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than is being generated and ensures an opti-
mal state of charge for the battery.
@
Tips
- But even energy management
cannot
negate the limits of physics. Consider
that the power and life of a battery are
limited.
- If starting ab ility is threatened,
the indi-
cator light (•) appears ¢
page 17 .
What you should know
The highest priority is given to maintaining
starting capability.
The battery is severely taxed in short-dis t ance
driving, in city traffic and d uring the cold time
of year . Abu ndant e lectrica l energy is re-
q uired, but only a litt le is generated . It is also
cr itical if the engine is not runn ing and electri-
cal components are turned on. In th is in-
stance energy is being consumed but none is
be ing generated.
It is in precisely these situations that you w ill
notice energy management
actively regulat-
ing the distribution of energy.
Vehicle stand s for an ext ended period
If you do not drive you r vehicle over a period
of severa l days or weeks, electrical compo-
nents are grad ually cut back or switched off.
This reduces energy consumption and main-
tains starting capab ility over a longer per iod.
Some of the conven ience functions may not
operate, such as the inter ior lights or the
power seat adjustment.
The conven ience
functions will be ava ilable again whe n you
switch on the igni ti on a nd start the engine.
With the engine turned off
If you list en to t he radio, for example, with
the eng ine turned off or use othe r MMI func-
tions, the bat te ry is being discha rged .
If starting capability is jeopardized due to en -
e rgy consumpt ion, the follow ing warning ap-
pears in the MMI disp lay:
Int e llig e nt technolog
y
203
Please start the engine soon or the system
will be turned off.
The wa rning ind icates t hat the sys t em w ill be
t urned off autom atically aft er 3 minu t es. If
you w ish to continue using the funct ions, you
have to start the engine.
With the engine running
Althoug h e lect rical energy is generated when
t he vehicle is being driven, t he battery can be-
come d ischarged. This happe ns mostly when
little energy is being generated and a g reat
deal consumed and the battery's state of
charge is not opt imal.
To b ring t he energy ba lance back int o equili -
brium, consumers which req uire especially
la rge amounts of energy a re temporari ly cut
back or sw itched off. Heat ing systems in par-
ticular require a great deal of energy. If you
notice, for example, that the heated seats* or
the heated rear window are not heating, they
have been temporarily cut back or switched
off . These systems w ill be availabl e again as
soon as the ene rgy balance has been restored.
You w ill also notice that engine idle speed has
been increased slightly . This is no rmal and not
a cause for concern. By increas ing engi ne idle
speed the additional e nergy requi red is gene r-
ated a nd the battery is charged.
•
•
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