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: SRS Control Module (SRSCM) Repair procedures
Removal
1.
Remove the battery (-) cable.
Disconnect the battery negative terminal and wait for at least
thirty seconds before beginning work.
...
Kia Niro 2017 (DE HEV) Service Manual: High voltage shut-off procedures
High Voltage Shut-off Procedures
•
Be sure to read and follow the “General Safety Information and
Caution” before doing any work related with the high voltage system.
Failure t ...