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ments certain measures when the 12-volt
vehicle battery is subjected to heavy loads:
— The idling speed is increased so that the
alternator provides more electricity.
— The performance of large electrical con-
sumers may be reduced or they may be
switched
off
completely.
— The power supply to the 12-volt socket
and the cigarette lighter may be interrup-
ted temporarily while the engine is being
started.
12-volt vehicle battery is discharged
The 12-volt vehicle battery will discharge if
you use electrical consumers when the en-
gine is switched
off.
WARNING
Incorrectly securing the battery and using
incorrect 12-volt vehicle batteries can
cause short circuits,
fire
and serious inju-
ries.
·
Always use maintenance-free and leak-
proof 12-volt vehicle batteries that have
the same properties,
specifications
and
dimensions as the
factory-fitted
12-volt
vehicle battery.
WARNING
A highly explosive mixture of gases is giv-
en
off
when the 12-volt vehicle battery is
being charged.
·
Charge 12-volt vehicle batteries only in
well-ventilated spaces.
·
Never charge a 12-volt vehicle battery
which is frozen or has been frozen. Dis-
charged 12-volt vehicle batteries can
even freeze at temperatures of approx.
0°C (+32°F).
·
The 12-volt vehicle battery must be re-
placed if it has ever frozen.
WARNING
Incorrectly connected cables can cause
a short circuit.
·
First connect the positive cable and
then the negative cable.
NOTICE
·
Never connect or disconnect 12-volt vehi-
cle batteries if the ignition is switched on
or the engine is running. Never use a 12-
volt vehicle battery that does not corre-
spond with the vehicle’s
specifications.
This can damage the electrical system or
electronic components, which can cause
electrical faults.
·
Never connect equipment that supplies
electric power, such as a solar panel or
a battery charger, to the 12-volt sockets
or to the cigarette lighter to charge the
12-volt vehicle battery. This can damage
the vehicle electrical system.
Dispose of the 12-volt vehicle battery
in accordance with the applicable reg-
ulations. 12-volt vehicle batteries may con-
tain toxic substances such as sulphuric acid
and lead.
Electrolyte can pollute the environ-
ment. Collect any service
fluids
that
escape or are spilled and dispose of them
correctly and with respect for the environ-
ment.
Troubleshooting
Please refer to , and on page
312 and and at the start of the
chapter on page 325.
12-volt vehicle battery
The warning lamp lights up red. A message
is shown on the instrument cluster display.
Do not drive on!
This can result in dam-
age to the electrical system.
1. Stop the vehicle as soon as possible
and when safe to do so.
2. Switch
off
any electrical consumers
that are not required.
3. Seek expert assistance.
Auto StartStop cannot start the engine
→
page 145.
328
Checking and
refilling
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