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:
Function of ABS
The Anti-lock Brake System (ABS) regulates the
brake pressure in critical driving situations:
During braking, e.g. at full brake application
or insufficient tire traction, the wheels are
prevented from locking.
Vehicle steerability while braking is ensured...
If the exterior lighting is malfunctioning, Active
Parking Assist is not available.
Objects located above or below the detection
range of the sensors, e.g. overhanging loads,
overhangs or loading ramps of trucks, or the borders
of parking spaces, are not detected during
measurement of the parking space...