I purchased a 17’ RAM 2500 & noticed that the Dome / Map Lights work intermittently.
The info center on the dash will show that the doors are open, but the interior lights will remain off.
If they don’t turn on after the remote unlock & opening the door, they will turn on when the key is in the ignition.
If the truck is running, they might turn on if you open the door too, and other times not so much.
Does it appear that the lights might be LED?
As they are a bright white color.
The Dimmer switch will not turn them on as my 09’ did.