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:
HOLD function
The HOLD function holds the vehicle at a standstill
without requiring you to depress the brake
pedal, e.g. while waiting in traffic.
The HOLD function is only an aid. The responsibility
for the vehicle safely standing still remains
with the driver...
When the ignition is switched on, a self-test is
performed during which the two PASSENGER
AIR BAG ON and OFF indicator lamps light up
simultaneously.
The status of the front passenger airbag is displayed
via the PASSENGER AIR BAG indicator
lamps after the self-test:
ON is lit: the front passenger airbag may
deploy during an accident...