Mercedes-Benz S-Class 2011 Operator's Manual page 474

Jump-starting
472
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 (
Position number A identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
! Never swap the terminal connections.
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
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.
Y page 446).