seats BMW 740I 1998 User Guide

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

187n
RepairsIndexOverview Controls Car care Technology Data
BMW Active Seat
*
Safety belt tensioner DSP sound system
*
This causes a movement of the spinal
column which is barely detectable, to-
gether with an improvement in the flow
of blood to the intervertebral disks and
the muscle structure in the area of the
spinal column.
The passengers do not suffer as much
from muscle tension, back pain in the
lumbar region or symptoms of fatigue.
As a result, the Active Seat represents a
significant contribution to driving com-
fort and driving safety.
The safety belt tensioner responds to
collisions by tightening the belts to en-
sure that occupants remain firmly posi-
tioned in their seats. A gas-pressure
system retracts the buckle assembly to
tension the shoulder and lap belts
within fractions of a second. This re-
duces the tendency to slide under the
lap belt.
390de330
The DSP Professional premium sound
system features a special amplifier
combined with Digital Sound Process-
ing (DSP) and integrated speakers to
surround you with crisp, true-to-life
sound reproduction.
The speaker system's subwoofers,
woofers, midrange speakers and tweet-
ers furnish you with an impressively full-
bodied listening experience. The indi-
vidual components are oriented so as
to produce the aural sensation that you
would experience facing the stage in a
concert hall. The system also automati-
cally adjusts the bass and treble set-
tings to compensate for changes in vol-
ume and vehicle speed.390de109

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

Everything from A to ZHeadlamp flasher68
Headlamp washer
system142
Headlamp washers69
Heated seats106
Heated steering wheel106
Heating and ventilation100
Heating during a stop104
Height195
HiFi system187
High beam headlamps,
bulb replacement164
High beams68
Hood release137
Horn23IIce warning72
Ignition key30
Ignition switch59
Independent ventilation
system107
Indicator lamps20
Inflation pressures26,132
INSPECTION74
Instrument cluster18
Instrument lighting96
Integrated Universal Remote
Control108
Interior door handles,
lighted36,96
Interior lamps32,97Interior lamps, bulb
replacement167
Interior lamps,
radio remote control34
Interior motion sensor40
Interior rearview mirror,
automatic dimming50
Intermittent wipe switch68
JJump starting179KKey Memory53
Keys30
Kickdown63,66LLashing eyes39,118
Leather care154
Length195
Level control system148
License plate lamps, bulb
replacement166
Light switch96
Lighted exterior door handles
32,33
Lighted interior door handles
36,96
LIGHTS ON warning96
Limit87
Loading118Load-securing devices118
Locking and unlocking the
doors32
Locks, care128
Low beam headlamps, bulb
replacement164
Low beams96
Low-fuel warning lamp73
Lug bolts171
Luggage compartment 37, 39
Nets39
Luggage compartment
lamps, bulb
replacement167
Luggage compartment lid 37
Luggage compartment lid,
Automatic Soft-Close38
Luggage compartment lid,
manual operation37
Luggage compartment
nets39
Luggage compartment,
emergency release37
Luggage compartment,
locking separately37
Luggage compartment, radio
remote control34
Luggage rack118
Luggage straps39
Lumbar support47
MMaintenance74,149
Malfunction displays75
Manually controlled
recirculated-air103
Master key30
Memory51,53
MFL (Multi-function steering
wheel)23
Microfilter105
MID (Multi-Information
Display)78
Mirror defrosting50
Mirror memory51
Mirrors50
Modifications,
technical6,157
Multi-function armrest112
Multi-function steering wheel
(MFL)23
Multi-Information Display
(MID)78NNew transmitter, radio
remote control168
Nozzles100OOBD connector158
Odometer72
Oil additives143