Rear Cross-Traffic Collision-Avoidance Assist (RCCA): (if equipped)
Rear Cross-Traffic Collision-Avoidance Assist is designed to detect vehicles approaching from the rear left and right side while your vehicle is reversing, and warning the driver that a collision is imminent with a warning message and an audible warning. Also, to help prevent collision braking assist is applied.

[A]: Rear Cross-Traffic Collision Warning operating range
[B]: Rear Cross-Traffic Collision-Avoidance Assist operating range
Warning Timing may vary depending on vehicle speed of the approaching vehicle.
Detecting sensor

[1]: Rear corner radar
Refer to the picture above for the detailed location of the detecting sensor.
For more details on the precautions of the rear corner radar, refer to Blind-Spot Collision-Avoidance Assist (BCA).