Lighting control
To operate the lights, turn the knob at the end of the control lever to one of the following positions:

1. OFF position
2. AUTO headlamp position (if equipped)
3. Parking lamp position
4. Headlamp position
Daytime running light (DRL)
The Daytime Running Lights (DRL) can make it easier for others to see the front of your vehicle during the day, especially after dawn and before sunset.
The DRL system will turn the dedicated lamp OFF when :

AUTO light position (if equipped)
The parking lamp and headlamp will be turned ON or OFF automatically depending on the amount of light outside the vehicle.
Even with the AUTO light feature in operation, it is recommended to manually turn ON the lamps when driving at night or in a fog, driving in the rain, or when you enter dark areas, such as tunnels and parking facilities.
NOTICE

Parking lamp position (
)
The parking lamp, license plate lamp and instrument panel lamp are turned ON.

Headlamp position (
)
The headlamp, parking lamp, license plate lamp and instrument panel lamp are turned ON.
Information
The ignition switch must be in the ON position to turn on the headlamp.
Light
High beam operationHyundai Elantra AD (2016-2020) Service Manual: Repair procedures
Adjustment
Glass Adjustment
•
Check the glass run channel for damage or deterioration, and replace them if necessary.
1.
Remove the rear door trim.
(Refer to Rear Door - "Rear Door Trim")
2.
Separate the mounting plug hole (A) from the rear door module.
...
Hyundai Elantra AD (2016-2020) Service Manual: Components and Components Location
Components
1. Intake camshaft2. Exhaust camshaft3. Intake CVVT assembly4. Exhaust CVVT assembly5. Timing chain6. Timing chain tensioner arm7. Timing chain tensioner8. Timing chain guide9. Timing chain cover10. Service plug bolt & gasket11. Front oil seal12. Crankshaft damper pulley13. Inter ...