I do know if you get out of synch i.e. arm the system or disarm the system froma different door it will set off the alarm adn you to go around and find which door weas last used!!!!! Thats why I disabled my alarm on my old W126!!
never heard of this... what are you on about. As far as I know the alarm on the 140 can be arm and dis-arm from either doors or the trunk.