Mercedes-Benz 2012 B Class - Manual (Page 173)

From the:
R
sixth segment onwards, you will hear an
intermittent warning tone for
approximately two seconds.
R
seventh segment onwards, you will hear a
warning tone for approximately two
seconds. This indicates that you have now
reached the minimum distance.
Deactivating/activating PARKTRONIC
:
Indicator lamp
;
To deactivate/activate PARKTRONIC
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.
Driving systems
171
Driving and parking
Z