Adjusting instrument cluster illumination

When the vehicle's parking lights or headlights are on, press the illumination control button to adjust the brightness of the instrument panel illumination.
When pressing the illumination control button, the interior switch illumination intensity is also adjusted.
WARNING
Never adjust the instrument cluster while driving. Doing so could lead to driver distraction which may cause an accident and lead to vehicle damage, serious injury, or death.

Instrument Cluster
GaugesHyundai Elantra AD (2016-2020) Service Manual: Radiator Repair procedures
Inspection
Radiator Cap Testing
1.
Remove the radiator cap, wet its seal with engine coolant, and then install it on a pressure tester.
2.
Apply a pressure of 93.16 ~ 122.58 kPa (0.95 ~ 1.25 kgf/cm?, 13.51 ~ 17.78 psi).
3.
Check for a drop in pressure.
4.
If the pressure drops, re ...
Hyundai Elantra AD (2016-2020) Owners Manual: Power Windows
The ignition switch must be in the ON position to be able to raise or lower the
windows. Each door has a Power Window switch to control that door's window. The
driver has a Power Window Lock switch which can block the operation of passenger
windows. The power windows will operate for appro ...