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are you really asking about the lights going "OFF" when the door opens? The switch is A ground connector, So that is pretty much impossible, As for the second part of the question, There is A switch inside the car that will turn on the interior light while the doors are shut, Check to see that it is not in the on position, It may be with the dash dimmer switch, i am not sure on your car. but, all cars use A grounding system to turn on the interior lights. There is power to the light ALL THE TIME. Hold on! I thought about it, See if the switch in the door area is broken.

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Q: Why do the interior lights turn off when door is open and stay on when engine not running and doors are closed in a 1996 Pontiac's grand prix?
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