Not a dome light. Looks like infrared sensor.

I believe we have one of those. Ours is a back up light sensor. As you back up you can see it on your rear view mirror guiding you if you are close to obstructions on your left and right. It kind of looks like KITs eyes from knight Rider. :-)

Parking sensor visual aid for the rear sensors, like the one you see between the gauges on the digital screen for the front parking sensors.