Hyundai Sonata: Smart Key / Battery replacement
If the Smart 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 smart key.
2. Remove the old battery and insert the new battery.
3. Reinstall the rear cover of the smart key.
If you suspect your smart key might have sustained some damage, or you feel your smart 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(s).
Smart key precautions
The smart key will not work if any of the following occur:
The smart key is close to a radio transmitter such as a radio station or
an airport which can interfere with normal operation of the tran ...
Immobilizer System
The immobilizer system protects your vehicle from theft. If an improperly coded
key (or other device) is used, the engine's fuel system is disabled.
When the ignition switch is placed in the ON posit ...
Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Front Seat Assembly Repair procedures
Replacement
•
When folding the seatback forward in state that headrest and
seat is upper and seat is moved forward, be careful not to touch the
components such as sunvisor.
1.
Remove the front anchor seat belt.
(Refer to Restraint - "EFD (Emergency Fastening ...
Hyundai Sonata LF 2014-2019 Owners Manual: To decrease the Smart Cruise Control set speed
Follow either of these procedures:
Push the toggle switch down (SET-), and hold it. Your vehicle set speed
will decrease by 5 mph (10 km/h). Release the toggle switch at the speed you
want.
Push the toggle switch down (SET-), and release it immediately. The cruising
speed will decrease by ...
