2001 BMW M3 COUPE sensor

159n
IndexDataTechnologyRepairsCar careControlsOverview
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
sending 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 there-
fore not noticed by the radio listener. The primary goal in developing the
Dynamic Stability Control (DSC) for the
BMW M3 is to achieve the greatest
amount of safety while at the same time
getting the most pleasure out of perfor-
mance-oriented driving.
Using highly sensitive sensors, the DSC
monitors current operating conditions
for your vehicle as they relate to driving
stability and traction. In addition, wheel
speeds, steering angle, lateral acceler-
ation, brake pressure and vehicle
movement around its vertical axis are
also ascertained and evaluated.
If the DSC detects unstable conditions
on a curve, then the DSC will intervene
in engine management within millisec-
onds, reducing drive torque or, if the
need arises, will individually slow one or
more wheels down to keep the vehicle
on a steady course.
If differences in wheel speed should
occur, the system will recognize the
dangers associated with wheel spin
and will reduce the drive torque; if
necessary, it will do so using brake
intervention at the rear wheels as well.
DSC offers the highest degree of
driving stability and safety not only
when you first start your vehicle, are
driving on straightaways or when
braking, but also when driving through
curves.The safety belt tensioner makes sure
that the belt tightens during a head-on
collision 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. Radio reception DSC Safety belt tensioner

160n
M3 Engine concept Rain sensor
*
BMW M will continue to develop BMW
engines for the performance-oriented,
yet responsible driver. That is why value
is placed on an engine design that
guarantees maximum thrust over a
wide engine speed range.
This is done by using high-grade mate-
rials and components with optimized
details. The engine thereby produces
higher speeds than can be achieved
with conventional engines.
Associated with the proper transmis-
sion gear ratio and an especially perfor-
mance-oriented engine electronics
system, the torque opens up with this
so-called "high-speed aspirated
engine" extremely evenly throughout
the entire engine speed range from
1,000 to max. 8 ,000 rpm.
In actual usage, this means improved
acceleration and more spontaneous
response throughout the engine speed
range, thus affording more driving plea-
sure.
Depending on how wet the windshield
is, the rain sensor controls the opera-
tion of the windshield wipers.
Infrared light is carried along the
surface of the windshield in an optical
conductor in such a manner that it is
reflected completely when the wind-
shield is dry. The quantity of reflected
light is measured.
If there is moisture on the glass, the
amount of light reflected is reduced
since the infrared light at the surface of
the windshield can escape. The quan-
tity of reflected light is thus a means of
gauging the degree of wetness on the
windshield.

161n
IndexDataTechnologyRepairsCar careControlsOverview
Rain sensor
*
Interior rearview mirror, automatic dimming feature

When the "intermittent wiper" speed
position is selected, the wiper reacts
immediately if water is splashed onto
the windshield from vehicles traveling
ahead, for example. As a result, the rain
sensor contributes to driving safety and
comfort.
The interior rearview mirror with auto-
matic dimming feature reduces blinding
from following traffic by adapting the
intensity of the reflected images to
correspond to levels of light registered
by the unit's sensors. The mirror reverts
to its undimmed setting as soon as the
light source disappears. One lamp
sensor is mounted on the front of the
mirror housing. This sensor is directed
forward. It measures light intensity in the
area ahead of the vehicle. The second
sensor is integrated within the mirror's
glass. The electronic control system
compares the light intensity from front
and rear. The difference provides the
basic parameter used to modulate an
electrical current and induce chemical
changes in a semisolid layer incorpo-
rated in the mirror glass.
The semisolid reacts chemically to this
electrical current, thus providing infi-
nitely-variable dimming of the mirror
(electrochromic technology).
As a result, it is no longer necessary to
dim the mirror manually, and the driver
can concentrate completely on traffic
conditions.

Everything from A to Zhigh-speed aspirated
engine160
speed166
starting62t
torque166
Engine concept M3160
Engine oil
add123t
capacity169
consumption123
pressure20
temperature69
Entry to the rear47
Exterior mirrors49
Eyelets, towing155tFFailure messages72t
Fan87
Fault, ABS105
Filler cap cover25
Filling capacities169
Filling the washer
reservoir122t
First-aid kit24t
Flat tire111
repairing145
Fog lamps82
bulb replacement141t
Folding rear backrest95
Follow-Me-Home lamps81
Footbrake106Footwell lamps82
bulb replacement144t
Frost protection,
radiator125
Fuel26
consumption74
consumption display70
gauge70
preparation166
quality26
reserve indicator lamp70
Fuel filler door
manual release after
electrical fault152t
Fuel tank capacity169
Fuel tank gauge70
Functional status, electrical
and electronic
systems162
Fuses151
replacing151t
GGasoline26
Gasoline gauge70
Glove compartment90
Glove compartment lamp,
bulb replacement144t
Gross vehicle weight168
HHandbrake63
Handsfree system92
Hazard warning
flashers24t
Hazard warning triangle24
Head restraint46
Headlamp cleaning
system121, 122, 169
Headlamp cover,
care139t
Headlamp flasher82
Headlamp washer system,
refer to headlamp cleaning
system
Heated seats89
Heavy loads97
Height167
HiFi system Ð harman
kardon90
High beams65, 82
indicator lamp22
High engine speed160
High Performance Synthetic
Oil124
High-mount brake lamp143
Holder for beverages91
Hood release118t
Horn17
IIce warning73
Identification, tires114
Ignition key30
Ignition lock62
Imprint4
Indicator lamps20t
Individual settings52
Inflation
pressure26t, 111t
INSPECTION71
Instrument cluster18
Instrument lighting81
Instrument panel18
Interaxle tire rotation113t
Interface socket
for Onboard
Diagnostics135
Interference
cellular phone110
Interior lamps34, 82
bulb replacement143t
remote control34
Interior motion sensor40
Interior rearview mirror
automatic dimming
feature50, 161
Intermittent mode, wiper
system65

Everything from A to Z
177n
IndexDataTechnologyRepairsCar careControlsOverview
JJump-starting154KKey30
with remote control30
Key Memory52LLamps
fog lamps82
footwell lamps82
interior lamps82
reading lamps83
LAMPS ON warning81
Lashing eyes98
LATCH attachment of the
child seat60
Leather care132
Length167
License plate lamp, bulb
replacement143t
Light switch81
Light-alloy wheels116
Lighter93
Load-securing devices98
Louvers84
Low beam headlamps81
bulb replacement139tLuggage compartment37
capacity168
emergency release37t
floor mat39
floor panel39
lid37
lighting37
locking separately37
remote control34
Luggage compartment
lamps, bulb
replacement144t
Luggage rack98
Lumbar support48
MM Engine dynamics
control80
M Mobility system145
components146
using146
Maintenance71, 127t
Make-up mirror50
Malfunction displays72t
Manual transmission64
Manual-shift gear lever64
Master key30
Mechanical seat45
Memory51
MFL (Multifunction steering
wheel)23Microfilter/Activated-
charcoal filter88
changing152t
Mirror memory51
Mirrors49
automatic curb
monitor49
with automatic dimming
feature161
Mobile phone110
Modifications,
technical6, 134
Motion sensor, interior40
Multifunction steering wheel
(MFL)23
M+S radial tires115
NNavigation system, refer to
the separate Owner's
Manual
Neckrest46OOBD interface socket135
Obstruction protection42
Odometer69
Oil
additives123
capacity169
consumption123Oil change intervals, see the
Service and Warranty
Information Booklet (US
models)/Warranty and
Service Guide Booklet
(Canadian models)
Oil filter change169
Oil level, indicator lamp21
Oil pressure, indicator
lamp20
OILSERVICE71
Onboard computer, refer to
computer72
Onboard monitor, refer to
the separate Owner's
Manual
Onboard tool kit138t
Opening and closing
from inside36
via remote control33
via the door lock32
Outside temperature
display73
PPaint blemishes129
Paintwork
minor repairs130
waxing130
Paint, care129
Panic mode35

Everything from A to ZPark Distance Control
(PDC)75
Parking brake63
Parking help75
Parking lamp82
Parking, winter109
PDC (Park Distance
Control)75
Performance166
Phone hookup92
Phone, mobile110
Pollen88
Power seat47
Power windows42
Pressure specifications for
tires26
Pressure,
tires26, 26t, 111
Protective gloves141QQuality Grades112RRadiator169
Radio
please refer to the
separate Owner's Manual
reception110, 158
Radio Data System
(RDS)159
Rain sensor66, 160RDS (Radio Data
System)159
RDW (Tire Pressure
Warning)78
indicator lamp22
Reading lamps83
Rear backrest, folding95
Rear lamps141t
Rear window
defroster67, 88
Rear-entry assist47
Rearview mirror49
Recirculated air mode87
Reclining seat45
Refueling25
Remote control33
Removing condensation
from the windows87t
Repairing a flat tire145t
Replace windshield wiper
blades138t
Replacement key30t
Replacing bulbs138t
Reporting safety defects7
Restraint system55, 59
Return used
batteries151t
Reverse64
Roller blind, sun
protection89
Roof load capacity168Roof-mounted luggage
rack98
Rubber seals and
components108
SSafety belt tensioner159
Safety belts54
height adjustment55
three-point safety belt95
Safety buttons36
Safety defects, reporting7
Safety feature, electric
power windows42
Safety glasses141
Seat
mechanical45
power47
Seat adjusting45
Seat heating89
Seat memory51
Securing cargo97
Securing loads97
Self-defrosting mirrors49
Self-diagnostics162
Service and Warranty
Information Booklet127
Service Interval
Display71, 127
Service Manual127
Side airbags56Side impact Head Protection
System56
Side lamps81
Side marker lamp, bulb
replacement139t
Side turn signals, bulb
replacement140t
Ski bag96
Sliding/tilt sunroof43
closing after electrical
fault153t
convenience
operation32, 33
remote control33
Snow chains108, 115
Socket93
for flashlights93
for power supplies93
for vacuum cleaner93
Spare key30t
Spark plugs170
Speaker92
Speedometer18
Sport-mode,
identification80
Sports seat46, 47
Starting
problems63t, 103
Starting the engine62
Steel wheels116
Steering110
Steering lock62

Everything from A to Z
179n
IndexDataTechnologyRepairsCar careControlsOverview
Stopping the vehicle63
Storage areas91
Storing your vehicle133
Stroke166
Summer tires114
Sun roller blind89
Sun visors50
Surface ice warning73
Switching off the engine63
Switching off the interior
motion sensor41
Symbols, used4
Synthetic oils124TTachometer69
Tail lamps141
bulb replacement141t
Tank capacity169
Technical data166
Technical
modifications6, 134
Temperature display
outside temperature73
Temperature gauge
engine coolant70
Temperature layering88
Third brake lamp143
Through-loading system95
Tilt alarm34, 41
remote control34Tire codes114
Tire damage111t
Tire inflation
pressure26, 111
Tire Pressure Warning
(RDW)78
indicator lamp22
Tire Quality Grading112
Tire
replacement112, 113t
Tire specifications116
Tire tread111
Tools138t
Torque166
Towing eyelets155t
Towing the vehicle155t
Track167
Transmission64
Transporting children
safely59
Tread depth, tires111
Tread wear indicator111
Trip odometer69
Trunk, refer to luggage
compartment37
Turn signal indicator22, 65
bulb replacement140t
Turning radius167
Two-way radios110
UUniform Tire Quality
Grading112
Used batteries,
disposal151
Used engine oil,
disposal124VVacuum cleaner,
connecting93
Vanity mirror
bulb replacement144t
Vehicle battery148, 170
Vehicle care
exterior129
interior131
Vehicle Identification
Number (VIN)126
Vehicle immobilizer31
Vehicle painting129
Vehicle storage133
Vehicle weight168
Ventilation84
draft-free88
Vinyl, care131
Voice recognition23
WWarning lamps20t
Warning messages72t
Warranty and Service Guide
Booklet127
Washing your vehicle128
Water on roadways103
Waxing, paintwork130
Wear indicator in the
tires111
Weights168
Wheel rims114
Wheelbase167
Wheels and tires114, 116
Width167
Windows
convenience
operation32, 33
remote control33
Windshield washer reservoir,
filling
Windshield wiper65
Winter operation108
Winter tires114, 115
Wiper system65
Work in the engine
compartment118tXXenon lamps139, 163