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:
Driving off-road places greater demands on your
vehicle than driving on normal roads. Check the
entire vehicle for damage and foreign bodies
every time after driving off-road. Foreign bodies
in the wheels or drivetrain can lead to imbalances
and therefore vibrations...
Multimedia system:
Settings
Quick Access
Arm or disarm Tow-away
Protection.
The tow-away alarm is armed again in the following
cases:
The vehicle is unlocked again.
A door is opened.
The vehicle is locked again.
If quick access is unavailable, select the
Vehicle submenu in the Settings main menu
to arm or disarm the tow-away alarm...