Mercedes-Benz B-Class Operator's Manual page 264

Jump-starting
262
Make sure that:
The jumper cables are not damaged.
R
Non-insulated parts of the terminal clamps do not come into contact with other metal parts while
R
the jumper cables are connected to the battery.
The jumper cables cannot come into contact with parts that can move when the engine is running,
R
such as the V-belt pulley or the fan.
Secure the vehicle by applying the electric parking brake.
X
Shift the transmission to position j.
X
Turn the SmartKey to position g in the ignition lock and remove it.
X
Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
X
Open the hood.
X
Position number B identifies the charged battery of the other vehicle or an equivalent jump-starting
device.
Press together cover : of positive clamp ; and slide it back.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B using the
X
jumper cable, beginning with your own battery.
Start the engine of the donor vehicle and run it at idling speed.
X
Connect negative terminal ? of donor battery B to ground point A of your vehicle using the
X
jumper cable, connecting the jumper cable to battery of other vehicle B first.
If the battery is fully discharged, leave the battery that is being used to jump-start connected for
X
a few minutes before attempting to start. This charges the battery slightly.
Start the engine.
X
Before disconnecting the jumper cables, let the engine run for several minutes.
X
First, remove the jumper cables from ground point A and negative terminal ?, then from pos-
X
itive terminal ; and positive terminal =. Begin each time at the contacts on your own vehicle
first.
Close cover : of positive terminal ; after removing the jumper cables.
X
Close the hood.
X
Have the battery checked at a qualified specialist workshop.
X
i
Jump-starting is not considered to be a normal operating condition.