[gw84]

There is probably a button on the car where the door connects (at the hinge). when the door is closed the button is pushed and the lights go off. When you open the door the button is released...lights come on. Based on your description of the problem, my guess is that the button is stuck. When the door is open, your button probably doesn't release. Try finding the button (it's usually surrounded by a black rubbery shroud) and seeing if it's stuck. My lumina is quite similar to your monte, so the button should be in the same place.