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.
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 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 SensorHyundai Elantra AD (2016-2020) Service Manual: Fuel Sensor Repair procedures
Removal
1.
Remove the fuel pump.
(Refer to Fuel Delivery System - "Fuel Pump")
2.
Disconnect the fuel sender connector (A).
3.
Remove the fuel sender (A) in the direction of an arrow.
Installation
1.
Installation is reverse of removal. ...
Hyundai Elantra AD (2016-2020) Service Manual: Rear Disc Brake Components and Components Location
Components
1. Brake pad2. Pad return spring3. Caliper carrier4. Pad retainer5. Caliper body6. Return spring7. Stopper8. Operating lever9. Bleed screw
...