Mercedes-Benz GLA 180 Owner's Manual page 329

Jump-starting
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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 donor 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, jump-
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start the vehicle using a donor battery or a jump-starting device
vehicles with a petrol engine: jump-start the vehicle only when the engine and exhaust system
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are cold
do not start the engine if the battery is frozen. Let the battery thaw first
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jump-starting may be performed only using batteries with a nominal voltage of 12 V
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only use jump leads that are not damaged and have a sufficient cross-section and insulated
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terminal clamps.
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 while
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the jump leads are connected to the battery
the jump leads 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.
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Manual transmission: depress the clutch pedal fully and shift to neutral.
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Automatic transmission: shift the transmission to position j.
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Turn the key to position g in the ignition lock and remove it.
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Switch off all electrical consumers, e.g. rear window heating, lighting etc.
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Open the bonnet.
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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.
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Connect positive terminal ; on your vehicle to positive terminal = of donor battery B using the
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jump lead. beginning with your own battery.
Start the engine of the donor vehicle and run it at idling speed.
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