2003 BMW 540I SEDAN ECU

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OverviewControlsMaintenanceRepairsDataIndex
Safety beltsDrive with your safety belt onAlways fasten your safety belt before
starting off. As supplemental restraint
devices, the airbags are designed to
enhance the effectiveness of the safety
belts, and not to replace them.To closeMake sure you hear the catch engage in
the belt buckle.To open1. Press the red button in the belt
buckle
2. Hold the end of the belt
3. Guide the belt back into the inertia
reel.390de653
The shoulder belt anchor automatically
adjusts to continue providing an
optimum fit when you move the seat
forward or back.
The rear belt buckle with the word
"CENTER" is intended exclusively
for the passenger sitting in the middle.
sedan with through-loading system
*:
please comply with the instructions for
the center safety belt on page 121.
sport wagon: if it is not possible to
extract the center belt, this indicates
that the detent for the larger backrest is
not securely engaged, refer to
page 125.<
If the safety belt system has been
subjected to the stresses involved
in an accident or otherwise damaged:
to ensure that the safety belts continue
to provide effective protection, always
have the entire safety belt mechanism
replaced and the belt anchorages
inspected at your BMW center.
If a child-restraint system was in the
vehicle during an accident, consult the
manufacturer's instructions regarding
replacement.c

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Transporting children safelyCommercially-available child-restraint
systems are designed to be secured
with a lap belt or with the lap belt por-
tion of a combination lap/shoulder belt.
Improperly or inadequately installed
restraint systems can increase the risk
of injury to children. Always read and
follow the instructions that come with
the system.
Child-restraint system with tether
strap If you use a child-restraint system with
a tether strap, three additional tether
anchorage points have been provided Ð
refer to the arrows in the illustrations.
Depending on the location selected for
seating in the rear passenger area,
attach the tether strap to the corre-
sponding anchorage point to secure the
child-restraint system, as shown in the
following illustrations. 380us123
sport wagon:
To gain access to each anchor fitting lift
the plastic plug (arrows) with the help of
a screwdriver.392au001

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Transporting children safelyOlder children should be tightly secured
with a safety belt, after they have out-
grown a booster seat that is appro-
priate for their age, height and weight.
Younger children should be secured in
an appropriate forward-facing child-
restraint system that has first been
properly secured with a safety belt.
Never install a rearward-facing child-
restraint system in the front passenger
seat.
We strongly urge you to carefully read
and comply with the instructions for
installation and use provided by the
child-restraint's manufacturer whenever
you use such a system.
Be sure that all occupants (of all ages)
remain properly and securely restrained
at all times.<
All rear seating positions in your
vehicle meet the recommendations
of SAE J1819, an industry-recom-
mended practice for securing child-
restraint systems in motor vehicles.
Child-restraint installationAll of the rear belt retractors and the
front passenger's safety belt can be
locked for mounting and securing child-
restraint systems.
Information regarding this is located
near the buckle latch of each safety
belt.365us146
Lock the safety beltPull the entire length of the belt from
the belt retractor. Allow the reel to
retract the belt somewhat and engage
the buckle, then tighten the belt against
the child-restraint system. The retrac-
tion mechanism is now locked.Unlock the safety beltRelease the buckle, remove the child-
restraint device and allow the belt
retractor to reel the belt completely in.

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OverviewControlsMaintenanceRepairsDataIndex
Automatic transmission with Steptronic
*
You can drive as with a normal auto-
matic transmission. In addition, you can
also shift manually.
When you move the selector lever from
the "D" position to the left into the M/S
range, the performance-oriented shift
programs of the automatic transmission
are engaged. Steptronic enters the
manual selection mode and executes
the desired shift whenever you tap the
selector lever in the direction indicated
by "+" or "Ð." When you wish to use the
automatic transmission mode again,
move the selector lever to the right into
the "D" position.
Under normal operating conditions, fuel
consumption is lowest when driving in
position D.
Selector lever positions
P R N D M/S
Starting the engineThe engine can only be started in
selector lever positions P or N.390us607
Range selectionA detent prevents inadvertent shifts to
the "Reverse" or "Park" selector lever
positions. To disengage the detent,
press the button on the front side of
the selector lever knob (arrow).
While the vehicle is stationary and
before shifting out of "Park" or
"Neutral," depress the footbrake in
order to disengage the selector lever's
lock mechanism (Shiftlock).
Hold the footbrake down until starting
off. The vehicle will otherwise "creep"
when a drive position is engaged.< 390de718

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OverviewControlsMaintenanceRepairsDataIndex
Automatic transmission with Steptronic
*
ATC executes upshifts and downshifts
only when the new gear will provide a
suitable combination of vehicle and
engine speed, i.e., ATC will not execute
downshifts that would cause the engine
to overrev. The gear selected will
appear briefly in the instrument cluster
followed by the current gear.
If you are driving in the manual
mode and wish to accelerate
rapidly from low road speeds (when
passing, for instance), you must shift
down manually or with the "kickdown"
function.<
You can only change from "M/S" to
selector lever positions "P," "R," and
"N" via the "D" position.
Electronic transmission control
module
If the indicator lamp comes on
or the message "TRANS. FAIL-
SAFE PROG" appears in the
Check Control
*, there is a fault in the
transmission system.
Bring the vehicle to a stop. Move the
transmission selector lever to "P."
Engage the parking brake and turn the
engine off (ignition key to position 0).
Wait a few seconds, then start the
engine.
If the indicator lamp goes out after a
few seconds, normal transmission
performance has been restored. You
may continue to drive as usual. If the
indicator lamp does not go out, you can
place the selector lever in all positions.
However, the vehicle will now only drive
forward with limited gear selection.
If this happens, avoid extreme engine
loads and refer the problem to the
nearest BMW center.
Never perform work in the engine
compartment without first
ensuring that the transmission is in
"Park" or "Neutral" as the vehicle could
otherwise start to move off on its own.<
For jump-starting, towing and tow-
starting, refer to pages 164 and 165.

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OverviewControlsMaintenanceRepairsDataIndex
Check ControlGraphic display
*
The following alerts and status mes-
sages are displayed with icons from
ignition key position 2 and remain in the
display until the defects are corrected:
1 Check low beams
2 Add washer fluid (goes out after
approx. 1 minute)
3 Door open
4 Luggage compartment lid/tailgate
open
5 Check brake and tail lamps.
A defective center brake lamp is indi-
cated by the upper symbol
When you open the door after stopping,
a warning signal sounds without a
visual indicator for:
>"LIGHTS ON" and
>"KEY IN IGNITION LOCK."390de121
Alphanumeric display
*
Text messages are used to alert the
driver to system malfunctions when the
ignition key is turned to position 2. The
alert is accompanied by a gong.
1 Status messages symbol
2 Display
3 CHECK button
Messages warning of system malfunc-
tions are assigned one of two priority
levels:390us111
Priority 1
These defects are immediately indi-
cated by a gong and a flashing warning
symbol 1. Simultaneous defects will be
displayed consecutively. These status
messages remain in the display until the
defects are corrected. They cannot be
deleted by pressing the CHECK
button 3:

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OverviewControlsMaintenanceRepairsDataIndex
Check Control>"CHECK LOWBEAM LIGHTS"
"CHECK SIDE LIGHTS"
"CHECK REAR LIGHTS"
"CHECK FRONT FOGLAMPS"
"CHECK LICPLATE LIGHT"
"CHECK HIGHBEAM LIGHT"
"CHECK BACK UP LIGHTS"
Defective bulb or circuit. Refer to
pages 153 and following, page 162
or consult your BMW center
>"TRANS. FAILSAFE PROG"
Please consult the nearest BMW
center. Refer to pages 74 and 77
>"CHECK BRAKE LININGS"
Have the brake pads inspected by
your BMW center. Refer to page 134
>"CHECK COOLANT LEVEL"
Coolant too low, top up at the next
opportunity. Refer to page 144
>"ENGINE FAILSAFE PROG"
*
Indicates a malfunction in the elec-
tronic engine-management system,
which then reverts to an emergency
default program allowing continued
operation at reduced power and
lower engine speeds.
Please have the system inspected at
your BMW center.
Displays after completion of tripAll of the malfunctions registered during
the trip appear consecutively when the
ignition key is turned to position 0.
The following displays will appear when
appropriate:
>"LIGHTS ON"
>"KEY IN IGNITION LOCK"
>"CHECK ENGINE OIL LEV"
Add engine oil at the next opportunity
(next stop to refuel). Refer to
page 142.
This display appears when you open
the driver's door after parking the
vehicle. A supplementary gong is also
heard.
Status messages remain available for a
period of approx. three minutes after
the display goes out and the key is
removed from the ignition. Press the
CHECK button 3. If there were multiple
reports, press the CHECK button
repeatedly to view them all in
sequence.
To check the Check ControlPress the CHECK button 3 with the
ignition key in position 2:
CHECK CONTROL OK appears in the
display.
No malfunctions are present in the
monitored systems.ComputerYou can find a description of the com-
puter on pages 88 and 93 as well as in
the "Owner's Manual for Onboard Com-
puter."
You can have the Check Control
and computer messages
displayed in a different language.<

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Through-loading system
*
Fold the rear backrests downReach into the recess and pull forward
(arrow 1).
When you close the backrest, be sure
that the catch engages securely. The
red slide (arrow 2) must go underneath.394de745
The central safety belt has an additional
small buckle.
>If you connect the two belt sections,
you can use the central belt as any
normal 3-point belt
>It is easier to fold the rear-seat back-
rest up and down if you disconnect
the belt (arrow).394de746
With a master key, you can lock each
backrest in the rear seat.
This also prevents access to the lug-
gage compartment from the interior of
the vehicle if you turn over only your
door and ignition key 3 (refer to
page 32), for valet parking.394de747