For proper maintenance, safety, and maximum fuel economy, you must always maintain recommended tire inflation pressures and stay within the load limits and weight distribution recommended for your vehicle.

All specifications (sizes and pressures) can be found on a label attached to the driver's side center pillar.
Tires and Wheels
Recommended Cold Tire Inflation PressuresHyundai Elantra AD (2016-2020) Owners Manual: Bright-metal maintenance, Underbody maintenance
Bright-metal maintenance
To remove road tar and insects, use a tar remover, not a scraper or other
sharp object.
To protect the surfaces of brightmetal parts from corrosion, apply a coating
of wax or chrome preservative and rub to a high luster.
During winter weather or in coastal area ...
Hyundai Elantra AD (2016-2020) Service Manual: Schematic Diagrams
Schematic Diagrams
Terminal Function
TypePin NoDescriptionBattery1Battery +2Battery -VSS1IGN2-3-4-5-6-7HIGH CAN8LOW CAN
...