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) Service Manual: Lift And Support Points
General Information
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When heavy rear components such as suspension, fuel tank,
spare tire, tailgate and trunk lid are to be removed, place additional
weight in the luggage area before hoisting. When substantial weight is
removed from the rear of the vehicle, the ...
Hyundai Elantra AD (2016-2020) Service Manual: Power Seat Control Switch Repair procedures
Inspection
Seat Control Switch
1.
With the power seat switch in each position, make sure that
continuity exists between the terminals below. If continuity is not as
specified, replace the power seat switch.
[Power Seat Control Switch]
Removal
1.
Disconnect the negative (-) battery ter ...