manual: Seatback pocket
The seatback pocket is provided on the back of the front passenger's seatback.
WARNING
To prevent the Occupant Classification System from malfunctioning:
Do not hang onto the front passenger's seatback.
CAUTION
Do not put heavy or sharp objects in the seatback pockets. In an accident ...
Hyundai Elantra AD (2016-2020) Owners Manual: Disc Brakes Wear Indicator, Rear Drum Brakes
Disc Brakes Wear Indicator
When your brake pads are worn and new pads are required, you will hear a high
pitched warning sound from your front or rear brakes. You may hear this sound come
and go or it may occur whenever you depress the brake pedal.
Note that some driving conditions or climates ...