BMW M3 2001, Manual

Page: 154 / 183

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Do not use spray starter fluids to start
the engine.
If the battery is discharged, the engine
can be started using two jumper cables
and another vehicle's battery. Use only
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
instructions to avoid personal injury or
damage to one or both vehicles.
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1 Be sure that the battery on the
support 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's 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 positive terminal
connector is marked with a "+" sign.
Refer to the illustration. Remove by
pulling the tab (arrow 1)
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 on the bodywork of the
vehicle that is to be started. There is
a special nut provided for this on the
BMW (arrow 2)
Follow the same sequence for
connecting the jumper cables if
you assist in jump-starting another
vehicle. If you do not, there is a risk of
injury caused by spark generation at the
battery.
<
6 Start the support vehicle's engine
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
attempt 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
rear window defroster and set the
blower to the highest speed;
allow the engine to run approx.
10 seconds. This will prevent a
voltage surge from the voltage regu-
lator to the electrical accessories
9 Then disconnect the jumper cables in
reverse sequence.
Depending on the cause of the fault,
recharge the battery.
Jump-starting