BMW 3 SERIES SEDAN Owner's Manual page 215

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.
Open the cover of the starting aid terminal.
Online Edition for Part no. 01 40 2 917 801 - II/13
Breakdown assistance
The body ground or a special nut acts as the
battery negative terminal.
Connecting the cables
1. Open the cover 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 terminal clamp on the other end
of the cable to the positive terminal of the
battery, or to the corresponding 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 assisting vehicle.
5. Attach the second terminal clamp to the
negative terminal of the battery, or to the
corresponding engine or body ground of the
vehicle 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.
If the vehicle being started has a diesel en‐
gine: let the engine of the assisting vehicle
run for approx. 10 minutes.
2. Start the engine of the vehicle being started
in the usual way.
Mobility
215