Mercedes-Benz CLS Operator's Manual page 297

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, jump-
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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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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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If the battery is fully discharged, leave the battery that is being used to jump-start connected for
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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 clamp
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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.
Apply the parking brake firmly.
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Shift the transmission to position P.
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Make sure that the ignition is switched off. All indicator lamps in the instrument cluster must be
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off. When using the SmartKey, turn the SmartKey to position 0 in the ignition lock and remove it
( page 127).
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Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
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Open the hood.
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Position number B identifies the charged battery of the other vehicle or an equivalent jump-starting
device.
Slide cover : of positive terminal ; in the direction of the arrow.
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Connect positive terminal ; on your vehicle to positive terminal = of donor battery B using the
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jumper cable, always begin with positive terminal ; on your own vehicle first.
Start the engine of the donor vehicle and run it at idling speed.
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I n f o r ma t i o n P r o v i d e d b y :
Jump-starting
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