Mercedes-Benz S-Class 2013 Owner's Manual page 432

Do not use a rapid charging device to start the vehicle. If your vehicle's battery is discharged,
the engine can be jump-started from another vehicle or from a second battery using jump
leads. Observe the following points:
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,
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jump-start the vehicle using a second battery or a jump-starting device.
Vehicles with a petrol engine: only jump-start the vehicle when the engine and exhaust
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system are cold.
Do not start the engine if the battery is frozen. Let the battery thaw first.
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Jump-starting may only be performed from batteries with a nominal voltage of 12 V.
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Only use jump leads that have a sufficient cross-section and insulated terminal clamps.
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If the battery is fully discharged, leave the battery that is being used to jump-start connected
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for a few minutes before attempting to start. This charges the empty battery a little.
Make sure that the two vehicles do not touch.
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Make sure that:
The jump leads are not damaged.
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Non-insulated parts of the terminal clamps do not come into contact with other metal parts
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while the jump leads are connected to the battery.
The jump leads cannot come into contact with parts which can move when the engine is
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running, such as the V-belt pulley or the fan.
Secure the vehicle by applying the electric parking brake.
X
Shift the transmission to position P.
X
Make sure the ignition is switched off (
X
cluster must be off. When using the key, turn the key to position 0 in the ignition lock and
remove it ( page 191).
Y
Switch off all electrical consumers, e.g. rear window heating, lighting etc.
X
Open the bonnet.
X
Earth point cover (example: right-hand drive)
page 191). All indicator lamps in the instrument
Y
Jump-starting
Z
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