Mercedes-Benz 2011 CL-Class Operator's Manual page 311

Transmission
position
D
R
N
P
One or more segments light up as the vehicle
approaches an obstacle, depending on the
vehicle's distance from the obstacle.
When the first red segment lights up, you hear
an intermittent warning for about two
seconds. From the second red segment, you
hear a continuous warning. This indicates that
you have now reached the minimum distance.
Deactivating/activating PARKTRONIC
To deactivate/activate PARKTRONIC
:
Indicator lamp
;
If indicator lamp ; lights up, PARKTRONIC is
deactivated.
Warning display
Front area activated
Rear and front areas
activated
If the electric parking
brake is engaged: no
areas activated
If the electric parking
brake is released:
rear and front areas
are activated
No areas activated
Driving systems
309
Z