Mercedes-Benz C-Sedan 2012 Owners Manual - Manual (Page 304)

X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood ( Y page 278).
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.
Towing and tow-starting
Important safety notes
G WARNING
If you tow the vehicle, you must use a rigid
towing bar if:
R the engine is not running.
R there is a brake system malfunction.
R there is a malfunction in the power supply
or the vehicle's electrical system.
The power assistance for the steering and the
brake force booster do not work when the
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Towing and tow-starting
Breakdown assistance