Mercedes-Benz S-Class Coupe 2015 Operator's Manual page 348

Jump-starting
346
Do not start the vehicle using a rapid charging device. If your vehicle's battery is discharged,
the engine can be jump-started from another vehicle or from a second battery using jumper
cables. 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.
You may only jump-start the vehicle when the engine and exhaust system are cold.
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Keep away from fire and open flames.
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Do not start the engine if the battery is frozen. Let the battery thaw first.
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All vehicles except AMG vehicles: do not start the engine if the battery is frozen. Let the
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battery thaw first.
Only jump-start from batteries with a 12 V voltage rating.
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Only use jumper cables which have a sufficient cross-section and insulated terminal clamps.
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Do not lean over the battery.
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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 battery slightly.
Make sure that the two vehicles do not touch.
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Make sure that:
the jumper cables are not damaged.
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when the jumper cables are connected to the battery, uninsulated sections of the terminal
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clamp do not come into contact with other metal sections.
the jumper cables 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 that the ignition is switched off (
X
cluster must be off. When using the SmartKey, turn the SmartKey to position 0 in the ignition
lock and remove it (
Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
X
Open the hood.
X
Example: ground point cover
Turn fasteners : one Õ turn and remove.
X
Remove the cover whilst pressing down on cap ; of the washer fluid reservoir.
X
page 147).
Y
page 147). All indicator lamps in the instrument
Y