Hi Luke1, as I understand it, it all depends on the car you are using.
The control for switching cameras will change your view to whatever view is coded for that car.
Usually, cars that come with the game have just cockpit view, front view, outside view and top view, but mod cars have other views, like passenger, back seat and more (like in busses). So it all depends on the views coded with the car, if it has passenger seat view for example, it will be accessible switching camera positions with the key assigned to that control. (In version 1.3 the controls for switching camera positions are "Next camera" and "Previous camera")
Sorry for my bad english.