FCA produces warning messages, warning alarms, and emergency braking based on the level of risk of a frontal collision, such as when a vehicle ahead suddenly brakes, or when the system detects that a collision with a pedestrian is imminent.
Collision Warning (First warning)

This warning message appears on the LCD display with a warning chime. Additionally, some vehicle system intervention occurs by the engine management system to help decelerate the vehicle.
- Your vehicle speed may decelerate moderately.
- The FCA system limitedly controls the brakes to preemptively mitigate impact in
a collision.
- If you select "Warning Only", the FCA system activates and produces only warning
alarms in accordance with the collision risk levels.You should control the brake
directly because the FCA system do not control the brake.
Emergency Braking (Second warning)

This warning message appears on the LCD display with a warning chime.
Additionally, some vehicle system intervention occurs by the engine management system to help decelerate the vehicle.
- The FCA system limitedly controls the brakes to preemptively mitigate impact
in a collision. The brake control is maximized just before a collision.
- If you select "Warning Only", the FCA system activates and produces only warning
alarms in accordance with the collision risk levels.You should control the brake
directly because the FCA system do not control the brake.
Brake operation
CAUTION
WARNING
The FCA braking control cannot completely stop the vehicle nor avoid all collisions. The driver should hold the responsibility to safely drive and control the vehicle.
WARNING
The FCA system logic operates within certain parameters, such as the distance from the vehicle or pedestrian ahead, the speed of the vehicle ahead, and the driver's vehicle speed. Certain conditions such as inclement weather and road conditions may affect the operation of the FCA system.
WARNING
Never deliberately drive dangerously to activate the system.
System Setting and Activation
FCA Sensor (Front Radar/Front Camera)Hyundai Elantra AD (2016-2020) Service Manual: Side Impact Sensor (SIS) Description and Operation
Description
•
Side Impact Sensors (SIS), each installed on the center part
of the right and left front door modules and the right and left center
pillars, detects side impact during collision.
•
The SRSCM uses the signals from SIS during side collision to determine whether and w ...
Hyundai Elantra AD (2016-2020) Service Manual: Coolant Repair procedures
Refilling And Bleeding
•
Never remove the radiator cap when the engine is hot. Serious
scalding could be caused by hot fluid under high pressure escaping from
the radiator
•
When pouring engine coolant, be sure to shut the relay box
...