If your vehicle is equipped with the outside rearview mirror defrosters, they will operate at the same time you turn on the rear window defroster.
Kia Niro 2017 (DE HEV) Service Manual: Front Seat Frame Assembly Components and components location
Component Location
1. Front seat back frame assembly
2. Front seat cushion frame assembly
...
Kia Niro 2017 (DE HEV) Service Manual: Catalytic Converter Description and operation
Description
The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes
carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen
(NOx).
Catalytic Converter
(WCC)
Catalytic Converter
(UCC)
...