Mercedes-Benz 2009 E-Class Operator's Manual page 372

Practical hints
Jump starting
If the battery is discharged, the engine can be
started with jumper cables and the fully
charged battery of another vehicle or an
equivalent starter pack. Observe the
following:
Access to the battery is not possible on all
R
vehicles. If you cannot access the battery
in your vehicle provide jump start power by
an external battery or starter pack.
Jump starting should only be performed
R
when the engine and catalytic converter
are cold.
Do not start the engine if the battery is
R
frozen. Let the battery thaw out first.
Only jump start from batteries with the
R
same voltage rating (12 V). Jump starting
with a more powerful battery could damage
the vehicle's electrical system, which will
not be covered by the Mercedes-Benz
Limited Warranty.
Only use jumper cables with sufficient
R
cross-section and insulated terminal
clamps.
Always make sure the jumper cables are
R
not on or near pulleys, fans or other parts
22 Vehicles with gasoline engine only.
370
that move when an engine is started or
running.
Should the battery be drained completely,
R
let the donating power source charge the
vehicle for several minutes before
reattempting the starting process.
X
Make sure the two vehicles do not touch.
X
Switch off all electrical consumers.
X
Engage the parking brake.
X
Make sure the automatic transmission is in
22
park position P.
Sedan
The battery is located in the trunk underneath
the luggage box ( Y page 294).
X
Open the trunk.
Positive terminal of discharged battery
1
Negative terminal of discharged battery
2
Positive terminal of charged battery
3
Negative terminal of charged battery
4
! Never invert the terminal connections!
X
Connect positive terminals
the batteries with a jumper cable. Clamp
the cable to positive terminal
charged battery first.
X
Start engine of the vehicle with the charged
battery and run at idle speed.
X
Connect negative terminals
the batteries with a jumper cable. Clamp
the cable to negative terminal
charged battery first.
and of
1 3
of the
3
and of
4 2
of the
4