Mercedes-Benz CL Operator's Manual page 68

Anti-theft systems
66
Unless you open a door or the trunk within
i
approximately 40 seconds after unlocking
the vehicle:
The vehicle will be locked again.
R
The anti-theft alarm system will be
R
rearmed.
Canceling the alarm
To cancel the alarm, do one of the following:
X
Insert the SmartKey into the starter switch.
X
Press button % or & on the
SmartKey.
In vehicles with KEYLESS-GO:
X
Grasp an outside door handle.
The SmartKey must be within 3 ft (1 m) of
the vehicle.
X
Press the KEYLESS-GO start/stop button.
The SmartKey must be inside the vehicle.