Limits of the ultrasound
measurement
Certain conditions and objects may push ultra‐
sound measurement to its physical limits, includ‐
ing the following:
▷ Obstacles and people at the edge of the lane.
▷ Low objects already indicated, for example
kerbs, may enter the sensors' blind areas be‐
fore or after a continuous tone is given.
False alarms
If the system is approaching its limits, false
alarms may occur.
To reduce false alarms, for example in car
washes, switch off automatic activation of Park
Distance Control PDC when obstacles are de‐
tected if necessary.
Malfunction
A Check Control message is shown.
A white symbol is shown and the moni‐
toring range of the sensors is shown in
dark colour on the control display.
Park Distance Control PDC has failed. Have the
system checked by a Service Partner of the
manufacturer or another qualified Service Partner
or a specialist workshop.
Depending on the
equipment version:
emergency braking
function, Active PDC
Principle
The emergency brake function of PDC initiates
emergency braking if there is an imminent risk of
a collision.
General
Due to the system limits, a collision cannot be
prevented under all circumstances.
The function is available at speeds below walking
speed when driving or rolling in reverse.
Pressing the accelerator pedal interrupts the
brake intervention.
After emergency braking to a stop, it is possible
to continue a slow approach to the obstacle. To
approach, lightly depress the accelerator pedal
and release it again.
If the accelerator pedal is depressed for longer,
the vehicle pulls away. Manual braking is possible
at any time.
The system uses the ultrasonic sensors of Park
Distance Control PDC and Park Assist.
Safety note
WARNING
The system does not relieve you of your per‐
sonal responsibility to assess the traffic situa‐
tion correctly. There is a risk of accident. Adapt
your driving style to the traffic conditions. Addi‐
tionally, look directly to check the traffic situa‐
tion and the area around the vehicle and inter‐
vene actively where appropriate.
The Safety Information for the Park Distance
Control PDC and Park Assist also applies.
For further information:
▷ Park Distance Control, PDC, see page 278.
▷ Park Assistant, see page 286.
Temporary switch-off
The emergency braking function can be
switched off temporarily:
Confirm the message on the control display.
If the journey is continued in these environmental
conditions, no further emergency braking is per‐
formed.
Seite 281
Driver Assistance Systems
CONTROLS
281
Online Edition for Part no. 01405A1EA53 - X/20
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