1998 BMW 740I radio antenna

6n

For your own safety
Use unleaded gasoline only. Fuels
containing up to 10% ethanol or
other oxygenates with up to 2.8% oxy-
gen by weight (i.e., 15% MTBE or
3% methanol plus an equivalent
amount of co-solvent) will not void the
applicable warranties with respect to
defects in materials or workmanship.
Field experience has indicated signifi-
cant differences in fuel quality (i.e., vol-
atility, composition, additives, etc.)
among gasolines offered for sale in the
United States and Canada. The use of
poor-quality fuels may result in drive-
ability, starting and stalling problems,
especially under certain environmental
conditions, such as high ambient tem-
perature and high altitude.
Should you encounter driveability prob-
lems that you suspect could be related
to the fuel you are using, we recom-
mend that you respond by switching to
a recognized high-quality brand.
Failure to comply with these recom-
mendations may result in unscheduled
maintenance.
Follow the relevant safety rules when
you are handling gasoline.
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Important safety information!
For your own safety, use genuine
parts and accessories approved by
BMW.
When you purchase accessories tested
and approved by BMW and Original
BMW Parts, you simultaneously acquire
the assurance that they have been thor-
oughly tested by BMW to ensure opti-
mum performance when installed on
your vehicle.
BMW warrants these parts to be free
from defects in material and workman-
ship.
BMW will not accept any liability for
damage resulting from installation of
parts and accessories not approved by
BMW.
BMW cannot test every product from
other manufacturers to verify if it can be
used on a BMW safely and without risk
to either the vehicle, its operation, or its
occupants.
Original BMW Parts, BMW Accessories
and other products approved by BMW,
together with professional advice on
using these items, are available from all
BMW centers.

Installation and operation of non-BMW
approved accessories such as alarms,
radios, amplifiers, radar detectors,
wheels, suspension components, brake
dust shields, telephones (including op-
eration of any portable cellular phone
from within the vehicle without using an
externally-mounted antenna) or trans-
ceiver equipment (C.B., walkie-talkie,
ham radio, for instance) may cause ex-
tensive damage to the vehicle, compro-
mise its safety, interfere with the vehi-
cle's electrical system, or affect the
validity of the BMW Limited Warranty.
See your authorized BMW center for
additional information.

<


Maintenance, replacement, or re-
pair of the emission control de-
vices and systems may be performed
by any automotive repair establishment
or individual using any certified automo-
tive part.

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131n
RepairsIndexOverview Controls Car care Technology Data
Cellular phone Radio receptionMobile communications systems (cellu-
lar phone, radio, etc.) are permitted with
an output up to 10 watts only. Even
these systems may trigger malfunctions
in the operation of your vehicle if they
are not specifically designed for use
with the vehicle. BMW can neither test
nor assume responsibility for every indi-
vidual product being offered on the
market. We recommend that you con-
sult your BMW center before purchas-
ing any device of this kind.
To ensure that your BMW continues to
provide reliable and trouble-free opera-
tion, refrain from using a cellular phone
or other radio device with an antenna
located inside the passenger compart-
ment. The antenna should always be
mounted on the outside of the vehicle.
Before loading the vehicle on a
car-carrier train or driving it
through a car-wash, remove the an-
tenna.<
The reception and sound quality ob-
tained from mobile radios varies ac-
cording to a variety of factors, including
the broadcast range of the transmitter
and the directional orientation of the
antenna. Interference factors such as
high-tension power lines, buildings and
natural obstructions can all lead to un-
avoidable reception interference, re-
gardless of how well the vehicle sound
system is operating.
Climatic factors such as intense solar
radiation, fog, rain and snow can also
interfere with reception.
Cellular phones without official BMW
approval can also generate interfer-
ence. This phenomenon assumes the
form of a low-pitched hum emanating
from the speaker system.
Please refer to the supplementary oper-
ating instructions provided with your
sound system for detailed information
on its use.

186n
Radio reception BMW Active Seat
*
AM provides substantially longer recep-
tion ranges than FM. AM broadcast sig-
nals, propagated at ground level in the
form of surface waves, are also re-
flected from the ionosphere as atmo-
spheric waves.
Frequency-modulation (FM) provides
substantially better sound quality than
AM. However, because FM transmis-
sions rely on line-of-sight broadcast
waves, their effective reception range is
limited.360de062
Although numerous factors combine to
impose inherent limitations on the re-
ception quality available from mobile ra-
dios, specially designed systems can
be employed to minimize their effects:
With radio stations which broadcast
over multiple frequencies, the "Radio
Data System" (RDS) ensures that the
frequency with the best reception qual-
ity will automatically be selected.
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.
Because the ongoing antenna selection
process is completed within millisec-
onds, it remains inaudible to the radio
listener.The Active Seat is an advanced devel-
opment in BMW seats. These seats are
engineered with orthopedic consider-
ations so that you will be less fatigued
during longer trips and sitting for long
periods without moving. The seat is no
longer a passive link between the road,
the running gear, and the driver. In-
stead, by means of an active modifica-
tion to the seat's surface, the seat
causes weight transfers which are slight
and imperceptible. The basic seating
position is not changed by this.
In the seat's upholstery, beneath the
surface of the seat, there is a cushion of
fluid on the left and right. The fluid is
slowly circulated back and forth be-
tween the cushions by means of a
pump.
380de676

189n
RepairsIndexOverview Controls Car care Technology Data
Tire Pressure Control (RDC)
*
The Tire Pressure Control system as-
sumes the task of regular tire pressure
checks for you. Tire pressures are mon-
itored at all four wheels, even when the
vehicle is moving.
Behind the valve stem in every wheel,
there is an electronic chip which 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 de-
tected, the transmission rate is in-
creased.380de673
Near every wheel, there are antennas in
the body which receive the signals from
all four wheels. 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 ZAABS125
Accessories6
Activated-charcoal filter105
Active seat48
Adaptive Transmission
Control (ATC)63
Adding engine oil143
Adding washer fluid142
Adjust the backrest46
Adjusting steering wheel49
Air distribution102
Air flow103
Air jets100
Air pressure132
Airbags55
Alarm system40
Deactivating in an
emergency41
Antenna diversity186
Antifreeze146
Antifreeze, radiator128, 146
Antilock Brake System
(ABS)125
Anti-theft alarm system
32,40
Approved gross vehicle
weight196
Aquaplaning123,132
Armrest111
ASC+T (Automatic Stability
Control plus Traction)92Ashtray114
AUC (Automatic recirculated-
air control)103
Audio System78
Automatic car washes150
Automatic climate
control100
Automatic climate control,
removing window
condensation102
Automatic recirculated-air
control (AUC)103
Automatic Soft-Close
feature38
Automatic Stability Control
plus Traction (ASC+T)92
Automatic steering wheel
adjustment49
Automatic transmission62
Automatic transmission with
Steptronic65
Automatic windshield
washer69
Average fuel consumption 85
Average speed86
Axle loads196
BBackup lamps, bulb
replacement166
Battery173,198
Battery capacity198Battery change, radio remote
control168
Battery charge current20
Battery, discharged179
Battery, removal and
installation175
Belts54
Beverage holders113
Blower103
Body-cavity protectant151
Brake faults128
Brake fluid147
Brake hydraulic system20
Brake lamps, bulb
replacement166
Brakes126
Break-in procedure122
Break-resistant security
glass, care153
Bulb replacement163
CCar jack170
Car Memory53
Car radio reception131, 186
Car telephone113
Car wash150
Care, exterior152
Care, interior154
Caring for the vehicle
finish152
Caring for your car150Catalytic converter124
Cellular phone131
Center (high-mount) brake
lamp166
Central locking system32
Central locking system,
button36
Changing a wheel170
Charge indicator lamp20
Charging the battery174
Check Control75
CHECK key75
Checking the engine oil143
Checking tire pressure26
Child restraints57
Childproof door locks58
Cigarette lighter115
Clock,
refer to Digital clock79
Code88
Refer to the Radio Owner's
Manuel
Codes, tires134
Coin tray113
Cold start60
Comfort seats47
Connecting a car vacuum
cleaner115
Consumption display73
Contour seat48