Mercedes-Benz 380 SE 1984 Owner's Manual page 17

When the rear door buttons are
pushed down, the rear doors cannot
be opened from the outside or the
inside. They can be opened after
pulling buttons up.
The driver's door can be locked only
if it is closed and the door lock has
properly engaged.
Central Lock System
The central lock system locks or
unlocks the driver's door, the other
vehicle doors, the fuel tank filler flap
and the trunk lid simultaneously.
The lock buttons of the other vehicle
doors must then move together with
the lock button of the driver's door.
If this does not happen, the lock of
the respective door is not properly
engaged. Open the door again and
shut it correctly.
The front passenger door and the
rear doors can also be locked or
unlocked individually from inside.
The front passenger door can also
be locked and unlocked with the
key.
Keys
With the central lock system in the
locked position, the trunk lid can
also be unlocked individually: To do
so, turn the master key to the left as
far as it will go, then depress the
trunk lid lock push button with the
key and open the trunk. Turn the
key to its initial position and
withdraw it. To lock the trunk lid,
close it firmly; the trunk lid will then
be locked by the central lock
system again.
The trunk lid can also be locked
independently (for instance, to leave
the vehicle in a workshop) without
actuating the central lock system.
Turn the master key to the right as
far as it will go and withdraw it. In
this case the trunk lid can only be
unlocked with the master key which
must be inserted and turned back to
the left.
Note:
If the fuel tank filler flap cannot be
opened, refer to "Unlocking the Fuel
Filler Flap" (page 79).
Doors