Turn Signal Indicator Light

This indicator light blinks:
When you operate the turn signal indicator.
If any of the following occurs, there may be a malfunction with the turn signal system.
- The turn signal indicator light illuminates but does not blink
- The turn signal indicator light blinks rapidly
- The turn signal indicator light does not illuminate at all
If either of these conditions occur, have your vehicle inspected by an authorized HYUNDAI dealer.
High Beam Indicator Light

This indicator light illuminates:
Light ON Indicator Light

This indicator light illuminates:
When the tail lights or headlights are on.
Immobilizer Indicator Light
High Beam Assist (HBA) indicator light, Cruise Indicator LightHyundai Elantra AD (2016-2020) Service Manual: Drive Belt Tensioner Repair procedures
Removal and Installation
1.
Disconnect the drive belt.
(Refer to Timing System - "Drive Belt")
2.
Remove the drive belt tensioner (A).
Tightening torque :
center bolt : 29.4 ~ 41.2 N.m (3.0 ~ 4.2 kgf.m, 21.7 ~ 30.4 lb-ft)
fxing bolt : 39.2 ~ 49.0 N.m (4.0 ~ 5.0 kgf.m, 28.9 ~ 36.2 lb-ft ...
Hyundai Elantra AD (2016-2020) Owners Manual: Detecting Sensor. Warning message
The rear radars are located inside the rear bumper for detecting the side and
rear areas. Always keep the rear bumper clean for proper operation of the system.
NOTICE
The system may not work properly when the bumper has been damaged, or
if the rear bumper has been replaced or repaired.
...