brake sensor BMW X3 2.5I 2004 E83 Owner's Manual

Technology for comfort, convenience and safety
50
Limits of the system
Even with PDC, final responsibility for
estimating the distance between the
vehicle and any obstructions always
remains with the driver. Even when sensors
are involved, there is a blind spot in which
objects cannot be detected. The system is
also subject to the physical limits that apply
to all forms of ultrasonic measurement,
such as those encountered with tow bars
and trailer couplings, or thin and wedge-
shaped objects etc. Low objects already
displayed, e.g. a curb, can also disappear
from the detection area of the sensors
again before a continuous tone sounds.
Loud sources of sound, inside and outside
the vehicle, could drown out the PDC sig-
nal tone.<
Keep the sensors clean and free of ice
or snow in order to ensure that they
will continue to operate effectively.
Do not apply high pressure spray to the
sensors for a prolonged period of time.
Keep the spray at least 4 in/10 cm away
from the sensors.<
Driving stability control
systems
Your BMW is equipped with an extended
array of systems designed to enhance and
maintain vehicle stability under extreme
conditions. The following section describes
these functions based on ABS, DSC, HDC
and xDrive.
Antilock Brake System ABS
ABS enhances active safety by preventing
the wheels from locking under braking. The
vehicle continues to be steerable during
hard braking.
ABS also includes Electronic brake-force
distribution EBV.
Safe braking, refer to page 77.
Electronic brake-force distribution
EBV
EBV controls the brake system's applica-
tion pressure at the rear wheels to ensure
stable deceleration.
Dynamic Brake Control DBC
The Dynamic Brake Control actively sup-
ports the driver in dangerous braking situa-
tions. Quickly pumping the brake pedal
increases the braking effect with low pedal
pressure so that the shortest possible
braking distance is achieved. This system
exploits all of the benefits provided by ABS.
Do not reduce the pressure on the brake
pedal for the duration of the brake applica-
tion. DBC is deactivated when you release
the brake pedal.
Dynamic Stability Control DSC
The concept
DSC maintains vehicle stability, even in
critical driving situations.
The DSC is operational every time you start
the engine.
The system optimizes the driving stability
during acceleration and when starting from
a standstill. The system recognizes any
tendency for the vehicle to assume an
unstable attitude such as oversteer or
understeer; it then counteracts this ten-
dency with a combination of graduated
reductions in engine torque and selective
braking intervention at individual wheels.
DSC provides optimal stability within the
limits defined by the laws of physics.
The laws of physics cannot be
repealed, even with DSC. An appro-
priate driving style always remains the
responsibility of the driver. Avoid using the
additional safety margin provided by the
system as an excuse for taking unneces-
sary risks.
Do not make any modifications to the DSC
system. Never allow anyone other than
authorized professional technicians to
carry out service or repairs on the system.<

Reference
At a glance
Controls
Driving tips
Mobility
77
to a fire, and with it the risk of serious prop-
erty damage as well as personal injury.<
Parking the vehicle
Condensation forms in the air conditioner
system during operation, and then exits
under the vehicle. Traces of condensed
water under the vehicle are thus normal.
Before driving into the car wash
Fold in the exterior mirrors, refer to
page 31, as otherwise they could be dam-
aged due to the width of the vehicle.
Deactivate the rain sensor as otherwise
damage could result from undesired wiper
activation, refer to page 42.
Hydroplaning
When driving on wet or slushy roads,
reduce road speed. If you do not, a
wedge of water can form between tires and
road surface. This phenomenon is referred
to as hydroplaning, and is characterized by
a partial or complete loss of contact
between tires and road surface, ultimately
undermining your ability to steer and brake
the vehicle.<
Driving through water
Do not drive through water on the
road if it is deeper than 20 in/50 cm,
and then only at walking speed. Otherwise,
the vehicle's engine, the electrical systems
and the transmission may be damaged.<
Safe braking
Emergency stops
The best way to brake is to apply maximum
pressure to the brake pedal during emer-
gency Ð panic stops. Since the vehicle
maintains steering responsiveness, you
can nevertheless avoid possible obstacles
with a minimum of steering effort.
Pulsation at the brake pedal combined with
sounds from the hydraulic circuits indicates
to the driver that ABS is in its active mode. Do not drive with your foot resting on
the brake pedal. Otherwise, even light
but consistent pedal pressure can lead to
high temperatures, brake wear and possi-
bly even brake failure.<
Wet conditions
While driving in wet conditions and in
heavy rain, it is a good idea to apply light
pressure to the brake pedal every few
miles. Watch traffic conditions to ensure
that this maneuver does not endanger
other road users. The heat which is gener-
ated by the brake applications helps to dry
the brake pads and rotors. The required
braking force will then be available when
you need it.
On a grade
You can retain full and unimpaired braking
efficiency by downshifting to a gear in
which only minimal brake applications are
needed when descending long or steep
downhill stretches.
You can further enhance the engine's brak-
ing effect by selecting a lower gear in the
automatic transmission's manual mode,
downshifting as far as first gear on
extremely steep stretches, refer to
page 38. This strategy helps you avoid
placing excessive loads on the brake sys-
tem.
During slower downhill driving, use the Hill
Descent Control HDC, refer to page 51.
Never drive with the clutch pressed,
with the transmission in Neutral or
with the engine switched off, as otherwise
there is no engine braking when the trans-
mission is in Neutral, and no power-assist
for brakes and steering.
Never allow floor mats, carpets or any other
objects to protrude into the area around the
accelerator and brake pedals and obstruct
their movement.<
Corrosion
When the vehicle is driven only occasion-
ally, during extended periods when the
vehicle is not used at all, and in operating
conditions where brake applications are

Reference
At a glance
Controls
Driving tips
Mobility
121
Coolant 95
Ð indicator lamp 95
Ð level 96
Ð temperature gauge 45
Coolant temperature
gauge 45
Cooling, refer to
Temperature 61
Copyright 2
Cruise control
Ð buttons in steering
wheel 14
Ð indicator lamp 43
Cruise control, refer to
Ð Programmable cruise
control 43
Cruising range 48
Cup holder, refer to
Beverage holders 67
Curb weight 116
Cylinders, refer to Engine
data 114
D
Dashboard system, refer to
Cockpit 10
Data, technical
Ð dimensions 115
Ð engine 114
Ð filling capacities 117
Ð weights 116
Daytime driving lamp 57
DBC Dynamic Brake
Control 50
Ð indicator lamp 50
Decommissioning the
vehicle, refer to Caring for
your vehicle brochure 97
Defect, refer to Manual
operation
Defects 7
Defrosting, windows 61
Ð air conditioner 62
Ð automatic climate
control 64
Ð rear window
defroster 61, 65Defrosting windows and
removing condensation
Ð air conditioner 62
Ð automatic climate
control 64
Defrosting windshield, refer
to Defrosting
windows 62, 64
Defrost position, refer to
Defrosting
windows 62, 64
Digital clock 46
Dimensions 115
Dipstick, engine oil 94
Directional indicators, refer
to Turn signal
indicators 41
Discs brakes 76, 77
Displacement, refer to
Engine data 114
Display lighting, refer to
Instrument lighting 58
Displays, refer to
Instrument
cluster 11
Disposal
Ð batteries 106
Ð oil 95
Doors
Ð locking and unlocking 20
Ð manual operation 20
DOT Quality Grades 88
Draft-free ventilation 61, 65
Drawbar support load 116
Driving lamps, refer to
Parking lamps/low
beams 57
Driving notes 76
Driving on bad roads 80
Driving stability control
systems 50
Driving through water 80
DSC Dynamic Stability
Control 50
Ð indicator lamp 51
E
Electrical malfunction
Ð door lock 20
Ð doors 20
Ð driver's door 20
Ð fuel filler door 84
Ð panorama glass roof 24
Ð tailgate 21
Electric power windows 22
Electronic Stability
Program ESP, refer to
Dynamic Stability
Control 50
Emergency actuation, refer
to Manual operation
Emergency call 107
Engine
Ð breaking in 76
Ð data 114
Ð indicator lamp 37
Ð malfunction in electronic
circuitry 38
Ð speed 45
Engine compartment 93
Engine coolant 95
Engine hood 92
Engine oil 95
Ð indicator/warning
lamp 94
Ð prescribed oils 95
Engine oil grades 95
Engine oil level 94
Ð indicator/warning
lamp 94
Engine oil pressure 94
Ð indicator/warning
lamp 94
Engine oil sensor 94
Ð indicator/warning
lamp 94
Engine output, refer to
Engine data 114
Engine temperature, refer
to Coolant
temperature 45
Equipment range, refer to
Service and Warranty
Information Booklet for

Reference
At a glance
Controls
Driving tips
Mobility
123
High beams
Ð bulb replacement 100
Ð headlamp flasher 58
Ð indicator lamp 12
High Performance
Synthetic Oil 95
Hill-climbing ability, refer to
Driving on bad roads 80
Hill descent assistance,
refer to HDC 51
Hill Descent Control
HDC 51
Hills 77
Holder for beverage
cans 67
Horn 10
Hydraulic Brake Assistant,
refer to DBC 50
Hydroplaning 77
I
Ice warning 47
Ignition 37
Ignition key 18
Ignition lock 37
Imprint 2
Indicator/warning lamp
Ð airbags 55
Ð alarm system 25
Ð brake system 96
Ð DSC 51
Ð Flat Tire Monitor 53
Ð fog lamps 58
Ð reserve 45
Ð safety belt warning 30
Indicator/warning lamps 12
Individual settings, refer to
Vehicle Memory, Key
Memory 33
Inflation pressure, tires 86
Inflation pressure
monitoring, refer to Flat
Tire Monitor 53
Instrument cluster 10, 11
Instrument illumination 58
Instrument lighting 58
Integrated universal remote
control 66
Interior lamps 58Interior mirror
Ð automatic dimming
feature 32
Interior motion
sensor 22, 25
Ð switching off 19
Interior rearview mirror 32
Interlock, refer to Ignition
lock 37
Intermittent
Ð operation, wipers 41
J
Jacking points 104
Jumping, refer to Jump-
starting 108
Jump-starting 108
K
Key Memory 33
Keys 18
Kickdown 40
L
Lamps and bulbs 99
Lashing eyes, refer to
Securing the load 79
Leather care, refer to
Caring for your vehicle
brochure
LEDs light-emitting
diodes 103
License plate lamp
Ð bulb replacement 102
Lifting handle, compact
wheel 104
Light-alloy wheels, care,
refer to Caring for your
vehicle brochure
Light-emitting diodes
LEDs 103
Lighter 69
Lighter socket 69
Lighting of instruments 58
Lighting of the instruments,
refer to Instrument
lighting 58Lights, refer to Parking
lamps/low beams 57
Lights on warning 57
Load, refer to Loading 78
Loading
Ð securing the load 79
Ð stowing cargo 79
Ð vehicle 78
Loading area
Ð lid, refer to Tailgate 21
Load securing devices 79
Locking
Ð from inside 20
Ð from outside 18
Locking and unlocking
doors
Ð from inside 20
Ð from outside 18
Longlife oils
Ð approved oils 95
Low beams 57
Ð automatic 57
Ð bulb replacement 100
Ð indicator lamp 57
Low-fuel warning light,
refer to Fuel gauge 45
Lug bolts 104
Luggage compartment,
refer to Cargo area
Luggage rack, refer to
Roof-mounted luggage
rack 79
Lumbar support 29
M
Maintenance 97
Maintenance system,
BMW 97
Malfunction in automatic
transmission system 41
Manual operation
Ð doors 20
Ð driver's door 20
Ð fuel filler door 84
Ð glass roof 24
Ð panorama glass roof 24
Ð tailgate 21
Manual transmission 39
Master keys with remote
control 18

Everything from A to Z
124 Maximum axle loads 116
Maximum roof weight 116
MD operation, refer to
Owner's Manual for
Radio/Onboard computer
Mechanical seats 28
Memory, refer to Seat and
mirror memory 29
Memory, refer to Vehicle
Memory, Key Memory 33
Microfilter
Ð air conditioner 62
Ð automatic climate
control 65
Microphone, refer to Car
phone preparation 70
Microphone for
telephone 70
Mileage, refer to Engine
data 114
Mini-Disc operation, refer
to Owner's Manual for
Radio/Onboard computer
Mirror
Ð automatic curb
monitor 32
Ð mirror heating 32
Ð mirror memory, refer to
Seat and mirror
memory 29
Mirror dimming feature 32
Mirrors 31
Mobile Service, refer to
Roadside Assistance 107
Modifications, technical 6
Multifunction switch
Ð turn signal indicators/
headlamp flasher 41
Ð washer/wiper system 41
N
Neck support, refer to Head
restraints 28
Next Service
indicator 46, 97
Nozzles, refer to
Ventilation 61, 65
Nylon rope 109
O
OBD connector 98
Octane number, refer to
Fuel quality 85
Odometer 45
Oil
Ð approved engine oils 95
Ð dipstick 94
Oil change interval, refer to
Next Service indicator 97
Oil change interval, refer to
Service Manual
Oil consumption 94
Oil grades 95
Oil level 94
Oil pressure 94
Oil sensor
Ð indicator lamp 94
OILSERVICE 46, 97
Onboard Diagnostic OBD
interface socket 98
Onboard tool kit 99
Opening and closing 18
Ð from inside 20
Ð from outside 18
Ð using the door lock 20
Ð using the remote
control 18
Operating on bad roads 80
Output, refer to Engine
data 114
Outside air 61
Ð air conditioner 61
Ð automatic climate
control 64
Outside temperature
display
Ð changing unit of
measure 47
Ð in computer 47
Overview indicator/warning
lamps 12
P
Package tray, refer to
Cargo area 71Panorama glass roof 23
Ð comfort operation 20
Ð manual operation 24
Ð protective function 24
Park Distance Control
PDC 49
Parking
Ð vehicle 38
Parking aid, refer to Park
Distance Control PDC 49
Parking brake, refer to
Handbrake 38
Parking lamps 57
Ð bulb replacement 101
Parking lamps/low
beams 57
Parking the vehicle 38
Particulate filter, refer to
Microfilter 62
Partition net 72
PDC Park Distance
Control 49
Plastic, refer to Caring for
your vehicle brochure
Pollen, refer to
Microfilter 62
Pollen, refer to Microfilter/
Activated charcoal
filter 65
Power seat 29
Pressure, tires 86
Pressure monitoring,
tires 53
Ð Flat Tire Monitor 53
Programming settings,
refer to Vehicle Memory,
Key Memory 33
Protective function
Ð panorama glass roof 24
Puncture
Ð Flat Tire Monitor 53
R
Radiator, refer to
Coolant 95
Radio, refer to separate
Owner's Manual
Radio navigation, refer to
separate Owner's Manual
Rain sensor 42