sensor AUDI Q7 2013 Owner´s Manual

192 Airbag system
-Improper repair or disassembly of the
front passenger and driver seat will pre­
vent the Advanced Airbag System from
functioning properly.
- Repairs to the front passenger seat must
be performed by qualified and properly
trained workshop personnel.
- Never remove the front passenger or
driver seat from the vehicle .
- Never remove the upholstery from the
front passenger seat.
- Never disassemble or remove parts from the seat or disconnect wires from it.
- Never carry sharp objects in your pockets
or place them on the seat. If the weight­
sensing mat in the passenger seat is punctured it cannot work properly.
- Never carry things on your lap or carry
objects on the passenger seat. Such
items can increase the weight registered
by the weight-sensing mat and send the
wrong information to the airbag control
unit.
- Never store items under the front pas·
senger seat. Parts of the Advanced Air­
bag System under the passenger seat
could be damaged, preventing them and
the airbag system from working proper­
ly.
- Never place seat covers or replacement
upholstery that have not been specifical­
ly approved by Audi on the front seats.
- Seat covers can prevent the Advanced Airbag System from recognizing child re­
straints or occupants on the front pas­
senger seat and prevent the side airbag in the seat backrest from deploying prop­
erly.
- Never use cushions, pillows, blankets or
similar items on the front passenger
seat. The additional padding will prevent
the weight-sensing mat in the seat from
accurately registering the child restraint
or person on the seat and prevent the
Advanced Airbag System from function­
ing properly.
- If you must use a child restraint on the
front passenger seat and the child re- straint manufacturer's instructions
re­
quire the use of a towel, foam cushion or
something else to properly position the
child restraint, make certain that the
PASSENGER AIR BAG OFF light comes
on and stays on whenever the child re·
straint is installed on the front passen­
ger seat.
- If the PASSENGER AIR BAG OFF light
does not come on and stay on, immedi­
ately install child restraint in a rear seat­
ing position and have the airbag system
inspected by your authorized Audi dealer.
How the Advanced Airbag System
components work together
The front Advanced Airbag System and the
side airbags supplement the protection of­
fered by the front three-point safety belts
with pretensioners and load limiters and the
adjustable head restraints to help reduce the
risk of injury in a wide range of accident and
crash situations. Be sure to read the impor­
tant information about safety and heed the
WARNINGS in this chapter.
Deployment of the Adv a need Airbag System
and the activation of the safety belt preten­
sioners depend on the deceleration measured
by the crash sensors and registered by the
electronic control unit. Crash severity depends
on speed and deceleration as well as the mass
and stiffness of the vehicle or object involved
in the crash .
When the electronic control unit registers a low severity crash and the safety belt is being
used, the airbag will not deploy. If the safety
belt is not being used, the first stage deploys,
followed by the second stage after a much lat· er time in the crash sequence.
If the electronic control unit registers a crash
of medium severity, the first stage of the air ·
bag deploys followed by the second stage at a
much later time in the crash sequence· re·
gardless of whether the safety belt is being
used or not . In higher severity crashes as reg­
istered by the electronic control unit, both the ..,.

away by getting out of the vehicle or
opening windows or doors.
-If you are in a collision in which airbags
deploy, wash your hands and face with
mild soap and water before eating.
- Be careful not to get the dust into you r
eyes, or into any cuts or scratches.
- If the residue should get into your eyes,
flush them with water.
Monitoring the
Advanced Airbag
System
Airbag monitoring indicator light
Two separate indicators monitor the function
of the Advanced Airbag System: the airbag
monitoring indicator light and the
PA SSEN ·
GER AIR BAG OFF
light.
The Advanced Airbag System (including the
e lectronic control unit, sensor circuits and sys­
tem wiring) is monitored cont inuously to
make sure that it is functioning properly
whenever the ignit ion is on . Each t ime you
turn on the ignition, the airbag monitoring in­
d icator light
I will come on for a few seconds
(sel f diagnos tics) .
The system must be inspected when the
indicato r light
I:
- does not come on when the ignit ion is
switched on
- does not go out a few seconds after you
have swi tched o n the ignition, o r
- comes on w hile driving
If an airbag system malfunct ion is detected,
the indicator light will first start flashing to
catch the driver's attention and then stay on
continuously to serve as a constant reminde r
to have the system inspected immediately.
If a malfunction occurs that tur ns the front
a irbag on the passenger side off, the
PAS SEN­
GER AIR BAG OFF
light w ill come on and stay
on w henever the ignition is on.
A irbag system 195
A WARNING
An airbag system that is not functioning
p roperly cannot provide supplemental pro­
tection in a frontal crash.
- If the airbag ind icator light comes on, it
means that there may be something
wrong with the Advanced Airbag System .
I t is poss ible that the ai rbag w ill inflate
when it is not supposed to, or will not in­
fla te when it sho uld.
- Have the airbag system inspe cted imme­
diate ly by yo ur aut ho rized Aud i dea ler.
PASSENGER AIR BAG OFF light
Fi g. 212 Sec tion fro m th e in str um ent pa nel: PASSEN­
GER AIR BAG O FF light
-
T he PASSENGER AIR BAG OFF light is loca ted
i n the center of the instrument pa ne l
¢ fig. 212 .
The PAS SENGER AIR BAG OFF lig ht will come
o n and stay on to tell you when the front Ad­
vanced Airbag on the passenger side has been
turned off by the electronic control unit. Each
t ime yo u turn on the ignition, the
PASSEN·
GER AIR BAG OFF
light will flash for a few
seconds and:
- w ill stay on if the front passenger seat is not
occupied
- w ill stay on if there is a small chi ld or child
restraint on the front passenger seat
- w ill go out if the front passenger seat is oc­
cupied by an adult as registered by the
weight-sensing mat
T he
PASSENGER AIR BAG OFF light must
come on and sta y on
if the ignition is on and ..,.
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196 Airbag sys te m
- a car bed has been insta lled on the front
seat, or
- a rearward-facing chi ld restraint has been
installed on the front passenger seat, or
- a fo rward -facing child restraint has been in­
sta lled on the front passenger seat, or
- the weight registered on the front passen­
ger seat is equa l to or less than the com­
bined weight of a typical 1 year -old restrain ­
ed in one of the rear-facing or forward-fac­
ing infant restraints listed in Federal Motor
Vehicle Safety Standard 208 with which the
Advanced Airbag System in your veh icle was
certified.
If the front passenger seat is not occupied,
the front airbag will not deploy, and the
PAS ­
SENGER AIR BAG OFF
li ght will stay on. Nev­
er install a rearward-fac ing c hild restra int on
the front passenger seat, the safest place fo r
a child in any kind of child restraint is at one
of the seat ing positions on the rea r seat
~ page 186, Child restraints on the front seat
- some important things to know
and
~ page 205, Child Safety.
If the PASSENGER AIR BAG OFF light c om es
on
when one of the conditions listed above is
met, be sure to check the light regularly to
make certain that the
PASSENGER AIR BAG
OF F
light stays on cont inuo usly whenever the
ignit ion is on. If the
PA SSENGER AIR BAG
OFF
light does not appear on and does not
stay on all the time, stop as soon as it is safe
to do so and
- react ivate the system by turning the ignition
off and then turning it on again;
- remove and re insta ll the chi ld restraint .
Make sure that the child restraint is properly
installed and that the safety be lt for the
front passenger seat has been correct ly
routed through the child restra int as descri­
bed in the chi ld restrai nt manufacturer's in­
stru ct ions;
- make sure that the convert ible locking fea­
tu re on the safety belt fo r the front passen­
ger seat has been a ctivated and that the
sa fe ty belt has been pulled tight. The belt
must not be loose or have loops of slack so that the sensor be
low the sa fe ty belt latch
on the seat can do its job~
page 215.
-ma ke sure that things tha t may increase the
weight of the ch ild and chi ld safety seat a re
not being t ransported on the front passen ­
ger seat;
- make sure that the safety belt tension sen ­
sor is not blocked. S hake the safety belt
latch on the front passenger seatback and
forth;
- If a strap or tether is be ing used to tie the
child safety seat to the front passenger
seat, make sure that it is not so tight that it
causes the weight-sensing mat to measure more weight than is act ually on the seat .
If the PAS SENGER AIR BAG OFF light still
does not come on
and does not stay on con­
t in uous ly (when the ignition is switched on),
- take the child restraint off the front passen-
ger seat and install it properly at one of the
rear seat positions. Have the airbag system
inspected by your authorized Aud i dealer
immed iately.
- move the child to a rear seat position and
make sure that the ch ild is properly restra in­
ed in a ch ild restra int that is app rop riate for
its s ize and age.
The
PASSENGER A IR BAG OFF light should
NOT come on when the ignit ion is on and an
adult is s itting in a proper seating position on
t h e front passenge r seat. If the
PASSENGER
AIR BAG OFF
light comes on and s tays on o r
f lashes fo r about 5 seconds w hile d riving, un ­
der these ci rcumstances, make sure tha t:
- the adult on the front passenge r seat is
prope rly seated on the cente r of the sea t
cushion wi th his or her back up aga inst the
backrest and the backrest is not recl ined
~ page 166 , Proper occupant seating posi­
tions,
- the adult is not taking weight off the seat by
holding on to the passenger assist handle
above the front passenger door or support-
ing their weight on the armrest, .,.

-If the ve hicle or the circuit interrupter
is scrapped, all applicable safety pre­
cautions must be followed.
@ For the sake of the environment
Undep loyed airbag modu les and preten­
sioners might be classified as Perchlorate
Material -special handling may app ly, see
www.dtsc.ca.gov/hazardouswaste/per­ chlorate . When the vehicle or parts of the
restraint system including airbag modules
and safety bel ts w ith pretens ioners are
scrapped, a ll applicable laws and regula­
tions must be observed . Your authorized
Aud i dea le r i s familiar w it h these require­
ments and we recommend that you have
your dea le r perform this service for you.
Other things that can affect Advanced
Airbag performance
Changing the vehicle's suspension system can
change the way that the Advanced A irbag Sys­
tem pe rforms in a crash. For example, us ing
tire -r im combinations not approved by Aud i,
l owering the vehicle , changing the stiffness o f
the s uspension, incl uding the springs, s uspen­
sion struts, shoc k absorbers etc. can change
the forces that are measured by the airbag
sensors and sent to the electronic control
un it. Some suspension changes can, for exam­
p le, increase the force levels measured by the
sensors and make the airbag system deploy in
crashes in wh ich it would not dep loy if the
changes had not been made. Ot he r kinds of
changes may redu ce the force levels meas­
ured by the sensors and prevent the a irbag
from deploying when it sho uld .
The senso rs in the safety belt buckle fo r th e
dr iver and front passenger sea t tell the elec­
tronic control module if the safety belt is
l a tched o r not.
If the safety belt is being used,
the front airbag will deploy at a slightly high­
er rate of vehicle deceleration than if the safe ­
ty belt is not being used. Therefore, in a par­
ticular collision, it is poss ible that an airbag
will not deploy at a seati ng position where the
safety belt is being used but will inflate at the
A irba g sy stem 199
position where t he safety be lt is not be ing
u sed. It is important that nothing interfere
with the safety be lt b uckles so that the sen­
sors can send the correct information about
safety belt use to the electronic control un it.
A WARNING
C hanging the vehicle's suspension includ­
ing use of unapprove d tire-r im combina­
tions can cha nge Advanc ed Airbag per­
fo rman ce an d in crease the r isk of se rious
person al injury in a crash.
- Never install suspension components
tha t do no t have the same pe rforman ce
characteris tics a s the co m ponen ts origi­
na lly installed on yo ur vehicle.
- N ever use tire-rim combin ations tha t
have not been approved by Audi.
A WARNING
-
Items stored between the safety be lt
b uckle and the cente r console can cause
the sensors in t he b uckle to send the
wrong information to the e lectronic con­
trol module and prevent the Advanced Air­ bag System from working properly.
-A lways make su re that nothing can inter-
fere with the safety belt buckles and that
they are not obstructed .
Side airbags
Description of side airbags
The airbag system can provide supplemental
protection to properly restrained occupants .
Fig. 2 13 Side a irbag locat io n in t he driver's seat

200 Airbag system
The side airbags are located in the sides of the
front seat backrests ¢
fig. 213 and the rear
backrest* facing the doors. They are ident ified
by the word "AIRBAG".
The side airbag system basically consists of:
-the e lectronic control module and external
side impact sensors
- the two side airbags located in the sides of
the front backrests
- two rear side airbags (as an ordered
option)
-the a irbag warn ing light in the instrument
cluster .
The airbag system is monitored electron ically
to make certain that it is functioning properly
at all times. Each time you turn on the igni­
tion, the airbag system indicator light will
come on for a few seconds (self diagnostics) .
The s ide airbag system supplements the safe­
ty belts and can help to reduce the risk of in­
jury to the driver's, front and rear* passeng­
er's upper torso on the side of the veh icle that
i s struck in a side collision . Th e airbag deploys
on ly in side impacts and only when the veh icle
acceleration registered by the control unit is
high enough . If this rate is below the refer­
ence value programmed into the control unit,
the side airbags will not be triggered, even
though the car may be badly damaged as a re­
sult of the collision. It is not possible to de­
f in e an a irbag tr igger ing range that will cover
every possible angle of impact, since the cir­
cumstances will vary considerably between
one collision and another. Important factors
include, for examp le, the nature (hard or soft)
of the impacting object, the angle of impact ,
vehicle speed, etc . ¢
page 201, Important
safety instructions on the side airbag system .
Aside from their normal safety function , safe­
ty belts work to help keep the driver or front
passenger in position in the event of a side
coll ision so that th e side airbags can provide
protection.
The airbag system is
not a substitute for your
safety be lt. Rather, it is part of the overall oc ­
cupant restraint system in your vehicle . Al­
ways remember that the side airbag system can
only help to protect you if you are wearing
your safety belt and wearing it properly. This
is another reason why you should a lways wear
your safety belts, not just because the law re­
quires you to do so¢
page 175, General
notes .
It is important to remember that wh ile the
s u pplementa l side airbag system is designed
to reduce the likelihood of serious injuries,
other injur ies, for example, swelling, bru is in g,
and minor abrasions can also be assoc iated
with deployed side airbags . Remember too,
s ide airbags will dep loy 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 vehicl e damage are not necessarily an indi­
cation of over-sensitive or failed airbag activa­
t ion. In some coll is ions, both front and side
airbags may inflate . Remember too, that air ­
bags will deploy only once and only in certain
k inds of co llisions -yo ur safety belts are al­
ways there to offer protection in those acc i­
den ts in which airbags are no t supposed to
deploy or when they have already deployed .
The side airbag system will not deploy:
-when the ignition is t urned off
- in side collisions when the acceleration
measured by the sensor is too low
- in front -end collisions
- in rea r-end collisions
- in rollovers .
In some types of accidents the front airbags ,
s ide curtain airbags and s ide a irbags may be
triggered together .
A WARNING
-
-Safety belts and the airbag system will
only provide protection when occupants
ar e in the proper seating position
¢page 201.
- If the airbag indicator light comes on
when the vehicle is being used, have the
system inspected immediately by your
authorized Audi dealer. The airbag may

inflates in side impacts and only when the ve­
hicle acceleration registered by the control
un it is high enough. If this rate is below the
reference value programmed into the contro l
unit, the side airbags will not be triggered,
even though the car may be badly damaged as
a result of the coll ision.
It is not possible to
define an airbag triggering range that will
cover eve ry possible angle of impact, since the
circumstances w ill vary considerably be tween
one co llision and another . Important factors
include, for examp le, the natu re (hard or soft)
of the impacting object, the angle of impact,
veh icle speed, etc. c::>
page 203, How side cur­
tain airbags work.
Aside from the ir normal safety function, safe ­
ty belts work to he lp keep the driver or front
passenger in posit ion in the event of a co lli­
sion so that the side curtain airbags can pro­
vide protection.
The airbag system is not a s ubstitute for your
safety belt. Rather, it is part of the overall oc­
cupant restraint system in your vehicle. Al­
ways remember that the airbag system can
only help to protect you if you are wearing
your safety belt and wear ing it prope rly. Thi s
i s another reason why you sho uld always wear
your safety bel ts, not just beca use the law re­
q ui res you to do soc::>
page 175, General
notes.
It is important to rememb er that while the
side curta in a irbag sys tem is designed to he lp
r educe the like lihood of se rious injur ies, other
in ju ries, for example, swell ing, bruising, and
minor abrasions can also be associated with
these airbags upon deployment. Remember
too, these a irbags w ill dep loy on ly once and
only in certain kinds of accidents - your safety be lts are a lways there to offer protection.
The side curtain airbag sy stem ba sicall y
consi sts of:
- The electronic control mod ule and external
s ide impact sensors
- The side curtain airbags above the front and rear side windows
A irba g sy stem 203
- The airbag indicator light in the instrument
panel
T he airbag system is mon itored e lec tronically
to make ce rtain i t is func tioning prope rly at all
times . Each time you turn on the ignit ion, the
airbag system indicator light will come on for
a few seconds (self diagnostics).
The side curtain airbag i s not activat ed :
- if the ignition is turned off
- in side co llisions whe n the acceleration
measured by the sensor is too low
- in rea r-end collisions.
A WARNING
- Safety belts and the airbag system will
only provide pro te ction when occup ants
are in the proper seating posi tion
c::>
page 71, General recommendations.
- If th e air bag ind icator light comes on
when the vehicle is being used, have the
system inspected immediately by your
authorized A udi dealer . The side curtain
airbag may not work properly even when
the vehicle acce lerat ion in a side collision
is high enough to activate the airbag.
How side curtain airbags work
Side curtain airbags con work together with
side airbags to help reduce the risk of head
and upper torso injuries for occupants who
ore properly restrained.
Fi g. 216 Illustrat io n of pr incip le: Inflated side curtai n
a irbags on the left s ide
-
The side curtain airbags inflate between the
occupant and the windows on the s ide of the
IIJ,,

206 Child Saf ety
- Always install rear-facing child safety
seats on the rear seat.
- If you must install a rearward facing
ch ild safety seat on the front passenger
seat in exceptiona l circumstances and
the
PAS SENGER AIR BA G OFF light does
not come on and stay on, immed iately
install the rear-facing child safety seat in
a rear seating posit ion and have the air­
bag system inspec ted immediately by
yo ur Audi dealer.
_& WARNING
If, in exceptional c ircumstances, you mus t
install a forward -facing child restra int on
the front passenger's seat:
- Always make su re the forward-fac ing
seat has been designed and certified by
its manufacturer for use on a front seat
with a passenger front and side airbag.
- Always follow the man ufacturer's in­
struct ions provided with the child safety
seat or carrier.
- Always move t he passenger seat into its
rearmost position in the seat 's fore and
aft adjustment range, as far away from
the a irbag as poss ible before installing
the ch ild restraint. The backrest must be
adjusted to an upr ight position .
- Always make sure that the
PASSENGER
AIR BAG OFF
light comes on and stays
on all the time whenever the ignition is
switched on.
(D Tips
Always rep lace child rest raints that were
installed in a vehicle during a crash. Dam­
age to a child rest raint that is not visible
could cause i t to fail i n another collisio n
si tua tion.
Advanced front airbag system and
children
Your veh icle is equipped with an "Advanced
A irbag System" in compliance w ith United
States Federal Motor Vehicle Safety Standard (FMVSS) 208 as applicable at the time you
r
vehicle was manufacture d.
T he Adv anced Airbag system in yo ur vehicle
has been certified to mee t the "low-risk" re­
quirements for 3-and 6-year old children on
the passenger side and sma ll adults on the
drive r side. The low r is k dep loyment cr iteria
are intended to red uce the risk of in jury
through interact ion w it h the airbag that can
occur, for example, by being too close to the
steering wheel and instrument panel when
the a irbag inflates . In addition, the syst em
has been ce rtified to comply wit h the "sup­
pression" re quirements o f th e Safety Sta nd­
ard, to t urn off the fron t airbag for infan ts up
to 12 months who are res trained on the front
passenger seat in child restraints that a re list­
ed in the Standard.
E ven though your veh icle is eq uipped wit h an
Advanced Airbag system , a ll children, espe­
cia lly those 12 years and yo unger, should a l­
ways ride in the back seat properly restrained
for their age and size. The airbag on the pas­
senger side makes the front seat a potentially
dangerous place for a ch ild to ride . The front
seat is not the safest p lace for a ch ild in a for­
ward-fac ing ch ild safety seat. It can be a ve ry
dange rous place fo r an infan t or a large r child
i n a rea rward-f acing se at.
Advanced Airbags and the weight­
sensing mat in the front seat
The Advanced A irbag System in your vehicle
detects the presence of an infant or child in a
c h ild restra int on the front passenge r seat us­
i ng the weig ht-sens ing mat in the seat cush ­
ion and the sensor be low th e safe ty belt latch
o n the front passenge r seat that measures t he
tens ion on the s afety be lt.
T he we ight -sensi ng mat measures total
we ight of t he chi ld and the ch ild safety seat
and a c hild b la nk et on the front passenger
seat. The we igh t on the fron t pa sse nger se at
is re late d t o the desig n of the ch ild res trai nt
and its "f ootprint", the s ize and shape o f the
bottom of the chi ld restraint as it sits on the .,..

seat. The weight of a child restraint and its
"footprint" vary for different kinds of child re­
straints and for the different models of the
same kind of child restraint offered by child restra int manufacturers.
The weight ranges for the individual types, makes and mode ls of ch ild restra ints that the
NHTSA has specified in the Safety Standard
together with the we ight ranges of typical in­
fants and typical 1 year -old child have been
stored in the control unit of the Advanced A ir­
bag System . When a chi ld restraint is being
used on the front passenge r seat with a typi­
cal 1 year -old ch ild, the Advanced Airbag Sys­
tem compares the we ight measured by the
weight sensing mat with the information stor­
ed in the electronic control unit.
The electron ic contro l unit al so registers the
tension on the front passenger safety be lt.
The tension on the safety be lt for the front
passenger seat will be different for an adult
who is properly using the safety belt as com­
pared to the tension on the be lt when it is
used to attach a child restraint to the seat.
T he sensor below the latch for the safety belt
for the front seat passenger measures the
tension on the belt . T he input from this sen­
sor is t hen used w ith the we ight to "decide",
whether there is a ch ild restraint with a typ ica l
1 year-o ld 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 manu­
facturer for use with an airbag . Always be sure
that the chi ld restraint is p roperly instal led at
one of the rear seat ing pos itions . If in excep­
tional ci rcumstances you must use it on the
front passenger seat, carefu lly read all of the
information on child safety and Advanced Air­
bags and heed a ll of the app licable WARN­
INGS. Make certain that the child restraint is
correctly recognized by the weight-sensing
Child Sa fet y 207
mat inside the front passenger seat, that the
front passenger airbag is turned off and that
the a irbag status is always correct ly signaled
by the
PAS SENGE R AIR BAG OFF light.
Many types and models of child restraints
have been available over t he years, new mod­
els are introduced regu larly incorporating new
and improved des igns and o lder models are
taken out of product ion. Ch ild restraints are
not standard ized . Child restraints of the same
type typ ically have d ifferent weights and sizes
and different 'footpr ints,' the size and shape
of the bottom of the ch ild restrai nt that sits
o n the seat, when they a re insta lled on a veh i­
cle seat. These diffe rences make it v irtually
impossible to certify compliance with the re­
quirements for advanced airbags with each
and every ch ild restraint that has ever been
sold in the past or will be sold over the course
of the useful life of your veh icle.
For this reason, the United States National
Highway Traffic Safety Adm inistrat ion has
published a list of spec ific type, makes and
models of child restraints that must be used
to certify comp liance of the Advanced Airbag
System in your veh icle with the suppression
requirements of Federal Motor Vehicle Safety
Standa rd 208. These chi ld restraints are :
Subpart A - Car bed child restraints
Model
Angel Guard Angel Ride AA 2403FOF
Manufactured on or
after
September 25, 2007
Subpart B - Rear-facing child restraints
Model Manufactured on or
after
Century SmartF it December 1, 1999
4543
Cosco Arriva September 25, 2007
22-013PAW and base
22-999WHO
Evenf lo Discovery Ad- December 1, 1999
just Right 212
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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. EDRs are sometimes called "crash re­
corders".
Some state laws restrict the retr ieval or down­
loading of data stored by EDRs 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 example, 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.
Intelligent technology 225
Electronic Stabilization
Control (ESC)
General information
The ESC improves the vehicle stability.
. ..---------..
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Fig. 232 Center console with ESC sw itch
ESC is designed to help you maintain vehicle
control in situations where the car approaches
the limits of "grip", especially when accelerat­
ing and cornering. ESC reduces the risk of
skidding and improves stability under all road
condit ions .
The system operates across the entire speed range in combination with the ABS system. If
the Anti-Lock Brake System (ABS) malfunc­
tions, the ESC will also shut down.
How the system works
The Anti-Lock Brake System (ABS), Electronic
Differential Lock (EDL) and the Anti-Slip Regu­
lation System (ASR) are integrated in the Elec­
tronic Stabilization Control. In addition to the
data prov ided by these functions, the ESC con­
trol unit requires additional measurement da­
ta provided by high performance sensors. The
rotational speed of the vehicle about its verti­
cal axis, vehicle acceleration in the fore-and­
aft and lateral directions, the brake pressure and the steering angle are all measured.
T he direction in wh ich the driver wishes to
travel is determined with the aid of the steer­
ing angle and vehicle speed and is continually
compared with the actual behavior of the ve­
hicle. If the two do not match, for example,
when the vehicle starts hydroplaning on a wet
road, ESC will automatically brake the appro-
priate wheel to correct the problem. ..,_
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-Stability is limited in the ESC offroad
mode.
Electronic differential lock (EDL)
The electronic differential lock monitors the
rotational speed of the drive wheels .
General notes
The electronic differentia l lock (EDL) helps the
car to start movi ng, accelerate and climb a
gradient on surfaces providing poor or almost
no grip. Without EDL, this would be difficult,
if not impossible.
H ow the system works
The ED L opera tes automatically. It monitors
the rotat iona l speed of wheels w ith the help
of the ABS sensors¢
page 229. If a noticea­
b le
slip is detected at the wheels (e .g. on slip ­
pery ground
on one side), the spinning whee ls
are braked and power is transferred to the
other wheels. This is done up to a speed of
about
60 mph (100 km/h) . Noises from the
brake system s ignal that wheel sp in is being
controlled.
Dri ving 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
w ith less gr ip, apply
plenty of throttle until
the car starts to move.
O verheating of br akes
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 . T he vehicle remains operational and be­
haves in the same way as a veh icle w ithout
E DL.
As soon as the brake has cooled down, EDL
switches on again automatically .
A WARNING
-When accelerating on slippery surfaces,
such as on ice or snow, always be carefu l
when depressing the acce le rator pedal.
Int ellig ent technolog y 22 7
Even with the EDL working, the drive
wheels can spin and red uce your ab ility
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 condit ions and traffic situation .
(D Tips
If a fault occurs in the ABS, the EDL is also
not functioning. This is ind icated by the
ABS warning light¢
page 18.
Anti-Slip Regulation System (ASR )
The Anti-Slip Regulation System prevents the
driven wheels from spinning when the car is
accelerating .
General note s
The Anti-Slip Regu lation System (ASR) is inte­
grated in the Electronic Stabilization Control
(ESC). When the vehicle starts up and acceler­
ates, the wheels are prevented from spinning
by adjust ing the engine power to match the
amount of grip available from the road sur­
face .
How the sy stem works
ASR performs automat ically, i.e. without the
driver's intervention. With the aid of the ABS
sensors ¢
page 229, ASR monito rs the speed
of the dr iven wheels .
If the wheels start to
spin, engine torque is red uced automat ically
unt il the t ires find enough grip to lock onto
the ro ad surface. The system is active across
the entire speed range.
T he ASR works in conjunction with the ABS. If
a malfunc tion s hou ld occu r in the ABS, the
ASR wi ll also be out of act io n.
A WARNING ~
The increased safety affo rded by ASR does
not mean that you can take safety risks.
A lways adapt your driving sty le to the road
conditions and traffic situation.
Ill--
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