brakes BMW 325Ci CONVERTIBLE 2001 E46 User Guide

188n
On vehicles with automatic transmis-
sion, the Adaptive Transmission Control
(ATC) uses a number of factors to
calculate the most efficient gear. 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.
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In order to include driving conditions in
its calculations, ATC registers curves
and both uphill and downhill grades.
For example, if you maintain speed
through a curve, the transmission does
not shift up. On uphill grades, it shifts
up only when the engine speed
increases in order to make more effi-
cient use of power reserves. On down-
hill grades, ATC shifts down when the
speed of the vehicle increases and the
driver must apply the brakes.
ATC
*

189n
IndexDataTechnologyRepairsCar careControlsOverview
Deceleration sensors continuously
monitor the acceleration forces acting
upon the vehicle. If, as the result of a
frontal collision, a deceleration is
reached at which the protection of the
safety belts alone is no longer
adequate, the gas generators of the
driver and passenger-front airbags are
ignited. However, the passenger-side
airbag is only triggered if an additional
sensor has recognized that the
passenger seat is occupied.
In the event of a side collision, the side
airbags in the front and/or rear
* are
triggered if necessary.
390de012
The airbags located under the marked
covers inflate and unfold in a matter of
a few milliseconds. In this process, they
tear through the designed separation
points of the upholstered covers or
press them out.
Because the inflation process must be
virtually instantaneous, it is accompa-
nied by a certain amount of ignition and
inflation noise, which will be drowned
out by the noise from the accident
itself. The gas required to inflate the
airbags is not dangerous, and the
associated smoke then dissipates.
The entire process is completed within
fractions of a second.Highly sensitive sensors monitor the
number of revolutions of the wheels.
When equipped with DSC, they also
monitor steering angle, lateral accelera-
tion, brake pressure and the movement
of the vehicle around its vertical axis.
If differences in the wheel speeds
occur, ASC+T counteracts the danger
of wheelspin by reducing engine
torque; if necessary, ASC+T will also
respond by applying the brakes to the
rear wheels.
In addition, DSC permanently monitors
the vehicle's current operating condi-
tion 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. Dangerous skids are
thus prevented before they can even
start, and all of this is possible, of
course, only within physically possible
limits. You may need some time to
become accustomed to the system's
intervention. However, it provides
optimum drive force and vehicle
stability. The braking intervention may
be accompanied by sounds specific to
the system.
Airbags ASC+T/DSC
*

Everything from A to Z
A
ABS (Antilock Brake System) 22,122
Accessories 6
Activated-charcoal filter 106,180
Adaptive Transmission Control (ATC) 73,188
Adding engine oil 145
Adding washer fluid 144,199
Adjusting backrest 52
Adjusting headrests 53
Adjusting the steering wheel 57
Adjusting the temperature 98,104
Adjusting thigh support 54
Air conditioner 96
Air distribution 98,104
Air nozzles 96,102
Air outlets 96,102
ventilation 96,102
Air pressure, tires 27,132
Air supply 98,105
Airbags 21,61 ,159 ,189
sitting properly with 62
Alarm system 42
Antenna 129
Antenna, Diversity 190 Antifreeze
147
radiator 127
Antilock Brake System (ABS) 22,122
Anti-theft alarm system 42
Aquaplaning 121,132
Armrest 110
ASC+T (Automatic Stability Control plus
Traction) 22,88
Ashtray front 111
rear 112
ATC (Adaptive Transmission Control) 73,188
Attach vacuum cleaner 112
AUC (Automatic recirculated-air
control) 105
Automatic car washes 151
Automatic climate control 102
remove window
condensation 105
Automatic cruise control 79
Automatic dimming, interior rearview mirror 58
Automatic recirculated-air control (AUC) 105
Automatic Stability Control plus Traction
(ASC+T) 22,88 Automatic transmission with
Steptronic 21,73
Automatic windshield washer 77
Average consumption 85
Average speed 86
Avoiding unwanted alarm 43
Axle loads 198
B
Backrest adjusting 52
locking 21,55
releasing 55
Backup lamps 72
bulb replacement 169
Battery 176,200
capacity 200
charge current 20,176
charging 178
discharged 183
removal and
installation 178
Belts 60
Beverage holder 111
Blower 98,105
BMW High Performance Synthetic Oils 146
BMW Maintenance System 150 BMW sports seat
54
Bore 196
Brake fluid 148
Brake hydraulic system 20
Brake lamps, bulb replacement 169
Brake pads 22,126
Brake system 126
Brakes 125
malfunctions 126
Break-in procedures 120
Bulb replacement 166
C
California Proposition 65 Warning 161
Capacities 199
Car Memory 59
Car radio 129
reception 129,190
refer also to the Radio
Owner's Manual
Car washes 151
Care convertible top 157
exterior 152
interior 154
leather upholstery 155
rubber seals and
components 127

Everything from A to Z
205n
IndexDataTechnologyRepairsCar careControlsOverview
upholstery155
vinyl upholstery154
wool velour155
Cargo
loading114
securing114
Caring for the vehicle's
finish153
Cassette operation, refer
also to the Radio Owner's
Manual
Catalytic converter121
CBC (Cornering Brake
Control)21,123
CD operation, refer also to
the Radio Owner's Manual
Cellular phone111,129
refer to also the separate
Owner's Manual
Center (high-mount) brake
lamp171
Center armrest110
Central locking system34
button38
Changing a tire173
Changing a wheel173
Check Control83
Child restraints64
Child restraint
systems61,64
Child seat security65
Child's seat61,64
Cigarette lighter112 Cleaning headlamps78
Cleaning windshield77
Clock84
Cockpit16
Code, refer to the radio
Owner's Manual
Coin box, cup holder111
Combination switch76
Compression196
Computer83
refer also to the separate
Owner's Manual
Configure settings59
Consumption85
Contents10
Convertible top45
cleaning and care157
closing following an
electrical malfunction181
compartment panel41
convenience operation34
electrical fault181
emergency closure181
Coolant127,147,199
antifreeze127
Cooling system199
Copyright4
Cornering Brake Control
(CBC)21,123
Cruise control79
Cruising range85
Curb weight198
Current check indicator20
D
Data
dimensions197
engine196
technical196
weights198
Daytime-driving lamp
switch93
DBC (Dynamic Brake
Control)124
Deep water121
Defrost setting100,105
Defrostable rear
window98,106
Defrosting the
windows100,105
Digital clock84
Dimensions197
Dipstick145
Disc brakes125
Displacement196
Display lighting93
Displays18
Disposal
batteries178
engine oil147
Distance warning87
Diversity Antenna190
Door key32
Door locks, care127 Doors
emergency operation34
remote control35
unlocking and locking34
DOT Quality Grades133
Draft-free
ventilation99,106
Drive belts200
Driving hints121
Driving in winter127
Driving lamps93
DSC (Dynamic Stability
Control)22,88,189
Dynamic Brake Control
(DBC)124
Dynamic Stability Control
(DSC)22,88,189
E
Electric power windows44
Electrical accessories,
failure179
Electrical system200
Electronic vehicle
immobilizer33
Elements of operation16
Emergency closure181
Emergency operation
convertible top181
doors34
fuel filler door180
Energy Control81

Owner service procedures
A
Activated-charcoal filter 180
Adding brake fluid 148
Adding engine coolant 148
Adding engine oil 145
Air pressure, checking 27
Antifreeze 147
Avoiding unwanted alarm 43
B
Backup lamps, bulb replacement 169
Battery add distilled water 177
charging 178
Brake faults 126
Brake fluid, adding 148
Brake lamps, bulb replacement 169
Brakes, brake faults 126
C
Changing a tire 173
Changing a wheel 173
Changing the
microfilter 180 Checking air pressure
27
Checking engine oil level 145
D
Defrost setting 100,105
Defrosting the windows 100,105
Difficult steering 129
Doors, emergency actuation 34
E
Electrical accessories, failure 179
Emergency operation convertible top 181
doors 34
fuel filler door 180
Engine coolant, adding 148
Engine oil add 145
level checking 145
quality 146
specifications 146
viscosity 146
Eyelets, towing 184
F
False alarm, avoiding 43
First-aid kit 25
Flat tire 173
Fog lamps, bulb replacement 169
Footwell lamps, bulb replacement 172
Fuel filler door manual release after
electrical fault 180
Fuses, replacing 179
G
Glove compartment lamp, bulb replacement 172
H
Hazard warning flashers 25
Hazard warning triangle 25
Headlamp cover, care 167
High beam headlamps, bulb replacement 167
Hood release 140
I
Indicator lamps 20
Inflation pressures 27,132 Interior lamps, bulb
replacement 171
Interior motion sensor, switching off 43
J
Jack 173
L
License plate lamp, bulb replacement 171
Low beam headlamps, bulb replacement 167
Luggage compartment emergency release 39
Luggage compartment lamps, bulb
replacement 172
Luggage compartment lid emergency release 39
M
Maintenance 150
Microfilter, changing 180
Motion sensor, switching off 43