The battery sensor is deactivated, when the battery is disconnected from the negative pole for maintenance purpose.
In this case, the ISG system is limitedly operated due to the battery sensor deactivation. Thus, the driver needs to take the following procedures to reactivate the battery sensor after disconnecting the battery.
Hyundai Kona (OS) 2018-2025 Service Manual: Description and operation
Description
The SMART KEY system is a system that allows the user to access and operate
a vehicle in a very convenient way. To access the vehicle, no traditional key
or remote control unit is needed.
The user carries a SMART KEY FOB which does not require any conscious acti ...
Hyundai Kona (OS) 2018-2025 Service Manual: Repair procedures
Inspection
Check it by the procedure below to see if the function of the ECM is normal.
1.
Turn the ignition key to the "ON" position.
2.
Cover the forward facing sensor.
3.
...