Mercedes-Benz M-Class 2012 Owners Manual - Manual (Page 344)

X Turn the SmartKey to position 0 (
Y
page 139) in the ignition lock and remove it. On vehicles
with KEYLESS-GO, make sure the ignition is switched off (
Y
page 139). All indicator lamps
in the instrument cluster must be off.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood (
Y
page 312).
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X Slide cover : of positive terminal ; in the direction of the arrow.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B
using the jumper cable, beginning with your own battery.
X Start the engine of the donor vehicle and run it at idling speed.
X Connect negative terminal ? of donor battery B to earth point A of your vehicle using
the jumper cable, connecting the jumper cable to donor battery B first.
X Start the engine.
X Allow the engine to run for a few minutes before disconnecting the jumper cable.
X
First, remove the jumper cable from earth point A and negative terminal ?, then from
positive terminal ; and positive terminal =, each time disconnecting from the contacts
on your own vehicle first.
X After removing the jumper cable, close cover : on positive terminal ;.
X Have the battery checked at a qualified specialist workshop, e.g. an authorized Mercedes-
Benz Center. The jump-starting procedure is not a standard operating state; therefore, have
the battery checked.
342
Jump-starting
Breakdown
assistance