The temperature will increase by turning the knob to the right.
The temperature will decrease by turning the knob to the left.
Hyundai Sonata LF 2014-2019 Service Manual: Blind Spot Detection Unit Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the rear bumper.
(Refer to Body - "Rear Bumper")
3.
Remove the BSD unit (A) after loosening the mounting nuts.
Take care not to separate the bracket from rear bumper when removing the BSD sensor.
...
Hyundai Sonata LF 2014-2019 Service Manual: Inhibitor Switch Repair procedures
Inspection
•
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Inspection flow
Items to check
1.
Inspect DTC code.
2.
Inspect whether N setting matches.
A.
Adjust N setting (refer to ...