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Jump-starting
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WARNING
A discharged battery can freeze at temperatures below freezing point. When jump-starting the
vehicle or charging the battery, gases can escape from the battery. There is a risk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
If the warning and indicator lamps do not light up on the instrument cluster when temperatures are
low, it is probably because the discharged battery has frozen. In this case, you may neither charge
the battery nor jump-start the vehicle. The service life of a thawed-out battery may be shorter. The
starting characteristics can be impaired, particularly at low temperatures. Have the thawed-out
battery checked at a qualified specialist workshop.
All vehicles:
!
Vehicles with a gasoline engine: avoid repeated and lengthy starting attempts. Otherwise, the
catalytic converter could be damaged by non-combusted fuel.
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 136).
Y
Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
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Open the hood.
X
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