sensor AUDI S6 2009 Service Manual

& WARNING
Changing the vehicle's suspension including u se of unapproved
tire -rim combinations can change Advan ced Airbag performance
and in crease the risk of serious per sonal injury in a crash .
• Never in stall su spension components that do not have the
same pe rformance character istics as the components or iginally
installed on your vehicle.
• Never use t ire-r im combinations that have not b een approved
by Audi.
& WARNING
Items stored between the safety belt buckle and the center
c onsole can cause the sensors in the buckle to send the wrong
information to the electronic control module and prevent the
Adv anced Airbag System from working properly .
• Alway s make sure that nothing can interfere with the safety
belt buckles and that they are not obstructed .
<£> For the sake of the environment
Undeployed airbag modu les and pretens ioners m ight be c lassified
as Pe rchlorat e Mate rial -specia l han dling may a pply, s ee
www.dtsc.ca.gov/hazardouswaste/perchlorate . When the vehicle or
par ts of the re strai nt syste m inc ludi ng airbag m odules and safety
belts with pretensioners are scrapped, all applicable laws and regu ­
la tio ns must be o bse rved. Your autho rize d Audi dealer is fami liar
with these requirements and we recommend that you have your
dea ler perfo rm thi s se rvice for you. •
Safety first
Side airbags
Description of side airbags Airbag
system
T
he airb ag sys tem c an prov ide sup pleme ntal p ro te ction
to prop erly restraine d oc cup ants .
Fig. 214 Side airbag
location in the driver 's
s eat
The side airbags are located in the sides of the front seat backrests
~ fig . 21 4 and the rear backrest * facing the doors . They are identi ­
fied by the word "AIR BAG" .
The side airbag system basic ally consists of:
• t he e le ctr oni c co ntr ol mod ule and e xte rnal side i mpact se nso rs
• the two side airbags located in the sides of the front bac krests
• t wo rear side ai rbags (as an o rder ed
option)
• t he air bag war ning lig ht i n the instru ment cl uster.
The ai rbag sys tem is m onitored e lec tron ica lly to make certa in t hat
it is functioning properly at all times. Each time you turn on the igni ­
tion, t he a irbag sy stem i ndica tor ligh t w ill come on for a few
seconds (se lf diagnostics) .
T he side airbag sy stem su pplements the safet y belts and can help
to reduce t he risk of injury to the driver's , front and rear*
passenger's uppe r torso on the side of the vehicle that is struck in a
s ide co llisio n. T he a irbag dep loys on ly in side im pac ts and only
when the vehic le acceleration registered by the control unit is h igh
~
Vehicle care I I irechnical data

-Air
bag sy ste m ---=---=-----------------
enough. If this rate is below the reference value programmed into
t he control unit, the side airbags will not be triggered, even though
the car may be badly damaged as a result of the collision . It is not
possible to define an airbag triggering range that wi ll cover every
possible angle of impact, since the circumstances will vary consid­
erably between one collision and another . Important factors
include, for example, the nature (hard or soft) of the impacting
object, the angle of impact, vehicle speed, etc.=>
page 233, "Impor ­
tant safety instructions on the side airbag system".
Aside from their normal safety function, safety belts work to help keep the driver or front passenger in position in the event of a side
collision so that the side airbags can provide protection .
The airbag system is
not a substitute for your safety belt . Rather, it
is part of the overa ll occupant restraint system in your vehicle .
Always remember that the side airbag system can on ly help to
protect you if you are wearing your safety be lt and wearing it prop­
erly . This is another reason why you should always wear your safety
belts, not just because the law requires you to do so=>
page 205,
"General notes" .
It is important to remember that while the supplemental side airbag
system is designed to reduce the likelihood of serious injuries, other
injuries, for example, swel ling, bruising, and minor abrasions can
a lso be associated with deployed s ide airbags. Remember too, side
airbags wil l deploy only once and only in certain kinds of accidents
- your safety belts are always there to offer protection.
Vehicle damage, repair costs or even the lack of vehicle damage are not necessari ly an indication of over -sensitive or failed airbag acti ­
vation. In some collisions , both front and side airbags may inflate.
Remember too, that airbags will deploy only once and only in
certain kinds of collis ions - 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 dep loyed.
The sid e a irba g sy stem w ill not deploy :
• when the ignition is turned off •
in side collisions when the acceleration measured by the sensor
is too low
• in front -end collisions
• in rear-end co llisions
• in ro llovers .
In some types of accidents the front airbags, side curtain airbags
and side airbags may be triggered together .
& WARNING
• Safety b elt s and the airbag sy stem will only prov id e prot ection
whe n occ upant s are in the prop er se ating po sit io n
=> page 233 .
• If the airb ag indic ator light come s on w hen the v ehicl e is bei ng
u sed , h av e the syste m inspe cte d immedi ate ly by y our authoriz ed
Audi de aler . Th e ai rbag m ay not w ork properly when the vehicle
a ccel erat ion in a side collision is high e nough to ac tivate th e
a ir bag .•
Hovv supplemental side airbags vvork
Side airbags deploy instantly and can help reduce the risk
of upper torso injuries for occupants who are properly
restrained.
F ig . 2 15 Inf late d sid e
a ir bags o n left side of
v ehi cle, rea r sid e
a ir bag opti on al eq uip-
m ent .,

___ A_ ir_b _a_ g;:::;_ s--:.. y_s _t _e _m _________________________________________________ _
& WARNING (continued)
-Never carry any objects or pets in the deployment space
between them and the airbags or allow children or other
passengers to travel in this position .
• Always use the built-in coat hooks only for lightweight
clothing. Never leave any heavy or sharp-edged objects in the
pockets that may interfere with side airbag deployment and can
cause personal injury in an accident .
• Always prevent the side airbags from being damaged by heavy
objects knocking against or hitting the sides of the seatbacks.
• The airbag system can only be triggered once . If the airbag has
been triggered, the system must be replaced by an authorized
Audi dealership .
• Damage (cracks, deep scratches etc.) to the original seat covers
or to the seam in the area of the side airbag module must always
be repaired immediately by an authorized Audi dealer.
• If chi ldren are seated improperly, their risk of injury increases
in the case of an accident:::::,
page 238, "Child Safety".
• Never attempt to modify any components of the airbag system
in any way.
• In a side collision , side airbags will not function properly if
sensors cannot correctly measure increasing air pressure inside
the doors when air escapes through larger, unclosed openings in
the door panel.
-Never drive with interior door trim panels removed.
- Never drive when parts have been removed from the inside
door panel and the openings they leave have not been properly
closed.
- Never drive when loudspeakers in the doors have been
removed unless the speaker holes have been properly closed .
- Always make certain that openings are covered or filled if
additional speakers or other equipment is installed in the
inside door panels .
& WARNING (continued)
-Always have work on the doors done by an authorized Audi
dealer or qualified workshop . •
Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide supplemental
protection to properly restrained occupants.
B
Fig. 216 Side curtain
airbags , driver 's side:
location
The side curtain airbags are located on both sides of the interior
above the front and rear side windows:::::, fig. 216. They are identi­
fied by the word "AIRBAG" on the windshield frame and the center
roof pillar.
The side curtain airbag system supplements the safety belts and can help to reduce the risk of injury for occupants' heads and upper
torso on the side of the vehicle that is struck in a side collision. The
side curtain airbag inflates only in side impacts and only when the
vehicle acceleration registered by the control unit is high enough. If
this rate is below the reference value programmed into the control
unit, the side airbags will not be triggered, even though the car may
be badly damaged as a result of the collision. It is not possible to
define an airbag triggering range that will cover every possible ..,

angle of impact, s inc e the ci rcumstanc es w ill vary considerably
bet ween one collisi on and another. Important factors include, for
example, the na ture (hard or soft) of the impacting object, the ang le
of impact, vehicle speed, etc.~
page 235, "How side curtain ai rbags
work".
Aside from their norma l safety function, safety be lts work to help
keep the driver or front passenger in position in the event of a col li­
sion so tha t the side curtain airbags can provide protection .
The airbag system is not a substitute for your safety belt. Rather, it
is part of the overa ll occupant restraint system in your vehicle .
Always remembe r that the airbag sy stem can only help to protect
you if you are wea ring your safety belt and wearing it proper ly. This
is another reason why you should a lways wear your safety belts, not
just because the law requires you to do so~
page 205, "General
notes".
I t is important to remember tha t while the side curtain airbag
system is designed to help reduce the likelihood of serious injuries,
other in jur ies, for examp le, swelling, bruising, and minor abrasions
can a lso be associated with these airbags upon dep loyment.
Remember too, these airbags will dep loy only once and only in
certa in kinds o f accidents -your safety belts are always there to
offer protection.
T he side curtain airbag s ystem basi cally consists of :
• T he electronic control module and external side impac t sensors
• T he side curtain airbags above the front and rear side windows
• The airbag indicator light in the instrument panel
T he airbag system is monitored electronically to make certain i t is
functioning prope rly at a ll times. Each time you turn on the ignition,
the airbag system indicator light will come on for a few seconds
(self diagnos tics).
The side curtain airbag is not a cti vated :
• if the ignition is tur ned off,
Safety first
Airb ag sy ste m
• in side collisions when the acceleration measured by the sensor
is too low,
• in front -end collisions,
• in rear -end co llisions,
• in ro llovers .
& WARNING
• Safety belt s and the airbag system will only provide protection
when o ccupant s are in the proper seating position
~ page 80 ,
"General r ecommendation s".
• If the airbag indicator light comes on when the vehic le is being
used , have the sy stem inspected immediately by your authori zed
Audi deale r. The side curtain airbag may not work properly even
when the vehicle a cceleration in a side colli sion i s high enough to
a c tivate the a irbag . •
How side curtain airbags work
S ide cu rtain airbags can work together with si de airb ags
to hel p redu ce the risk of he ad and upper t ors o injuries for
occupants who are properly restrained.
Vehicle care I I
F ig. 217 Illustra tio n of
prin cipl e: Infla ted side
c urta in a irbag s on the
lef t si de ..
irechnical data

-------------------------------------------~C:::.'. h~ i~ ld :::.....:: S~ a~ f~e ~t .!.y __ l!ftlll
& WA RNIN G (continu ed )
• Always install rear-facing child safety seat s on the rear seat.
• If you mu st in stall a re arw ard fa cing child safety sea t on the
front pa ssenger seat in exceptional cir cum stances and the
PASSENGER AIR BAG OFF light doe s not come on and stay on,
immediate ly in sta ll the re ar-facing child safety seat in a rear
s eating po sition and h ave the airbag sy stem inspected immedi ­
atel y by your Audi dea ler .
& WARNING
If, in exceptional circum stance s, you mu st install a forward -facing
c hild re st raint on the fro nt p ass enger's seat :
• Alway s make sure the forward -facing seat has been de signed
and cert ified by it s manufa cturer f or use on a front se at with a
p assenger front and side airbag .
• Always follow the manufacturer's instructions provided with
the child safety seat or carrier.
• Always mov e the passenger sea t into it s rea rmo st p osition in
the seat' s fore and aft adju stment r ange , as far away from the
airb ag as possible before in stalling the ch ild r estr aint . The b ack­
r es t must be adju sted to an upr ight po sition.
• Alway s ma ke sure th at the PASSENGER AIR BAG OFF l ight
c ome s on and stay s on all the time whenever the ignition is
s witched on. •
Advanced front airbag system and children
Your vehicle is equipped with an "Advanced Airbag System" in
compliance with United States Federal Motor Veh icle Sa fety Stan ­
dard ( FMVSS) 208 as applicable at the time your vehicle was manu ­
f actured .
Controls and equip­ ment Safety first Vehicle operation The Advanced Airbag system in your vehicle has been certified to
meet the " low -risk" requirements for 3 and 6 year -old children on
the passenger side and small adu lts on the driver side. The low risk
deployment crite ria are intended to reduce the risk of injury th rough
interaction with the airbag that can occur, for example, by being too
close to the steering wheel and instrument panel when the airbag
inf lates . In addit ion, the system has been cert ified to comply with
the "suppression" requirements of the Safety Standard, to turn off
the front airbag for infants up to 12 months who are restrained on
the front passenger seat in child restraints that are listed in the
Standard.
Even though your vehic le is equipped with an Advanced Airbag
system, all children, especially those 12 years and younger, should
a lways ride in the back seat properly restrained for their age and
s ize . The airbag on the passenger side makes the front seat a poten­
tia lly dangerous p lace for a chi ld to ride. The front seat is not the
safest p lace for a child in a forward -facing child safety seat. It can be
a very dangerous place for an infant or a larger child in a rearward­
facing seat. •
Advanced Airbags and the weight-sensing
mat in the front seat
The Advanced Airbag System in your vehicle detects the presence
of an infant or child in a chi ld restraint on the front passenger seat
using the weight -sensing mat in the seat cushion and the sensor
below the safety belt latch on the front passenger seat that
measures the tension on the safety be lt .
The weight -sensing mat measures t otal weight of the child and the
child safety seat and a chi ld blanket on the front passenger seat. The
we ight o n the front passenger seat is related to the design of the
child restraint and its "footprint" , the size and shape of the bottom
of the child restraint as it sits on the seat. The weight of a child
restraint and its "footprint" vary for different kinds of child
~
Vehicle care Do-it-yourself service Technical data

-Child Safety -----<------------------------------
restraints and for the different models of the same kind of child
restraint offered by child restraint manufacturers.
The weight ranges for the individual types, makes and models of
child restraints that the NHTSA has specified in the Safety Standard
together with the weight ranges of typical infants and typical 1 year­ old child have been stored in the control unit of the Advanced
Airbag System. When a child restraint is being used on the front passenger seat with a typical 1 year-old child, the Advanced Airbag
System compares the weight measured by the weight sensing mat
with the information stored in the electronic control unit.
The electronic control unit also registers the tension on the front
passenger safety belt. The tension on the safety belt for the front
passenger seat will be different for an adult who is properly using
the safety belt as compared to the tension on the belt when it is
used to attach a child restraint to the seat. The sensor below the
latch for the safety belt for the front seat passenger measures the
tension on the belt . Th e input from this sensor is then used with the
weight to "decide" , whether there is a chi ld restraint with a typica l 1
year-old child on the front passenger seat and whether or not the
airbag must be turned off.•
Child restraints and Advanced Airbags
Regard less of the child restraint that you use, make sure that it has
been certified to meet United States Federal Motor Vehicle Safety
Standards and has been certified by its manufacturer for use with
an airbag. Always be sure that the child restraint is properly
installed at one of the rear seating positions. If in exceptional
circumstances you must use it on the front passenger seat, carefully read all of the information on child safety and Advanced Airbags
and heed all of the applicable WARNINGS. Make certain that the
child restraint is correctly recognized by the weight -sensing mat
inside the front passenger seat, that the front passenger airbag is
turned off and that the airbag status is always correctly signaled by
the
PASSENGER AIR BAG OFF light . Many
types and models of child restraints have been available over
the years, new mode ls are introduced regularly incorporating new
and improved designs and older models are taken out of produc­
tion. Child restraints are not standardized. Child restraints of the
same type typically have different weights and sizes and different
'footprints,' the size and shape of the bottom of the child restraint
that sits on the seat, when they are installed on a vehicle seat. These
differences make it virtually impossible to certify compliance with
the requirements for advanced airbags with each and every child
restraint that has ever been sold in the past or will be sold over the
course of the usefu l life of your vehicle.
For this reason, the United States National Highway Traffic Safety
Administration has pub lished a list of specific type, makes and
models of child restraints that must be used to certify compliance
of the Advanced Airbag System in your vehicle with the suppression
requirements of Federal Motor Vehicle Safety Standard 208. These
child restraints are:
A. Car beds, manufactured on or after September 1,
2004:
• Cosco Dream Ride 02-719
B. Rear facing child restraint systems, manufactured
on or after September 1, 2004:
(When the restraint system comes equipped with a removable base,
compliance has to be certified with or without the basel.
• Britax Handle with Care 191
• Century Assura 4553
• Century Smart Fit 4543
• Cosco Arriva 02727
• Evenflo Discovery Adjust Right 212
• Evenflo First Choice 204
• Graco Infant 8457

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
Intelligent technology
Notice about data recorded by
vehicle control modu les
Your vehicle is not equipped with an Event Data Recorder (EDR),
installed by some manufacturers for the express purpose of
capturing data for retrieval after an accident or crash event . EDR's
are sometimes called "crash recorders" .
Some state laws restrict the retrieva l or downloading of data stored
by EDR's that were insta lled 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 electronic control modules for various vehicle systems such as, for example, engine function, emission control, as
well as for the airbags and safety belts.
These electronic control modules also record vehicle-related data during norma l vehicle operation for diagnost ic and repair purposes .
The recording capacity of the electronic control modules is limited
to data (no sound is recorded) and only a small amount of data is
actually 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 well as restraint system use and performance in the
event of a crash or other condition . Stored data can only be read and
down loaded with special equipment .•
Electron ic Stabilizat ion Program (ESP)
General =nformation
The ESP improves the vehicle stability.
(
Fi g. 232 C ente r
co nso le w it h ES P
swi tch
ESP is designed to he lp you maintain vehic le control in situations
where the car approaches the limits of "grip", especia lly when
accelerating and cornering. ESP reduces the risk of skidding and
improves stabil ity under all road conditions .
T he system operates across the entire speed range in combination
with the ABS system. If the Anti-Lock Brake System (ABS) malfunc­
tions, the ESP wil l also shut down .
How th e sys te m w ork s
The Anti -Lock Brake System (ABS) , Electronic Differential Lock (EDU
and the Anti-Slip Regulation System (ASR) are integrated in the e lec­
tronic stabi lization program . In addition to the data provided by
these functions, the ESP control unit requires additional measure­ ment data provided by high performance sensors . The rotational
speed of the vehic le about its vertical axis, vehicle acce leration in
the fore-and-aft and lateral directions, the brake pressure and the steering angle are al l measured .

The direction in which the driver wishes to travel is determined with
t he aid of the steering angle and vehicle speed and is continua lly
compared with the actual behavior of the vehicle. If the two do not
match, for example, when the vehic le starts hydrop laning on a wet
road, ESP will automatically brake the appropriate whee l to correct
the prob lem.
The vehicle is then stab ilized by the forces acting on the whee l
during braking. If the vehicle is
oversteering (rear tends to skid out
of the turn), the brakes are mainly app lied on the wheel that is on
the outside of the curve. In the case of a vehicle that is
understeering
(tendency to sl ide out of the curve), the brakes are applied at the
rear wheel that is on the inside of the curve . An acoustic signal indi­
cates when ESP brake application cuts in
~ & .
The system operates across the entire speed range in combination
with the ABS system
~ page 266 . If the Anti -Lock Brake System
(ABS) malfunctions, the ESP wi ll be out of action as well.
Ac tivat ing
When you turn on the eng ine, ESP will automatically be activated
and will perform a se lf -test . As soon as the test is comp leted, the
system is in norma l operating mode.
You can activate a deactivated ESP or deactivated ESP/ASR if required by pressing the~
page 262, fig. 232 button . When they are
activated, the message
E S P/AS R on appears briefly in the display.
D eactiv ating
The ESP should normally be activated al l the time . If necessary, you
can deactivate An ti- Slip Regulation (ASR) or the E lectronic Stabiliza ­
tion Program (ESP) by pressing the button~
page 262, fig. 232 .
• Dea ct iv at ing A SR: Tap the button . In certain exceptional situa ­
tions (e.g. driving with t ire chains) , the Anti-Sl ip Regulation (ASR)
can be deactivated ~
page 264. The message ASR off appears in the
display as we ll.
• Dea ctiv at ing E SP/ASR Press the button for more than 3 seconds.
With the ESP/ASR deactivated, the ESP check light comes on, see
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
~ page 18 . The message ES P sw itched off appears in the disp lay as
we ll.
& WARNING
The Electroni c Stabili zation Program i s never thele ss subject to the
la ws o f physics . It is p articularl y import ant t o pay a ttent ion t o th is
f a ct on wet and slippery road s. It is ther efore important tha t y ou
a lw ays a dapt your dr iving to the c ondit ion of th e ro ad and t raffi c
c ondition s. Do n ot allow the inc rea sed safety pro vided b y th e Elec ­
tr on ic S ta bili zatio n Pr ogram sys tem to lull you in to acc epting
add iti onal safet y risk s. C
Electronic differential tock (EDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
Gener al note s
The electronic differential lock (EDU helps the car to start moving,
accelerate and c limb a gradient on surfaces providing poor or
almost no grip . Without EDL, this would be difficult, if not impos ­
sib le .
How th e sys te m wo rk s
The EDL operates automatical ly . It monitors the rotational speed of
the drive wheels on an axle with the he lp of the ABS sensors
~ page 266 . If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground
on
one side),
the spinning wheel is braked, thereby transferring power
to the other drive wheel or whee ls (a ll -whee l drive) . Th is is done up
to a speed of about 60 mph ( 100 km/h). Noises from the brake
system signal that wheel spin is being control led .
Dr iving off
When driving off , always be sure to keep road conditions in mind as
you accelerate. If one drive wheel spins because it is on a surface
Iii>
Vehicle care Do-it-yourself service Technical data

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with less grip, gradually increase the pressure on the accelerator
pedal until the car starts to move.
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads on this wheel, the EDL cuts out tempo ­
rarily. The vehicle remains operational and behaves in the same way
as a vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto ­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your
ability to control your car. Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning. This is
indicated by the ABS warning light=>
page 21. •
Ant"-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler ­
ates, the wheels are prevented from spinning by adjusting the engine power to match the amount of grip available from the road
surface.
How the system works
ASR
performs automatically, i.e. without the driver's intervention.
With the aid of the ABS sensors=>
page 266, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
torque is reduced automatically until the tires find enough grip to
lock onto the road surface. The system is active across the entire
speed range.
Th e ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action.
Activating
The ESP is automatically activated when the engine is started and it
performs a self -test . You can activate a deactivated ASR if required
by pressing the =>
page 262, fig. 232 button . When it is activated,
the message
ESP/ASR on appears briefly in the display. Vehicles
with front-wheel drive a deactivated ASR automatically re-activates
itself at a speed of 40 mph (70 km/h) .
Deactivating
You can deactivate the ASR if required by pressing the button (for
less than 3 seconds)=>
page 262, fig. 232. With the ASR deactivated,
the ESP check light comes on, see=>
page 18. The message ASR off
appears in the display as well. On vehicles with front-wheel drive:
deactivation is possible only up to 30 mph (50 km/h) for safety
reasons . Vehicles with all -wheel drive: the ASR can be deactivated
at any speed .
The ASR should normally be activated all the time. Only in certain
exceptional situations when some slip is desirable does it make
sense to deactivate the ASR. Examples:
• when driving with tire chains
• when driving in deep snow or on loose ground and
• when rocking the vehicle loose after it has become stuck .

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 conventional energy system is not driven for a
long period of time, the battery 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 engine .
Intelligent energy management in your vehicle handles the distribu ­
tion of electrical energy . Starting ability is markedly improved and
the life of the battery is extended.
Basical ly, energy management consists of
battery di agn osis, idling
current mana gement
and dynami c en ergy management .
Batter y diagn osis
Battery diagnosis continuously deter min es the state of the battery.
Sensors determine battery vo ltage, battery current and battery
temperature . This determines the cu rrent state of charge and the
power of the battery .
Idling c urrent man ag em en t
Idling current management reduces energy consumption while the
vehicle is standing. With the ign it ion switched off, it controls the
energy supply to the various electrical components. Data from
battery diagnos is is considered .
Depending on the battery's state of charge, individual consumers
are gradually turned off to prevent excessive discharge of the
battery and thus maintain starting capability.
Dynamic energ y managem ent
While the vehic le is being driven, dynamic energy management
distributes the energy gene rated acco rding to the needs of the indi -
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
vidual components . It regulates consumption, so that more e lec­
trical energy is not being used than is being ge nerated and ensures
an optimal state of charge for the battery.
[ i ] Tips
• But even energy management cannot negate the limits of
physics. Consider that the power and life of a battery are limited .
• I f starting ability is threatened, you are informed by a warning
=> page 270, "Drive r notifica tion i n the instrument cluster
display" .•
What you should know
The highes t pri ority is given to main tain ing starting capa ­
bility.
The battery is severe ly taxed in short-distance driving, in city traffic
and during the co ld time of year. Abundant electrical energy is
required, but only a little is generated. It is also critical if the engine
is not running and elect rica l components are turned on. In this
instance energy is being consumed but none is being generated .
I t is in precisely these situations that you will notice energy manage ­
ment active ly regula ting the distr ibut ion of energy.
Vehicle stands fo r an extended period
If you do not drive your vehicle over a period of several days or
weeks, electrical components are gradually cut back or switched off.
This reduces energy consumption and maintains starting capability
over a longer period.
Take into considerat ion that when you un lock your veh icle, some
convenience functions, such as the remote key or power seat
adjustment, may not be availab le . T he conven ience functions will be
available again when you turn on the ignition and start the engine.
Vehicle care Do-it-yourself service Technical data