Mercedes-Benz S-Class 2012 - Manual (Page 484)

X Make sure that the two vehicles do not touch.
X Secure the vehicle by applying the electric parking brake.
X Shift the transmission to position P.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood ( Y page 456).
Position number A identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X Remove the cover from positive terminal :.
X Connect positive terminal : on your vehicle to positive terminal ; of donor battery A
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 A to earth point ? of your vehicle using
the jumper cable, connecting the jumper cable to donor battery A 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 ? and negative terminal =, then from
positive terminal : and positive terminal ;, each time disconnecting from the battery on
your own vehicle first.
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.
482
Jump-starting
Breakdown assistance