BMW 5 series sedan Owner's Manual page 300

Mobility
Do not touch live parts
To avoid the risk of potentially fatal injury,
always avoid all contact with electrical compo‐
nents while the engine is running.◀
Preparation
1. Check whether the battery of the other ve‐
hicle has a voltage of 12 volts. This informa‐
tion can be found on the battery.
2. Switch off the engine of the assisting vehi‐
cle.
3. Switch off any electronic systems/power
consumers in both vehicles.
Bodywork contact between vehicles
Make sure that there is no contact be‐
tween the bodywork of the two vehicles; other‐
wise, there is the danger of short circuits.◀
Starting aid terminals
Connecting order
Connect the jumper cables in the correct
order; otherwise, there is the danger of injury
from sparking.◀
The so-called starting aid terminal in the engine
compartment acts as the battery's positive ter‐
minal.
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Breakdown assistance
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The body ground or a special nut acts as the
negative terminal.
Connecting the cables
1. Pull off the cap of the BMW starting aid ter‐
minal.
2. Attach one terminal clamp of the positive
jumper cable to the positive terminal of the
battery, or to the corresponding starting aid
terminal of the vehicle providing assistance.
3. Attach the other end of the cable to the pos‐
itive terminal of the battery, or to the corre‐
sponding starting aid terminal of the vehicle
to be started.
4. Attach one terminal clamp of the negative
jumper cable to the negative terminal of the
battery, or to the corresponding engine or
body ground of the vehicle providing assis‐
tance.
5. Attach the other end of the cable to the neg‐
ative terminal of the battery, or to the corre‐
sponding engine or body ground of the ve‐
hicle to be started.
Starting the engine
Never use spray fluids to start the engine.
1. Start the engine of the assisting vehicle and
let it run for several minutes at an increased
idle speed.
2. Start the engine of the vehicle being started
in the usual way.
If the first starting attempt is not successful,
wait a few minutes before making another