2010 BMW 3 SERIES ECU

Technology for driving comfort and safety
82 can drown out the PDC signal. Therefore,
always drive cautiously; otherwise, there is a
risk of personal injury or property damage.<
Driving stability control
systems
Your BMW has a number of systems that help
to maintain the vehicle's stability even in
adverse driving conditions.
Antilock Brake System ABS
ABS prevents locking of the wheels during
braking. Safe steering response is maintained
even during full braking. Active safety is thus
increased.
The ABS is operational every time you start the
engine. Braking safely, refer to page118.
Electronic brake-force distribution
EBV
The system controls the brake pressure in the
rear wheels to ensure stable braking behavior.
Dynamic Brake Control DBC
When you apply the brakes rapidly, this system
automatically produces the maximum braking
force boost and thus helps to achieve the short-
est possible braking distance during full brak-
ing. This system exploits all of the benefits pro-
vided by ABS.
Do not reduce the pressure on the brake for the
duration of the full braking application.
Dynamic Stability Control DSC
DSC prevents the driving wheels from losing
traction when you pull away from rest or accel-
erate. The system also recognizes unstable
driving conditions, for example if the rear of the
car is about to swerve or if momentum is acting
at an angle past the front wheels. In these
cases, DSC helps the vehicle maintain a safe
course within physical limits by reducing engine
output and through braking actions at the indi-
vidual wheels.The laws of physics cannot be repealed,
even with DSC. An appropriate driving
style always remains the responsibility of the
driver. Therefore, do not reduce the additional
safety margin again by taking risks, as this could
result in an accident.<
Deactivating DSC
Press the button for at least 3 seconds; the indi-
cator lamps for DSC in the instrument cluster
light up. Dynamic Traction Control DTC and
DSC have been simultaneously deactivated.
Stabilizing and drive-output promoting actions
are no longer executed.
In the same way as with a differential interlock
*,
even if DSC is deactivated, brake actions are
still performed to enhance drive output if the
drive wheels experience a significant loss of
traction.
To increase vehicle stability, activate DSC again
as soon as possible.
Activating DSC
Press the button again; the indicator lamps in
the instrument cluster go out.
For better control
If the indicator lamp flashes:
DSC is regulating the drive and brak-
ing forces.
If the indicator lamps are on:
DSC is deactivated.
Dynamic Traction Control DTC
DTC is a version of DSC in which the drive out-
put is optimized for particular road conditions,

Technology for driving comfort and safety
90
Airbags
The following airbags are located under the
marked covers:
1Front airbags
2Head airbags
3Side airbags in the seat backrests
Protective action
Observe the adjustment instructions on
page41 to ensure the best possible per-
sonal protection.<
The front airbags help protect the driver and
front passenger by responding to frontal
impacts in which safety belts alone cannot pro-
vide adequate restraint. When needed, the
head and side airbags help provide protection in
the event of side impact. The relevant side air-
bag supports the side upper body area. The
head air bag supports the head.
The airbags have been designed to not be trig-
gered in every collision situation, e.g. not in
minor accidents or rear-end collisions.
Do not apply adhesive materials to the
cover panels of the airbags, cover them or
modify them in any other way.
Keep the dashboard and windows on the front
passenger side clear, i.e. do not cover with
adhesive labels or coverings, and do not attach
holders such as for navigation instruments or
mobile phones.
Do not attach seat covers, cushions or other
objects not specifically approved for seats with
integral side airbags to the front seats. Do not
hang items of clothing such as coats or jackets
over the backrests. Do not attempt to remove the airbag retention system from the vehicle. Do
not modify the individual components of the
system or its wiring in any way. This includes
the upholstered covers on the steering wheel,
instrument panel, seats and roof posts, as well
as the sides of the roof lining. Do not attempt to
remove or dismantle the steering wheel.
Do not touch the individual components imme-
diately after the system has been triggered,
because there is a danger of burns.
In the event of malfunctions, deactivation or
triggering of the airbag restraint system, have
the testing, repair, removal and disposal of air-
bag generators executed only by a BMW center
or a workshop that works according to repair
procedures of BMW with correspondingly
trained personnel and that has the required
explosives licenses. Unprofessional attempts to
work on the system could lead to failure in an
emergency or to undesired airbag activation,
either of which could result in personal injury.<
Warning notices and information about the air-
bags can also be found on the sun visors.
Automatic deactivation of the front
passenger airbags
An analysis of the impression in the front pas-
senger seat cushion determines whether and
how the seat is occupied. The front and side air-
bags for the front passenger are activated or
deactivated by the system accordingly.
The indicator lamp above the interior
rearview mirror shows the current status
of the front passenger airbags, deactivated or

Practical interior accessories
110 The lashing eyes in the cargo area provide you
with a way to attach cargo area nets
* or draw
straps for securing suitcases and luggage, refer
to page120.
Sports Wagon:
Cargo area
Roller cover
Pull out the cover and hook it into the retaining
fixtures.
Do not place objects on the cover; other-
wise, they could endanger the car's occu-
pants, e.g. in the case of braking or sudden
swerving.
Do not let the cover retract; otherwise, it could
be damaged.<
Raising the roller cover
Press the button: the roller cover is raised.
Before closing the rear window or tailgate,
press the roller cover downward until it
engages.
Expanding the cargo area
The rear seat backrest is divided. You can fold
down either division in order to expand the
cargo area.
Reach into the recess and pull forwards.
When folding the backrest back up, make
sure that the catch engages properly. If
you cannot see a red warning area in the recess,
the catch is properly engaged. Otherwise,
cargo can be thrown around inside the passen-
ger compartment and endanger the car's occu-
pants, e.g. in the case of braking or sudden
swerving.<
Observe the instructions concerning the
safety belt on page41 to ensure the best
possible personal protection.<

Controls
111Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Partition net
Do not let the partition net retract; other-
wise, there is a risk of danger and the par-
tition net could be damaged.<
Use the loop strap to pull the partition net out of
the casing. Grip the bar on both ends and insert
it into the retaining fixtures, arrow 1. This can
best be done from the rear seat.
When you no longer require the partition net,
grip both ends of the bar and take it out of the
retaining fixtures, arrow 2. Let the partition net
slide into the casing slowly.
With cargo area expanded
1.Fold down both rear seat backrests, refer to
Expanding the cargo area.
2.Use the buttons to unlatch the casing on
both sides, arrow 1.3.Pull the casing out backwards, arrow 2,
without tilting it.
4.Slide the casing into the guides on the
backs of the seat backrests.
5.Carefully pull out the partition net and insert
it into the front retaining fixtures, refer to
Partition net above. This can best be done
from the front seat.
Follow the same steps in reverse order to return
the partition net and seats to their original posi-
tions. Finally, slide the casing into both retaining
fixtures on the sides until it engages. Tug on the
casing to check if it is properly locked in place.
Storage compartments inside
the cargo area
Sedan
Depending on your vehicle's equipment, the
following storage spaces can be found in the
cargo area:
>Left storage compartment, e.g. for storing a
box of cleaning tissues or up to 12 CD jack-
ets, depending on vehicle equipment ver-
sion
>Net
* for securing smaller objects, to be
attached to the fixtures on the floor panel
>Hooks for hanging up, e.g., shopping bags
or tote bags
>Rubber strap on the left trim panel for
securing small objects such as a folding
umbrella
>Net for small objects on the right trim panel
of the cargo area

Practical interior accessories
112 >Folding, removable box
* under the floor
panel, e.g. for wet or dirty items
>Stowage compartment under the floor
panel
>Insertable dividers
* and removable storage
tray for the storage compartment under the
floor panel
Sports Wagon
The following storage spaces can be found in
the cargo area:
>Umbrella holder
* on the bottom of the par-
tition net casing
>Rubber strap on the left
* and right trim
panel for securing small objects such as a
folding umbrella
>Hooks for hanging up shopping bags or tote
bags, for example, on the left and right sides
of the cargo area
>Net for small objects on the right trim panel
of the cargo area
>Stowage compartment under the floor
panel
Depending on your vehicle's equipment, other
storage spaces can be found in the cargo area:
>Net
* for securing smaller objects, to be
attached to the fixtures on the floor panel
>Net
* on the left side trim of the cargo area
instead of the rubber strap
>Reversible floor panel with integrated plas-
tic cover
* for cargo area or bumper
>Folding, removable box
* under the floor
panel, e.g. for wet or dirty items>Insertable dividers
* and removable storage
tray for the storage compartment under the
floor panel
Folding up the floor panel
Do not exceed the maximum permissible
load of 55 lbs/25 kg for the storage com-
partment under the floor panel; otherwise, dam-
age could result.<
Sedan
Press the floor panel against the ceiling of the
cargo area; a locking device holds the floor
panel in place. To detach the floor panel, pull it
out of the locking device.
Sports Wagon
Fold up the floor panel and take it out or lean it
forward.
Lashing eyes
You will find lashing eyelets in the cargo area for
securing luggage items with nets or tensioning
straps, refer to page120.
Ski bag*
The ski bag is designed for safe, clean transport
of up to 4 pairs of standard skis or up to
2snowboards.
With the ski bag you can stow skis with a length
of up to 6 ft 10 in/2.10 m. When skis of 6 ft 10 in/
2.10 m length are loaded, the overall capacity of
the ski bag is reduced due to its tapered design.

Controls
113Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Loading
1.Fold down the center armrest.
2.Press the button, reach into the recess and
fold down the cover.
3.Open the Velcro fastener, spread the ski
bag between the front seats and insert the
skis or snowboards.
The zip fastener makes objects in the ski
bag easier to reach.
4.Insert the latch plate of the ski bag's retain-
ing strap in the center belt buckle.
Only place clean skis in the ski bag. Wrap sharp
edges to prevent damage.
Securing cargo
After loading, secure the ski bag and its con-
tents. Tighten the retaining strap on the ten-
sioning buckle for this purpose.Secure the ski bag in the manner
described; otherwise, it could endanger
the car's occupants, e.g. in case of heavy brak-
ing or sudden swerving.<
To store the ski bag, perform the steps
described for loading in reverse order.
Removing the ski bag
The ski bag can be completely removed, e.g. for
faster drying or to allow you to use other inserts.
1.Fold down the center panel in the rear seat
backrest.
2.Pull the handle, arrow1.
3.Pull out the insert, arrow 2.
For more information on the various
inserts available, contact your BMW cen-
ter.<

Driving tips
119Reference
At a glance
Controls
Communications
Navigation
Entertainment
Mobility
When the vehicle is parked
Condensation forms while the automatic cli-
mate control is in operation, and then exits
under the vehicle. Traces of condensed water
under the vehicle are therefore normal.
Cargo loading
To avoid loading the tires beyond their
approved carrying capacity, never over-
load the vehicle. Overloading can lead to over-
heating and increases the rate at which damage
develops inside the tires. This can ultimately
result in a sudden blowout.<
Make sure that no liquids are spilled or
leak from their containers in the cargo
area, as this could result in damage to the vehi-
cle.<
Determining loading limit
1.Locate the following statement on your
vehicle's placard
*:
The combined weight of occupants
and cargo should never exceed
XXX kg or YYY lbs. Otherwise, overloading
can result in damage to the vehicle and
unstable driving conditions.<
2.Determine the combined weight of the
driver and passengers that will be riding in
your vehicle.
3.Subtract the combined weight of the driver
and passengers from XXX kilograms or YYY
pounds.
4.The resulting figure equals the available
amount of cargo and luggage load capacity.
For example, if the YYY amount equals 1,400 lbs. and there will be five 150-lb. pas-
sengers in your vehicle, the amount of avail-
able cargo and luggage load capacity is
650 lbs:
1,400 lbs. minus 750 lbs. = 650 lbs.
5.Determine the combined weight of luggage
and cargo being loaded on the vehicle. That
weight may not safely exceed the available
cargo and luggage load capacity calculated
in step 4.
6.If your vehicle will be towing a trailer, part of
the load from your trailer will be transferred
to your vehicle. Consult the manual for
transporting a trailer to determine how this
may reduce the available cargo and luggage
load capacity of your vehicle.
Load
The permissible load is the total of the weight of
occupants and cargo/luggage. The greater the
weight of the occupants, the less cargo/lug-
gage can be transported.
Stowing cargo
>Position heavy objects as low and as far for-
ward as possible, ideally directly behind the
respective seat backrests.
>Cover sharp edges and corners.
>For very heavy cargo when the rear seat is
not occupied, secure each safety belt in the
opposite buckle.

Things to remember when driving
120
Sedan
Sports Wagon
>Use the partition net to protect passengers,
refer to page111. Make sure that objects
cannot penetrate the partition net.
>Do not stack cargo higher than the upper
edge of the backrests.
>Place protective material around any
objects which could bump against the rear
window while the vehicle is in motion.
Securing cargo
>Secure smaller and lighter items using
retaining straps, a cargo area net
* or draw
straps
*.
>Heavy-duty cargo straps
* for securing
larger and heavier objects are available at
your BMW center. Four
* lashing eyes are provided for attaching the cargo straps.
Two are located on the cargo area
sidewalls1, two more are on the rear cargo
area panel2.
Please comply with the information sup-
plied with the cargo straps.
Always position and secure the cargo as
described above, so that it cannot endan-
ger the car's occupants, for example if sudden
braking or swerving is necessary.
Never exceed either the approved gross vehicle
weight or either of the approved axle loads, refer
to page247, as excessive loads can pose a
safety hazard, and may also place you in viola-
tion of traffic safety laws.
Heavy or hard objects should not be carried
loose inside the car, since they could be thrown
around, for example as a result of heavy braking,
sudden swerves, etc., and endanger the occu-
pants.
Only attach the cargo straps using the lashing
eyes shown in the illustration. Do not secure
cargo with the anchors for tether straps, refer to
page51; otherwise, these could be damaged.<
Roof-mounted luggage rack*
A special rack system is available as an option
f o r y o u r B M W . C o m p l y w i t h t h e d i r e c t i o n s g i v e n
in the installation instructions.
Mounting points
The mounting points are located in the roof/
along the roof rails
*.