If the remote key is not working properly, try replacing the battery with a new one.
Battery Type: CR2032
To replace the battery:
1. Pry open the rear cover of the remote key.
2. Remove the old battery and insert the new battery. Make sure the battery position is correct.
3. Reinstall the rear cover of the remote key.
If you suspect your remote key might have sustained some damage, or you feel your remote key is not working correctly contact an authorized HYUNDAI dealer.
Information
An inappropriately disposed battery can be harmful to the environment and human health. Dispose the battery according to your local law(s) and regulation.
Hyundai Sonata LF 2014-2019 Owners Manual: Cruise Control will be canceled when
Depressing the brake pedal.
Pressing the CANCEL switch located on the steering wheel.
Pushing the CRUISE button. Both the CRUISE indicator and the SET indicator
will turn OFF.
Moving the shift toggle switch into N (Neutral).
Decreasing the vehicle speed lower than the memory speed by 5 mph ...
Hyundai Sonata LF 2014-2019 Service Manual: Condenser Components and Components Location
Components Location
[Theta 2.4 GDI]
1. Condenser
[Gamma 1.6 T-GDI / Theta 2.0 T-GDI]
1. Condenser
...