Anti-Theft Alarm System - Mercedes-Benz 420 SEL 1986 Owner's Manual

Anti-Theft Alarm System

The anti-theft alarm can be armed or
disarmed with the master key (iden­
tified by red dot) by locking or unlock­
ing either front door or the trunk.
Operation
Once the alarm system has been
armed, the exterior vehicle lamps will
flash and the horn will sound intermit­
tently when someone tries to:
• open a door
• open the trunk
• open the hood
• remove the radio
• switch on or bridge the ignition
circuit
• step on the brake pedal
• raise the vehicle, i.e. towing away.
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The alarm will last approximately
150 seconds in the form of blinking
exterior lamps. At the same time an
additional horn will sound intermit­
tently for 60 seconds, pause for
30 seconds, and repeat for another
60 seconds.
The alarm will stay on even if the arm­
ing element (a door, for example)
is immediately closed.
Note:
If the radio is removed from its
mounting when the anti-theft alarm is
armed the radio will automatically be
rendered inoperative!
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/un­
hitching a trailer, or heavy loading/un­
loading. For this purpose use the valet
key and not the master key for locking
the vehicle.
Special Function
To activate the anti-theft alarm from
the trunk, turn the master key in the
trunk lock completely to the right and
pull it out in this position.
If you want the alarm system to be
armed at the trunk only, turn the mas­
ter key in the trunk lock completely 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 master key. You can now lock or
unlock the doors and filler flap, as well
as start the engine, using the valet key.
Do not give the master key to an un­
authorized person. We recommend
that you carry the flat key safely with
you (e.g. in your wallet) so that it is
always handy. This key has the same
function as the master key.