Mercedes-Benz 380 SE 1984 Owner's Manual page 18

Keys Doors
Burglar Alarm System
Switching alarm system on or off:
The alarm system is switched on or
off by locking or unlocking the front
doors with the master key (square
head, marked with a red and
projecting lug which can also be felt
at night).
With the warning system switched
on an additional horn will sound
intermittently for approx.
30 seconds if an unauthorized
persons opens a door, the hood or
the trunk lid, turns or bridges the
steering lock (ignition) or actuates
the service brake. It keeps on
sounding for approx. 30 seconds
even if the triggering component
(e.g. the door) is closed again
immediately.
Special functions:
The trunk lid can be opened only
when the alarm system is switched
off.
Trunk lid emergency release:
If the trunk lid cannot be opened
with the alarm system switched off,
it can be opened by means of an
emergency control. For this
purpose, remove rear seat cushion
and fold back LH cover. Then pull
the ring of the emergency release
cable while another person at the
same time opens the trunk lid.
If the vehicle is left in a workshop,
garage etc.,
switch off alarm system. Only leave
secondary key (rounded head) with
the vehicle.
Notes:
Never hand over master key to
unknown persons. We recommend
that you keep the flat key on you in
a safe place (e.g. in your wallet) so
that it is accessible at any time.