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 2014-2019 Service Manual: Components and components location
Components Location(1)
1. Automatic transaxle
2. Output speed sensor
3. Input speed sensor
4. Solenoid valve connector
5. Oil temperature sensor
6. Solenoid valve mounting bracket
7. Valve body cover
8. Valve body assembly
9. Inhibitor switch ...
Hyundai Creta GS 2014-2019 Service Manual: Rear Combination Lamp: Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Loose the screws (2EA) holding the rear combination lamp then disconnect
the connector (A) then remove the outside rear combination lamp (B).
...