99 Eddie Baur 2wd, Occasionally the interior and running board lights stay on, I think it might be a relay. Has anybody else had this problem?

 

Try opening each door and where the door latch is on the door, spray W-D 40. You will have to use your fingers and open and close the latch to help get the lubricant in there. My interior lights, running board lights and door latch light on the dash comes on. I spray each door latch and this does the trick. First time this happened I took it to the mechanic and they said it was the door latch sensor, had it replaced ($100) and 6 months later it happened again. Try the spray first!