Mercedes-Benz 2011 E-Class Sedan Operator's Manual page 198

Driving systems
196
Transmission
position
D
R or N
P
One or more segments light up as the vehicle
approaches an obstacle, depending on the
vehicle's distance from the obstacle.
From the:
sixth segment onwards, you will hear an
R
intermittent warning tone for
approximately two seconds.
seventh segment onwards, you will hear a
R
warning tone for approximately two
seconds. 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.
i PARKTRONIC is automatically activated
when you turn the SmartKey to position 2
in the ignition lock.
Warning display
Front area activated
Rear and front areas
activated
No areas activated