cabin dome light cycles on & off all by itself, killing the battery on 2006 Saturn Ion

Haven't had care for long, so far really like it. However, left parked for 2 weeks, & wouldn't start. We were able to figure out that the interior dome light has a gremllin. Light goes off like it should when we get out of car, but at some point the roof dome light comes on all by itself; enough to kill the battery. We can remove fuse, but that isn't going to fix the problem. Ideas?

Asked by for the 2006 Saturn Ion
Hey Valerie,
This is going to require an electrical circuit diagnosis. This can be fairly involved, especially with interior lighting, due to all the switches, relays and lights that are a part of the system. You also can have an alarm system tied into it as well, which makes it even more complicated. This may need to go to a repair shop!
If you don't have one, look here: