2001 BMW 540I SEDAN battery

Index
Data
Technology
Repairs
Car care
Controls
Overview
193nChanging a wheel Battery
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.
Size 255/40 R17 94 W
* tires on
the rear axle:
In the event of a puncture or other tire
failure, it may be necessary to mount
the spare tire of different size at the
rear. This tire is of full capacity in all
load and speed ranges. Nevertheless,
mount a tire of the correct size as soon
as possible. <
Battery posts, terminals, and re-
lated accessories contain lead
and lead compounds. Wash hands after
handling. <
Installation location
The battery is located behind the right-
hand side trim panel in the luggage
compartment.
Fold the trim panel down with the
handle at the top. On the sport wagon,
press the button.
If a subwoofer
* is installed on the sport
wagon, loosen the T-screw and swing
the subwoofer to the side.
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Maintenance
The battery is absolutely maintenance-
free, that is, the original electrolyte will
normally last for the service life of the
battery under moderate climatic condi-
tions.
Symbols
You will find the following symbols on
your vehicle battery. To avoid injury,
please comply with the corresponding
precautions whenever you work with or
near the battery.
Please read the following infor-
mation before working with the
battery.
Wear eye protection. Do not al-
low particles containing battery
acid or lead to come into con-
tact with your eyes, your skin, or your
clothing.
Battery acid is extremely corro-
sive. Wear eye protection and
protective gloves. Do not tip the
battery. Battery acid can leak from the
ventilation openings.
Be sure that children keep well
away from batteries and battery
acid.

194nBattery
Never allow sparks or open
flame near the battery. Do not
smoke in the vicinity of the
battery. Avoid sparks from electrical
cables or electrical equipment. Turn the
key to position 0 in the steering lock
during the disconnection or connection
of the battery. Never short-circuit the
battery terminals. There is a danger of
injury from powerful sparks.
A highly-explosive gas is
generated when the battery is
charged.
If you happen to get acid in your
eyes, rinse thoroughly for
15 minutes with clear water.
Following that, consult a physician
immediately. If you get acid spray on
your skin or clothing, rinse with plenty
of water. If electrolyte is accidentally
swallowed, consult a physician immedi-
ately.
In order to protect the battery
case from ultraviolet radiation,
do not place it in direct sunlight.
A discharged battery can freeze. Store
the battery in areas where the tempera-
ture remains above freezing.
Charge condition
You can read the charge condition
of the battery with the "Magic Eye"
*
(a hydrometer):
> Green: adequate charge.
> Black: not charged adequately.
The battery must be recharged.
Please contact your BMW center.
> Yellow: replace the battery.
The projected service life of the
battery can only be reached if the
battery is fully-charged at all times.
Check the charge condition of the bat-
tery frequently if the vehicle is used pri-
marily for driving short distances. <
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Charging the battery
If the battery is charged in the vehicle:
Do not charge the battery with the
engine running.
Before performing any work on
the electrical system, disconnect
the cable from the negative terminal. If
you do not, short circuits can create the
risk of fire or personal injury. <
If you plan to store the vehicle for more
than four weeks, disconnect the battery
from the vehicle electrical system by
disconnecting the cable at the negative
terminal and then recharge using a suit-
able charging device.
If you intend to store your vehicle for
longer than 12 weeks: remove the bat-
tery, charge it and store it in a cool (but
frost and dust-free) room. Every three
months and before reinstalling the bat-
tery, have it recharged. If it is not
recharged, it will not be serviceable.
Every time the battery is discharged,
especially over extended periods, its
service life is reduced.

Index
Data
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Repairs
Car care
Controls
Overview
195nBattery
Return used batteries to a
recycling point or your authorized
BMW center. Maintain the battery in
an upright position for transport and
storage. Secure the battery against
falling over in transit. <
Removal and installation
Do not disconnect the battery
when the engine is running. Dis-
connecting the battery cable when the
engine is running will cause a voltage
surge which 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.
Repairs and disposal may only be
performed by specially-trained person-
nel. <
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When removing the battery, first dis-
connect the negative terminal, then the
positive terminal. Remove the protec-
tive bar 1 and unscrew the threaded
connection of the battery bracket 2.
When installing the battery, connect the
positive terminal first, then connect the
negative terminal.
When installing a battery, be sure
that it is mounted properly. Install
and secure the protective bar. If the
battery is not mounted and fastened
properly, it will not be adequately
secured in case of an accident. <

196nFuses
When an electrical accessory fails to
operate, switch it off and inspect the
fuse.
In the glove compartment
1 Open the glove compartment and
turn the two white quick-release
fasteners to the left. Spare fuses and
plastic tweezers are located on the
fuse holder.
2 Use the plastic tweezers to remove the fuse for the accessory or equip-
ment that has stopped working.
3 If the fuse is burned through (the
metal strip will have melted and
separated), replace it with a new fuse
of the same ampere rating (color
code).
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The fuses, their respective ampere rat-
ings and the equipment in their circuits
are all indicated below the fuse holder.
Close the fuse holder by holding the top
of the cover in place and screwing the
two quick-release fasteners to the right.
Additional fuses are provided in the
luggage compartment (refer to next
columns).
The fuse for continuous positive current
is located in a separate fuse box above
the battery. If this fuse is defective, re-
fer the problem to your BMW center for
repair. Do not attempt to repair a burned
fuse or replace it with a fuse
having a different color or ampere rat-
ing. To do this could cause a fire in the
vehicle resulting from a circuit over-
load. <
If the fuse fails repeatedly, refer the
problem to your BMW center for repair.

200n
Never use spray starter fluids.
If the battery is discharged, the engine
can be started with the use of two
jumper cables and the battery of
another vehicle. Always use jumper
cables with fully insulated handles on
the terminal clamps. Do not touch high-voltage wiring
and cables on a running engine.
There is a risk of fatal injury if you do
this. <
Carefully comply with the following in-
structions to avoid personal injury and
damage to one or both vehicles:
1 Ensure that the battery on the sup- port vehicle is also rated at 12 volts,
and that the capacities of the two
batteries (Ah) are roughly comparable
(printed on casing).
2 Leave the discharged battery connected to the vehicle electrical
system.
3 Make sure that there is no contact between the bodywork of the two
vehicles – short circuit risk.
4 Start by connecting the jumper cable from the positive terminal of the
support vehicle to the positive
terminal connector located in your
BMW's engine compartment. The
cover of the auxiliary terminal for
jump starting is marked with a "+"
sign (refer to the illustration). Pull up
to open the cover. The illustration
shows the external positive terminal
connector of the BMW 540i. For the
BMW 525i, BMW 530i refer to
"Engine compartment" on page 160.
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5 Then connect the negative terminals.
Attach the cable to either the support
vehicle's negative battery terminal, or
to a suitable ground on its engine or
bodywork. Then connect the other
end of the cable to a ground on the
engine or body of the vehicle which is
to be started. There is a special nut
on the strut dome of your BMW; refer
to the arrow in the illustration.
Follow the same sequence for
connecting the jumper cables if
you assist in jump-starting another ve-
hicle. If you do not, there is a risk of in-
jury caused by spark generation at the
battery. <
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Jump-starting

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Overview
201nJump-starting Towing the vehicle
6 Start the engine of the support
vehicle and let it run.
7 Start the engine on the vehicle needing the jump-start, and allow it
to run as usual. If the first start at-
tempt is not successful, wait a few
minutes before another attempt in
order to allow the discharged battery
to recharge.
8 Before disconnecting the jumper cables from your BMW, turn on the
headlamps, the rear window
defroster and the highest blower
speed and allow the engine to run
at least 10 seconds to prevent a volt-
age surge at the voltage regulator.
9 Then disconnect the jumper cables in the opposite order.
Have the battery recharged if neces-
sary.
Tow fitting
The screw-in tow fitting is stored in the
onboard tool kit; be sure that it remains
in the vehicle at all times. This fitting
is designed for installation in the tow
sockets located at the front and rear of
the vehicle, and is intended for towing
on proper road surfaces only.
It should not be used to pull a vehicle
out of deep snow, mud, sand, etc. Al-
ways observe all applicable towing laws
and regulations.
Access to tow sockets
Front:
Apply pressure to the arrow symbol on
the cover panel to remove.
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Rear:
Apply pressure to the arrow symbol on
the cover panel to remove.
Screw the tow fitting in until it bot-
toms firmly. If this is not done, the
threads could be damaged.
Never attach tie-down hooks, chains,
straps, or tow hooks to tie rods, control
arms, or any other part of the vehicle
suspension, as severe damage to these
components will occur, leading to pos-
sible accidents. <
Use only a nylon towing strap to tow
the vehicle, since the inherent resil-
ience of this material helps protect both
vehicles from sudden jerking move-
ments.
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Index
Data
Technology
Repairs
Car care
Controls
Overview
213nTire Pressure Control (RDC)*
The Tire Pressure Control system (RDC)
assumes the task of regular tire pres-
sure checks for you. The tire pressure is
monitored at all four wheels, even when
the vehicle is moving.
Behind the valve stem in every wheel,
there is an electronic chip which is
designed for severe-duty applications
and long service life. It contains a pres-
sure sensor, a transmitter and a battery.
The pressure is measured in extremely
short time intervals and then transmit-
ted by a radio signal. If an irregularity is
detected, the transmission rate is
increased.
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Near every wheel, there are antennas in
the body which receive the signals from
all four wheels. A central electronics
system evaluates the quadruple signals
and forwards any changes.
The RDC provides an important contri-
bution to driving safety.

224nElectrical system Drive belts
Battery
12 V, 90Ah
Spark plugs
Bosch FGR 7 DQP or
NGK BKR 6 EQUP
This spark ignition system meets all
requirements of the Canadian Interfer-
ence-Causing Equipment Regulations
(ICES-2). BMW 525i, 530i:
Water pump – Generator –
Power steering
Drive belt 6 PK x 1538
A/C compressor
Drive belt 5 PK x 863
BMW 540i:
Water pump – Generator –
Power steering
V-belt 7 K x 1635
A/C compressor
V-belt 5 K x 1004 You can obtain Original BMW
Parts and Accessories, as well as
professional advice from your BMW
center. <