With a smart key, you can lock or unlock a door (and tailgate) and even start the engine without inserting the key.
The functions of the buttons on a smart key are similar to the remote keyless entry. (Refer to the “Remote keyless entry” in this chapter.)
Carrying the smart key, you may lock and unlock the vehicle doors (and tailgate). Also, you may start the engine. Refer to the following, for more details.
Kia Niro (DE HEV) Owners Manual: Battery saver function
The purpose of this feature is to prevent the battery from being discharged.
The system automatically turns off the parking lights when the driver removes
the ignition key and opens the driver-side door.
With this feature, the parking lights will turn off automatically if the
driver pa ...
Kia Niro 2017 (DE HEV) Service Manual: Rear Coil Spring Repair procedures
Removal
1.
Disconnect the battery negative cable.
2.
Remove the wheel and tire.
Tightening torque:
107.9 - 127.5 N·m (11.0 - 13.0 kgf·m, 79.6 - 94.0 lb·ft)
...