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 2017 (DE HEV) Service Manual: Brake Pedal Repair procedures
Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad")
3.
Remove the knee air bag.
(Refer to Restrain ...
Kia Niro 2017 (DE HEV) Service Manual: Thermostat Repair procedures
Removal and Installation
Disassembly of the thermostat may have an adverse effect, causing deteriorated
cooling efficiency. Do not remove the thermostat, even if the engine tends
to overheat.
...