Key not in vehicle (for smart key system)
This warning message illuminates if the smart key is not in the vehicle
when you press the Engine Start/Stop Button.
It means that you should always have the smart key with you.
...
Smart key function
To remove the mechanical key, press and hold the release button(1) and remove
the mechanical key (2).
To reinstall the mechanical key, put the key into the hole and push it until
a click sound ...