Remote Key

Your HYUNDAI uses a smart key, which allows you to lock or unlock the doors (and trunk) and even start the engine.
1. Door Lock
2. Door Unlock
3. Trunk Opening
4. Panic
Locking
To lock:
1. Close all doors, the hood and the trunk.
2. Press the door lock button (1) on the smart key.
3. The hazard warning lights will flash and the horn will sound once if the lock button is pressed again within four seconds.
4. Make sure the doors are locked by checking the position of the door lock button inside the vehicle.
Information
After locking the doors, if you press the door lock button again within four seconds, the hazard lights will flash and the horn will sound once to confirm that the doors are locked.
WARNING
Do not leave the keys in the vehicle with children unattended. Unattended children may insert the key into the ignition switch and operate the power windows or other controls, or even set the vehicle in motion, which may result in serious injury or death.
Unlocking
To unlock:
1. Press the door unlock button (2) on the smart key.
2. The driver's door will unlock. The hazard warning lights will flash twice.
If you press the door unlock button again within four seconds, all doors will unlock.
Information
After unlocking the doors, the doors will automatically lock again after 30 seconds if no door is opened.
Opening the Trunk
To open:
1. Press and hold the tailgate unlock button (3) on the remote key for more than one second.
2. The hazard warning lights will flash twice.
Once the trunk is opened and then closed, the trunk automatically locks.
Information
The word "HOLD" is printed on the button to indicate that you must press and hold the button for more than one second.
Panic button
Press the panic button (4) for more than one second. The horn and hazard warning lights will flash for approximately 30 seconds.
To cancel the panic mode, press any button on the remote key.
NOTICE
To avoid damaging the remote key:
- Keep the remote key away from water or any other liquids and fire. If the inside of the remote key becomes wet (from drinks or moisture) or overheats, the internal circuit may malfunction, and the vehicle may be excluded from warranty coverage.
- Do not drop or throw the smart key.
- Protect the remote key from extreme temperatures.
Test yourself
A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.