maintenance BMW 325XI SEDAN 2005 Service Manual

85 Technology for safety and driving convenience
Park Distance Control (PDC)*The conceptPDC assists you when you back into a
parking space. Acoustic signals alert
you to the momentary distance to an
object behind your vehicle. The system
features four ultrasonic sensors
mounted in your rear bumper. The mon-
itoring range for the two corner sensors
extends outward roughly 2 ft/60 cm,
while two centrally located sensors
detect objects at distances of up to
approx. 5 ft/1.50 m.
PDC is a parking aid that can
identify objects if they are
approached slowly, as is generally the
case when parking. Avoid driving
towards objects rapidly; due to underly-
ing physical principles, the system may
otherwise alert you too late for you to
take evasive steps.<
The system starts to operate automati-
cally approx. one second after you shift
into Reverse or move the selector lever
into the R position with the ignition key
in position 2.
Let this short period elapse before
driving backwards.<
PDC is deactivated when you shift back
out of reverse.
You can have a signal set to con-
firm that the PDC has been acti-
vated. The signal then sounds when
you shift into Reverse or move the
selector lever into the R position. indicated by a tone sounding at various
intervals. As the distance between vehi-
cle and object decreases, the intervals
between the tones become shorter. A
continuous tone indicates the pres-
ence of an object less than 1 ft/30 cm
away.
The warning signal is canceled after
approx. three seconds if the distance to
the object remains constant during this
time – if you are moving parallel to
a wall, for instance.
System malfunctions will be indicated
by a continuous high-pitched tone
when the system is activated the first
time. Please refer the problem to your
BMW center.
PDC does not remove the driver's
personal responsibility for evaluat-
ing the distance between the vehicle
and any objects. Even when sensors
are involved, there is a blind spot in
which objects cannot be detected. This
applies especially in those cases where
the system approaches the physical
limits of ultrasonic measurement, as
occurs with tow bars and trailer cou-
plings, and in the vicinity of thin or
wedge-shaped objects. Moreover, low
objects that have already been
detected – such as a curb edge – can
disappear out of the detection range of
the sensors before a continuous tone
sounds.
Loud sources of sound from outside or
inside the vehicle could drown out the
PDC signal tone.<
Keep the sensors clean and free
of ice or snow in order to ensure
that they will continue to operate effec-
tively.
Do not apply high pressure spray to the
sensors for a prolonged period of time.
Always maintain a distance of more
than 4 in/10 cm.<
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87
Deactivating the DSC and the
DTCHold the DSC button down for at least
3 seconds. The indicator lamp and the
yellow brake warning lamp will remain
on continuously.
The systems for enhancing stability and
traction are deactivated, and there is no
active braking intervention or torque
control.
To maintain vehicle stability,
always drive with the DSC acti-
vated whenever possible. cator lamp or the indicator lamps will go
out. DTC is deactivated.
The laws of physics cannot be
repealed, even with DSC. It will
always be the driver's responsibility to
drive in a manner that matches road
conditions. This is why you should not
use the additional safety margin the
system provides as an excuse to take
risks.
Whenever the DTC is activated, the
DSC is switched off and performs minor
stabilizing intervention.
Do not make any modifications to the
DSC system. Allow only authorized
technicians to perform service proce-
dures on the DSC.<
Dynamic Stability Control (DSC)
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89
Reactivating the DSCPress the button again; the indicator
lamp goes out.
The laws of physics cannot be
repealed, even with DSC. It will
always be the driver's responsibility to
drive in a manner that matches road
conditions. This is why you should not
use the additional safety margin the
system provides as an excuse to take
risks.
The system does not intervene to
enhance vehicle stability when
switched off.
Do not make any modifications to the
DSC system. Allow only authorized
technicians to perform service proce-
dures on the DSC. OverviewControlsMaintenanceRepairsDataIndex

91
Flat Tire Monitor*The conceptAs you drive, the Flat Tire Monitor
keeps track of pressure levels in all four
tires. The system alerts you whenever
the inflation pressure of a tire falls sig-
nificantly below the pressure of another
tire.
The system actually detects pressure
loss by monitoring differences in the
relative speeds of the four wheels. It
interprets variations outside specified
limits as severe pressure loss, and then
responds by generating a warning.Functional requirementsIn order for the Flat Tire Monitor to learn
the correct tire inflation pressure,
please do the following:
1. Check the tire inflation pressures in
all tires
2. Compare them with the tire inflation
pressure table on page 26 and cor-
rect them, if necessary
3. Initialize the system.
System limitations
The Flat Tire Monitor cannot pro-
vide you with advance warning of
sudden and severe tire damage caused
by external factors and does not detect
the balanced and very gradual pressure
loss that takes place in all four tires
over an extended period of time.<
On the other hand, the following situa-
tions can lead to a delayed detection of
pressure loss and even to the system
not functioning:
>Driving on snow-covered or slippery
roads
>Performance-oriented driving: slip at
the drive wheels, high levels of lateral
acceleration
>When driving with snow chains, false
warnings and undetected pressure
losses may occur
>When driving with a space-saver
spare tire, the Flat Tire Monitor can-
not function.
Initializing the system
Each time you correct the pres-
sure in a tire, or change a wheel or
tire, reinitialize the system immediately
afterwards. This requires a bit of driv-
ing.<
1. Before driving off, start the engine
but do not start driving
2. Press the button as long as you need
to until the yellow indicator lamp in
the instrument cluster lights up for a
few seconds
3. Drive off.
It takes a few minutes before the Flat
Tire Monitor can detect a flat tire and
issue a warning.
OverviewControlsMaintenanceRepairsDataIndex

93 Lamps
Parking lamps/Low beamsParking lamps
The front, rear and side vehicle
lighting is switched on. You can
use the parking lamps to signal
the position of the vehicle when it is
parked. For lighting on one side for
parking as an additional feature, refer to
page 94.
Low beams
When the ignition is switched off
while the low beams are on, the
headlamps go out and only the
parking lamps remain on.
Follow me home lampsWhen you activate the headlamp
flasher after parking the vehicle with the
lamps turned off, the low-beam head-
lamps will come on for a short time.
You can also have this function
deactivated. having turned the ignition key to posi-
tion 0, you will hear an acoustic signal
for a few seconds to remind you that
the lamps have not been switched off.Daytime driving lamps*If you desire, the lamp switch can be
left in the second position: when the
ignition is switched off, the external
lighting is also switched off.
You can have the activation set-
tings for the daytime driving lamps
programmed on your vehicle.<
Automatic headlight control*
When the switch is set to this
position the system automati-
cally activates and cancels the
low beams in response to changes in
ambient light – in tunnels, at dusk, etc. –
and in the event of rain and snow.
The vehicle's external lights
remain on constantly when you
switch on the front fog lamps after the
headlights have come on automati-
cally.<
Automatic headlight control can-
not serve as a substitute for the
driver's judgement in determining when
the vehicle lights should be switched
on. For example, the sensors are not
able to detect fog. To avoid safety risks,
you should respond to these kinds of
low-visibility situations by switching the
headlights on manually.<
You can have the sensitivity of
your vehicle's automatic head-
light control adjusted.<
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95
Fog lamps*Front fog lamps
The green indicator lamp in the
instrument cluster lights up to
indicate that the front fog lamps
are on.
If the automatic headlight control
is on, the low beams will come on
automatically whenever you activate
the front fog lamps.<
Interior lampsThe interior lamps operate automati-
cally.To switch the interior lamps on
and off manuallyPress button 1 briefly:
If you want the interior lamps to remain
off all the times, press and hold the but-
ton for approx. 3 seconds.
Press the button briefly to revert to nor-
mal operation.Front reading lamps*Switch on and off with the button 2
adjacent to each lamp.
Rear reading lampsSwitch on and off with the button adja-
cent to each lamp.
In order to prevent battery dis-
charge, all of the lamps in the
vehicle are automatically switched off
approx. 15 minutes after you turn the
ignition key to position 0. behind translucent lenses serve as the
light sources for many of the controls
and displays in your vehicle. These
light-emitting diodes are related to con-
ventional lasers, and legislation defines
them as light-emitting diodes, Class 1.
Do not remove the protective lens
and avoid staring directly at the
unfiltered beam for several hours, as
inflammation of the retina could
result.<
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97
1Air onto the windshield and the side
windows
2Air for the upper body area99
3Air to the footwell
4Air supply/Blower98
5Temperature98
6Air distribution98
7Rear window defroster98
8Air conditioning98
9Outside air/Recirculated-air
mode98Air conditioning
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99
Draft-free ventilationYou can adjust the blower controls for
the upper body area to obtain the opti-
mum airflow rates and directions for
your personal requirements:
1Rotary dials for infinitely variable
opening and closing of the vent out-
lets
2Selector levers for airflow direction
3Rotary dial allows you to control the
temperature of the airflow from these
outlets as desired
MicrofilterThe built-in microfilter removes dust
and pollen from the incoming air. Your
BMW center will replace it during regu-
larly scheduled maintenance. A sub-
stantial reduction in airflow indicates
that the filter needs to be replaced
before scheduled maintenance.
To defrost windows and remove
condensation1. Set the blower speed control for the
air supply to position 4
2. Turn the rotary temperature control
completely to the right – red
3. Rotary control for air distribution to
position
4. Switch on the rear window defroster
to defrost the rear window.
Air conditioning
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101
1Air onto the windshield and the side
windows
2Air for the upper body area103
3Air to the footwell103
4Air inlet for interior temperature
sensor – please keep clear and
unobstructed
5Outside air/Automatic recirculated-
air control (AUC)/Recirculated
air103
6Automatic air distribution102
7Individual air distribution102
8Temperature102
9Display for temperature102
and air supply102
10 Air supply/Blower102
11 To defrost windows and remove
condensation102
12 Air conditioning102
13 Rear window defroster103Automatic climate control*
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103
Outside air/Automatic
recirculated-air control (AUC)/
Recirculated air
You can respond to unpleasant
external odors or pollutants by
temporarily stopping the flow of outside
air. The system then recirculates the air
currently within the vehicle.
Press the button repeatedly to select
one of three different operating modes.
>Indicator lamps off: outside air supply
is on
>Left indicator lamp on – AUC mode:
the system recognizes pollutants in
the outside air and blocks the flow of
air when necessary. The system then
recirculates the air currently within
the vehicle. Depending on the air
quality, the automatic system then
switches back and forth between
outside air supply and recirculation of
the air within the vehicle
>Right indicator lamp on: the flow of
external air into the vehicle is perma-
nently blocked. The system then
recirculates the air currently within
the vehicle.
If the windows should fog over in
the recirculated-air mode, switch
this mode off and increase the air sup-
ply as required.<
Rear window defroster
When the rear window defroster
is activated, the indicator lamp
comes on. The rear window defroster
switches off automatically.
You can have your vehicle pro-
grammed in such a way that the
rear window defroster switches on
automatically. This occurs within 5 min-
utes after starting the engine when out-
side temperatures are below approx.
397/+46.<
Draft-free ventilationYou can adjust the blower controls for
the upper body area to obtain the opti-
mum airflow rates and directions for
your personal requirements:
1Rotary dials for infinitely variable
opening and closing of the vent out-
lets
2Selector levers for airflow direction
3Rotary dial allows you to control the
temperature of the airflow from these
outlets as desired
Automatic climate control*
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