Press the front blower OFF button to turn off the front air climate control system. However, you can still operate the mode and air intake buttons as long as the ignition switch is in the ON position.
Kia Niro 2017 (DE HEV) Service Manual: Relay Box (Engine Compartment) Components and components location
Component Location
E/R Junction Block
Circuit (E/R Junction Block)
PCB Block
Circuit (PCB Block)
...
Kia Niro 2017 (DE HEV) Service Manual: Muffler Components and components location
Components
1. Front muffler
2. Exhaust heat recovery system (EHRS)
3. Center muffler
4. Rear muffler
5. Gasket
6. Rubber hanger
...