control BMW 320i 2001 Repair Manual

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DSC Ð BMW 325xi, 330xiThe conceptDSC maintains vehicle stability, even in
critical driving situations.
The system enhances vehicle stability
during acceleration and when starting
up from a full stop, and optimizes trac-
tion as well. In addition, it recognizes
unstable vehicle conditions, such as
understeering or oversteering, and, as
far as is possible within the laws of
physics, helps keep the car on a steady
course by reducing the RPMs and
brake applications to the individual
wheels.
The DSC is operational every time you
start the engine. DSC contains the
functions of ADB-X and CBC, refer to
page 119.
The ADB-X (automatic differential
braking) replaces the function of
conventional differential and transverse
lock through brake intervention, and
increases traction whenever conditions
merit, e. g. when driving on snow-
covered roads.Indicator lamp
The indicator lamp in the instru-
ment cluster goes out shortly
after you switch on the ignition.
Refer to pages 21, 22.
Indicator lamp flashes:
DSC controls the drive and braking
forces.
Indicator lamp lights up permanently:
DSC has been switched off via the
button; ADB-X is operational.
ADB-X intervention is not indicated.
If the warning lamp does not go
out after pressing the DSC button
repeatedly, then both the DSC and
ADB-X are defective. Consequently,
interventions to increase driving
stability (as described in the preceding
column) are not available.<
You can drive perfectly well without
DSC. Please contact your BMW center
in the event of a fault, refer to
pages 21, 22.
Switching the DSC offPress the DSC button; the indicator
lamp comes on and stays on.
The DSC has been switched off and the
ADB-X is designed for maximum
output.
In the following exceptional circum-
stances, it may be effective to deacti-
vate the DSC for a short period:
>When rocking the vehicle or starting
off in deep snow or on loose surfaces
>When driving with snow chains.
Refer also to page 122.
To maintain vehicle stability,
always drive with the DSC on
whenever possible.<460de313

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IndexDataTechnologyRepairsCar careControlsOverview
DSC Ð BMW 325xi, 330xiReactivating 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repealed, even with DSC.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.
Whenever the DSC has been switched
off, it will not perform any stabilizing
intervention.
Do not make any changes to the DSC.
Allow only authorized technicians to
perform service procedures on the
DSC.<
For additional details concerning DSC,
please refer to the chapter "Advanced
technology" on page 179.

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Tire Pressure Control (RDC)
*
The conceptRDC monitors the tire pressures at all
four wheels, even when the vehicle is
moving. The system provides an alert
whenever the inflation pressure drops
significantly below the specified pres-
sure in one or more tires.
In order for the system to "learn" the
correct tire inflation pressure, check the
inflation pressure in all tires. Refer to
the table of "Tire inflation pressures"
(page 28) and correct the pressures if
necessary. Then activate the system.
This indicator lamp in the instru-
ment cluster will inform you if
the tire pressure is not correct.
Activate the systemDepending on the type of equipment,
the switch either has the letters RDC on
it or the RDC-symbol.
1 Turn the ignition key to position 2
(do not start the engine).
2 Press the switch long enough for the
yellow indicator lamp in the instru-
ment cluster to light up for a few
seconds.
3 After a few minutes driving time, RDC
sets the current inflation pressure in
the tires as the target values to be
monitored.
You will only have to repeat this proce-
dure following a correction of the tire
inflation pressure. Otherwise, RDC
functions automatically when the igni-
tion key is in position 2, and thus oper-
ates whenever the vehicle is driven.460de314
In the event of loss in tire
pressureIf the inflation pressure has dropped
significantly over a long period of time
(which is normal for any tire), the indi-
cator lamp will come on with a yellow
lamp.
This alerts you to have the tires inflated
to the specified pressures as soon as
possible.
If you are prompted to check the
tire pressure shortly after a
correction has been made, this indi-
cates that the corrected values were
not accurate. Please check the inflation
pressure again and make corrections
according to the inflation pressure
table. Then activate the system once
again.<

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IndexDataTechnologyRepairsCar careControlsOverview
Tire Pressure Control (RDC)
*
In the event of a flat tireIf there is a tire failure with loss of pres-
sure, the indicator lamp comes on with
a red lamp. In addition, an acoustic
signal is sounded.
If this occurs, reduce vehicle speed
immediately and stop the vehicle in a
safe location. Avoid hard brake applica-
tions. Do not oversteer. Replace the
wheel and flat tire.
The space-saver spare tire is
provided for temporary use only in
the event of a tire failure. It does not
have RDC electronics and is not moni-
tored. A full-size spare tire that has the
same dimensions as the tires already
mounted on the vehicle is equipped
with the necessary RDC electronics,
and will be also be monitored once the
tires have been mounted and the
system activated.<
RDC cannot alert you to severe
and sudden tire damage caused
by external factors.<
Have the tires changed by your
BMW center.
Your BMW center has been trained to
work with the RDC system and is
equipped with the necessary special
tools.<
System interferenceLocal devices using the same radio
frequency can interfere with the RDC.
The yellow indicator lamp will come on
during the malfunction.
The indicator lamp also comes on
>in the event of a system fault
>if a wheel is mounted without the
appropriate electronics
>if, in addition to the spare tire
*, addi-
tional wheels with RDC electronics
are on board.
Please contact your BMW center for
additional information.

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IndexDataTechnologyRepairsCar careControlsOverview

High beams/Parking lamps

Fog lamps Interior lamps

1 High beams (blue indicator lamp)
2 Headlamp flasher (blue indicator
lamp)
3 Parking lamps

Parking lamp, left or right

As an additional feature, you can
illuminate your vehicle on either side
for parking, if you wish to do so:
With the ignition key in position 0, push
the lever in the appropriate direction.
The lever engages in the turn signal
position.460de085

Front fog lamps

A green indicator lamp appears
in the instrument cluster to
indicate that the front fog lamps
are on.
460us038

The illustration provides an example of
the interior lamps when equipped with
reading lamps.
The interior lamps operate automati-
cally.

To switch the interior lamps on
and off manually

Press the button briefly.
If you want the interior lamps to remain
off all the time, press and hold the
button for approximately 3 seconds.
To revert to normal operation, press the
button briefly.

Footwell lamps

*
The footwell lamps operate in the same
way as the interior lamp.460de039

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IndexDataTechnologyRepairsCar careControlsOverview
Air conditioner1 Air onto the windshield and onto the
side windows
2 Air for the upper body area
The side rotary dials allow you to
open and close the air supply through
an infinitely-variable range, while the
levers change the air flow direction.
The center rotary dial controls the
temperature of the air as it flows out.
Refer to page 94
3 Air for the front footwell
There are also vent outlets for the
footwell in the rear as well
4 Air supply
Heating and ventilationd are available
starting with position 1. Refer to
page 94
5 Temperature94
6 Air distribution toward
>the windows
>the upper body
>the footwell
You can also make all intermediate
settings. Refer to page 94
7 Rear window defroster94
8 Air conditioner94
9 Recirculated-air mode94

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IndexDataTechnologyRepairsCar careControlsOverview
Air conditioner Draft-free ventilation You can adjust the blower controls for
the upper body area to select the
optimum airflow rates and directions for
your personal requirements:
Use rotary dials 1 to open and close the
air outlets through an infinitely-variable
range. You can adjust the direction of
the airflow with rotary dial 2.
Set the outlets so that the air flows past
you and is not directed straight at you.
Rotary dial 3 allows you to mix the air
from the outlets for your upper body by
warming or cooling the air as desired.460de040
Microfilter An activated-charcoal microfilter, which
traps incoming dust and pollen, has
been installed in your vehicle. Your
BMW center will replace it during regu-
larly scheduled maintenance. A
substantial reduction in air supply indi-
cates that the filter must be replaced
before normal maintenance.
For additional details on the filter
change, refer to page 171.
Rapid ventilation1 Set the blower speed control for the
air flow rate to position 4
2 Switch on the air conditioner
3 Turn the rotary temperature control
completely to the left (blue)
4 Rotary control for air distribution in
position
5 Open the air outlets for the upper
body.463de018

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Air conditioner Rapid heating 1 Set the blower speed control for the
air flow rate to position 3
2 Turn the rotary temperature control
completely to the right (red)
3 Rotary control for air distribution in
position .463de019
Defrost the windshield and side
windows 1 Set the blower speed control for the
air flow rate to position 4
2 Turn the rotary temperature control
completely to the right (red)
3 Rotary control for air distribution in
position
4 Switch on the rear window defroster
to defrost the rear window. 463de020
HeatingWhen the windows are free of ice and
condensation, we recommend the
following settings:
1 Set the fan speed control for the air
flow rate to position 2
2 Use the rotary temperature control to
select an interior temperature which
is comfortable for you
3 Rotary control for air distribution in
position .390de127463de021

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IndexDataTechnologyRepairsCar careControlsOverview