This indicator light illuminates:
When you select "SPORT" mode as drive mode.
Hyundai Sonata LF 2014-2019 Service Manual: Mode Control Actuator Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the mode control actuator connector.
3.
Verify that the mode control actuator operates to the defrost mode when connecting 12V to terminal 3 and grounding terminal 4.
Verify that the mode control actuator operates to the vent mod ...
Hyundai Sonata LF 2014-2019 Service Manual: Special Service Tools
Special Service Tools
Tool (Number and name)IllustrationUse09880-4F000Hog ring clip installerHog ring clip installation
...