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:
Electronic control units are installed in your vehicle.
Control units process data which, for example,
they receive from vehicle sensors, generate
themselves or exchange between themselves.
Some control units are required for the safe
operation of your vehicle, some assist you when
driving, such as driver assistance systems, while
others enable comfort or infotainment functions...
Removing the emergency key
Press release knob
. Emergency key 2 is pushed out slightly.
Pull out emergency key
until it engages in the intermediate position.
Press release knob
again and fully remove emergency key
.
Inserting the emergency key
Press release knob ...