The instrument panel illumination intensity can be adjusted as follows:
The illumination intensity is shown on the instrument cluster LCD display.
Kia Cee'd JD Service Manual: Side Impact Sensor (SIS) Repair procedures
Removal
Side Impact Sensor
1.
Disconnect the battery negative cable and wait for at least three minutes
before beginning work.
2.
Remove the door scuff trim.
(Refer to Body - "Door scuff trim")
...
Kia Cee'd JD Service Manual: Alternator Description and operation
Description
The Alternator has eight built-in diodes, each rectifying AC current to DC current.
Therefore, DC current appears at alternator "B" terminal.
In addition, the charging voltage of this alternator is regulated by the battery
voltage detection system. ...