2005 BMW 645I CONVERTIBLE power steering

Opening and closing
28
Opening and closing
The key set
1Every master key with remote control con-
tains an extended-life battery as a power
supply, which is charged automatically in
the ignition lock as you drive. You should
use each master key at least twice a year in
order to maintain the charge condition.
Depending on which master key is detected
by the vehicle during unlocking, different
settings in the vehicle are requested and
executed, refer to Key Memory below.
2Spare key for storage in a safe place, such
as in your wallet.
This key does not fit in the locks of the lug-
gage compartment lid and the hotel func-
tion, refer to page32. This is an advantage
when valet parking at a hotel, for example.
The key is not intended for constant use.
New keys
New, additional or replacement keys are avail-
able at your BMW center.
Key Memory
How the system functions
Doubtless you have often reflected on how
great it would be if you could configure your
vehicle's various adjustment settings to meet
your own personal requirements. BMW has
designed several freely selectable options into
the vehicle during its development. You can set
these as desired via the Control Center.You can have up to four different basic settings
adjusted for four different persons for the spe-
cific keys. The only requirement is that each
person uses his or her own master key with
remote control.
When your vehicle is unlocked with the remote
control, the vehicle recognizes the individual
key by means of a data exchange and makes
adjustments accordingly.
Scope of Key Memory
>When unlocking with the remote control,
either unlock only the driver's door or the
entire vehicle, refer to page29.
>Locking the vehicle after a short time or
after starting to drive, refer to page31
>Assigning the programmable function but-
tons on the steering wheel, refer to page51.
>Settings for the display on the Control Dis-
play:
>Brightness of the Control Display, refer
to page77
>Units of measure for consumption,
route/distances, temperature and pres-
sure, refer to page77
>Language on the Control Display, refer
to page78
>12h/24h clock mode, refer to page78
>Date format, refer to page79.
>Displaying optical warning for the PDC Park
Distance Control
*, refer to page80.
>Selection and brightness of the display for
the Head-Up Display
*, refer to page89.
>Air distribution, temperature and intensity
for the automatic climate control, refer to
page96.
>Setting the language information for the
destination guidance of the navigation sys-
tem
*, refer to page126.

Controls
85Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Report of a flat tire
The warning lamp lights up in red. A
message appears on the Control Dis-
play. In addition, an acoustic signal
sounds. There is a flat tire or extensive inflation
pressure loss.
1.Cautiously reduce the vehicle speed to
below 50 mph/80 km/h. Avoid sudden brak-
ing and steering maneuvers. Do not exceed
a vehicle speed of 50 mph/80 km/h.
If the vehicle is not, as provided at the
factory, equipped with run-flat tires,
refer to page172, stop driving. Continued
driving after a flat tire can result in serious
accidents.<
2.Check the air pressure in all four tires at the
next opportunity.
If the tire inflation pressure in all four
tires is correct, the Flat Tire Monitor
may not have been initialized. The system
must then be initialized.<
3.In case of a complete loss of the tire inflation
pressure or obvious tire damage, you can
estimate the possible driving distance for
continued driving base on the following ref-
erence values:
>With low load:
1 to 2 persons without luggage:
approx. 155 miles/250 km.
>With medium load:
2 persons, luggage compartment full, or
4 persons without luggage:
approx. 94 miles/150 km.
>With full load:
4 persons, luggage compartment full:
approx. 30 miles/50 km.
Drive reservedly and do not exceed
a speed of 50 mph/80 km/h. In the
event of pressure loss, vehicle handling
changes. This includes reduced tracking
stability in braking, extended braking dis-
tance and altered natural steering charac-
teristics.
If unusual vibrations occur while the vehicle
is being driven, this can indicate final failure
of the damaged tire. Reduce speed and stop as soon as possible. Do not continue
driving. Contact your BMW center.<
Malfunction
The warning lamp lights up in yellow. A
message appears on the Control Dis-
play. The Flat Tire Monitor has a mal-
function or has failed. Have the system checked
as soon as possible.
Active steering*
The concept
The active steering is a system that actively var-
ies the steering angle of the front wheels in rela-
tion to the steering wheel movements.
A t l o w s p e e d , e . g . i n a t o w n o r w h e n p a r k i n g , t h e
steering angle of the wheels is reinforced, i.e.
the steering becomes very direct.
In the higher speed range, on the other hand,
the steering angle is reduced more and more.
This improves the handling capability of your
BMW over the entire speed range.
In critical situations, the system can make tar-
geted corrections to the steering angle pro-
vided by the driver and thus stabilize the vehicle
before the driver intervenes. This stability-pro-
moting intervention is deactivated when DSC is
switched off, refer to page82.
Malfunction
The warning lamp lights up. The active
steering is no longer operational. At low
speed, larger steering wheel move-
ments are required, while the vehicle reacts
more sensitively to steering wheel movements
in the higher road-speed range. Have the sys-
tem checked.
If the warning lamp lights up during the first
engine starting following a power supply inter-
ruption, the system must be activated by being
initialized.

Driving tips
109Reference
At a glance
Controls
Communications
Navigation
Entertainment
Mobility
Mobile communication devices in
vehicle
BMW advises against using mobile com-
munication devices, e.g. portable phones,
inside the vehicle without a direct connection to
an external antenna. Otherwise, the vehicle
electronics and mobile communication device
can influence one another. In addition, there is
no assurance that the radiation emitted during
transmission will be conveyed out of the vehicle
interior.<
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 sur-
face. This phenomenon is referred to as hydro-
planing, and is characterized by a partial or
complete loss of contact between the tires and
the road surface, ultimately undermining your
ability to steer and brake the vehicle.<
The risk of hydroplaning increases as the tread
depth of the tires decreases, also refer to Mini-
mum tire tread on page171.
Driving through water
Do not drive through water on the road if it
is deeper than 1 ft/30 cm, and then only at
walking speed at the most. Otherwise, the vehi-
cle's engine, the electrical systems and the
transmission may be damaged.<
Using handbrake on inclines.
On inclines, do not hold the vehicle with
the clutch; use the handbrake. Otherwise
greater clutch wear will result.<
SMG Sequential manual transmission
Start off quickly on slopes. Do not hold
the vehicle on a hill by applying the throt-
tle, but engage the handbrake instead. Other-
wise overheating can occur in the transmission
region.<
Braking safely
Your BMW is equipped with ABS as standard. In
situations that require it, it is best to brake with
full force. Since the vehicle maintains steering
responsiveness, you can still avoid possible
obstacles with a minimum of steering effort.
Pulsation at the brake pedal combines with
sounds from the hydraulic circuits to indicate to
the driver that ABS is in its active mode.
Do not drive with your foot resting on the
brake pedal. Even light but consistent
pedal pressure can lead to high temperatures,
brake wear and possibly even brake failure.<
Driving in wet conditions
When driving on wet roads or in heavy rain,
briefly brake with light pedal pressure at inter-
vals of a few miles. Monitor traffic conditions to
ensure that this maneuver does not endanger
other road users. The heat generated in this
process helps dry the pads and rotors to ensure
that full braking efficiency will then be available
when you need it.
Hills
To prevent overheating and thus reduced
efficiency of the brake system, downshift
to a gear in which only minimal brake applica-
tions are needed when descending long or
steep downhill stretches. Even light but consis-
tent pedal pressure can lead to high tempera-
tures, brake wear and possibly even brake fail-
ure.<
You can further enhance the engine's braking
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 page58. This strategy helps you avoid
placing excessive loads on the brake system.
Never drive with the clutch pressed
or allow the vehicle to coast with the
transmission in Neutral – or with the engine
switched off – there is no engine braking when
the transmission is in Neutral, and no power
assist for brakes and steering when the engine
is not running.

Replacing components
184
Power failure
Following a temporary interruption of the power
supply, the operation of some equipment is lim-
ited and must be reinitialized. Individual settings
are also lost and have to be updated:
>Active steering
The system is deactivated and has to be ini-
tialized, refer to page86. Until then, the
steering will react in an unaccustomed
manner.
>Seat, mirror and steering wheel memory
The position must be stored again, refer to
page46.
>Time and date
The settings must be updated, refer to
page78.
>Radio
Radio stations have to be stored again, refer
to page138.
>Navigation system
You must wait until it becomes operational
again, refer to page129.
Fuses
Never attempt to repair a blown fuse, and
do not replace a defective fuse with a sub-
stitute of another color or amperage rating, as
this could lead to overloading of the wiring, ulti-
mately resulting in a fire in the vehicle.<
Spare fuses and a pair of plastic tweezers are
located in the compartment for the onboard tool
kit, refer to page180.
Information on fuse allocation is located below
the bracket for the onboard tool kit, see below.
In glove compartment
1.Press the button on the back in the center of
partition1 and pull out the partition upward,
arrow2.
2.Press the coupling downward, arrow3, and
fold the lid 4 forward.
In luggage compartment
Fold up the cover under the floor mat and
remove the bracket for the onboard tool kit.
Information on fuse allocation1 and additional
fuses2 are provided there.

Giving and receiving assistance
188
Towing and tow-starting
Always observe all applicable towing laws
and regulations.<
Never allow passengers to ride in a towed
vehicle for any reason.<
Use tow fitting
The threaded tow fitting is stored in the tool kit
mounted on the inside of the luggage compart-
ment under the floor mat, refer to page180, and
should always remain in the vehicle. It can be
screwed in at the front or rear of the BMW.
To avoid damage to the tow fitting and the
vehicle, observe the following: only use
the tow fitting that comes with the vehicle and
screw it in as far as possible. Use the tow fitting
for towing only on roads. Avoid lateral strains on
the tow fitting, e.g. do not the lift vehicle by the
tow fitting.<
Access to screw thread
Rectangular cover in bumper:
Press the arrow symbol of the cover.
Front
Rear
Being towed
Make sure that the ignition key is in posi-
tion 1, as otherwise the steering wheel
could lock and it would be impossible to steer
the vehicle. There is no power assist with the
engine stopped. This then requires increased
effort for braking and steering. Active steering is
deactivated and larger steering wheel move-
ments are required.<
Switch on the hazard warning flashers depend-
ing on the local regulations. If the electrical sys-
tem fails, mark the vehicle to be towed, e.g. with
a sign or warning triangle in the rear window.
Vehicles with manual transmission
Gearshift lever in idle position
Vehicles with automatic transmission
Selector lever in position N.
Do not exceed a towing speed of 45 mph/
70 km/h and a towing distance of
90 miles/150 km, as otherwise the automatic
transmission may be damaged.<
Vehicles with SMG Sequential manual
transmission
With the ignition switched on, engage selector-
lever position N, then switch off the ignition.
Towing methods
In some countries, towing with tow bars or
ropes in public traffic is not permitted.
Familiarize yourself with the regulations on tow-
ing in the respective country.
With tow bar
The towing vehicle may not be lighter
than the vehicle to be towed, as otherwise
it will not be possible to control vehicle
response.<
The tow fittings used should be on the same
side on both vehicles. Should it prove impossi-
ble to avoid mounting the tow bar at an offset
angle, please observe the following:
>Clearance and maneuvering capability will
be strictly limited during cornering.

199Reference
At a glance
Controls
Driving tips
Communications
Navigation
Entertainment
Mobility
Everything from A to Z
Index
"..." Identifies Control Display
texts used to select
individual functions,
pointing out where these are
located.
A
ABS Antilock Brake
System81
– indicator lamp83
– malfunction83
ACC, refer to Active cruise
control62
Acceleration assistant with
SMG59
Accessories, refer to Your
individual vehicle5
Activated-charcoal filter97
"Activation time" for
independent ventilation98
Active cruise control62
– indicator lamps64
– malfunction68
– selecting distance65
Active roll stabilization83
Active steering85
– initializing system86
– warning lamp85
Adapting temperature in
upper body region97
Adaptive brake lamps, refer to
Brake Force Display86
Adaptive Head Light92
"Add digits" for portable
phone153
"Address book" for
navigation120
Address for navigation
– deleting121
– entering115
– selecting120
– storing current position120"Add to destination list"117
Adhesive bandages, refer to
First-aid kit186
Adjusting the temperature
with automatic climate
control95
Adjusting the thigh support45
Adjusting tone during audio
operation, refer to Tone
control133
"After opening door"46
"After unlocking"46
Airbags86
– deactivating, Coupe52
– sitting safely44
– warning lamp87
Air distribution
– automatic95
– manual96
Airing, refer to Ventilation97
Air recirculation, refer to AUC
Automatic recirculated-air
control95
"Air recirculation on / off"51
Air vents, refer to
Ventilation94
Air volume95
AKI, refer to Fuel
specifications167
Alarm system34
– avoiding unintentional
alarms35
– interior motion sensor35
– switching off alarm34
– switching off tilt alarm
sensor and interior motion
sensor35
– tilt alarm sensor35
All around the center
console14
All around the steering
wheel10
"All channels"141"All doors"29
All-season tires, refer to
Winter tires172
"AM", reception
range133,136
Antenna for portable
phone150
Antifreeze
– coolant176
– washer fluid61
Antilock Brake System
ABS81
– indicator lamp83
Anti-theft alarm system, refer
to Alarm system34
Anti-theft system29
Anti-trapping mechanism
– glass sunroof38
– power windows37
Approved axle loads, refer to
Weights192
Approved gross vehicle
weight, refer to Weights192
Armrest, refer to Center
armrest102
Arrival time
– refer to Computer75
– refer to Starting destination
guidance124
"Arrow display" during
Navigation127
Ashtray103
Assist, refer to BMW
Assist159
Assistance systems, refer to
Driving stability control
systems81
Assistance window20
"Assist. window off"21
AUC Automatic recirculated-
air control95
"Audio"133

Everything from A to Z
206 Inflation pressure, refer to Tire
inflation pressure168
Inflation pressure monitoring,
refer to Flat Tire Monitor84
Information
– on another location118
– on current position118
– on destination location118
"Information" for
navigation118
"Information on
destination"119
Initializing, refer to Power
failure184
"Input map"118
Inside rearview mirror,
automatically dimming, refer
to Automatic functions50
Installation location
– CD changer145
– navigation drive114
Instructions for navigation
system, refer to Voice
instructions126
Instrument cluster12
Instrument illumination, refer
to Instrument lighting93
Instrument lighting93
Instrument panel, refer to
Instrument cluster12
Integrated universal remote
control100
Interesting destination118
"Interim time"77
Interior lamps93
– remote control30
Interlock, refer to Steering
locked54
Interlock on automatic
transmission54
Intermittent mode of the
wipers60
J
Jacking points183
Joystick, refer to Control
Center16
Jumpering, refer to Jump
starting186
Jumping, refer to Jump
starting186
Jump starting186
K
Key Memory28
"Keypad"155
Keys28
Kick-down
– automatic transmission with
Steptronic58
– SMG Sequential manual
transmission57
Knock control167
L
Lamps, refer to Parking lamps/
low beams91
Lamps and bulbs180
"Languages"78
"Languages" for
navigation126
Lashing eyes, refer to
Securing load111
Last destinations, refer to
Destination list119
"Last seat pos."46
LATCH child-restraint fixing
system53
LEDs Light-emitting
diodes183
Length, refer to
Dimensions193
Letter symbol with portable
phone155
License plate lamps, replacing
bulbs182
"Light"60,91
Light-emitting diodes
LEDs183Lighter103
Lighter socket103
Lighting
– instruments93
– of the vehicle, refer to
Lamps91
Lights on warning91
Light switch91
"Limit"76
"Lock after driving"32
Lock buttons in the doors,
refer to Locking32
Locking
– from inside32
– from outside30
Locking and unlocking doors
– from inside31
– from outside29
"LOGIC7", refer to Tone
control134
Low beams91
– automatic91
– replacing bulbs180
Lower back support, refer to
Lumbar support45
Luggage compartment
– capacity192
– emergency release33
– hotel function32
– increasing capacity,
Convertible34
– opening/closing, refer to
Luggage compartment
lid33
– opening from inside33
– opening from outside33
– opening with remote
control30
Luggage compartment lid32
– emergency operation33
– emergency release33
– opening from inside33
– opening from outside33
– opening with remote
control30
– unlocking manually33
Lumbar support45
LW, waveband136