Mercedes-Benz 300 E 1990 Owner's Manual page 32

Important!
If the trunk is unlocked with the
master key, the doors and fuel
filler flap will also be unlocked.
After closing the trunk, the central
locking system must again be
engaged using the key to relock
the doors and fuel filler flap.
Note:
If the fuel filler flap cannot be
opened, refer to "Manual Release
of Fuel Filler Flap" (page 90).
30
Anti-Theft Alarm System
The anti-theft alarm can be armed
or disarmed with the master key,
valet key or flat key by locking or
unlocking either front door or the
trunk.
Note:
Vehicles equipped with the anti­
theft alarm system are identified
by having a red dot on the mast­
er, valet and flat keys.
Operation
Once the alarm system has been
armed, the exterior vehicle lamps
will flash and the horn will sound
intermittently when someone:
• opens a door,
• opens the trunk,
• opens the hood,
• removes the radio,
• switches on or bridges the
ignition circuit,
• steps on the brake pedal.
The alarm will last approximately
150 seconds in the form of blink­
ing exterior lamps. At the same
time an additional horn will sound
intermittently for 60 seconds,
pause for 30 seconds, and repeat
for another 60 seconds.
The alarm will stay on even if the
activating 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 in­
operative! (This is indicated by a
dashed line across the display.)
Do not give the master key to an
unauthorized person. We recom­
mend that you carry the flat key
safely with you so that it is always
handy. This key has the same
function as the master key.