Mercedes-Benz GLC 2017 Operator's Manual page 325

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.
Vehicles with a gasoline engine: only jump-start the vehicle when the engine and exhaust
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system are cold.
All vehicles except vehicles with a lithium-ion battery: do not start the engine if the battery
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is frozen. Let the battery thaw first.
Jump-starting may be performed only using batteries with a nominal voltage of 12 V.
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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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Bare parts of the terminal clamp do not come into contact with other metal parts while the jumper
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cables are connected to the battery.
The jumper cables cannot come into contact with parts that can move when the engine is running,
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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
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 u in the ignition lock and remove it
( page 127).
Y
Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
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Open the hood.
X
Position number C identifies the charged battery of the other vehicle or an equivalent jump-starting
device.
Lift up panel B.
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Slide cover A of positive terminal : in the direction of the arrow.
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Jump-starting
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