transmission BMW 325I 2001 Owner's Manual

173n
IndexDataTechnologyRepairsCar careControlsOverview
On vehicles with an automatic trans-
mission, the Adaptive Transmission
Control (ATC) uses a number of factors
to calculate the gear which provides
maximum efficiency. In this process, it
considers your individual driving style
as well as current driving conditions.
ATC recognizes your personal driving
style from the positions and movements
of the accelerator pedal, deceleration
when braking, and lateral acceleration
through curves. Based on different shift
characteristics Ð from comfort-oriented
to performance-oriented Ð ATC will
select the appropriate gear.463us005
In order to include driving conditions in
its calculations, ATC registers curves
and both uphill and downhill gradients.
For example, if you maintain speed
through a curve, the transmission does
not shift up. On uphill gradients, it shifts
up only when the engine speed
increases in order to make more effi-
cient use of power reserves. On down-
hill gradients, ATC shifts down when
the speed of the vehicle increases and
the driver must apply the brakes.Highly sensitive sensors monitor the
number of revolutions of the wheels,
steering angle, lateral acceleration,
brake pressure and the movement of
the vehicle around its vertical axis.
If differences in the wheel speeds
occur, ASC+T recognizes the danger of
wheelspin and reduces torque. If
necessary, the system also responds
with additional brake applications at the
rear wheels.
In addition, DSC permanently monitors
the vehicle's current operating condition
and compares it with an ideal condition
that is calculated from the sensor's
signals. If deviations from this occur
(understeering or oversteering, for
instance), DSC can stabilize the vehicle
in fractions of a second by reducing
engine output and with the assistance of
braking intervention at individual
wheels. As a result, dangerous skids can
be prevented even as they are just
beginning.
You may need some time to become
accustomed to this system's interven-
tion. However, it provides optimum drive
force and vehicle stability.
The braking intervention may be
accompanied by sounds specific to the
system.
ATC
*
ASC+T/DSC
*

174n
Radio receptionThe AM frequency bands (medium-
wave, long-wave and short-wave) make
it possible to receive stations from a
great distance, because the broadcast
signals travel not only along the ground
as surface waves, but also as atmo-
spheric waves that are reflected from
the ionosphere.
Frequency-modulation (FM) provides
substantially better sound quality than
the other frequencies. However,
because FM transmissions rely on line-
of-sight broadcast waves, their effec-
tive reception range is limited. 360de084
The limitations inherent to radio recep-
tion in a moving vehicle have been
minimized by a number of innovative
system designs:
The Radio Data System (RDS) makes
sure that, for broadcast stations trans-
mitting on several frequencies, the
radio automatically tunes to the
frequency with the best reception
quality.
The Diversity Antenna system employs
several FM antennas integrated within
the rear window to provide three sepa-
rate sources for receiving broadcast
waves. An integral processor automati-
cally selects the antenna with the best
FM reception quality at any given time.
The selection of the antenna takes place
within milliseconds, and is therefore not
noticed by the radio listener.

175n
IndexDataTechnologyRepairsCar careControlsOverview
Four-wheel drive Safety belt tensionerThe transmission of power to the four
drive wheels is provided permanently
through a transfer box. The distribution
of torque between the front and rear
axles is 38% to 62%.
Traditional differential locks at the front
and rear axles and in the transfer box
are not required. Their function is
assumed by automatic braking inter-
vention at all four wheels. These trac-
tion interventions are governed by
Automatic Differential Brake (ADB-X), a
sub-function of DSC.
If a wheel tends to slip, it is braked
automatically by ADB-X until it once
again gains traction, and drive force
can be transmitted to that wheel. In
addition, the drive force is distributed to
the remaining wheels during this 530us133
system intervention. Engine output is
also reduced if necessary.
When the DSC is deactivated, the
ADB-X traction intervention is set for
the maximum drive force. However, the
engine intervention and the stability
controls are no longer available. For
this reason, DSC should only be deacti-
vated in the exceptional circumstances
described on page 81.
The BMW 325xi is not an off-road
vehicle. Instead, permanent four-wheel
drive provides a high degree of vehicle
stability and tractive ability under all
road conditions, and will aid you in crit-
ical driving situations, e. g. driving in
extreme winter conditions or on loose
road surfaces.The safety belt tensioner responds to
severe frontal collisions by tightening
the belts to ensure that occupants
remain firmly positioned in their seats.
A gas-pressure system retracts the
buckle assembly to tension the
shoulder and lap belts within fractions
of a second. This reduces the tendency
to slide under the lap belt.
390de330

178n
Tire Pressure Control (RDC)
*
This system regularly checks tire pres-
sure and monitors all four tires even
while driving, so you do not have to.
Behind the valve stem in every wheel,
there is an electronic chip which is
designed for severe-duty applications
and long service life. It contains a pres-
sure sensor, a transmitter and a battery.
The pressure is measured in extremely
short time intervals and then transmitted
by a radio signal. If an irregularity is
detected, the transmission rate is
increased. 463de006
There is an antenna located right near
every wheel in the vehicle body. This
antenna picks up signals from its
respective wheel. A central electronics
system evaluates the quadruple signals
which it receives and forwards any
changes.
The RDC provides an important contri-
bution to driving safety.

186n
Weights
BMW 325i BMW 325xi
Curb weight (with one person, ready for operation, full tank of fuel, options not included)
with manual transmission
with automatic transmissionlb. (kg)
lb. (kg)3,384 (1,535)
3,428 (1,555)3,627 (1,645)
3,693 (1,675)
Approved gross vehicle weight
with manual transmission
with automatic transmissionlb. (kg)
lb. (kg)4,531 (2,055)
4,576 (2,075)4,729 (2,145)
4,795 (2,175)
Approved front axle weight lb. (kg) 2,006 (910) 2,183 (990)
Approved rear axle weight lb. (kg) 2,579 (1,170) 2,668 (1,210)
Approved roof load capacity lb. (kg) 165 (75) 165 (75)
Luggage compartment capacity cu. ft. (liters) 15.4 - 47.5 (435 - 1,345) 15.4 - 47.5 (435 - 1,345)
Approved axle loads and approved gross vehicle weight may not be exceeded.

187n
IndexDataTechnologyRepairsCar careControlsOverview
Capacities
Notes
Fuel tank
reserve gal. (liters)
gal. (liters)approx. 16.6 (approx. 63)
approx. 2.1 (approx. 8)Fuel specification: page 28
Windshield washer system/
Headlamp washer system (front)
Rear window washer system (rear)quarts (liters)
quarts (liters)approx. 5.6 (approx. 5.3)
approx. 2.4 (approx. 2.3)For details: page 134
Cooling system including heater circuit quarts (liters) approx. 8.9 (approx. 8.4) For details: page 137
Engine oil filter change quarts (liters) 325i approx. 6.9
(approx. 6.5)
325xi: approx. 7.9
(approx. 7.5)BMW High Performance
synthetic oil
Specifications: page 136
Manual and automatic transmission and
differentialÐ Lifetime fluid, no fluid change
required

Everything from A to ZA
ABS (Antilock Brake
System)22,116
Accessories6
Activated-charcoal
filter100,165
Adaptive Transmission
Control (ATC)65,173
Adding engine oil135
Adding washer
fluid134,187
Adjust
backrest47
steering wheel50
temperature92
thigh support area48
Air conditioner90
Air distribution92,98
Air nozzles90
Air outlets96
ventilation90,96
Air pressure124
Air supply92,99
Airbags21,58,147,172
Alarm system41
Antenna123
Antenna Diversity174
Antifreeze137
radiator121
Antilock Brake System
(ABS)22,116
Anti-theft alarm system41
Aquaplaning115,124 Armrest102
ASC+T (Automatic Stability
Control plus
Traction)22,173
Ashtray104
ATC (Adaptive Transmission
Control)65,173
Attaching vacuum
cleaner104
AUC (Automatic climate
control)96
Automatic car washes141
Automatic climate
control96
remove condensation from
the windows98
Automatic cruise control71
Automatic dimming, interior
rearview mirror52
Automatic Stability Control
plus Traction
(ASC+T)22,173
Automatic transmission21
Automatic transmission with
Steptronic65
Automatic washer
rear window69
windshield69
Average consumption77
Average speed77
Axle loads186
B
Backrest, adjusting47
Backup lamps64
bulb replacement156
Battery162,188
capacity188
charging164
discharged167
removal and
installation163
Battery charge current20
Battery safety terminal163
Belts53
Beverage holder102
Blower92,99
BMW High Performance
Synthetic Oils136
BMW sports seat48
Bore184
Brake
fluid138
hydraulic system20
pads22
Brake lamps
bulb replacement156
Brake system118
faults120
Break-in procedure114
Bulb replacement153
Bulbs and lamps153
C
California Proposition
65 Warning148
Capacities187
Car Memory52
Car radio123
reception174
refer also to the separate
Owner's Manual
Car telephone103
Car vacuum cleaner,
connecting104
Car wash141
Care
upholstery145
vehicle exterior142
vehicle finish143
vehicle interior144
wool velour145
Cargo loading110
Catalytic converter115
CBC (Cornering Brake
Control)21,117
Cellular phone123
refer to the separate
Owner's Manual
Center armrest102
Center (high-mount) brake
lamp157
Central locking system34
button38
Changing a tire159

Everything from A to Z
195n
IndexDataTechnologyRepairsCar careControlsOverview
Luggage
compartment38,107
capacity186
emergency release166
lamps39
lamps, bulb
replacement158
remote control system37
trunk floor40
Luggage compartment lid
emergency release166
Luggage rack111
Lumbar support48 M
Maintenance74
Malfunction displays75
Manual transmission64
Memory49
MFL (Multifunction steering
wheel)24
Microfilter93,165
Mirror memory49
Mirrors51
Mobile phone123
Modifications,
technical6,148
Motion sensor, interior41
Multifunction steering wheel
(MFL)24
M+S tires128
N
Neckrest47
Nozzles96 O
OBD interface socket149
Obstruction protection43
Odometer73
Oil
additives135
capacity187
consumption135
dipstick135
quality136
specifications136
viscosity136
Oil change intervals, refer to
the Service and Warranty
Information Booklet or to
the Warranty and Service
Guide Booklet
Oil filter change187
Oil level, indicator lamp20
Oil pressure, indicator
lamp20
OILSERVICE74
Onboard computer, please
refer to Computer76
Onboard tool kit152
Opening and closing
from the inside38
from the outside34 Opening the rear
window40
Outside temperature
display76
Owner service
procedure141
P
Paint blemishes142
Paintwork
minor repairs143
waxing143
Paint, care142
Park Distance Control
(PDC)78
Parking brake63
Parking help78
Parking lamps88
Parking, winter122
Partition net107
PDC (Park Distance
Control)78
Performance184
Phone, mobile123
Pocket lamp101
Pollen93,100
Power outlet105
Power steering123
Power windows43
safety switch44
Pressure monitoring,
tires85,178
Pressure, tires28,124
Q
Quality Grades125 R
Radiator187
Radio
refer to the separate
Owner's Manual
Radio Data System
(RDS)174
Radio reception123,174
Rain sensor69,177
RDC (Tire Pressure
Control)85,178
RDS (Radio Data
System)174
Reading lamps88
Rear backrest, folded
down108
Rear hatch lamp
bulb replacement157
Rear lamps156
Rear seat backrest,
folding107
Rear window
defroster70,92,99
Rearview mirror51
Recirculated air control92
automatic99
Recirculated-air mode92
Reclining seat46
Refueling27

Everything from A to ZRemote control35
Removal from service of the
vehicle147
Removing condensation
from the windows94
Reporting safety defects7
Restraint system54
Retaining straps40
Reverse17,64
Roll-up cover107
Roof load capacity186
Roof luggage rack111
Rubber parts121 S
Safety belt height
adjustment53
Safety belt tensioners175
Safety belts53
height adjustment53
Safety defects, reporting7
Safety feature43
Safety lock buttons38
Seat
electric power48
mechanical46
Seat adjustment46
Seat heating100
Seat memory49
Securing cargo110
Securing loads110 Selector lever, automatic
transmission65
Self-defrosting mirrors51
Self-diagnostics179
Service and Warranty
Information Booklet
(US models)140
Service Interval Display74
Setting the temperature98
Shiftlock65
Side airbags58
Side impact Head Protection
System58
Side lamps87
bulb replacement154
Ski bag106
Skid control122
Sliding/tilt sunroof44
close in the event of an
electrical short166
convenience operation34
Slippery roads122
Snow chains121
Socket104
for electrical
appliances104
for flashlights104
for vacuum cleaner104
refer also to power
outlet105
Space-saver spare tire159 Spare key32,35
with radio remote
control32,35
Spare tire159
Spark plugs188
Speaker103
Speed control71
Speedometer18
Sports seat48
Sports steering wheel25
Starting assistance167
Starting
problems115,167
Starting the engine61
Steel wheels129
Steering123
Steering wheel lock61
Steering wheel,
adjusting50
Steptronic65
Stereo system Ð harman
kardon101
Stopping the vehicle62
Storage compartments102
Storing the vehicle147
Stroke184
Summer tires127
Sun visors51
Sunroof44
Switching off the engine62
Symbols4,163 Synthetic oils136
T
Tachometer73
Tail lamps156
bulb replacement156
Tailgate
emergency release166
Tailgate lamp, bulb
replacement157
Tank capacity187
Technical data184
Technical
modifications6,148
Telephone
refer to the separate
Owner's Manual
Telephone hookup103
Temperature adjustment98
Temperature display,
outside temperature76
Temperature gauge, engine
coolant74
Temperature
layering93,100
Thigh support area,
adjusting48
Third brake lamp157
Tilt alarm42
Tilt sensor alarm system36
remote control36
Tire changing159

Everything from A to Z
197n
IndexDataTechnologyRepairsCar careControlsOverview
Tire codes127
Tire damages124
Tire inflation
pressure28,124
Tire Pressure Control
(RDC)85,178
Tire pressure
monitoring85,178
Tire Quality Grading125
Tire replacement125,126
Tire specifications129
Tire tread124
Tools152
Torque184
Tow fittings168
Tow starting168
Towing168
Track185
Traction Control System,
refer to DSC79
Transmission64
Transporting children
safely58
Tread depth, tires124
Trip odometer73
Trunk38
Turn signal
indicator23,68,154
bulb replacement154
Turning radius185
Two-way radios123
U
Uniform Tire Quality
Grading125
Used batteries164 V
Vacuum cleaner,
connecting104
Vanity mirror51
bulb replacement158
Vehicle battery162,188
Vehicle care
exterior142
interior144
Vehicle Identification
Number (VIN)139
Vehicle immobilizer33
Vehicle painting142
Vehicle removal from
service147
Vehicle storage147
Vehicle weight186
Ventilation90,93,96
draft-free93,100
Vinyl upholstery, care144
Voice recognition24,25 W

Warning lamps20
Warning messages75
Warranty and Service Guide
(Canadian models)140 Washer fluids134
Washer nozzles134
Washer reservoir, filling134
Washing your car141
Water on roadways
deep water115
Waxing, paintwork143
Weights186
Wheel changing159
Wheel lug wrench159
Wheel rims127
Wheel stud wrench159
Wheelbase185
Wheels and tires127,129
Width185
Windows, convenience
operation34
Windshield washer nozzle
adjustment134
Windshield washer reservoir,
filling134,187
Windshield wiper68
blade replacement152
Winter operation121
Winter tires127,128
Wiper blade
replacement152
Wiper system68
Work in the engine
compartment130
X
Xenon lamp154,180