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332 Breakdown assistance
begin with POSITIVE contact
vehicle first.
During starting assistance: start the engine of
#
the donor vehicle and run at idle speed.
Connect the negative terminal of the donor
#
battery and earth point
3
of your own vehicle
by using the jump lead/charging cable. Begin
with the donor battery first.
During starting assistance: start the engine of
#
your own vehicle.
During the charging process: start the charg-
#
ing process.
During starting assistance: let the engines run
#
for several minutes.
During starting assistance: before disconnect-
#
ing the jump lead, switch on an electrical con-
sumer on your own vehicle, e.g. the rear win-
dow heater or lighting.
When the starting assistance/charging process is
complete, perform the following steps:
First, remove the jump lead/charging cable
#
from earth point
3
and the negative terminal
2
on your own
of the donor battery, then POSITIVE contact
2
and the positive terminal of the donor bat-
tery. Begin each time with the contacts on
your own vehicle first.
After removing the jump lead/charging cable,
#
close cover
Further information can be obtained at a qualified
specialist workshop.
Replacing the 12 V battery
Observe the notes on the 12 V battery
#
(
page 327).
/
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualified specialist
workshop, e.g. at a Mercedes-Benz Service
Centre.
Observe the following notes if you want to replace
the battery yourself:
Always replace a faulty battery with a battery
R
which meets the specific vehicle require-
ments.
1
of POSITIVE contact 2.
The vehicle is equipped with an AGM technol-
ogy battery (Absorbent Glass Mat) or a lith-
ium-ion battery. Full vehicle functionality is
only guaranteed with an AGM battery or lith-
ium-ion battery. For safety reasons, Mercedes-
Benz recommends that you only use batteries
which have been tested and approved for your
vehicle by Mercedes-Benz.
Carry over detachable parts, such as vent
R
hoses, elbow fittings or terminal covers from
the battery being replaced.
Make sure that the vent hose is always con-
R
nected to the original opening on the side of
the battery.
Fit any existing or supplied cell caps.
Otherwise, gases or battery acid could
escape.
Make sure that detachable parts are recon-
R
nected in the same way.
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