R
the start-up behaviour may deteriorate, par‐
ticularly at low temperatures
R
it is recommended that you have a thawed
battery checked at a qualified specialist work‐
shop
*
NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
#
Avoid numerous and extended attempts
to start the engine.
Observe the following points during starting
assistance and when charging the battery:
R
only use undamaged jump leads/charging
cables with a sufficient cross-section and
insulated terminal clamps
R
non-insulated parts of the terminal clamps
must not come into contact with other metal
parts while the jump leads/charging cables
are connected to the battery/jump-start con‐
nection point
R
the jump leads/charging cable must not
come into contact with any parts which may
move when the engine is running
R
always make sure that neither you nor the
battery is electrostatically charged
R
always keep away from fire and naked flames
R
do not lean over a battery
R
when charging: only use a battery charger
that has been tested and approved by
Mercedes-Benz and read the operating
instructions for your charger before charging
the battery.
Observe the additional following points during
starting assistance:
R
starting assistance may only be provided
using batteries with a nominal voltage of 12 V
R
the vehicles must not touch each other
#
Vehicles with a battery main switch: check
whether the battery main switch is switched
on (
/
page 126).
#
Secure the vehicle using the parking brake.
#
Vehicles with automatic transmission:
shift the transmission to position
j
.
#
Vehicles with manual transmission: shift
to neutral.
#
Switch off the ignition and all electrical con‐
sumers.
#
Open the bonnet (
/
page 279).
Example: jump-start connection point
%
Right-hand-drive vehicles: the jump-start
connection points may be on the opposite
side.
#
Remove the cover from the positive terminal
on the donor battery.
#
First, connect the positive terminal clamp of
the jump leads/charging cables to the posi‐
tive terminal of the other vehicle's battery.
#
With positive terminal clamp
2
of the jump
lead, slide the red protective cap on jump-
start connection point
1
back with a clock‐
wise turn.
#
Connect the positive terminal clamp to the
positive terminal of jump-start connection
point
1
.
#
During starting assistance: start the engine
of the donor vehicle and let it run at idle
speed.
#
Connect the negative terminal of the donor
battery to the earth point of your own vehicle
with the jump lead/charging cable. Begin
with the donor battery.
#
During starting assistance: start the engine
on your own vehicle.
#
When charging: start the charging process.
#
During starting assistance: let the engine
run for a few minutes.
#
During starting assistance: before discon‐
necting the jump lead, switch on an electrical
298 Breakdown assistance
