User Manual - Page 285

For CLA.

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If the indicator/warning lamps do not light up in the instrument cluster at low temperatures, it is very
likely that the discharged battery has frozen. In this case you may neither jump-start the vehicle nor
charge the battery. Let the battery thaw first. 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.
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.
R
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.
R
Only use jumper cables that are not damaged and have a sufficient cross-section and insulated
terminal clamps.
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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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Non-insulated parts of the terminal clamps do not come into contact with other metal parts while
the jumper cables are connected to the battery.
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The jumper cables cannot come into contact with parts that can move when the engine is running,
such as the V-belt pulley or the fan.
X
Secure the vehicle by applying the electric parking brake.
X
Shift the transmission to position j.
X
Turn the SmartKey to position g in the ignition lock and remove it.
X
Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
X
Open the hood.
Jump-starting
283
Breakdown assistance
Z
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