My 98' got rear-ended. It was just enough that the trunk ajar was barely making contact. But at night when it got colder, the switch would open and the light inside the trunk would come on. Took forever to figure that one out. Happened to leave the back seats folded down and glanced out the window late that night and saw the glow from the trunk light. Just to show you that overnight, there can be something else causing the draw.