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:
Refueling the vehicle
WARNING Risk of fire or explosion from
fuel
Fuels are highly flammable.
Fire, open flames,
smoking and creation
of sparks must be avoided.
Switch off the ignition
and, if available,
the stationary heater, before and while
refueling the vehicle...
..