WARNING
Never adjust the instrument cluster while driving. This could result in loss of control and lead to an accident that may cause death, serious injury, or property damage.

The brightness of the instrument panel illumination changes by pressing the upper or lower part of the switch when the ignition switch is in the ON position and when the parking lights are turned on.

If the brightness reaches to the maximum or minimum level, a chime will sound (if equipped).
Instrument cluster
GaugesHyundai Creta GS 2014-2026 Service Manual: Components and components location
Components
1. Rear bumper cover
2. Rear bumper side bracket [LH]
3. Rear bumper side bracket [RH]
...
Hyundai Creta GS 2014-2026 Service Manual: Immobilizer Control Unit: Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad Lower Panel")
3.
Disconnect the connector of the immobilizer unit and ...