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 Service Manual: Repair procedures
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad")
3.
Remove the steering column upper & Lower shroud.
4.
Remove the ignition switch (A) and disconnecting the Key Warning / immobilizer connector.
5.
...
Hyundai Sonata LF 2014-2019 Service Manual: Water Temperature Control Assembly Repair procedures
Removal and Installation
1.
Loosen the drain plug, and drain the engine coolant. Remove the radiator cap to drain with speed.
2.
Disconnect the battery negative terminal.
3.
Remove the air cleaner assembly.
(Refer to Intake and exhaust system - "Air Cleaner")
4.
Disconnect the wate ...