Giving and receiving assistance, Jump-starting – BMW 330XI User Manual

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Giving and receiving assistance

Jump-starting

When your battery is discharged you
can use two jumper cables to start your
vehicle with power from the battery in a
second vehicle. You can also use the
same method to help start another
vehicle. Only use jumper cables with
fully insulated handles on the terminal
clamps.

Do not touch high-voltage wiring
and cables on a running engine.

Contact with components carrying high
voltage can be harmful or fatal. Care-
fully observe the following instructions
to avoid personal injury and/or damage
to one or both vehicles.

1. The battery in the support vehicle

must also be rated at 12 volts. This
information is provided on the battery
label

2. Stop the engine of the support vehi-

cle and switch off all electrical com-
ponents in both vehicles – except for
the hazard warning flashers of the
support vehicle

3. Make absolutely certain that there is

no contact between the bodywork of
the two vehicles – short circuit haz-
ard

4. The auxiliary jump-starting terminal

located in your BMW's engine com-
partment acts as the positive battery
terminal. The cover of this auxiliary
terminal is marked with a + sign.
Remove by pulling the tab – see
arrow 1.
Start by connecting the jumper cable
from the positive terminal of the dis-
charged battery to the positive termi-
nal of the support battery

5. Then connect the negative terminals

with the other jumper cable. First
connect one end to the negative bat-
tery terminal or to a suitable grand on

the support vehicle. Then connect
the other end to the negative battery
terminal or a suitable ground on the
vehicle being started.
Your BMW is equipped with a special
nut for this purpose – see arrow 2

Always adhere to this sequence
when connecting jumper cables;

failure to observe this procedure can
lead to sparks at the battery terminals
and pose an injury hazard.

6. Start the engine of the support vehi-

cle and let it run for several minutes
at a slightly elevated engine idle
speed

7. Start the engine of the other vehicle

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, let the engines run for a few
minutes

9. Then disconnect the jumper cables

in reverse sequence.

Depending on the cause of the fault,
have the battery checked and
recharged by your BMW center.

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