They don't come on at all or don't come on when you open the door? How about the light on the door panel? Do the map lights work?
A sudden loss of functional lights is usually just a blown fuse. Check your interior fuses and the tail light fuse that is in the fusebox under the hood.
A sudden loss of functional lights is usually just a blown fuse. Check your interior fuses and the tail light fuse that is in the fusebox under the hood.