The interior lights stay on when we remove keys,

Can you tape a coin or two onto the door at the spot that hits the light switch? If not, just remove the bulbs.

one of the door ajar switches are sticking. needs to be put on the computer to find out which one. only other way is to go around and unplug the switches until your light shuts off.

you probably have a bad door switch you may need to manualy unplug each switch one at a time to find the right one

one of the door/van loading door switches has failed it thinks a door is open so the the interior light stays on and the door open warning will ding the interior light should have a switch to disable it or take out the bulb but you cant stop the dinging until you find the faulty latch switch and fix it

Sounds like one of the door triggers has continuity to earth,(Shorted) Test them all with a multi meter.

Cheers CeeBee

Sounds like a fuse issue. check your panel for popped accessory fuse.

the overhead light issue may be the door close switch

Clean the contacts on the side door with course steel wool then lube them with die-electric grease, avail from most parts stores or the dealer, this should take care of the problem, if not u will have to remove the rivets and install new switch contacts both on the door and the door jam.

Might sound funny but check the rheostat knob that dims the interior lights, sounds like its set to always on. Check the dome light too, some have always on and on when door is open settings.