2018 Chevy mirror - what are these and what do they do?

[Wayne]

These look like LEDs, but I can make them turn on, nor have I ever seen them do anything. Anyone have know what they are? @ls1mike has a very similar truck, hoping he will know.

 

[dnewton3]

Certainly look like LEDs. Are they puddle lights; do they focus downward and only come on at night with the door open?

 

[Wayne]

I finally figured this out.

They are LEDs, which light the side and rear of the ground near the truck. They work only when the cargo light button is in the "On" position AND the truck is in Park, Reverse, or Neutral. I turned them on while my wife was standing beside the truck in the dark. They are very bright, or at least that's what she told me.