See also:

Operating door locks from inside the vehicle
With the door lock button • To unlock a door, push the door lock button (1) to the “Unlock” position. The red mark (2) on the button will be visible. • To lock a door, push the door lock button ...

Steering Gear Box, Linkage & Boots/Lower Arm Ball Joint
With the vehicle stopped and engine off, check for excessive free-play in the steering wheel. Check the linkage for bends or damage. Check the dust boots and ball joints for deterioration, cracks, ...

SAFETY
The Elantra has two sets of lower Latch anchors in the second row's outboard seats. While they're buried in the seat cushions, they're not impossible to reach. My younger son, who uses a booster ...