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344
Checking and r
efilling levels
starting even after a long period. Some conven-
ience functions, such as r
emote vehicle open-
ing, may not be available under certain circum-
stances. These functions will be restored when
you switch on the ignition and start the engine.
With the engine switched o
For example, if you listen to the sound system
with the engine switched o the battery will run
down.
If the energy consumption means there is a risk
that the engine will not start, a text will be dis-
played in vehicles with a driver information sys-
tem.
This driver indicator tells you that you must start
the engine so that the battery can recharge.
When the engine is running
Although the alternator generates electrical
power, the battery can still become discharged
while the vehicle is being driven. This can occur
when a lot of power is being consumed but only
a small amount supplied, especially if the bat-
tery is not fully charged initially.
To restore the necessary energy balance, the
system will then temporarily shut o the elec-
trical devices that are using a lot of power, or
reduce the current they are consuming. Heat-
ing systems in particular use a large amount of
electrical power. If you notice, for instance, that
the seat heating or the rear window heater is
not working, they may have been temporarily
switched o or regulated to a lower heat out-
put. These systems will be available again as
soon as sucient electrical power is available.
You may also notice that the engine runs at
a slightly faster idling speed when necessary.
This is quite normal, and no cause for concern.
The increased idling speed allows the alterna-
tor to meet the greater power requirement and
charge the battery at the same time.
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