The essentials
››› in Notes on page 79
››› page 79 Tow-starting
If the engine will not start, first try starting it
us
in
g the battery of another vehicle
››› page 52. You should only attempt to tow-
start a vehicle if charging the battery does
not work. This is done by leveraging wheel
movement.
When tow-starting a vehicle with a petrol en-
gine, do not tow it more than a short dis-
tance, otherwise unburned fuel can enter the
catalytic converter.
However, if your vehicle has to be tow-star-
ted:
● Engage 2 nd
or 3 rd
g e
ar.
● Keep the clutch pressed down.
● Switch the ignition on.
● Once both vehicles are moving, release the
clutc
h.
● As soon as the engine starts, press the
clutc
h and move the gear lever into neutral.
This helps to prevent driving into the towing
vehicle.
››› in Notes on page 79
›››
page 79 How to jump start
Jump l e
a
ds The jump lead must have a sufficient wire
cr
o
ss section.
If the engine fails to start because of a dis-
charged battery, the battery can be connec-
ted to the battery of another vehicle to start
the engine.
Jump leads
Jump leads must comply with standard DIN
72553 (see cable manufacturer's instruc-
tions). The wire cross section must be at least
25 mm 2
for petrol engines and at least
35 mm 2
for diesel engines. Note
● The v ehic
les must not touch each other,
otherwise electricity could flow as soon as
the positive terminals are connected.
● The discharged battery must be properly
connected t
o the on-board network. How to jump start: description
Fig. 69
Diagram of connections for vehicles
w ithout
Start-Stop system. Fig. 70
Diagram of connections for vehicles
w ith
St
art-Stop system. Jump lead terminal connections
1. Switch off the ignition of both vehicles
››
›
.
52
The essentials
2. Connect one end of the re
d jump lead to
the positive + terminal of the vehicle
w ith the fl
at
battery A
› ››
Fig. 69
.
3.
Connect the other end of the red
jump
lead to the positive terminal + in the ve-
hic l
e pr
oviding assistance B .
4. For vehicles without Start-Stop system:
connect
one end of
the black jump lead to
the negative terminal – of the vehicle
pr o
v
iding the current B
› ››
Fig. 69
.
– F
or vehicles with Start-Stop system: con-
nect one end of
the black jump lead X to a
s uit
ab
le ground terminal, to a solid piece of
metal in the engine block, or to the engine
block itself ››› Fig. 70.
5. Connect the other end of the black
jump
lead X to a solid metal component bolted
t o the en
gine b
lock or to the engine block
itself of the vehicle with the flat battery.
Do not connect it to a point near the bat-
tery A .
6. Position the leads in such a way that they cannot
c
ome into contact with any moving
parts in the engine compartment.
Starting
7. Start the engine of the vehicle with the boostin
g battery and let it run at idling
speed. 8. Start the engine of the vehicle with the flat
batter
y and wait for 2 or 3 minutes until
the engine is running.
Removing the jump leads
9. Before you remove the jump leads, switch off the dipped be
am headlights if they are
switched on.
10.Turn on the heater blower and heated rear window in the
vehicle with the flat battery.
This helps minimise voltage peaks which
are generated when the leads are discon-
nected.
11.When the engine is running, disconnect the lea
ds in reverse order to the details
given above.
Make sure the battery clamps have sufficient
metal-to-metal contact with the battery termi-
nals.
If the engine fails to start, switch off the start-
er after about 10 seconds and try again after
about a minute. WARNING
● Ple a
se note the safety warnings referring to
working in the engine compartment
››› page 198, Working in the engine
compartment.
● The battery providing assistance must have
the same v
oltage as the flat battery (12 V)
and approximately the same capacity (see imprint on battery). Failure to comply could
re
s
ult in an explosion.
● Never use jump leads when one of the bat-
teries
is frozen. Danger of explosion! Even af-
ter the battery has thawed, battery acid could
leak and cause chemical burns. If a battery
freezes, it should be replaced.
● Keep sparks, flames and lighted cigarettes
awa
y from batteries, danger of explosion.
Failure to comply could result in an explo-
sion.
● Observe the instructions provided by the
manufact
urer of the jump leads.
● Do not connect the negative cable from the
other vehic
le directly to the negative terminal
of the flat battery. The gas emitted from the
battery could be ignited by sparks. Danger of
explosion.
● Do not attach the negative cable from the
other vehic
le to parts of the fuel system or to
the brake line.
● The non-insulated parts of the battery
clamp
s must not be allowed to touch. The
jump lead attached to the positive battery
terminal must not touch metal parts of the ve-
hicle, this can cause a short circuit.
● Position the leads in such a way that they
cannot c
ome into contact with any moving
parts in the engine compartment.
● Do not lean on the batteries. This could re-
sult
in chemical burns. » 53
