2001 BMW 325I sensor

177n
IndexDataTechnologyRepairsCar careControlsOverview
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
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.390de133
When the system is set to the "Intermit-
tent" wiper speed, the wipers react
immediately Ð 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.

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.

Everything from A to ZFolding rear backrest108
Footbrake118
Footwell lamps88
bulb replacement158
Four-wheel drive175
Front fog lamps, bulb
replacement155
Front seat adjustment46
Frost protection,
radiator137
Fuel28
consumption77
consumption display74
gauge74
preparation184
quality28
Fuel filler door
releasing following an
electrical malfunction166
Fuel reserve indicator
lamp74
Fuel tank capacity187
Fuel tank gauge74
Functional status179
Fuses164 G
Gasoline28
Gasoline gauge74
Gasoline quality28
Glove compartment101 Glove compartment lamp,
bulb replacement158
Gross vehicle weight186
H
Handbrake63
Hands-free system103
Hazard warning flashers26
Hazard warning triangle26
Head restraint47
Headlamp covers,
care141,153
Headlamp flasher88
Headlamp washer
system70,134,187
Heated seats100
Heating, rapid94
Heavy loads110
Height185
HiFi system101
High beams23,68,88
bulb replacement153
High Performance Synthetic
Oils136
High-mount brake lamp157
Hood release130
Horn17
Hubcap160
Hydraulic Brake assistant,
refer to DBC118
I
Ice warning76
Icy roads76,121
Identification, tires127
Ignition key32,35
Ignition lock61
Imprint4
Indicator lamps20
Inflation pressure28,124
monitoring85,178
INSPECTION74
Installation child restraint
systems60
Instrument cluster18
Instrument lighting87
Interaxle tire rotation126
Interface socket for Onboard
Diagnostics149
Interference, cellular
phone123
Interior lamps36,88
bulb replacement158
remote control36
Interior motion sensor41
Interior rearview mirror51
automatic dimming
feature52,176
Interlock61
Intermittent wipe68
J
Jack159
Jump-starting167 K
Key32,35
Key Memory52 L
Lamps and bulbs153
Lashing eyes110
LATCH attachment of the
child seat58
Leather care145
Length185
License plate lamp
bulb replacement157
Light switch87
Light-alloy wheels129
Lighter104
Load-securing devices110
Louvers90,96
Low beam headlamps87
bulb replacement153
Lug bolts160
Lug wrench159

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

Owner service proceduresA
Activated-charcoal filter,
changing165
Adding brake fluid138
Adding engine coolant138
Adding engine oil135
Adjust washer nozzles134
Air pressure, checking28
Antifreeze138 B
Backup lamps
bulb replacement156
Battery
care163
charging164
removal and
installation163
Brake fluid, adding138
Brake lamps
bulb replacement156
Brakes, brake faults120 C
Changing a tire159
Changing a wheel159
Changing the
microfilter165
Charging the battery164 Check air pressure28
Check Control75
Checking air pressure28
Checking engine oil
level135
D
Defrost setting94
Defrosting the windows94
Difficult steering123
Disposal
batteries164
engine oil136
Doors, emergency
actuation34 E
Electrical accessories,
failure164
Electrical defect
fuel filler door166
sliding/tilt sunroof166
Emergency operation
doors34
fuel filler door166
luggage
compartment166
sliding/tilt sunroof166 Engine oil
add135
quality136
specifications136
viscosity136
Engine oil level,
checking135
F
Failure messages75
Filling washer reservoir134
First-aid kit26
Fittings, tow starting and
towing168
Flat tire159
Footwell lamps, bulb
replacement158
Front fog lamps
bulb replacement155
Fuses, replacing164 G
Glove compartment lamp,
bulb replacement158
H
Hatch lamps
bulb replacement156
Hatch, emergency lock
operation166
Hazard warning flashers26
Hazard warning triangle26
Headlamp cover, care153
High beams, bulb
replacement153 I
Indicator lamps20
Inflated pressure28
Interior lamps, bulb
replacement158
Interior motion sensor,
switching off42 J
Jack159 L
License plate lamp
bulb replacement157
Low beams, bulb
replacement153
Lug wrench159

Owner service procedures
199n
IndexDataTechnologyRepairsCar careControlsOverview
Luggage compartment
emergency actuation166
Luggage compartment
lamps, bulb
replacement158 M
Maintenance140
Malfunction displays75
Microfilter, change165
Motion sensor, switching
off42 O
Oil
quality136
specifications136
viscosity136
Onboard tool kit152 P
Pressure, tires28 R
Rear hatch lamp
bulb replacement157
Rear lamp156
Release the hood130 Releasing the fuel filler door
after an electrical
defect166
Removing condensation
from the windows94
Replace windshield wiper
blades152
Replacement key32
Replacing lamp bulbs153
Replenish washer
reservoir134
Return used batteries164
S
Side lamps
bulb replacement154
Sliding/tilt sunroof
close in event of electrical
defect166
Space-saver spare tire159
Spare key32
Spare tire159
Spare wheel159
Starting problems115
Switching off tilt alarm/
interior motion sensor42
T
Tail lamps
bulb replacement156
Tailgate lamps
bulb replacement156
Tailgate, emergency lock
operation166
Tilt alarm, switching off42
Tire changing159
Tire damage124
Tools152
Tow fittings168
Tow starting168
Towing168
Turn signals, bulb
replacement154 U
Use antifreeze for
radiator138
Used batteries164
Used engine oil136 V
Vanity mirror lamp, bulb
replacement158
W

Warning lamps20
Warning messages75
Washer fluid, adding134
Washer nozzles,
adjusting134
Washer reservoir, filling134
Wheel changing159
Windshield wiper blades,
replacing152
Working in the engine
compartment130