Collision Avoidance?

I don't think I'm calling this the proper thing, so that's maybe why I can't find my answer using the Search function.

My wife has a 2016 Prius. It has the rear camera and the blind spot warning system. It used to be that when she was backing out of a parking stall and a car was coming from either side, it would warn her of the vehicle. Now we're not getting any warning at all. The camera works and the blindspot feature in the side mirrors works...but no warning of anything from the rear and sides.

What do I call this? (So I can do a search later.) And is there something we've done to turn that feature off? If so, how do I enable it again?

Thank you.
Chris

 

Thank you! I did some searching on option packages for 2016 Prius's and found that was what it was called. Now to figure out how we've inadvertently turned it off.

Again, thank you.
Chris

 

I looked up the references in the Owner's Manual and it says it may not detect smaller objects like pedestrians. And it was a pedestrian walking by that the system didn't notice, when my wife told me about it. We'll check it out in the daytime with our cars and see if it works then. I suspect the system is working just fine...but not like my wife thinks it should.

Thanks for replying.

Chris