2004 BMW 645CI COUPE Engine

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1.Push a screwdriver from the left under
the lamp and lever up the lamp to the
right
2.Turn the bulb holder 905 to the left and
remove
3.Remove and replace the bulb.
Light-emitting diodes LEDs
Light-emitting diodes installed behind
translucent lenses serve as the light source
for many of the controls and displays in
your vehicle. These light-emitting diodes,
which operate using a concept similar to
that applied in conventional lasers, are offi-
cially designated as Class 1 light-emitting
diodes.
Do not remove the covers, and never
stare into the unfiltered light several
hours, as irritation of the retina could
result.<
Changing a wheel
Your BMW is equipped with run-flat tires as
standard. An immediate wheel change in
the event of a flat tire is therefore no longer
required.
You will recognize run-flat tires by a circular
symbol containing the letters RSC on the
side of the tire, refer to Run-flat tires on
page 167.
If you switch from summer to winter tires,
or vice versa, use only run-flat tires, as in
the event of a flat there is no spare tire
available. Your BMW center will be glad to
advise you.
Also refer to New wheels and tires,
page 168.
Car jacking points
The jacking points for the car jack are
located in the positions shown.
You can obtain a suitable car jack as
an accessory at your BMW center.<
Battery
Battery care
The battery is 100 % maintenance-free, i.e.,
the electrolyte will last for the life of the bat-
tery when the vehicle is operated in a tem-
perate climate.
Your BMW center will be glad to advise in
all matters concerning the battery.
Charging battery
Only charge the battery in the vehicle via
the terminals in the engine compartment
with the engine switched off. For the con-
nections, refer to Jump-starting on
page 184.
Disposal
Have old batteries disposed of by
your BMW center or hand them in to a
recycling center. Maintain the battery in an
upright position for transport and storage.
Always restrain the battery to prevent it
from tipping over during transport.<
Power cut
After a temporary power cut, e.g. with a
discharged battery, the features of some
equipment are limited and it has to be rein-
itialized. Individual settings are also lost
and have to be updated:

Giving and receiving assistance
184
Warning triangle*
The warning triangle can be found in the
luggage compartment on the left side.
Comply with legal requirements
requiring you to carry a hazard warn-
ing triangle in the vehicle.<
First-aid kit*
The first-aid kit is located in the filler ele-
ment of the rear seat backrest.
1.Press the button downwards
2.Remove the filler element in a forward
direction
3.Remove the first-aid kit.To refit the filler element, insert the
two steps in the strip and press back
the filler element. Make sure that you do
not damage the rear seat upholstery.<
Some of the articles contained in the
first-aid kit have a limited service life.
For this reason, check the expiration dates
of each of the items regularly and replace
any whose expiration dates have passed.
You can find replacements in any phar-
macy.
Comply with legal requirements requiring
you to carry a first-aid kit in the vehicle.<
Roadside Assistance*
The Roadside Assistance of the BMW
Group offers you breakdown assistance
around the clock, including on weekends
and public holidays.
The phone numbers of the Roadside Assis-
tance in your home country can be found in
the BMW Dealer Directory.
In the case of vehicles with BMW Assist or
TeleService, you can call the Roadside
Assistance of the BMW Group directly for
breakdown assistance via the Control Cen-
ter, refer to page 156.
Jump-starting
When your battery is discharged, you can
use two jumper cables to start your BMW
with power from the battery in a second
vehicle. You can also use the same method
to help start another vehicle. Use only
jumper cables with fully-insulated clamp
handles.
To avoid the risk of potentially fatal
injury, always avoid all contact with
electrical components while the engine is
running. Carefully adhere to the following
sequence, both to prevent damage to one
or both vehicles, and to guard against pos-
sible personal injuries.<

Mobility
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Preparing
1.Check whether the battery of the other
vehicle has a voltage of 12 Volts and
approximately the same capacitance
in Ah. This information can be found on
the battery
2.Switch off the engine of the vehicle pro-
viding assistance
3.Switch off any consumer units in both
vehicles.
There must not be any contact
between the bodies of the two vehi-
cles, as otherwise there is a danger of
shorting.<
Connecting jumper cables
To avoid personal injury from sparks,
always observe this sequence when
connecting jumper cables.<
On your BMW, the so-called starting-aid
terminal in the engine compartment serves
as the battery positive terminal, also refer
to engine compartment essentials on
page 171. The symbol + is embossed on
the cover.
1.Fold open the cover of the BMW start-
ing-aid terminal. To do so, pull the tab
2.Attach one end of the jumper cable
plus/+ to the positive terminal of the
battery or a starting-aid terminal of the
vehicle providing assistance
3.Attach the second end of the cable to
the positive terminal of the battery or to
a starting-aid terminal of the vehicle to
be startedYour BMW has a special nut as body
ground or negative pole.
4.Attach one end of the jumper cable
minus/– to the negative terminal of the
battery or to an engine or body ground
of the vehicle providing assistance
5.Attach the second end of the cable to
the negative terminal of the battery or to
the engine or body ground of the vehi-
cle to be started.
Starting engine
1.Start the engine on the support vehicle
and allow it to run for several minutes at
increased speed
2.Start the engine on the other vehicle in
the usual way.
If the first start attempt is not success-
ful, wait a few minutes before another
attempt in order to allow the discharged
battery to recharge
3.Let the engines run for a few minutes
4.Disconnect the jumper cables by
reversing the connection sequence
If required, have the battery inspected and
recharged at your BMW center.
Never use spray fluids to start the
engine.<
Towing and tow-starting
Always observe all applicable towing
laws and regulations.<
Never allow passengers to ride in a
towed vehicle for any reason.<

Giving and receiving assistance
186
Using tow fitting
The threaded tow fitting is stored in the tool
kit mounted on the inside of the luggage
compartment under the floor mat, refer to
page 178, 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 follow-
ing: only use the tow fitting that comes with
the vehicle and screw it in as far as possi-
ble. Only use the tow fitting to tow on the
roadway. Avoid heavy lateral loading of the
tow fitting, e.g. do not lift the vehicle by the
tow fitting.<
Access to screw thread
Rectangular cover in bumper:
Press the arrow symbol of the cover.
Front
Rear
Being towed
Even if there is a failure in the electri-
cal system, make sure that the igni-
tion key is in position 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. The active steering is deacti-
vated; when stopped and in the low speed
range greater steering wheel movements
are required.<
Switch on the hazard warning flashers
depending on the local regulations. If the
electrical system fails, mark the vehicle to
be towed, e.g. with a sign or warning trian-
gle 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 dis-
tance of 90 miles/150 km, as otherwise the
automatic transmission may be dam-
aged.<
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 all regulations on
towing in the respective country.
With tow bar
The towing vehicle may not be lighter
than the vehicle to be towed, as oth-
erwise 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
impossible to avoid mounting the tow bar
at an offset angle, please observe the fol-
lowing:
>Clearance and maneuvering capability
will be strictly limited in corners

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>When mounted at an angle, the tow bar
will exert lateral forces, tending to push
the vehicle sideways.
Secure the tow bar on the tow fitting
only. Otherwise damage could result
on other vehicle parts.<
With tow-rope
When starting off in the towing vehicle,
make sure that the tow-rope is taut.
To avoid jerking and the associated
stresses on vehicle components
when towing, always use nylon ropes or
nylon straps. Secure the tow rope on the
tow fitting only. Otherwise damage could
result on other vehicle parts.<
With tow truck
Have the BMW transported with a tow
truck with a so-called lift bar or on a load
bed.
Do not lift vehicle by tow fitting or
body and chassis parts, as otherwise
damage may result.<
Tow-starting
Do not tow-start vehicles with an
automatic transmission.
Jump-starting, refer to page 184.<
Only tow-start vehicles with a catalytic
converter with the engine cold. It is better
to jump-start the engine, refer to page 184.
1.Switch on the hazard warning flashers,
comply with country-specific regula-
tions
2.Turn the ignition key to position 23.Engage the 3rd gear, vehicles with
SMG, see below
4.Have the vehicle tow-started with the
clutch pedal completely depressed and
slowly release the clutch. After the
engine starts, depress the clutch pedal
completely again
5.Stop at a suitable location, remove the
tow bar or rope and switch off the haz-
ard warning flashers
6.Have the vehicle checked.
Vehicles with SMG Sequential manual
transmission:
1.Tow-start in selector lever position N
2.Select sequential mode. The correct
gear will be selected and engaged
automatically.

Technical data
190
Technical data
Engine specifications
Weights
Never exceed either the approved
axle loads or the gross vehicle weight.
645Ci
Displacement
Number of cylinderscu in/cmm268.4/4,398
8
Maximum output
at engine speedhp
rpm325
6,100
Maximum torque
at engine speedlb ft/Nm
rpm 330/450
3,600
645Ci Coupe 645Ci Convertible
Curb weight
with manual transmission
with automatic transmission / SMGlbs./kg
3,781/1,715
3,792/1,7204,178/1,895
4,189/1,900
Approved gross weight
with manual transmission
with automatic transmission / SMGlbs./kg
4,619/2,095
4,630/2,1004,960/2,250
4,971/2,255
Load lbs./kg 838/380 772/350
Approved front axle load lbs./kg 2,271/1,030 2,381/1,080
Approved rear axle load lbs./kg 2,513/1,140 2,381/1,080
Luggage compartment capacity
Convertible: with convertible top com-
partment floor up, refer to page 32cu ft/l 15.9/450
–10.6/300
12.4/350

Reference 193
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Mobility
Capacities
Notes
Fuel tank
Reservegal/liters
gal/litersapprox. 18.5/70
approx. 2.1/8Fuel specification: page 163
Window and headlamp
washer system quarts/liters approx. 5.3/5For details: page 62
Engine oil and filter change quarts/liters 8.5/8 BMW High Performance
Synthetic Oil
Oil grades: page 172

Everything from A to Z
198 Automatic
– air distribution 89
– air volume 89
– cruise control 62
– curb monitor 45
– headlamp control 85
– service notification 156
– station search 131
– steering wheel
adjustment 49
– storing stations 132
Automatic car wash 102
– also refer to the Caring for
your vehicle brochure
Automatic climate
control 88
– automatic air
distribution 89
– convertible program 91
– settings using Control
Center 90
– switching off 90
"Automatic programs" 91
Automatic recirculated-air
control, AUC 89
Automatic transmission
with Steptronic 58
– convenience start 55
– Dynamic Driving
Control 59
– interlock 54
– kickdown 59
– selector lever interlock 58
– shiftlock 58
– starting engine 55
– towing 186
– tow-starting 187
– warning lamp 59
"Automatic ventilation" 92
AUTO program with
automatic climate
control 89
"Autostore" on the
radio 130, 132
"AUTO" with automatic
climate control 91
Average fuel
consumption 69
– setting units 72
Average speed 69"Avoid ferries" for
navigation 116
Avoid freeways for
navigation 116
"Avoid highways" for
navigation 116
Avoiding unintentional
alarms 33
"Avoid tollroads" for
navigation 116
Axle loads, refer to
Weights 190
"A - Z" 148
B
Backrests, refer to
Seats 43
Backup lamps, refer to
Reverse gear 56
– replacing the bulbs 180
Balance, refer to
Adjusting the tone 128
Balance adjustment in
audio mode
– right/left 128
Bass, refer to
Adjusting the tone 127
"Bass", refer to
Adjusting the tone 128
Battery 181
– in the remote control 26
– jump-starting 184
Being towed 186
Belts, refer to
Safety belts 47
Beverage holder, refer to
Cup holders 97
Black ice, refer to
Ice warning 64
Blower, refer to
Air volume 89
BMW Assist 155
– enabling 155
– services offered 156
BMW maintenance
system 174
"BMW Service" 157
"BMW Service
settings" 155Bore, refer to
Engine data 190
Bottle holder, refer to
Cup holders 97
Brake Assistant, refer to
DBC Dynamic Brake
Control 78
Brake fluid 173
– warning lamp 173
Brake Force Display 80
Brake hydraulic
system 173
Brake lamps
– replacing the bulbs 180
– two-stage brake lamps 80
Brake pads 173
– break-in procedure 102
Brake pedal, refer to
Brakes 103
Brake rotors 103
Brakes 103
– ABS Antilock Brake
System 76
– brake fluid 173
– Brake Force Display 80
– brake pads 102, 173
– break-in procedure 102
– handbrake 55
Brake system 102
– brake fluid level 173
– brake pads 173
– brake rotors 103
– break-in procedure 102
– warning lamp 13, 78, 173
Brake wear warning
– brake pads 173
– warning lamp 173
Breakdown assistance 156
Breakdown services, refer
to Roadside
Assistance 184
Breaking-in the clutch 102
Breaking-in the
differential 102
Break-in procedures 102
"Brightness" 72
Buttons on the steering
wheel 11