2000 BMW 323Ci CONVERTIBLE sensor

173n
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 ade-
quate, 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 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 necessarily
accompanied by a certain amount of
ignition and inflation noise. The gas
required to inflate the airbags is not
dangerous, and the smoke associated
with it dissipates.
The entire process is completed within
fractions of a second.Highly sensitive sensors monitor the
wheel speeds, steering angle, lateral
acceleration, brake pressure and the
movement of the vehicle around its
vertical axis.
If differences in the wheel speeds occur,
the system counteracts the danger of
wheelspin by reducing torque. If neces-
sary, 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 sig-
nals. If deviations from this occur (un-
dersteering or oversteering, for in-
stance), DSC can stabilize the vehicle in
fractions of a second by reducing engine
output and with the assistance of brak-
ing intervention at individual wheels.
As a result, most skids can be preven-
ted from their very onset.
You may need some time to become
accustomed to this system intervention.
However, it provides optimum drive
force and vehicle stability.
The braking intervention may be
accompanied by sounds specific to
the system.
Airbags DSC

175n
IndexDataTechnologyRepairsCar careControlsOverview
Interior rearview mirror with automatic dimmer
*
The interior rearview mirror with auto-
matic dimming feature reduces glare 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 light sensor is mounted on the front
of the mirror housing. This sensor, the
one that is directed forward, measures
light intensity in the area ahead of the
vehicle. The second sensor is inte-
grated 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 semi-
solid layer incorporated in the lens.46cus036
The semisolid reacts chemically to this
electrical current, dimming the mirror
through an infinitely-variable range
(electrochromic technology).
As a result, it is no longer necessary to
dim the mirror manually, and the driver
can concentrate completely on traffic
conditions.

176n
Rain sensor
*
Depending on how wet the windshield
is, the rain sensor controls the opera-
tion of the windshield wipers.
Infrared light is carried along the sur-
face of the windshield in an optical con-
ductor in such a manner that it is re-
flected completely when the windshield
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.390de133
When the system is set to the "Intermit-
tent" wiper speed, the wipers react im-
mediately – if water is splashed onto the
windshield by vehicles traveling ahead
of you, for example. As a result, the rain
sensor contributes to driving safety and
comfort.

177n
IndexDataTechnologyRepairsCar careControlsOverview
Tire Pressure Control (RDC)
*
This system regularly checks tire pres-
sure and monitors all four tires even
while driving, so you don't have to.
Behind the valve stem in every wheel,
there is an electronic chip that is de-
signed for severe-duty applications
and long service life. It contains a
pressure 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 transmis-
sion rate is increased. 46cde078
There is an antenna located right near
every wheel in the vehicle body. Each
antenna picks up signals from its re-
spective wheel. A central electronics
system evaluates all four signals and
forwards any changes. The RDC pro-
vides an important contribution to
driving safety.

179n
IndexDataTechnologyRepairsCar careControlsOverview
Rollover protection syste
m
Xenon lamps
*
The rollover protection system offers
additional protection apart from the air-
bags and safety belts. The system has
highly sensitive sensors that react im-
mediately upon detecting an unstable
vehicle condition, i.e. when the vehicle
is tilted to a critical degree, or if the
wheels are not making proper ground
contact. In this kind of situation, the
protective bar in each rear head
restraint is triggered.
Xenon lamps illuminate the side and
front areas of the vehicle with signifi-
cantly more brightness and uniformity
than the traditional halogen lamp.
In a xenon lamp, an electric arc re-
places the filament in order to generate
intense illumination. A gas mixture in a
quartz glass tube with metal vapor is
ignited by a high electric voltage. The
arc that is generated is then sustained
by a lower voltage. When the lamp is
turned on there is a brief warm-up
period. Maximum brightness is attained
in approx. 15 seconds.
390de134
Xenon lamps provide significantly im-
proved visibility, especially during ad-
verse weather and poor driving condi-
tions e.g. driving at night in heavy rain
or through road repair areas where
there are no lane markers.
Vehicles with xenon lamps are equipped
with automatic headlamp range control.
As a result, the highway is always opti-
mally lighted, regardless of road condi-
tions, and drivers in oncoming traffic are
not blinded.
Xenon lamps make a significant contri-
bution to highway safety since pedestri-
ans and other highway users, bicyclists
and motorcyclists in the right lane, are
more easily detected.

Everything from A to Z
193n
IndexDataTechnologyRepairsCar careControlsOverview
Manual transmission73
Manually controlled
recirculated-air97
Memory57
MFL (Multifunction steering
wheel)24
Mirror memory57
Mirrors58
Mobile phones120
Modifications,
technical6, 148
Multifunction steering wheel
(MFL)24NNavigation system, refer to
the Radio Owner's ManualOOBD interface socket149
Odometer82
Oil
additives133
capacity185
consumption133
dipstick133
quality134
specifications134
viscosity134
Oil change intervals, see the
Service and Warranty
Information BookletOil filter change185
Oil level
check133
Indicator lamp20
Oil pressure, indicator
lamp20
OILSERVICE83
Onboard computer85
also refer to separate
Owner's Manual
Onboard tool kit152
Opening and closing
from inside38
from outside34
Operating the convertible
top
manual convertible top45
Outlets, ventilation94
Outside temperature
display85
PPaint blemishes140
Paint, care140
Paintwork, minor
repairs141
Paintwork, waxing141
Park Distance Control
(PDC)87
Parking brake72
Parking help87
Parking lamps92Parking, winter119
PDC (Park Distance
Control)87
Performance182
Pocket lamp99
Pollen98
Power seats53
Power steering120
Power windows44
Pressure monitoring,
tires89, 177
Pressure, tires27, 123
RRadiator185
Radio Data System
(RDS)174
Radio reception120, 174
Radio, refer to the separate
Owner's Manual
Rain sensor78, 176
RDC (Tire Pressure
Control)89, 177
RDS (Radio Data
System)174
Reading lamps93
Rear lamp155
Rear window
defroster79, 98
Rearview mirror58, 59
Reclining seat53
Refueling26Remote control35
Remote control key32
Remove condensation,
windows97
Replacement key32
Reporting safety defects7
Restraint system61, 66
Reverse17, 73
Rollover protection
system68, 179
lowering68
Roof load capacity184
Roof luggage rack108
Roof-carrier assembly121
Rubber parts118
SSafety belt tensioners174
Safety belts61
Safety buttons38
Seat heating99
Seat memory57
Seat-integrated safety belt
system56
Seats
sitting properly53, 64
Securing cargo107
Securing loads107
Selector lever, automatic
transmission74
Self-defrosting mirrors59
Self-diagnostics178

Everything from A to ZService and Warranty
Information Booklet (US
models)138
Service Interval
Display83, 138
Shiftlock74
Side airbags63
Side lamps91
bulb replacement154
Sitting properly53
using airbags64
Ski bag105
Skid control119
Slippery roads118
Snow chains118, 128
Socket104
Space-saver spare tire159
Spare key32
Spare tire159
Spark plugs186
Speaker103
Speedometer18
Starting70
Starting problems113, 168
Steel wheels128
Steering120
Steering wheel lock70
Steptronic74
Stopping the vehicle71
Storage compartments102
Storing your vehicle147
Stroke182
Summer tires126Switching off the engine71
Symbols4, 163
Synthetic oils134
TTachometer82
Tail lamps155
bulb replacement155
Tank capacity185
Tank cover
unlock in case of electrical
fault165
Technical data182
Technical
modifications6, 148
Telephone
refer to the separate
Owner's Manual
Telephone hookup103
Temperature display
outside temperature85
Temperature gauge
engine coolant83
Temperature layering98
Tether anchorage for child
retsraint66
Third brake lamp157
Tilt alarm37
remote control37
Tilt sensor alarm system43
Tire codes126
Tire damages123Tire inflation
pressure27, 123
Tire Pressure Control
(RDC)89, 177
Tire pressure
monitoring89, 177
Tire pressure, checking27
Tire replacement124, 125
Tire specifications128
Tire tread123
Tools152
Torque182
Tow fittings169
Towing169
Track183
Traction Control System
refer to DSC88
Transmission73
Tread depth, tires123
Trip odometer82
Trunk39
locking separately39
Trunk lid, refer to luggage
compartment lid39
Turn signal indicator23, 77
Turn signals
bulb replacement154
Turning radius183
Two-way radios120
UUniform Tire Quality
Grading124Universal Transmitter100
Used batteries164
VVehicle
battery162, 186
identification137
immobilizer33
painting140
starting70
storage147
weight184
Vehicle care
exterior140
interior141
Vehicle Identification
Number (VIN)137
Ventilation94
draft-free98
Vinyl upholstery, care142
Visors59WWarning lamp "Please fasten
safety belts"21
Warning lamps20
Warning messages84
Warranty and Service Guide
(Canadian models)138
Washer reservoir, filling132
Washing your car139
Water on roadways
deep water113

Owner service procedures
197n
IndexDataTechnologyRepairsCar careControlsOverview
Starting problems71, 113
Switching off the interior
motion sensor43
Switching off the tilt sensor
alarm system43TTail lamps155
bulb replacement155
Tire damage123
Tire rotation159
Tools152
Tow fittings169
Towing169
Turn signal indicator
bulb replacement154UUse of antifreeze,
radiator136WWarning lamps20
Warning messages84
Washer fluid, adding132
Washer nozzles,
adjusting132
Wheel lug wrench159
Working in the engine
compartment129