2000 BMW 323Ci CONVERTIBLE ECU

114n
Antilock Brake System (ABS)The concept ABS enhances active driving safety
by helping to prevent the wheels from
locking while braking. This is because
locked wheels are dangerous. When
the front wheels slide, the driver loses
steering control over the vehicle.
Traction loss at the rear wheels can
cause the rear end to break into an
uncontrolled skid.
ABS is designed to meet two essential
requirements during every brake appli-
cation:
>To help provide vehicle stability
>To help maintain steering control and
maneuverability – on all types of road
surfaces (asphalt, concrete, mud, wet
road surfaces, snow, ice).
The system can achieve the shortest
braking distances possible under most
conditions (on straight aways and in
curves, on asphalt, ice, wet road sur-
faces, etc.).
Braking with ABSThe system is operative once the vehi-
cle exceeds a speed of approx. 6 mph
(10 km/h). It is deactivated once again
below approx. 4 mph (6 km/h). This
means that the wheels can lock in the
final phase of a panic stop – a factor of
no significance in actual use.
If you are in a situation that requires full
braking, you will exploit the full benefits
of the ABS system if you apply maxi-
mum brake pressure ("panic stop").
Since the vehicle maintains steering
responsiveness, you can nevertheless
avoid possible obstacles with a mini-
mum of steering effort.
The ABS closed-loop control circuit
cycles in fractions of a second. A pulsa-
tion at the brake pedal, together with
the sounds associated with the hydrau-
lic controls, tells you that the brake sys-
tem is within its maximum limit range,
and reminds you that you should adapt
road speed to the road conditions.
On road surfaces that have a loose
surface layer on a firm base with good
traction (on gravel or snow, for exam-
ple), or when snow chains are mounted,
braking distances may be longer than
with locked wheels. However, ABS continues to provide
enhanced vehicle stability and steering
response under these conditions.
Information for your safetyNot even ABS can suspend the laws of
physics. ABS cannot prevent the conse-
quences of brake applications with inad-
equate clearances for safety between
vehicles, when exceeding the speed
limit in curves, or the risks involved
when aquaplaning occurs. Responsibil-
ity for these types of situations remains
in the hands (and at the feet) of the
driver. You should never allow the
added safety of ABS to lull you into a
false sense of security, or mislead you
into taking increased risks that could
affect your own safety and that of others.
Do not make any modifications to
the ABS system.
Service procedures on ABS are to be
performed by authorized technicians
only.<

122n
Hardtop
*
4 Open both front locking levers. To do
this press the buttons. The levers will
loosen somewhat. Flip the levers
open until they hit the stop46cde0089
5 Fold the cover panels that are on
the right and left side and below the
interior lamps downward before
mounting the hardtop. Press against
the small bulge on the cover panel.
There is a bracket in the cover panel
for secure storage of the the trim
pieces that have been removed (1)
6 Open the red locking lever all the
way (2)
7 Position the hardtop onto the sup-
ports with the help of a second per-
son. Be sure to place the supports
right in the brackets provided
8 In the back, close the red locking
levers by turning them inward until
they hit the stop behind the trim. Fold
the cover panels back 46cde077
9 To lock the hardtop in front, keep
closing the front locking levers until
you hear them engage.
Raise the hardtop carefully. Be
very careful not to displace the
seals. Seals that have been accidentally
displaced or pulled out lead to leaks.cRemovingRemove the hardtop in the opposite
order of installation.

129n
IndexDataTechnologyRepairsCar careControlsOverview
To unlock Pull the lever located under the left-
hand side of the dashboard.
Do not work on your vehicle with-
out appropriate skills. Always
switch off the engine and allow it to
cool down before working in the engine
compartment. Always disconnect the
battery before working on any electrical
systems or equipment, especially when
these are located within the engine
compartment. Comply with all applica-
ble instructions and warnings. Failure to
work in an informed, professional man-
ner when servicing components and
materials constitutes a safety hazard
for vehicle occupants and other road
users. If you are not familiar with the
guidelines, please have the operations
performed by your BMW center.<460us012
To openPull the release handle and open the
hood.462de269
To closeAllow the hood to fall from a height of
about 12 in (30 cm) so that it audibly
engages.
To avoid injuries, be sure that the
travel path of the hood is clear
when it is being closed, as with all
closing procedures. If it is determined
that the hood is not completely closed
while driving, stop immediately and
close it securely.<462de270
Hood

143n
IndexDataTechnologyRepairsCar careControlsOverview
Caring for your vehicleThe buildup of an electrostatic charge
on the seat covers, particularly if atmo-
spheric humidity is low, can give the
occupants an unpleasant electric shock
if they touch metal body parts after leav-
ing the vehicle. Although this not dan-
gerous in any way, it can be avoided by
touching a bare or polished metal part
of the vehicle while getting out.Leather care The leather upholstery
* used by BMW
is a natural product of the highest qual-
ity, processed using state-of-the-art
methods to ensure that it will maintain
its high quality for years to come, pro-
vided that it is properly cared for.
Because this product is manufactured
using natural materials, you must make
allowance for its special characteristics
and for the peculiarities of its use
and care.
Regular periodic cleaning and care are
essential, as dust and road dirt act as
abrasives in the pores and creases of
the material. This leads to wear spots
and premature brittleness on the sur-
face of the leather. We therefore sug-
gest that you clean the leather with a
vacuum cleaner or cloth at frequent
intervals.For cleaning, use BMW leather
cleaning foam.
Since dirt and grease gradually attack
the protective layer of the leather, the
cleaned surfaces should be treated
with BMW leather care agent. This also
acts as an antistatic agent.
For protection against dampness or
moisture, treat the leather with an im-
pregnating agent made by BMW.
We recommend that you perform this
procedure twice a year on leather
exposed to normal use.
Spills should be wiped up immediately.
Remove grease and oil stains by dab-
bing with spot remover. Avoid rubbing.
If the upholstery is to be exposed to in-
tense sunlight or if the vehicle is to be
stored for an extended period, cover all
leather surfaces (or, better yet, the win-
dows) to prevent fading.
Use the cleaning and car-care
products available at your BMW
center.<
Cleaning agents can contain sub-
stances that are dangerous or
pose health risks. For this reason,
always comply with the warnings and
danger labels on the packaging.
When cleaning the vehicle's interior,
open the doors or windows (if the con-
vertible top has been closed). Never
clean your vehicle with solvents or
other materials not specifically in-
tended for this purpose.<

160n
Changing a wheel>Space-saver spare tire
Located next to the jack.
Loosen the wing nut (arrow) by hand,
remove the storage tray and take out
the spare wheel
>Lug wrench – is in the onboard tool
kit on the underside of the luggage
compartment lid (refer to page 152).46cde039
Procedure1 Read and comply with the safety
precautions provided on the previ-
ous page
2 Secure the vehicle against rolling:
Place the wedge against the rear
surface of the front tire on the side
opposite the side being raised. If
the vehicle is parked on a down-
ward slope, place the wedge se-
curely in front of the tire. If the
wheel must be changed on a sur-
face with a more severe slope, take
additional precautions to secure the
vehicle against rolling
3 If your wheels are equipped with full
wheel covers
*, reach into the venti-
lation openings and pull the cover
off
46cde055
4 Loosen the lug bolts 1/2 turn
5 Position the jack at the jacking point
closest to the flat tire (refer to the
center illustration) so that the jack
base is vertically below the jacking
point and the entire surface of the
head of the jack will move into the
square recess of the jacking point
(refer to the illustration detail) when
the jack is cranked
6 Jack the vehicle up until the wheel
you are changing is raised from the
ground
7 Unscrew the lug bolts and remove
the wheel
8 Remove mud or dirt accumulations
from the mounting surfaces of the
wheel and hub. Clean the lug bolts462de252

161n
IndexDataTechnologyRepairsCar careControlsOverview
Changing a wheel9 Position the new wheel or the
space-saver spare tire on the hub
and screw at least two lug bolts fin-
ger-tight into opposite bolt holes
10 Screw in the remaining lug bolts.
Tighten all the bolts snugly
11 Lower the jack and remove it from
beneath the vehicle
12 Tighten the lug bolts in a diagonal
pattern462de266
13 If your wheels are equipped with full
wheel covers
*, place the wheel
cover with the valve opening over
the valve (arrow). Use both hands to
press the cover securely onto the
rim
14 Check and correct the tire's inflation
pressure at the earliest possibility.
For vehicles with RDC (Tire Pres-
sure Control)*:
After mounting the space-saver
spare tire or correcting the inflation
pressure, reactivate the system.
Refer to page 89.
Only use original BMW full wheel
covers, otherwise, the trim piece
may not fit securely. The full wheel
cover may not be installed on the
space-saver spare tire, since this could
damage the cover.<
462de279
The vehicle jack is designed for
changing wheels only. Do not at-
tempt to raise another vehicle model
with it or to raise any load of any kind.
To do so could cause accidents and
personal injury.
To ensure continued safety, have the
solid fit of the lug bolts [torque: 72 lbft
(100 Nm)] checked using a calibrated
torque wrench.<
When storing the wheel, take care to
ensure that you do not damage the
retaining pin in the spare tire recess.
If light-alloy wheels other than original
BMW light-alloy wheels have been
mounted, it may be necessary to use
different lug bolts for those wheels.
Replace the defective tire as soon as
possible and have the new wheel/tire
balanced.

164n
BatteryRemoval and installation
Do not disconnect the battery when
the engine is running. If you do so,
the ensuing voltage surge will damage
the vehicle's onboard electronics.
Do not make any modifications in the
wires to the positive terminal. If you do
so, the protective function of the safety
battery terminal is no longer ensured.
Repair and disposal must be performed
by trained technicians only.<
When removing the battery, disconnect
the cable on the negative terminal first,
then the cable on the positive terminal.
Loosen the center adjusting screw on
the battery retaining strap (use the
screwdriver included with the onboard
tool kit) and disconnect the strap.
When installing a battery, connect the
positive terminal first, then connect the
negative terminal.
When installing a battery, be sure
that it is mounted properly and that
the retaining bracket is installed with the
center adjustment screw, otherwise, the
battery will not be adequately secured
in case of an accident.<
Charging the battery Charge the battery in the vehicle only
when the engine is not running.
Before performing any work on
the electrical system, be sure to
unclamp the cable from the battery's
negative terminal. Failure to do so can
result in short-circuits, a fire or per-
sonal injury.<
If you plan to park the vehicle for longer
than 4 weeks, disconnect the battery
from the vehicle's electrical system by
disconnecting the cable at the negative
terminal. Then recharge the battery with
an appropriate battery charger.
If you intend to store the vehicle for
longer than 12 weeks, remove the bat-
tery, charge it and store it in a cool and
dust-free room where there is no dan-
ger of freezing. During storage, have
the battery recharged every 3 months.
Also, recharge the battery before it is
reinstalled. If this is not done, the bat-
tery will not be serviceable. Every time
the battery is drained, especially over
extended periods, its service life is
reduced.
Return used batteries to a recy-
cling point or your BMW center.
Maintain the battery in an upright posi-
tion for transport and storage. Secure
the battery to prevent it from tilting
during transport.<
Storage periods during which
the battery is disconnected are
not taken into consideration by the
Service Interval Display for changing
the brake fluid.
For this reason, be sure that the brake
fluid is changed every two years, re-
gardless of the information displayed.
Read and comply with the information
on page 136 covering this subject.<

Everything from A to ZFuel consumption
display83
Fuel reserve indicator
lamp83
Fuel tank capacity185
Fuel tank gauge83
Fully automatic convertible
top
actuation49
emergency closure166
one-touch operation34
Functional status178
Fuses165GGarage-door opener100
Gasoline27
Gasoline gauge83
Glove compartment99
Glove compartment lamp
bulb replacement158
Grills94
Gross vehicle weight184HHandbrake72
Hands-free system103
Hanging the luggage
compartment floor up by
the hook40
Hardtop121
Hazard warning flashers25Hazard warning triangle25
Head restraints54
Headlamp covers,
care139, 153
Headlamp flasher92
Headlamp washer
system79, 132, 185
Heated seats99
Heater and ventilation94
Heavy loads106
Height183
High beams23, 77, 92
bulb replacement153
Hood release129
Horn17
Hub cap160
IIce warning85
Identification, tires126
Ignition key32
Ignition lock70
Increasing the space in the
luggage compartment41
Indicator lamps20
Inflated pressure27, 123
Inflation pressure
monitoring89, 177
INSPECTION83
Instrument cluster18
Instrument lighting91Interaxle tire rotation125
Interface socket for On-
Board Diagnostics149
Interference
cellular phones120
Interior lamps37, 92
bulb replacement157
remote control37
Interior rearview mirror,
automatic dimming
feature59, 175
Interlock70
Intermittent wipe77
ISOFIX Attachment of the
child seat62
JJack159
Jets94
Jump starting168KKey32
Key Memory60
Key with remote control32L"Lamps on" warning91
Lashing eyes107
Leather care143
Length183License plate lamp
bulb replacement157
Light switch91
Light-alloy wheels128
Lighter104
Load-securing devices107
Low beams91
bulb replacement153
Lug bolts160
Luggage compartment39
capacity184
emergency release39
floor panel41
remote control37
Luggage compartment
lamps
bulb replacement158
Luggage compartment
lid39
emergency release39
Luggage compartment
lighting39
Luggage rack108
Lumbar support56
MM+S tires127
Maintenance83, 138
Malfunction displays84
Manual convertible top
operation in the event of an
electrical malfunction166