So imagine you just pull into your driveway, you turn the car off, pull the key from the ignition, open the door and get out. You close the door behind you and the interior lamps go off. Now if you open one of the rear doors, the interior lamps go on, and if you close the door, the lights go off. If you open one of the front doors and close it, the interior lamps will stay on until; the battery goes dead, you get in and start the engine, or key ignition from Off to On then Off again. Any idea behind this quirky behavior? Is it by design or is there a malfunction of some kind?