Mercedes-Benz E-Class Sedan Operator's Manual page 330

328 Breakdown assistance
The jumper cable/charging cable must not
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come into contact with any parts which may
move when the engine is running.
Always make sure that neither you nor the
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battery is electrostatically charged.
Keep away from fire and open flames.
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Do not lean over the battery.
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When charging: only use battery chargers
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tested and approved by Mercedes-Benz and
read the battery charger's operating instruc‐
tions before charging the battery.
Observe the additional following points during
starting assistance:
Starting assistance may only be provided
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using batteries with a nominal voltage of 12
V.
The vehicles must not touch.
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Gasoline engine: Only accept starting assis‐
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tance if the engine is cold and the exhaust
system has cooled down.
Secure the vehicle by applying the electric
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parking brake.
Automatic transmission: Shift the trans‐
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mission to position j.
Make sure that the ignition and all electrical
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consumers are switched off.
Open the hood.
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Slide cover 1 of positive clamp
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jump-starting connection point in the direc‐
tion of the arrow.
Connect positive clamp
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the positive pole of the donor battery using
the jumper cable/charging cable. Always
begin with positive clamp
vehicle first.
During the starting assistance proce‐
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dure: start the engine of the donor vehicle
and run at idle speed.
Connect the negative pole of the donor bat‐
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tery and ground point
using the jumper cable/charging cable.
Begin with the donor battery first.
During starting assistance: start the
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engine of your own vehicle.
During the charging process: start the
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charging process.
During starting assistance: let the engines
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run for several minutes.
During starting assistance: before discon‐
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necting the jumper cable, switch on an elec‐
trical consumer on your own vehicle, e.g. the
2 on the
rear window heater or lighting.
2 on your vehicle to
2 on your own
3 of your own vehicle