Have a '99 E320. Seat belt buckle hit door latch when attempting to shut drivers door and caused the following. Interior lights come on when car is started but do not fade or go off. When car is turned off, Remove Key prompt and beep starts immediately. Thus, key can not be left in ignition with engine off. Other doors do no unlock automatically when drivers door is opened. Interior lights go on and stay on when car is locked. What part do I need?