Users Manual Part 5

using the jump lead. Start with the donor
vehicle first.
#
Start the engine of your own vehicle.
#
Let the engines run for several minutes.
#
Before disconnecting the jump leads, switch
on an electrical consumer in your own vehi‐
cle, e.g. the rear window heater or the light‐
ing.
When starting assistance has finished:
#
First remove the jump lead from the earth
point of your own vehicle and the negative
pole of the donor battery, then remove the
jump lead from the positive contacts of both
vehicles. Always start with your own vehicle
first.
#
Close cover 1 of the positive contact.
Further information can be obtained at a quali‐
fied specialist workshop.
Charging the 12 V battery
#
Connect the positive contacts of the vehicle
and the charger with the charging cable.
Start with the vehicle first.
#
Connect the negative contact of the charger
and earth point 2 on the vehicle with the
charging cable. Start with the charger first.
#
Start the charging process.
When the charging process is complete:
#
Remove the charging cable from earth point
2 on the vehicle and the negative contact
of the charger first and then from the posi‐
tive contacts on the vehicle and charger.
Always start with the vehicle first.
#
Close cover 1 of the positive contact.
Replacing the 12 V battery
#
Observe the notes on the 12 V battery
(/ page 476).
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:
R
Always replace a faulty battery with a battery
which meets the specific vehicle require‐
ments.
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.
R
Carry over detachable parts, such as vent
hoses, elbow fittings or terminal covers from
the battery being replaced.
R
Make sure that the vent hose is always con‐
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.
Breakdown assistance
481