Some items need to be reset after the battery has been discharged or the battery has been disconnected. See chapter 3 for:
Hyundai Sonata LF 2014-2019 Owners Manual: 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 door lock button will be visible.
To lock a door, push the door lock button (1) to the "Lock" position. If
the door is locked properly, the red mark (2) on the door loc ...
Hyundai Sonata LF 2014-2019 Owners Manual: Smart Key
Your HYUNDAI uses a Smart Key, which you can use to lock or unlock a door (and
trunk) and even start the engine.
1. Door Lock
2. Door Unlock
3. Trunk Open
4. Panic
Locking
To lock :
1. Close all doors, engine hood and trunk.
2. Either press the door handle button or press the Door Lock button (1) ...