O2 sensors BMW X3 3.0I 2004 E83 Owner's Manual

Reference
At a glance
Controls
Driving tips
Mobility
49
Technology for comfort, convenience
and safety
Park Distance Control PDC*
The concept
PDC provides extra safety and conven-
ience during parking maneuvers. Signal
tones indicate the current distance to an
object behind or in front of your vehicle.
Four ultrasonic sensors in both the
bumpers monitor the distance to the near-
est object.
The front and rear sensors on the corners
have a range of approx. 2 ft/60 cm. The
two rear middle sensors have a range of
approx. 5 ft/1.50 m and the two front mid-
dle sensors of approx. 2.6 ft/80 cm.
PDC is a parking aid that can indicate
objects when they are approached
slowly, as is usually the case when parking.
Avoid approaching objects too fast, other-
wise the system may give warning of phys-
ical obstacles too late.<
If you are driving with a trailer, the rear sen-
sors are unable to make proper measure-
ments Ð so they do not switch on.
Automatic mode
As of ignition key position 2, the system
automatically assumes operational status
after a few seconds each time you engage
reverse gear or selector-lever position R.
Wait this short period before park-
ing.<
You can have a signal tone pro-
grammed into the system to verify
that the PDC is active.<
Automatic deactivation
After driving a distance of more than
approx. 160 ft/50 m or exceeding a speed
of approx. 20 mph/30 km/h, the system
switches off and the indicator lamp goes
out. You can reactivate the system manu-
ally as needed.
Manual mode
Press the button; the indicator lamp comes
on.
Manual deactivation
Press the button again; the indicator lamp
goes out.
Signal tones
The distance to an object behind the vehi-
cle is signaled in accordance with the posi-
tion by an intermittent tone from a loud-
speaker in the rear-end.
The distance to an object in front of the
vehicle is signaled by an intermittent tone
from a loudspeaker beneath the instrument
cluster.
As the distance between vehicle and object
decreases, the intervals between the tones
become shorter. The signal tone becomes
continuous once the distance to the near-
est object falls to below roughly 1 ft/30 cm.
The warning signal is canceled after
approx. 3 seconds when the distance to an
object remains constant during this time,
if you are moving parallel to a wall, for
instance.
Malfunction
The indicator lamp flashes and a short
steady signal tone is sounded.
Switch the system off and have the cause
of the malfunction corrected by your BMW
Sports Activity Vehicle Center.

Technology for comfort, convenience and safety
50
Limits of the system
Even with PDC, final responsibility for
estimating the distance between the
vehicle and any obstructions always
remains with the driver. Even when sensors
are involved, there is a blind spot in which
objects cannot be detected. The system is
also subject to the physical limits that apply
to all forms of ultrasonic measurement,
such as those encountered with tow bars
and trailer couplings, or thin and wedge-
shaped objects etc. Low objects already
displayed, e.g. a curb, can also disappear
from the detection area of the sensors
again before a continuous tone sounds.
Loud sources of sound, inside and outside
the vehicle, could drown out the PDC sig-
nal tone.<
Keep the sensors clean and free of ice
or snow in order to ensure that they
will continue to operate effectively.
Do not apply high pressure spray to the
sensors for a prolonged period of time.
Keep the spray at least 4 in/10 cm away
from the sensors.<
Driving stability control
systems
Your BMW is equipped with an extended
array of systems designed to enhance and
maintain vehicle stability under extreme
conditions. The following section describes
these functions based on ABS, DSC, HDC
and xDrive.
Antilock Brake System ABS
ABS enhances active safety by preventing
the wheels from locking under braking. The
vehicle continues to be steerable during
hard braking.
ABS also includes Electronic brake-force
distribution EBV.
Safe braking, refer to page 77.
Electronic brake-force distribution
EBV
EBV controls the brake system's applica-
tion pressure at the rear wheels to ensure
stable deceleration.
Dynamic Brake Control DBC
The Dynamic Brake Control actively sup-
ports the driver in dangerous braking situa-
tions. Quickly pumping the brake pedal
increases the braking effect with low pedal
pressure so that the shortest possible
braking distance is achieved. This system
exploits all of the benefits provided by ABS.
Do not reduce the pressure on the brake
pedal for the duration of the brake applica-
tion. DBC is deactivated when you release
the brake pedal.
Dynamic Stability Control DSC
The concept
DSC maintains vehicle stability, even in
critical driving situations.
The DSC is operational every time you start
the engine.
The system optimizes the driving stability
during acceleration and when starting from
a standstill. The system recognizes any
tendency for the vehicle to assume an
unstable attitude such as oversteer or
understeer; it then counteracts this ten-
dency with a combination of graduated
reductions in engine torque and selective
braking intervention at individual wheels.
DSC provides optimal stability within the
limits defined by the laws of physics.
The laws of physics cannot be
repealed, even with DSC. An appro-
priate driving style always remains the
responsibility of the driver. Avoid using the
additional safety margin provided by the
system as an excuse for taking unneces-
sary risks.
Do not make any modifications to the DSC
system. Never allow anyone other than
authorized professional technicians to
carry out service or repairs on the system.<