Warning Condition

WARNING: This page is about a different car, the 2017 Genesis G90. However, it is still accessible from the selected car via links, so may be relevant.

Warning zone

Fig 1: Lane Change Assist Warning Zone Dimension
Courtesy of HYUNDAI MOTOR AMERICA
Conditions for BSD warning ON
1. The entire body of the target vehicle is located behind the line A.
2. Some part of the target vehicle passes the line B.
3. Some part of the target vehicle passes the line D and Hysteresis In.
4. The entire part of the target vehicle passes the line E and Hysteresis In.
  
  Fig 2: Lane Change Assist Warning Zone - Conditions For BSD Warning ON
  Courtesy of HYUNDAI MOTOR AMERICA
Conditions for BSD warning OFF
1. The entire body of the target vehicle moves behind the line B.
2. The entire body of the target vehicle moves before the line A.
3. The entire body of the target vehicle passes the line D and Hysteresis Out.
4. The entire part of the target vehicle passes the line E and Hysteresis Out.
  
  Fig 3: Lane Change Assist Warning Zone - Conditions For BSD Warning FF
  Courtesy of HYUNDAI MOTOR AMERICA
Conditions for LCA warning ON
1. The entire body of the target vehicle is located before the line B.
2. Any part of the target vehicle pass the line C.
3. Any part of the target vehicle passes the line D and Hysteresis In.
4. The entire part of the target vehicle passes the line E and Hysteresis In.
5. In the all above condition, TTC (Time to Collision) is not less than 4.5 sec.
  
  Fig 4: Lane Change Assist Warning Zone - Conditions For LCA Warning ON
  Courtesy of HYUNDAI MOTOR AMERICA
Conditions for LCA warning OFF
1. The entire body of the target vehicle is located before the line B.
2. The entire body of the target vehicle pass the line C.
3. The entire body of the target vehicle passes the line D and Hysteresis Out.
4. The entire body of the target vehicle passes the line E and Hysteresis Out.
5. In the all above condition, TTC (Time to Collision) is more than 4.5 sec.
  
  Fig 5: Lane Change Assist Warning Zone - Conditions For LCA Warning OFF
  Courtesy of HYUNDAI MOTOR AMERICA
Sensor activation conditions
1. BSD & LCA switch (indicated by the switch LED) is on.
2. Vehicle Speed: 30 km/h or faster
3. Curvature radius: 100m or more
4. Relative car speed: -10 to 250km/h
  ("-" means overtaking the preceding vehicle)
Sensor deactivation conditions
1. BSD & LCA switch (indicated by the switch LED) is off.
2. Vehicle Speed: 28 km/h or slower
3. Curvature radius: 70m or less
4. Relative car speed: All except -10 to 250km/h
  ("-" means overtaking the preceding vehicle)
System control prohibition
1. The radar is covered with debris: System conditions - Blockage message is output
  information
  
  If snow, mud or stickers interfere with the sensor on the rear bumper, its detecting performance may deteriorate.
2. The radar installation is damaged by an outside shock: the error code is sent
3. BSD & LCA system fails: the error code is sent
4. The radar is overheated: System conditions - Over Temperature message is output.

Rear Cross Traffic Alert (RCTA)

Item	Specification	Remarks
Vehicle speed	0 to -10 kph	R" position
Time To Collision	4 - 36 kph	+: closing
Operating area	0.5 - 20 m	Vehicle: 20 m Bike: 15 m

It is a function to help the driver check other vehicles approaching from the rear or side when the driver reverses the vehicle which was parked front-in.
The alarming is made for the vehicle within 2 seconds based on the Time To Collision (TTC) and a person is excluded for alarming (The alarming may not be made.)
Information

Time To Collision (TTC): It means to issue an alarm in case that the estimated time before collision is 2 to 3.5 sec based on the calculation of the relative distance/relative speed (subject to change depending on the relative speed of the approaching vehicle).
The warning zone is as follows.

Fig 6: Lane Change Assist Warning Zone System Diagram
Courtesy of HYUNDAI MOTOR AMERICA