

Curtain air bags are located along both sides of the roof rails above the front and rear doors.
They are designed to help protect the heads of the front seat occupants and the rear outboard seat occupants in certain side impact collisions.
The curtain air bags are designed to deploy during certain side impact collisions, depending on the crash severity.
The side and curtain air bags on both sides of the vehicle may deploy if a rollover or possible rollover is detected.
The curtain air bags are not designed to deploy in all side impact or rollover situations.
WARNING
To reduce the risk of serious injury or death from an inflating curtain air bags, take the following precautions:
Side air bags
How Does the Air Bag System Operate?Hyundai Elantra AD (2016-2020) Service Manual: ABS Control Module Components and Components Location
Components
1. Front - right tube2. Rear - left tube3. Rear - right tube4. Front - left tube5. MC SEC 6. MC PRI7. ABS control module(HECU)8. Bracket
...
Hyundai Elantra AD (2016-2020) Service Manual: Schematic Diagrams
Schematic Diagram
Canister
The Canister is filled with charcoal and absorbs evaporated
fuel vapor from the fuel tank. The gathered fuel vapor in canister is
drawn into the intake manifold by the ECM/PCM when appropriate
conditions are set.
Purge Control Solenoid Valve (PCSV)
The Purge ...