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) Owners Manual: Smart key
To lock the doors, press the button on the outside door handle while carrying
the Smart Key with you or press the Door Lock button on the Smart Key.
Press the button on the driver's outside door handle while carrying the Smart
Key with you or press the Door Unlock button on the Smart Ke ...
Hyundai Elantra AD (2016-2020) Service Manual: Crankshaft Position Sensor (CKPS) Description and Operation
Description
Crankshaft Position Sensor (CKPS) detects the crankshaft
position and is one of the most important sensors of the engine control
system. If there is no CKPS signal input, the engine may stop because of
CKPS signal missing. This sensor is installed on the cylinder block or
the ...