officers only really have the right to search your vehicle at your consent, a warrant, or if they have a sense of fear while approaching your car (life is in grave danger because searches can only happen in the cabin of your car readily reachable by you). When there is no fear involved there can be no search, so act calm and keep you hands on the wheel (in open view) and just be polite. They have no reason to search your car and if they do it is then illegal.