Mercedes-Benz 2008 M-Class Operator's Manual page 108

Arming the alarm system
The alarm system indicator lamp is located
to the lower left of the hazard warning
flasher.
1 Alarm system indicator lamp
Lock the vehicle with the SmartKey or
with KEYLESS-GO* ( page 68).
The turn signal lamps flash three times
to indicate that the vehicle is locked.
The alarm system is armed within ap-
proximately 10 seconds. Alarm system
indicator lamp 1 flashes.
i
If the turn signal lamps do not flash three
times, one of the following elements may not be
properly closed:
a door
the tailgate
Close the respective element and lock the
vehicle again.
Disarming the alarm system
Unlock the vehicle with the SmartKey
or with KEYLESS-GO* ( page 38).
The turn signal lamps flash once to
indicate that the alarm system is
disarmed. Indicator lamp 1 goes out.
i
The alarm system will rearm automatically
again after approximately 40 seconds if neither a
door nor the tailgate is opened.
Safety and Security
Anti-theft systems
Canceling the alarm
To cancel the alarm:
With the SmartKey
Insert the SmartKey in the starter
switch.
or
Press the Œ or ‹ button on the
SmartKey.
With KEYLESS-GO*
Grasp an outside door handle.
The SmartKey with KEYLESS-GO must
be within 3 ft (1 m) of the vehicle.
or
Press the KEYLESS-GO start/stop
button ( page 41).
The SmartKey with KEYLESS-GO must
be inside the vehicle.
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