engine AUDI RS7 SPORTBACK 2014 Service Manual

134 Safety belts
-Failure to pay attention to the warning
light that come on, could lead to person­
al injury.
Why safety belts?
Frontal collisions and the law of physics
Frontal crashes create very strong forces for
people riding in vehicles.
Fig. 149 Unbe lted occupants in a vehicle heading for a
wall
Fig. 150 Th e vehicle crashes into the wall
The physical principles are simple. Both the
vehicle and the passengers possess energy
which varies w ith veh icle speed and body
weight . Engineers call this energy "kinetic en­
e rgy."
The higher the speed of the vehicle and the
greater the vehicle's weight, the more energy
that has to be "absorbed" in the crash.
Vehicle speed is the most significant factor.
If
the speed doubles from 15 to 30 mph (25 to
50 km/h), the energy increases 4 times!
Because the passengers of this veh icle are not
using safety belts¢
fig. 149, they will keep
moving at the same speed the vehicle was
mov ing just before the crash, until something
stops them - here, the wall ¢
fig. 150.
The same principles apply to people sitting in
a vehicle that is involved in a frontal collision .
Even at city speeds of 20 to 30 mph (30 to 50
km/h), the forces acting on the body can
reach one ton (2,000 lbs, or 1,000 kg) or
more. At greater speeds, these forces are even
higher.
Peop le who do not use safety belts are also
not attached to their vehicle. In a frontal colli­
s ion they will also keep moving forward at the
speed their vehicle was t ravell ing just before
the crash . Of course, the laws of physics don't
just apply to frontal collisions, they determine
what happens in all kinds of accidents and col­
lisions .
What happens to occupants not wearing
safety belts?
In crashes unbelted occupants cannot stop
themselves from flying forward and being in­
jured or killed. Always wear your safety belts!
Fig. 151 A driver not wearing a safety belt is violently
thrown fo rwa rd
Fig . 152 A rear passe nge r not wearing a safety belt
will fly forward and strike the driver
Unbelted occupants are not able to resist the
tremendous forces of i mpac t by holding tight
or bracing themselves. Without the benefit of
safety restraint systems, the unrestrained
ll-

occupant will slam violently into the steering
wheel, instrument panel, windshield, or what­
ever else is in the way
r::;; fig. 151. This impact
with the vehicle interior has all the energy
they had just before the crash.
Never rely on airbags alone for protection.
Even when they deploy, airbags provide only
additional protection. Airbags are not sup­
posed to deploy in all kinds of accidents. Al­
though your Audi is equipped with airbags, all
vehicle occupants, including the driver, must
wear safety belts correctly in order to mini­
mize the risk of severe injury or death in a
crash.
Remember too, that airbags will deploy only
once and that your safety belts are always
there to offer protection in those accidents in
which airbags are not supposed to deploy or
when they have already deployed. Unbelted
occupants can also be thrown out of the vehi­
cle where even more severe or fatal injuries
can occur.
It is also important for the rear passengers to
wear safety belts correctly. Unbelted passen­
gers in the rear seats endanger not only them­
selves but also the driver and other passen­
gers
r::;; fig. 152. In a frontal collision they will
be thrown forward violently, where they can
hit and injure the driver and/or front seat pas­
senger.
Safety belts protect
People think it's possible to use the hands to
brace the body in a minor collision. It's simply
not true!
Fig. 153 Driver is correctly restra ined in a sudden brak­
ing maneuver
Safety belts 135
Safety belts used properly can make a big dif­
ference. Safety belts help to keep passengers
in their seats, gradually reduce energy levels
applied to the body in an accident, and help
prevent the uncontrolled movement that can
cause serious injuries. In addition, safety belts
reduce the danger of being thrown out of the
vehicle.
Safety belts attach passengers to the car and
give them the benefit of being slowed down
more gently or "softly" through the "give" in
the safety belts, crush zones and other safety
features engineered into today's vehicles. By
"absorbing" the kinetic energy over a longer
period of time, the safety belts make the
forces on the body more "tolerable" and less
likely to cause injury.
Although these examples are based on a fron­
tal collision, safety belts can also su bsta ntia l­
ly reduce the risk of injury in other kinds of
crashes. So, whether you're on a long trip or
just going to the corner store, always buckle
up and make sure others do, too. Accident sta­
tistics show that vehicle occupants properly
wearing safety belts have a lower risk of being
injured and a much better chance of surviving
an accident. Properly using safety belts also
greatly increases the ability of the supplemen­
tal airbags to do their job in a collision . For
this reason, wearing a safety belt is legally re­
quired in most countries including much of
the United States and Canada.
Although your Audi is equipped with airbags,
you still have to wear the safety belts provid­
ed. Front airbags, for example, are activated
only in some frontal collisions. The front air­
bags are not activated in all frontal collisions,
in side and rear collisions, in roll overs or in
cases where there is not enough deceleration
through impact to the front of the vehicle.
The same goes for the other airbag systems in
your Audi. So, always wear your safety belt
and make sure everybody in your vehicle is
properly restrained!

Intelligent technology Notice about data
recorded by vehicle
control modules
Your vehicle is not equipped with an Event Da­
ta Recorder (EDR), installed by some manu­
facturers for the express purpose of capturing
data for retrieval after an accident or crash
event. EDR's are sometimes called "crash re­
corders".
Some state laws restrict the retr ieval or down­
loading of data stored by EDR's that were in­
stalled in a vehicle for the express purpose of
retrieving data after an accident or crash
event without the owner's consent.
Although your vehicle is not equipped with an
EDR, it is equipped with a number of electron­
ic control modules for various vehicle systems
such as, for examp le, engine function, emis­
sion control, as well as for the airbags and
safety belts.
These electronic control modules also record
vehicle-related data during norma l vehicle op­
eration for diagnostic and repair purposes.
The recording capacity of the electronic con­
trol modules is limited to data (no sound is re­
corded) and only a small amount of data is ac­
tually recorded over a very limited period of
time and stored when a system fault or other
condition is sensed by a control unit. Some of
the data then stored may relate to vehicle
speed, direction, braking as we ll as restraint
system use and performance in the event of a
crash or other condition. Stored data can only be read and downloaded with special equip­
ment.
Electronic Stabilization
Control (ESC)
Description
ESC helps to improve road holding and vehicle
dynamics to help reduce the probability of
skidding and loss of veh icle control. It works
only when the engine is running. ESC detects
Intelligent technology 189
certain difficult driving situations, including
when the vehicle is beginning to spin (yaw)
out of control and helps you to get the veh icle
back under control by se lectively braking the
wheels, and/or reducing engine power and
providing steering ass istance to help hold the
vehicle on the driver's intended course. The in­
dicator light
JjJ in the instrument cluster
blinks when ESC is taking action to help you
control the vehicle.
ESC has limitations .
It is important to remem­
ber that ESC cannot overcome the laws of
physics.
It will not always be able to help out
under all conditions you may come up against.
For example, ESC may not always be able to
help you master situations where there is a
sudden change in the coefficient of friction of
the road surface. When there is a section of dry road that is suddenly covered with water,
slush or snow, ESC cannot perform the same
way it would on the dry surface. If the vehicle
hydroplanes (rides on a cushion of water in­
stead of the road surface), ESC will not be
able to help you steer the vehicle because con­
tact with the pavement has been interrupted
and the vehicle cannot be braked or steered .
During fast cornering, particularly on winding
roads, ESC cannot always deal as effectively
with difficult driving situations than at lower
speeds.
Always adjust your speed and driving style to
road, traffic and weather conditions. ESC can­
not override the vehicle's physical limits, in­
crease the available traction, or keep a vehicle
on the road if road departure is a result of
driver inattention. Instead, ESC improves the
poss ibility of keeping the vehicle under con­
trol and on the road dur ing extreme maneu­
vers by usin g the driver 's steering inputs to
help keep the vehicle going in the intended di­
rection. If you are traveling at a speed that
causes you to run off the road before ESC can
provide any assistance, you may not experi­
ence the benefits of ESC.
ESC includes and/or works together with the
anti- lock brake system (ABS), brake assist sys -
tem, anti-slip regu lation (ASR), electronic
Ill>
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•

190 Intelligent technology
differential lock (EDL), dynamic steering* and
selective whee l torque control. ESC is switch­
ed on all the t ime. In certa in situations when
you need less traction, you can switch off ASR
by pressing the button
[ill c> page 191,
fig. 180. Be sure to switch ASR on again when
you no longe r need less traction .
Anti-loc k br ak ing system (ABS)
ABS prevents the wheels from locking up
when braking. The vehicle can still be steered
even during hard brak ing. Apply steady pres­
sure to the brake pedal. Do not pump the ped­
al. A puls ing in the brake pedal ind icates that
the system is he lp ing you to b rake the vehicle.
B rake as sist sys tem
The brake assist system can decrease braking
d istance. It increases braking power when the
driver presses the brake pedal quick ly in emer ­
gency situations. You must p ress and hold the
b rake pedal until the situation is over. I n
vehicles w ith adaptive cru ise cont rol*, the
b rake assist system is more sens it ive if the
d istance detected to the vehicle ahead is too
smal l.
Anti-slip regulation (ASR)
ASR reduces engi ne power when the d rive
wheels begin to spin and ad apts the fo rce to
the road condit ions. This makes i t easier to
start, accelerate and drive up hills .
Electronic differential lock (EDL)
The EDL brakes wheels that are spinning and
transfers the d rive powe r to the other d rive
wheel o r whee ls if the vehi cle is equipped wi th
a ll-w hee l drive* . This function is available up
to about 75 mph (120 km/h).
I n extreme cases, ED L automat ica lly swit ches
off to help keep the brake o n the braked whee l
from overheating . EDL wi ll switch on again au­
tomatically when conditions have returned to
norma l.
Dynamic steering*
On vehi cles w ith dy namic stee ring*, ESC helps
stabilize the steering i n critical s ituations.
Selective wheel torque control
T he sele ctive whee l torq ue con trol ope rates
when driving through c urves . The front whee l
on the inside of th e curve o r both wheels on
the inside of the curve are braked selectively
as needed. This minimizes sliding in the front
whee ls and allows for more precise driving
t hr ough curves. The appl icable system may
not act ivate when dr iv ing in wet or snowy con­
ditions .
,&. WARNING
-ESC, ABS, ASR, EDL, dy namic steeri ng*
and the select ive wheel torq ue con trol
c a nnot ove rcome the laws of physics.
T his is especially important on slippery
or wet roads.
If the systems begin acting
to stabilize your veh icle, yo u should im­
mediately change your speed to match
the road and traffic conditions. Do not
let the increased safety provided by
these systems tempt you to take r isks.
Doing so will increase the risk of a loss of
veh icle cont ro l, collision and ser ious per­
sonal injur ies.
- Always adapt your speed to road, traffic
and wea ther conditions. The risk of los­
ing con trol of t he vehicle increases when
d riving too fast, espec ially through
curves and on slippery or wet roads, and
when dr iving too close to vehicles up
ahead. ESC, ABS, the brake assist sys­
tem, ASR, EDL, dynam ic steering* and
the selective wheel torque contro l can­
not prevent collisions .
- Always accelerate with special care on
even, smooth su rfaces such as those that
are wet or covered with ice and snow .
The drive wheels can spin eve n w ith
these assistan ce systems that cannot al­
ways he lp to re duce the risk of loss of ve ­
h icle control.
(D Tips
- ABS and ASR o nly wo rk correctly when
all four wheels are equipped with identi­
cal tires. D iffe ren t tire si zes can lead to a
reduction in engine power.
-
...

-You may hear noises when the systems
described are working.
- If the indicator ligh t
DJ or flB (USA
models) @ (Canada models) appears,
Switching on and off
Intelligen t technolog y 191
there may be a malfunc tion c> page 19,
c> page 18 .
ESC turns on automatically when you s tart the engine .
Fig. 180 Cente r con sole,.$ OFF b utto n
The ESC is des igned to function in levels . De ­
pend ing on the leve l that is selected, the sta-
ESC l evels
bilization funct ion of the ESC is lim ited or
swi tched off . The amoun t of s tabilization con­
tro l will d iffer depending on the level.
T he following situat ions are exceptions where
it may be usefu l to switch on sport mode to
allow the w heels to spi n:
- Rocking the vehicle to free it when it is stuck
- Dr iving in deep snow or on loose ground
- Driving with snow chains
Sport mode on ESC/ASR off Sport mode off or
ESC/ASRon
Behavior
T he ESC and ASR stabili za- The stabili zation function The fu ll stabili zation f unc -
tion funct ions are lim ited is not ava ilable
c> & . ESC tion of the ESC and ASR is
¢ & . and ASR are sw itched off. available agai n.
Operati on Press the I~ O FF I button Press and hold the 1-~ O FFI Press the 1-~ O FF I button
briefly. button longer than 3 sec-again .
o nds.
Ind ic a to r I turns on . I and ifil•)H turn on . II turns off or II and
light s If i4•)ii turn off.
Dr iver mes- Stab ilization control Stabilization control Stabilization control
s ages (
ESC ): Spo rt. Warning! (ESC ): Off. Warning! Re· (ESC) : On
Reduced stabil ity duc ed stab ility
A WARNING
.
You should only sw itch sport mode on o r
switch ESC/ASR off if your drivi ng ab il ities
and road condi tions perm it. -
There is no vehicle stabilization when
ESC/ASR are switched off .
@ Tips
-The s tabilization func tion is limited
w he n spor t mode is sw itched on . The
dr iv ing whee ls cou ld spin and the vehicle
cou ld swe rve, especially on slick or slip­
pery road surfaces. -
ESC/ASR cannot be switched off or sport
mode cannot be switched on when adap·
tive cruise control* is switched on .
-If the rear spoiler system malfunctions,
sport mode may not switch on o r it may
switch off again automatically .

Braking
General information
What affects braking efficiency?
Operating condit ions and d riv ing hab it s
The brakes on today's automobi les are sti ll
subject to wear, depending largely on operat­
ing conditions and dr iving habits
c:> A . On
vehicles that are either driven mostly in stop­
and-go city traffic or are driven hard, the brake pads should be checked by your author­
i zed Audi dealer more often than specified in
the
Warr ant y & Maint enan ce bookle t. Failure
to have your b rake pads inspected can res ult
i n red uced brake performance.
On steep slopes, you should use the brak ing
effect of the engine. This way, you p revent un­
necessa ry wea r on the brake system.
If you
must use yo ur brakes, do not ho ld the brakes
down continuously. Pump the brakes at in ter ­
va ls.
Moistu re or road salt
Unde r ce rtain conditions, for example, when
driving through wate r or very heavy rain, or
even after washing your vehicle, the braking
effect can be reduced d ue to moisture (or in
freezing conditions ice) on the brake pads . A
few careful brake app lications should dry
off
the brake pads or remove any ice coatings.
When you are driving at higher speeds with
the windshield wipers on, the brake pads will
briefly touch the brake discs in regular inter­
vals so as to improve reaction t ime when brak­
ing on wet surfaces . You the driver w ill not no­
tice anything .
The effectiveness of the brakes can be reduced
when the vehicle is dr iven on a salt-covered
road and the brakes are not used . Here too,
you should clean
off accumulated salt coat ing
from b rake discs and pads with a few careful
applications of the brake
c:> ,&. .
Cor ro sion
There may be a tendency for dirt to build up
on the brake pads and corrosion to form on
Int ellig ent technolog y 193
the d iscs if the car is not driven regu larly or
only for short trips with litt le use of the
brakes.
If the brakes a re not used frequently, o r if cor­
rosion has formed on the discs, it is adv isable
to clean
off the pads and discs by braking
firmly a few times from a moderately high
speed
c:> ,&. .
Fault s in the brak e syste m
If you shou ld notice a sudden increase in
brake pedal trave l, then one of the two brake
circuits may have fai led ¢
A.
Low brake fluid lev el
Malfunctions can occu r in the bra ke system if
the b rake fluid level is too low. The brake flu id
level is monitored elec tronica lly.
Brake booster
The brake booster works with vacuum pres­
su re which is created only whe n the engine is
runn ing ¢,&. .
Brake lining we ar s tatus
Brake lining wear may be checked by visual in­
spection of the condition of the brake pads
through the open ings in the w heel. If neces­
sary, the wheel may be removed fo r thi s in­
spe ction ¢
page 2 54, Changing a wheel.
_& WARNING
-You should perform braking maneuvers
for the purpose of cleaning the brake system only if road conditions permit .
Other road users must not be put at risk -
you may ca use an accident!
- Before descend ing a steep grade, reduce
speed and sh ift transmission into a lower
gear or lower dr iving range. Do not ride
the brakes or hold the pedal down too long or too often . Th is could cause the
brakes to get hot and diminish braking
efficiency.
- Do not " ride the brakes" by rest ing your
foot on the pedal when you do not intend
to b rake. This may cause the brakes to
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194 Intelligent technology
overheat, premature wear and increased
stopping distance.
- Under certain climatic and operating
condit ions such as passing through wa­
ter, driving in heavy ra in or after wash ing
the vehicle, the effect iveness of the
brakes can be reduced. In winter, ice ca n
accumulate on the brake pads, linings ,
discs and d rums . Carefully apply brakes
for a test . B rakes wi ll dry a nd ice coat­
ings will be cleaned off after a few c are­
f ul brake app lications .
- Driv ing fo r an ex tende d pe riod of time on
salt-covere d roads w ithout us ing yo ur
brakes can also affect braking efficiency.
Clean off accumulated salt coating from
brake discs and pads w ith a few caref ul
brake applicat ions.
- If you damage the front spoiler, or if you
install a different spoiler, be sure the air
flow to the front brakes is not obstruct­ ed. Otherwise the brake system could
overheat reducing the effectiveness of
the ent ire brake system .
- Failure of one brake c ircuit will impair
the braking capability res ulting in an in­
creased stopp ing distance. Avoid driv ing
the vehicle and have it towed to t he near­
est Au di dea le r o r q ualified w ork sh o p.
- Never let the vehicle ro ll to a stop w ith
the e ngine shu t off.
- If the brake booster is not working, the
bra ke pedal must be p ressed conside ra­
bly harder to make up for the la ck of
booster assistance.
Electro-mechanical
power assist, dynamic
steering
The electro-mechanical power assist helps
the driver when steering .
Power steering adapts electronically based on
the vehicle speed .
Indicator lights and messages
• Steering defective! Stop the vehicle
If this indicato r light turns on and stays on
and t his message appears, the power steering
may have failed.
D o
not con tinue dr iv ing . See your author ized
Audi dealer or other qualified repair facility
for assistance .
'I-lj Steering: Sy stem fault You can continue
driving
If the indicato r light turns on and the mes­
sage appea rs, the stee ring may be more diffi­
cul t to move o r more sens itive th an usua l. The
stee ring wheel may a lso be at an ang le when
driving straight .
D rive slowly to you r authorized Aud i dea le r or
qualified wo rkshop to have the ma lf u nct ion
corre cted.
(:rij Dynamic st eering: Initializing
If this driver message appears and the indica­
tor light is f lashing on the instrument panel,
dynam ic steer ing* is being rei nitia lized . Afte r
sta rting the engine, the stee ring wheel will
move s ligh tly. Re- ini tiali zation mig ht be ne c­
essa ry if the stee ring wheel w as moved h ard
to the left and r ight wh ile the vehicle was not
moving . The display goes out as soon as initi ­
alization is complete.
D rive slowly to you r authorized Audi de aler or
qualified wo rkshop to have the ma lf u nct ion
corrected.
_& WARNING
Have t he dynamic stee ring * system mal ­
f u nction repa ired as soon as possible by an
a uthorized Audi dea ler or qua lified wor k­
shop - risk of acc ident !
(D Tips
If the . or (:rij indicator light on ly stays
on for a short time, yo u may continue driv­
i ng.
- The dynamic steering * stab ility systems
are not avai lab le in the event of a system
ma lf u nction.
- For add itiona l information on dynamic
steering *, refer to
c> page 96.

Driving with your
quattro
With all-wheel drive, all four wheels are driv­
en .
General information
With all-wheel drive, power is distributed to
all four wheels . This happens automatically
depending on your driving style and the road
conditions at the time . See also
t::;> page 189.
A center differential distributes the driving
power variably to the front and rear axle. It
works together with selective wheel torque
control, which activates when driving through
curves
t::;> page 190 . With the sport d ifferen­
tial*, power distribution to the rear wheels is
va riable and can be adjusted with drive select
¢page 96.
The all-wheel drive concept is designed for
hi gh engine power. Your vehicle is exception­
ally powerful and has exce llent dr iv ing charac­
teristics both under normal driving conditions
and on snow and
ice. Always read and follow
safety precautions
t::;> .& .
Winter tires
When driving in the w inter, your ve hicle with
all-wheel drive has an advantage, even with
regular tires. In winter road conditions it may
be advisable to mount winter tires (or all-sea­
son t ires) for improved driveability and brak­
ing: these tires must be mounted on
all four
wheels. See also ¢ page 243, Winter tires.
Tire chains
Where tire chains are mandatory on certain
roads, this normally a lso applies to vehicles
with a ll-wheel drive¢
page 244, Snow
chains.
Replacing wheels/tires
Vehicles w ith all-wheel drive must always
have tires of the same size. Also avoid tires
with different tread depths. For details see
page
t::;> page 239, New tires and replacing
tires and wheels .
Intelligent technology 195
Off•Road driving?
Your Audi does not have enough g round clear­
ance to be used as an off-road vehicle.
It is
therefore best to avoid rough tracks and un ­
even terrain as much as possible. Also refer to
¢page 199.
A WARNING
Always adjust your dr iv ing to road and traf­
fic conditions. Do not let the extra safety
afforded by all-wheel drive tempt you into
taking extra risks.
- Although the all-wheel drive is very ef­ fective, always remember that braking
capacity is lim ited by tire traction. You
should therefore not drive at excessive
speeds on icy or slippery road surfaces.
- On wet road surfaces, be careful not to
drive too fast because the front wheels
could begin to slide on top of the water
(aquaplaning) . If this should occur, you
will have no warning from a sudden in­
crease in engine speed as with a front­
wheel drive veh icle. Always drive at
speeds which are su ited to the road con­
ditions - risk of crash.
Energy management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimizes the
availability of electrical energy for starting
the engine .
If a vehicle with a conventiona l energy system
is not driven for a long period of tim e, the bat­
tery is discharged by idling current consumers
(e.g . immobilizer). In certain circumstances it
can resu lt in there being insufficient energy
available to start the eng ine.
Intelligent energy management in your vehi­
cle handles the distribution of e lectrica l ene r­
gy. Starting ability is markedly improved and
the life of the battery is extended .
ll>
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•

196 Intelligent technology
Basically, energy management consists o f
battery diagnosis, idling current manage­
ment
and dynamic energy man agement.
Battery diagnosis
Battery diagnosis continuously dete rm ines
the state of the battery. Sensors determine
battery vo ltage, battery current and battery
temperature. This determines the current
state of charge and the power of the battery.
Idling current management
I dling current management reduces energy
consumption while the vehicle is standing.
With the ignition switched off, it contro ls the
energy s upply to the various e lectrica l compo­
nents . Data from battery diagnosis is consid­
ered.
D epending on the battery's state of charge,
individual consumers are gradually turned off
to prevent excess ive discharge of the battery
and thus mainta in start ing capability.
Dynamic energy management
While the vehicle is being dr iven, dynamic en­
ergy management distributes the energy gen­
erated according to the needs of the individu­
a l components. It regu lates consumption, so
that more electrical energy is not being used
than is being generated and ensures an opti­ mal state of charge for the battery.
(D) 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 16.
What you should know
The highest priority is given to maintaining
starting capability.
The battery is severely taxed in short-distance
driving, in city traffic and during the co ld time
of year. Abu ndant electrical energy is re- quired, but on
ly a little is generated . It is also
critical if the engine is not running and electri­
ca l components are turned on. In this in­
stance energy is be ing consumed but none is
being generated .
It is in precise ly these situations that you will
notice energy management active ly regu lat­
ing the distribution of energy.
Vehicle stands for an extended period
If you do not drive your vehicle over a period
of several days or weeks, e lectrica l compo­
nents are gradually cut back or switched off .
This reduces energy consumption and main­
ta ins start ing capability over a longer period .
Some of the convenience functions may not
operate, such as the interior l ights or the
power seat adjustme nt. The convenience
funct ions will be available again when you
switch on the ignition and start the eng ine.
With the engine turned off
If you listen to the radio, for examp le, w ith
the engine turned off or use other MMI func­
tions, the battery is be ing discharged .
If starting capability is jeopardized due to en­
ergy consumption, the following warning ap­
pears in the MMI display:
Please start the engine soon or the system
will be turned off.
The warning indicates that the system will be
turned off automatically after 3 minutes . If
you w ish to continue using the functions, you
have to start the eng ine.
With the engine running
Although e lectrical energy is generated when
the vehicle is being driven, the battery can be­
come discharged. This happens mostly when
little energy is being generated and a great
deal consumed and the battery's state of
charge is not opt imal.
To bring the energy ba lance back into equili ­
brium, consumers which requ ire espec ially
large amounts of energy are temporar ily cut
back or sw itched off. Heating systems in .,.

particular 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 will be availa­ ble again as soon as the energy balance has
been restored.
You will also notice that engine idle speed has been increased slightly. This is normal and not
a cause for concern . By increasing engine idle
speed the additional energy required is gener­
ated and the battery is charged.
Intelligent technology 197
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