Mercedes-Benz 2013 M Class - Manual (Page 392)

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:
R
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,
jump-start the vehicle using a second battery or a jump-starting device.
R
You may only jump-start the vehicle when the engine and exhaust system are cold.
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Do not start the engine if the battery is frozen. Let the battery thaw first.
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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 a few minutes before attempting to start. This charges the battery slightly.
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Make sure that the two vehicles do not touch.
Make sure that:
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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 do not come into contact with other metal sections.
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the jumper cables cannot come into contact with parts such as the V-belt pulley or the fan.
These parts move when the engine is started and while it is running.
X Secure the vehicle by applying the electric parking brake.
X Shift the transmission to position P.
X Turn the SmartKey to position 0 in the ignition lock and remove it ( Y page 157). On vehicles
with KEYLESS-GO, make sure the ignition is switched off ( Y page 158). All indicator lamps
in the instrument cluster must be off.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood ( Y page 364).
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
390
Jump-starting
Breakdown assistance