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When the ignition switch is in the ON position or when the engine is running, press the heated steering wheel button to warm the steering wheel. The indicator on the button will illuminate.
To turn the heated steering wheel off, press the button again. The indicator on the button will turn off.
The heated steering wheel will automatically turn off after approximately 30 minutes.
NOTICE
Do not install any cover or accessory on the steering wheel. The cover or accessory could cause damage to the heated steering wheel system.
 Tilt Steering / Telescope Steering
Tilt Steering / Telescope Steering Horn
HornHyundai Sonata LF 2014-2019 Service Manual: Temperature Control Actuator Description and Operation
   Description
The temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows. 
The signal from the control unit adjusts the position of the 
temperature door by operating the temperature switch. Then the 
temperature will be regulated by  ...
   
Hyundai Sonata LF 2014-2019 Service Manual: Canister Close Valve (CCV) Repair procedures
   Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the CCV connector.
3.
Measure resistance between the CCV terminal 1 and 2.
4.
Check that the resistance is within the specification.
Specification: Refer to "Specification"
5.
Disconnect the vapor hose connected with  ...