This indicator light illuminates when the headlights are on.
Kia Cee'd JD Service Manual: Head Lamps Repair procedures
Inspection
1.
Check-points upon head lamp failure (HID)
(1)
Check the battery voltage. (Low beam will be on when the battery
voltage above 9V.)
(2)
Check the fuse and relay.
...
Kia Cee'd JD 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 defog mode when
connecting 12V to terminal 3 and ...