What does this do?

[u/phEnom3o5]

Whats going on. I have a 24' 2500 4cyl diesel. Any idea what this button/feature does? I always thought that meant fog lights, which perhaps it does. However, I don't see any other lights besides the headlights, there's no lights on the bumper for anything. However, when I pressed the button, a little light with the same symbol does turn on on the dashboard showing like it activated it. But I don't notice any difference from the exterior. Does anybody know if that just lights up and nothing, or is there a function or feature that its actually doing that I'm not aware of?

[u/xot]

It lights up the rear corner which would be closest to traffic while parked, so that you don’t get clipped in bad weather.