My interior lights randomly come on and the dash.

Sit inside vehicle and close all doors. Push lightly at each door panel at location nearest to the door switch and if the interior light flashes, that is the door you need to be checking for proper alignment/adjustment. It could be a worn door switch cover.
The only thing I see they share is the ETACS module under the center of the dash.It looks to be the controller for the interior lighting.
See the guides below on testing wiring and using a volt meter

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

See the diagrams below for the interior lighting