brake sensor AUDI S6 2009 Owners Manual

Ignition lock malfunction ~
A malfunction in the ignition Jock must be repaired imme­diately.
If the ~ symbol in the display blinks, there is a malfunction
in the electronic ignition lock. An additional driver message
can also be displayed by press ing the [CHECK] button:
Ign iti on lock defe ctive . C ont ac t wo rkshop !
- Do not turn the engine off.
- Drive immediately to an auth orized A udi dealer to have
the malfunction corrected .
If there is a malfunction in the electronic ignition lock, the ignition
cannot be turned off . Drive immediately to an authorized Audi
dea ler to have the cause of the malfunction corrected .
On vehicles with Convenience key*, the engine should not be
switched off using the [
STOP] button because the engine cannot be
started again after the ignition is switched off. •
Yellow symbols
A yellow symbol means WARNING.
Contro ls and eq uip­
ment
Fig . 19 Dis pl ay: low
fu el le ve l wa rning
(pr io rity 2)
Dri ver inf orm atio n di spl ay
Ye llow symbols indicate a priority 2 malfunction -Warning!
When a yellow warning symbol appears,
one warning tone sounds.
A driver message appears as well to explain the malfunction in more detail. The driver warning goes out after about 5 seconds, but it can
be brought up again at any time by pressing the [ CHECK
I button .
Check the displayed function as soon as possible . If
more than one
priority 2 malfunction is detected , a ll symbols will appear one after
the other for about 2 seconds.
Yellow symbols mean:
Convenience key*
~ page 120
Key not in vehicle
USA models: ~ page25
Defective brake light
Canad a mod els: ~ page25
Defective brake light
11 Defective light bulb
~ page25
-
Light/rain sensor defective ~ page34
Windshield washer fluid ~ page34
level low
Low fuel leve l
~ page34
Battery voltage ~ page35
Worn brake pads ~ page35
IIDynamic headlight range ~ page35
control defective
-
Check engine oi l level ~ page35
~ page305 ...
Vehicle care I I irechnical data

Driver inf ormati on displ ay
Engine oil sensor malfunction => page 35
._ -
Engine speed limitation* => page 36
--Adaptive Light* defective :::::, page 36
Ignition lock malfunction :::::, page 36
--Windshield wiper defective :::::, page 36
Tire pressure monitoring sys -:::::, page 337
tern
Loss of tire pressure
Tire pressure monitoring sys -:::::, page 337
tern
System not available
Ba ttery in remote control key
--Electromechanical
parking brake
Automatic transmission ma l­
function
A pplies to vehi cles : wi th Conven ien ce key
Key not in vehicle
K ey not in vehicle
=> page 43
=> page 123
:::::, page 160,
=> page 167
-
-
-
-
This reminder appears along with the.., symbol if the master key is
removed from the vehicle with the engine running. It is intended to
remind you (e.g . when changing drivers) no t to continue the journey
without the master key.
If the master key is no longer in the vehicle, you cannot switch off
the ignition after stopping the engine and you also cannot start the
•
engine again . What is more, you cannot lock the vehicle from the
outside. •
Light/rain sensor defective
Au tomat ic he adl ight s/au tomatic wiper s defec tive
If the symbo l illuminates, the light sensor has failed . For safety
reasons the low beams are turned on permanently with the switch
in
AU TO . However, you can continue to turn the lights on and off
using the light switch. In the case of a defect in the rain sensor, the
windshie ld wiper lever functions are still available. Have the
light/rain sensor checked as soon as possible at a dea lership .•
Windshield washer fluid level too low "')
U Please top up washer fluid
If the symbol il luminates, add windshield washer fluid to the washer
system and also to the headlight washer system:::::,
page 316. •
Fuel supply too low Q.)
L Pl ea se refuel
When this symbol il luminates for the first time, the fue l reserve
in your vehicles is still about 2 Gal lons (7 to 9 litersl. Refuel as soon
as possible :::::,
page 296.
If the symbo l lights up, even when there is ample fue l in the tank,
and the text
T an k s yste m m alf un ction ! Cont act w orks hop appears
in the display, there is a fault in the system. Contact a qualif ied work ­
shop to have the fault rectified .•

Battery voltage ~
If the battery's state of charge is not in the optimal range, the
symbo l is shown in the display and the driver message
Low battery
c harge : battery will be charged wh ile dr iving
appears .
Whi le th is d river notification is displayed, you have to be p repa red
for limited starting capabi lity.
Driver message appears and goes out again
If this driver message appears after the ignition is turned on or
w hile driving and it g oes out agai n after a w hile , th e ba tte ry has
been adequately recharged.
Driver message appears and does not go out again
I f this dr iver notification appears after the ignition is turned on or
while driv ing and does n ot go out aga in, the bat tery's state of
charge is not in the optimal range. Starting capability is restricted.
H ave the ba ttery checke d by an au tho rize d Audi deale r as soon a s
poss ible .•
Worn brake pads
Brake pads!
If the wa rning light i lluminates, immediate ly contact your autho ­
rized Aud i d eal er or qualified wor kshop to have a ll brake pads
inspected. On USA models the warning light comes on together
wit h the warning light
BRAKE . Both sets of brak e pads o n an a xle must
a lways be replaced at the same time.
& WARNING
Driving with bad brakes can cause a collision and serious personal
injury.
• If the warning light • and the warning light
BRAKE11 with the
message Brake pads ! comes on in the instrument cluster display ,
Controls and equip ­
ment
Driv er information display
& W ARNING (continued )
immediately contact your author ized Audi dealer or qualified
workshop to have all brake pads checked or replaced if necessary .•
Headlight range control defective ">
l ) Headlight range control defective
If th e sy mbol ill uminates , the dyna mic headlig ht ra nge c ont rol is n o
longer working properly . Have the system checked and repa ired at
yo ur Au di d eale r.•
Engine oil level "'·
Please check oil level
When the symbol il luminates, check the engine o il leve l as soon as
possible =>
page 305. Top off the oi l at your earliest opportu nity
=>
page 306. •
Engine oil sensor defective ~,m,
Oil level! sensor defective
If the symbo l il luminates, contact your authorized Audi dealer and
h ave th e oil sensor insp ecte d. Unt il y ou hav e thi s do ne, c heck the oil
leve l each time you refue l just to be on the safe side=>
page 305. •
11 BRAKE : USA models only
I • •

• .___A_ d_a_ p:- t_iv _ e_ C_ r_u _is _ e_C_ o_ n_ t_ r_ o_ l --------------------------------------------
& WARNING (continued)
• Never allow the closing speed between you and other vehicles
to be so high that the Adaptive Cruise Control may not be able to slow your vehicle safely. If closing speed is too high , you must
apply the brakes yourself to reduce the risk of a rear -end crash.
• Never rest your foot on the accelerator pedal, especially when
the Adaptive Cruise Control is being used. Pressure on the acceler ­
ator will override the ACC braking function and prevent the brakes
from being applied when ACC detects a situation when the brakes must be applied .
• Never use Adaptive Cruise Control when you cannot drive
safely at a steady speed, including on city streets, on winding
roads or when road conditions are poor (for example, on ice,
gravel, in fog, heavy rain or on wet roads that increase the risk of
hydroplaning).
• The radar sensor's
vision can be reduced by rain, snow and
heavy road spray. These and similar conditions can prevent vehi ­
cles up ahead from being accurately detected and in some cases
they may not be detected at all. Do not use ACC when the radar sensors cannot accurately detect vehicles moving ahead of you in
traffic.
• Always turn off Adaptive Cruise Control when entering turn
lanes, exit lanes and construction zones or in similar situations
because the vehicle will automatically accelerate to the stored
speed when the road ahead is clear.
• To prevent unintended operation, always switch ACC off when
it is not being used.
[ i) Tips
• For safety reasons, the stored speed is deleted when the ignition
is turned off .
• The Electronic Stabilization Program (ESP) and the Anti-Slip
Regulation (ASR) cannot be deactivated when the Adaptive Cruise
Control is switched on. If the ESP and the Anti-Slip Regulation (ASRI has been deactivated and you then switch on the
Adaptive Cruise
Control, the ESP function will also be activated automatically.
• Damage caused by accidents and some minor collisions can
affect the radar sensor settings and cause the system to malfunc­
tion or switch off completely.
• The radar sensor cover is heated. In winter conditions, you
should still check before driving to make sure it is free of ice and
snow. If necessary, clean the area near the radar sensor carefully
=>
page 127, fig. 123.
• To ensure that the radar sensor is not blocked, foreign objects
(e.g. stickers, larger license plate mounts, add -on parts) must not
cover the area near the radar sensor=>
page 127, fig. 123. The area
near the radar sensor must not be painted, either.
• For Declaration of Compliance to United States FCC and Industry
Canada regulations =>
page 375. •
Applies 10 veh ic les: w ith Ada ptive Crui se Contro l
How does Adaptive Cruise Control work?
Vehicles traveling ahead are detected with the aid of a
radar sensor.
Fig. 124 Basic prin­
ciple diagram : Radar
sensor measurement
range
Adaptive Cruise Control uses a radar sensor in the front of the
vehicle=> fig. 124. Th e system has limitations=>
page 140. Things
that are not moving in your lane and in your direction of travel will
~

Adaptiv e Crui se Contro l IIJ!IIIII ---------------------------------..:....:.:=:...:.;_;....::.....::...._ \
_______ _
not be detected. The sensor measures the distance to reflective
surfaces that must have a certain size. The system responds only
after the distance measurement has been made . If a measurement
is not possible, the system cannot respond and wil l not react to a
vehicle or something else up ahead.
O pen ro ad
When the road is clear, the Adaptive Cruise Control works like cruise
control. It main tains a constant target speed specified by the driver.
D riv in g in tr affic
If a slower vehic le driving ahead is detected, the Adaptive Cruise
Control dece lerates (within the limits of the system)::::;,
page 138,
"Driver intervention prompt" and::::;, page 140, "System limitations"
to its speed and after adjusting, tries to maintain the set distance
from the vehicle ahead . The vehicle may temporarily drive s lower
than the set speed while adjusting::::;,
& in "Description" on
page 127.
If the vehicle in front accelerates, Adaptive Cruise Control a lso acce l­
erates up to the speed that you have set.
Sit uation s re qui ring d rive r int erve ntion
In some situations you will have to use the footbrake to s low the
vehicle down in order to keep a safe distance from vehic le in front
of you or to avoid a rear -end collision. In this situation, a symbol
appears and a warning tone sounds::::;,
page 138.
P assing anoth er veh icle
If you move into the pass ing lane and no vehicle is detected ahead,
the Adaptive Cruise Control accelerates to the speed you have set
and ma intains it.
O ve rridin g ACC
You can increase your speed at any time by stepping on the acceler­
ator pedal. After you re lease the acce lerator pedal, the system
adjusts back down to the speed you previously set.
Controls and equip ­
ment R
edu cin g s topping di sta nce
If the radar sensor detects that the distance to the vehicle ahead is
less than defined minimum distance, the brakes are automatical ly
prepared for emergency braking by the driver . The brake pads are
moved very c lose to the brake discs without actual ly braking the
vehic le. This brake assistant feature reacts more quick ly to the
driver's braking, and also works when Adaptive Cruise Control is off.
The stopping distance is reduced as a result of this advance brake
preparation. This function does not perform any emergency brak ing
maneuvers by itself; the driver must always app ly the brakes.
& WARNING
• Never r ely on the d istan ce control feature of ACC alone t o
p re vent re ar- end colli sio ns. Alwa ys be prep ared t o br ake and take
eva sive ac tion to a void colli sio ns and ot her acc ident sit uation s.
• Never allo w the clo sing sp ee d b etwe en you and other vehi cle s
to be so hi gh th at th e Ada ptive Crui se Control may not b e able to
s low your vehicl e safely . If clo sing spe ed i s too h igh , you must
a pp ly the brake s yours elf to reduce the risk of a rea r-end cras h.
[ i ] Tip s
Please note that the amount of acceleration the Adaptive Cruise
Contro l uses depends on the Distance setting selected . DISTA NCE 1
gives you acceleration that is dynamic and sporty . D ISTANCE 4, on
t he o ther hand, gives more moderate acce leration. For more infor ­
mation about the time intervals::::;,
page 133, "How is the distance
(time interval) set?" .
• Please note that if the Adaptive Cruise Control has begun braking
t he vehicle and the driver chooses to brake the vehicle additional ly,
the brakes may feel "hard". This is simply due to the pressure build ­
up of the initial braking .
• Adaptive Cruise Control is switched off after pressing the foot­
brake . The speed saved up this point can be resumed. To resume the
saved speed, release the brake pedal and pu ll the control lever _.,
I • •

• ..__A_ d_a...: p:,..._ ti_v _ e_ C_ ru_ is_ e_ C_ o_n_ t_ r_ o _ l ___________________________________________ _
tained. The ACC system is not switched off, and increased attention
to the traffic situation is absolutely necessary. The following may be
reasons why the message
ACC functionality limited appears:
• The ACC sensor is dirty . The ACC system is not reacting, or is not
reacting correctly, to moving vehicles up ahead in your lane of
travel.
• There may be very light traffic on and there is nothing that marks
the side of the road (for example, guard rails, traffic signs, trees). As
soon as a moving vehicle up ahead is detected again, ACC becomes
active again and the message disappears .
The ACC sensor is located in the area under the front license plate.
If the ACC sensor is dirty or blocked, clean the area to restore system
operation.
ACC not available
The text message ACC not available appears, for example, if the
temperature of the brakes is excessive . Adaptive Cruise Control is
temporarily not available. A warning tone sounds as a reminder.
ACC not available!
The text message ACC not available! appears in the event of a
malfunction. Adaptive Cruise Control is turned off. A warning tone
sounds as a reminder. Have the system inspected by a qualified
dealership .
ACC sensor blocked !
The text message ACC sensor blocked ! appears when the ACC
System can no longer accurately detect vehicles moving up ahead
in your lane of travel. Adaptive Cruise Control is turned off. A
warning tone a lso sounds as a reminder.
To decide whether it is necessary to switch off the ACC (ACC sensor blocked
!) or if it is only a temporary condition (ACC Functionally
limited), the system will also takes into consideration the outside
temperature and/or the windshield wiper operation.
The ACC sensor is dirty or blocked (e.g. leaves, snow) . The
ACC sensor is located in the area under the front license plate .
If the ACC sensor is dirty or blocked, clean the area to restore system
operation.
EPB activation
Th e text message EPB activation appears if emergency braking was
manual ly initiated with the Electromechanical Parking Brake (EPB).
The Adaptive Cruise Con trol is turned off . This is accompanied by a
warning tone.
Speed
The set speed in mph (Canada km/h) always appears when saving or
changing the speed in Adaptive Cruise Control~
page 130 , "How is
the speed stored?" and~
page 131 , "Changing stored speed".
Selector lever position!
The text message Selector lever position! appears when the
selector lever is moved to position
N. In this position, Adaptive
Cruise Control is not available. •
Applies to vehicles : with Ada ptive Cruise Cont rol
Driver intervention prompt
The driver intervention prompt calls on the driver to take
over the situation.
Fig . 134 Instrument
cluster: Driver inter-
vention prompt
~

• ..__A_ d_ a-:.. p_t _iv _ e_ C_r_ u_ i _s _ e_ C_ o_n_ t_ r_ o_ l _____________________________________________ _
Sav ing s etting s
Your individual settings are automa tically saved and assigned to the
remote control key being used {remote key storage). If the key is
given to another person, the saved settings remain as they are. •
System limitations
Applies to vehic les : with Adapt ive Crui se Co ntro l
General information
The radar sensor has limits that the driver must know to
b e able to use AC C properly.
The Adaptive Cruise Control works within limits that are also re lated
to radar sensor range and sight d istance. In some situations ACC
may react unusually or late from the driver's point of view. There ­
fore, always be attentive to what is happening around you and
a lways be ready to in tervene, if necessary:
• when driving around curves=>
page 140
• whe n vehicles up front are not in line with y our vehicle
=>
page 141
• when other vehicles a re changing lanes => page 141
• when other vehicles are difficu lt to detect => page 141.
• when vehicles up ahead are not moving or obstacles are in your
travel lane=>
page 141
& WARNING
The radar sensor's function and range can be r educed by rain ,
sn ow and he avy spray. Moving vehicles up ahead may not be
promptly det ected or ma y not be det ected at all.
• Alway s pay careful attention to the traffi c situatio n a nd be
ready to intervene and be ready to take complete contr ol when ­
e ver ne ces sary . •
Ap plies to veh ic les: with Ad apt ive Crui se Contro l
When driving around curves
k::;=========== =,!
~
[J
Ent ering a cur ve
Fi g. 13 6 Veh icle
e nteri ng a curv e
Fig. 137 Ve hicle
l ea ving a curv e
When entering a curve, the Adaptive Cruise Control may react to a
vehicle in the next lane and apply the brakes in your vehicle
=> fig. 136. The braking action can be overridden by depressing the
acce lerator pedal.
Lea vin g a c urve
At the end of very long curves, ACC 's predictive lane reading can
cause ACC to react to another vehicle in the next lane and apply t he
brakes on your vehicle=> fig. 137 . T he braking action can be over ­
ri dden by depressing t he accelerator peda l.•

___ 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

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
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 .