This warning light illuminates:
Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Components
1. Rear window glass2. Rear glass lower moulding
...
Hyundai Sonata LF 2014-2019 Owners Manual: How Vehicle Audio Works
AM and FM radio signals are broadcast from transmitter towers located around
your city. They are intercepted by the radio antenna on your vehicle. This signal
is then processed by the radio and sent to your vehicle speakers.
When a strong radio signal has reached your vehicle, the precise enginee ...