
The Smart Cruise Control uses a sensor to detect distance to the vehicle ahead.
If the sensor is covered with dirt or other foreign matter, the vehicle to vehicle distance control may not operate correctly.
Always keep the sensor clean.
Warning message

Smart Cruise Control disabled. Radar blocked
When the sensor lens cover is blocked with dirt, snow, or debris, the Smart Cruise Control system operation may stop temporarily. If this occurs, a warning message will appear on the cluster LCD display. Remove any dirt, snow, or debris and clean the radar sensor lens cover before operating the Smart Cruise Control system. The Smart Cruise Control system may not properly activate, if the radar is totally contaminated, or if any substance is not detected after turning on the engine (e.g. in an open terrain).
Information
For the SCC operation is temporarily stopped if the radar is blocked, but you wish to use conventional cruise control mode (speed only control function), you must convert to the cruise control mode (refer to "To convert to Cruise Control mode" in the following page).
CAUTION

Check Smart Cruise Control System
The message will appear when the vehicle to vehicle distance control system is not functioning normally. Take your vehicle to an authorized HYUNDAI dealer and have the system checked.
Smart Cruise Control Vehicleto- Vehicle Distance
Adjusting the Sensitivity of Smart Cruise ControlHyundai Elantra AD (2016-2020) Owners Manual: Fuel Filler Door
Opening the fuel filler door
The fuel filler door must be opened from inside the vehicle by pulling up the
fuel filler door release lever.
1. Turn the engine off. Locate the fuel filler door release lever on the floor
on the left side of the driver seat.
2. Pull up on the release lever.
...
Hyundai Elantra AD (2016-2020) Service Manual: ESC Control Unit Repair procedures
Removal
1.
Turn the ignition switch OFF and then disconnect the negative (-) battery cable.
2.
Pull up the lock of the HECU connector (A) , then disconnect the connector.
3.
Remove the brake fluid from the master cylinder reservoir with a syringe.
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Be sure to ...