This warning light illuminates :
Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Component Location
1. DDM (Driver Door Module)2. ADM (Assistant Door Module)3. RRDM / RLDM (Rear Door Module)4. Front window motor5. Rear window motor
...
Hyundai Sonata LF 2014-2019 Owners Manual: Ignition Switch
WARNING
To reduce the risk of SERIOUS INJURY or DEATH, take the following precautions:
NEVER allow children or any person who is unfamiliar with the vehicle
to touch the ignition switch or related parts. Unexpected and sudden vehicle
movement can occur.
NEVER reach through the steering wheel ...