If the LED lamp does not operate, have the vehicle checked by an authorized HYUNDAI dealer.
Hyundai Sonata LF 2014-2019 Service Manual: Rear Seat Folding Lever Components and Components Location
Components
1. Rear seat folding lever
...
Hyundai Sonata LF 2014-2019 Service Manual: Multimedia Jack Description and Operation
Description
The multimedia jack on the console upper cover is for
customers who like to listen to external portable music players like the
MP3 etc., through the vehicle's sound system when it is linked to this
jack. The customer has this added option.
In case of distortions from media conn ...