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.
Rear window defrosterKia Niro 2017 (DE HEV) Service Manual: Description and operation
Description
The HCU (Hybrid Control Unit) controls whole hybrid systems and is connected
with each control modules (ECM, TCM, MCU, BMS ECU etc.) by CAN interface. In addition
this system uses the brake switch signals for controlling the hybrid system.
& ...
Kia Niro (DE HEV) Owners Manual: Hazardous driving conditions
When hazardous driving conditions are encountered such as water, snow, ice, mud,
sand, or similar hazards, follow these suggestions:
Drive cautiously and allow extra distance for braking.
Avoid sudden braking or steering.
When braking with non-ABS brakes pump the brake pedal with a light u ...