This warning light informs the driver that the seat belt is not fastened.
Hyundai Sonata LF 2014-2019 Service Manual: AVN Keyboard Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Using a screwdriver or remover, separate the center fascia panel (A).
3.
Remove the center fascia panel (A) after disconnect the connector.
4.
Remove the AVN keyboard unit (A) after loosening the screws.
Installation
1.
...
Hyundai Sonata LF 2014-2019 Service Manual: Fuel Pump Control Module (FPCM) Schematic Diagrams
Circuit Diagram
Fuel Pressure Control Module (FPCM) Terminal And Input/Output signal
FPCM Terminal Function
Pin No.DescriptionConnected to1Fuel sender ground Fuel Pump 2Fuel pressure sensor (FPS) signal input Fuel Pressure Sensor (FPS) 3CAN [High] ?ECM 4Fuel pressure sensor (FPS) power supply ( ...