On my 2008 320 CDI (same body features as your 450) there IS NO EXIT mode. The mechanic (Not service tech) explained to me that M-B had too much trouble with this feature and took it off. (It used to be that when the key was removed, the seat would retract and the steering wheel raise automatically. Then, depending on which key was inserted, the steering / seat would go to yours or your wife's preferred position -- no more!)
