Mercedes-Benz 300 SD-Turbo Diesel 1985 Owner's Manual page 19

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Anti-Theft Alarm System
The anti-theft alarm can be armed or
disarmed with the master key (identi­
fied by red dot) by locking or unlock­
ing either front door or the trunk.
Operation
Once the alarm system has been
armed, the vehicle lamps will flash and
the horn will sound interm ittently
when an unauthorized person tries to:
open a door
open the trunk
remove the radio
switch on or bridge the steering
lock
step on the brake pedal
raise the vehicle, i.e. tow ing away.
The alarm will last approxim ately
150 seconds in the form of blinking
exterior lamps. A t the same tim e an
additional horn will sound interm it­
tently fo r 60 seconds, and repeat fo r
another 60 seconds after a 30 second
pause.
The alarm will stay on even if the arm­
ing elem ent (a door, fo r example) is
im m ediately closed.
To avoid setting off the alarm uninten­
tionally, do not arm the alarm system
in the following situations; e.g.: Auto
ferry, auto train, when hitching/
unhitching a trailer, or heavy loading/
unloading. For this purpose use the
supplem entary key and not the mas­
te r key fo r locking the vehicle.
Keys
Special Function
To activate the anti-theft alarm from
the trunk, turn the m aster key in the
trunk lock com pletely to the right and
pull it out in this position.
If you w ant the alarm system to be
armed at the trunk only, turn the mas­
te r key in the trunk lock com pletely to
the right and pull it out in that posi­
tion. Then disarm the rest of the vehi­
cle by unlocking either front door with
the m aster key. You can now lock or
unlock the doors and filler flap, as well
as start the engine, in the usual man­
ner using the supplem entary key.
Do not give the master key to an
unauthorized person. We recom mend
that you carry the flat key safely with
you (e.g. in your wallet) so that it is
always handy, if needed. This key has
the same function as the master key.
Doors

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