CONTROLSTechnology for driving comfort and safety
66
Technology for driving comfort and
safety
Park Distance Control
PDC*
The concept
PDC assists you with parking in reverse. Acoustic
signals warn you of the presence of an object
behind the vehicle. To measure the distance,
there are four ultrasonic sensors in either
bumper.
However, an acoustic warning does not sound
until an object is approx. 24 in/60 cm from the
corner sensors, or approx. 5 ft/1.50 m from the
center sensors.
PDC is a parking aid that can indicate
objects when they are approached slowly,
as is usually the case when parking. Avoid
approaching an object at high speed; otherwise,
physical circumstances ma y lead to the system
warning being issued too late. <
Automatic mode
With the engine running or the ignition switched
on, the system is activated automatically after
approx. 1 second when you engage reverse
gear or move the automatic transmission
selector lever to position R. Wait this short
period before driving.
Acoustic signals
As the distance between vehicle and object
decreases, the intervals between the tones
become shorter. If the distance to the nearest
object falls to below roughly 1 ft/30 cm, then a
continuous tone sounds.
If the distance remains constant, e.g. when
driving parallel to a wall, the acoustic signal
stops after approx. 3 seconds.
Adjustments
The volume of the acoustic signals can be set,
refer to page 106.
Malfunction
Indicator lamp lights up: PDC has failed.
Have the system checked.
To avoid this problem, keep the sensors
clean and free of ice or snow in order to ensure
that they will continue to operate effectively.
When using a high-pressure cleaner, do not
direct the jet toward the sensors for lengthy
periods and only spray from a distance of at least
4in/10cm.
System limitations
Even with PDC, final responsibility for esti-
mating the distance between the vehicle
and any obstructions always remains with the
driver. Sensors, too, have blind spots in which
objects cannot be dete cted. Moreover, ultra-
sonic detection can reach its physical limits with
objects such as trailer tow bars and couplings,
thin and wedge-shaped objects, etc. Low
objects already indicated, such as curbs, may
enter the sensors' blind spots before or after a
continuous audible signal is given. Higher, pro-
truding objects, such as wall ledges, may not be
detectable. Therefore, always drive cautiously;
otherwise, there is a risk of personal injury or
property damage. Loud sound sources outside
or inside the car can drown out the PDC signal. <
