Mercedes-Benz GLC : Vehicles with Parking Assist PARKTRONIC / System failure
If the rear view camera is not operational, the
following display appears in the multimedia system.

The following camera views are available in the
multimedia system:
Normal view
Yellow lanes marking the course
the tires
will take with the current steering angle
(dynamic)
Yellow guide line, vehicle
width (driven surface)
depending on the current steering
angle (dynamic)
Red guide line at a distance of
approximately
1...
The rear view camera will not function or will
only partially function in the following situations:
The tailgate is open.
There is heavy rain, snow or fog...
Other information:
NOTE Engine damage due to water
ingress
Take care not to point
the water jet
directly towards the air inlet grille below
the hood.
Observe the legal requirements, e.g. in a number
of countries, washing by hand is only permitted
in specially designated wash bays...
If your vehicle is accordingly equipped, you can
connect your smartphone or another mobile end
device to the vehicle. You can then control them
by means of the control elements integrated in
the vehicle. Images and audio from the smartphone
can be output via the multimedia system...