Icy Road Warning Light

This warning light is to warn the driver the road may be icy.
When the temperature on the outside temperature gauge is approximately below 40°F (4°C), the Icy Road Warning Light and Outside Temperature Gauge blinks and then illuminates. Also, the warning chime sounds 1 time.
You can activate or deactivate Icy Road Warning function from the User Settings mode in the cluster LCD display (if equipped with supervision cluster).
Information
If the icy road warning light appears while driving, you should drive more attentively and safely refraining from over-speeding, rapid acceleration, sudden braking or sharp turning, etc.
Electronic Stability Control (ESC) Indicator Light

This indicator light illuminates:
This indicator light blinks:
While the ESC is operating.
For more details, refer to "Electronic Stability Control (ESC)" in chapter 5.
Master, Door Ajar, Trunk Open, Hood Open Warning Lights Light
Electronic Stability Control (ESC) OFF Indicator LightHyundai Elantra AD (2016-2020) Service Manual: 26 Brake Control Solenoid Valve(26/B_VFS) Description and Operation
Description
•
26 brake control solenoid valve(26/B_VFS) is attached to the valve body.
•
This variable force solenoid valve directly controls the hydraulic pressure inside the 26Brake.
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Hyundai Elantra AD (2016-2020) Service Manual: Refrigerant Line Repair procedures
Replacement
1.
If the compressor is marginally operable, run the engine at
idle speed, and let the air conditioning work for a few minutes, then
shut the engine off.
2.
Disconnect the negative (-) battery terminal.
3.
Recover the refrigerant with a recovery / charging station.
...