Mercedes-Benz 2013 CL Operator's Manual page 74

Theft deterrent locking system
72
To stop the alarm using the SmartKey:
X
insert the SmartKey into the ignition lock.
The alarm is switched off.
or
Press the % or & button on the
X
SmartKey.
The alarm is switched off.
To stop the alarm using KEYLESS-GO:
X
grasp the outside door handle. The
SmartKey must be outside the vehicle.
The alarm is switched off.
or
Press the Start/Stop button on the
X
dashboard. The SmartKey must be inside
the vehicle.
The alarm is switched off.