Towing and tow-starting, Jump-starting – BMW 645Ci Coupe 2004 User Manual
Page 187
185
Preparing
1.
Check whether the battery of the other
vehicle has a voltage of 12 Volts and
approximately the same capacitance
in Ah. This information can be found on
the battery
2.
Switch off the engine of the vehicle pro-
viding assistance
3.
Switch off any consumer units in both
vehicles.
There must not be any contact
between the bodies of the two vehi-
cles, as otherwise there is a danger of
shorting.
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Connecting jumper cables
To avoid personal injury from sparks,
always observe this sequence when
connecting jumper cables.
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On your BMW, the so-called starting-aid
terminal in the engine compartment serves
as the battery positive terminal, also refer
to engine compartment essentials on
page
the cover.
1.
Fold open the cover of the BMW start-
ing-aid terminal. To do so, pull the tab
2.
Attach one end of the jumper cable
plus/+ to the positive terminal of the
battery or a starting-aid terminal of the
vehicle providing assistance
3.
Attach the second end of the cable to
the positive terminal of the battery or to
a starting-aid terminal of the vehicle to
be started
Your BMW has a special nut as body
ground or negative pole.
4.
Attach one end of the jumper cable
minus/– to the negative terminal of the
battery or to an engine or body ground
of the vehicle providing assistance
5.
Attach the second end of the cable to
the negative terminal of the battery or to
the engine or body ground of the vehi-
cle to be started.
Starting engine
1.
Start the engine on the support vehicle
and allow it to run for several minutes at
increased speed
2.
Start the engine on the other vehicle in
the usual way.
If the first start attempt is not success-
ful, wait a few minutes before another
attempt in order to allow the discharged
battery to recharge
3.
Let the engines run for a few minutes
4.
Disconnect the jumper cables by
reversing the connection sequence
If required, have the battery inspected and
recharged at your BMW center.
Never use spray fluids to start the
engine.
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Towing and tow-starting
Always observe all applicable towing
laws and regulations.
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Never allow passengers to ride in a
towed vehicle for any reason.
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Online Edition for Part No. 01 41 0 157 980 - © 01/04 BMW AG