Pressing the button of the front outside door handles with all doors (and tailgate) closed and any door unlocked, locks all the doors (and tailgate). The hazard warning lights will blink once to indicate that all doors (and tailgate) are locked. The button will only operate when the smart key is within 0.7 ~ 1m (28 ~ 39.3 in) from the outside door handle. If you want to make sure that a door has locked or not, you should check the door lock button inside the vehicle or pull the outside door handle.
Even though you press the button, the doors will not lock and the chime sounds if any of the following occurs:
Kia Niro 2017 (DE HEV) Service Manual: Specifications
Specifications
Front Suspension
Item
Specification
Suspension type
Macpherson Strut
Shock absorber
Type
GAS
Rear Suspension
Item
Specification
...
Kia Niro 2017 (DE HEV) Service Manual: Pre-Charge Relay Specifications
Specification
Item
Specification
Contact
Rated Voltage (V)
450
Rated Current (A)
10
Coil
Operating Voltage (V)
12
Resistance (Ω) ...