2009 AUDI Q7 differential

Instruments and warning/indicator lights
• It comes on for approximately 15 seconds as a warning of
reduced ground clearance, if the dynamic mode is activated and if
the ignition is switched on~
page 207, "Chassis controls".
• If the warning/indicator light flashes in conjunction with the ;,
warning/indicator light, you should not drive the vehicle immedi­
ately in order to prevent damage to the underbody. The two
warning/indicator lights flashing together points to an extreme Low
level. A very
pronounced lowering of the vehicle (extreme Low level)
can result, for example, from a heavy load. As soon as the level has
returned to normal, the warning/indicator lights stop flashing, and
you can drive away.
0 Note
If the warning/indicator light flashes in conjunction with the
warning/indicator light, you should not drive the vehicle because
low-lying vehicle parts can bottom out as you drive over uneven
ground and be damaged as a result. •
High beam ~D
The ~D warning/indicator light illuminates when the high beams are
on or when you use the headlight flasher. For more information
about using the high beams, see~
page 77. •
Cruise control
CRUISE (USA models) /(7)'2 (Canada models)
The warning/indicator light illuminates when the cruise control is
activated. •
Anti-lock brake system (ABS)
.. c_ (USA models)/ ~ (Canada models)
This warning/indicator light monitors the ABS and the
electronic differential lock (EDL).
The warning/indicator light will come on for a few seconds when the
ignition is switched on . The light will go out after an automatic
check sequence is completed.
There is a malfunction in the ABS when:
• The warning/indicator light does not illuminate when you switch
on the ignition .
• The warning/indicator light does not go out after a few seconds.
• Th e warning/indicator light illuminates while driving.
The brake system will still respond even without the assistance of
the ABS system. See your authorized Audi dealer as soon as
possible to restore full braking performance.
For more information
regarding the ABS~
page 292.
The ABS warning light and the brake warning light come on
together. The ABS will not work and you will notice a change in
braking response and performance .
Malfunction in the brake system
If the brake warning light~ page 23and the ABS warning illuminate
together there may be a malfunction in the ABS, and there may also
be a malfunction in the brake system itself~& .
In the event of a
malfunction in the brake system the warning/indi ­
cator light
BRAKE (USA models)/ ((D) !Canada models) in the instrument
cluster flashes. By pressing the
!CHECK] button, you can bring up a
driver message which explains the malfunction in more detail.
Please note
~ page 32. .,.,

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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. 2 75 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 as
needed on the wheel that is on the inside of the curve or additionally
on the other wheels . An acoustic signal indicates when ESP brake
application cuts in
~ & .
The system operates across the entire speed range in combination
with the ABS system
~ page 292 . If the Anti-Lock Brake System
(ABS) malfunctions, the ESP will b e out of action as well.
Ac tiva tin g
When you turn on the engine, ESP will automatically be activated
and wil l perform a se lf-tes t. As soon as the test is comp leted, the
system is in norma l operating mode.
Offro ad m ode
ESP should normally be operated in normal mode because this
ensures maximum vehicle stabil ity . If necessary, you can activate
the ESP offroad mode by pressing the button
~ page 288, fig. 275
to obtain maxi mum traction and braking abil ity when dr iving off
paved roads at low speeds . In ESP offroad mode , the ESP indicator
l ight ~
page 19 illuminates and the message E S P Offroad appears
briefly in the display.
The ESP offroad mode can be usefu l in the fo llowing exceptional
s ituat ions when slip or a high ly effective differential locking func ­
tion is desirable. Examples:
• when driv ing with t ire chains,
• when driving in deep snow or on loose ground,
Inte llig ent tec hn olo gy
• when driving on uneven surfaces with the wheels severely
unloaded (articulation), and
• when rocking the vehicle loose after it has become stuck .
When the unusual situation is pas t, you should shift back to the
normal ESP operating mode by pushing the button again. The
message
ESP /A SR on then appears briefly in the display.
Hill d escent contr ol
The hil l descent control is swi tched on in ESP offroad mode . When
s lowly descending steep gradients on loose ground or when the
ax les are a rticulated, h ill descent control provides assistance by
automatically applying the brakes to keep vehicle speed constant.
The vehicle is also rendered easier to steer by se lective distribution
of braking force . Hi ll descent control intervenes when:
• the accelerator pedal is not pressed,
• the veh ic le is trave lling less than 12 mph (20 km/hl,
• a steep gradient is detected,
• whee l behavior indicates loose ground or conditions with poor
adhesion (e .g . also axle articulation).
Hi ll descent control operates both driving forward and in reverse.
Active hill descent contro l is deactivated by pressing the accelerator
pedal until the conditions for activat ion a lready listed are met again .
& WARNING
• The Elect roni c Sta bil izati on Progr am is ne ve rt hele ss subject to
th e law s of phy sics. It is particul arly important to pay attention to
t hi s fa ct on we t and slippery ro ads . It i s therefore i mpo rtant th at
yo u a lw ays adapt your dri vin g to the condition of the ro ad and
traffi c conditions . Do n ot allo w the in cre ased sa fety provided by
the Elect roni c Stabili zation Progr am system to lull you into
ac cepting additional safety r isks.
• Please be aw are th at in ESP offroad mo de, parti cularl y on a
s m ooth and slippery road , the wheel s m ay have an incr eased •
I t •

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& WARNING (continued)
tendency to spin and the vehicle may break away -danger of skid­
ding!
• Stability is limited in the ESP offroad mode. •
Electronic differential lock (EDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
General notes
The electronic differential lock (EDU helps the car to start moving,
accelerate and climb a gradient on surfaces providing poor or
almost no grip . Without EDL, this would be difficult, if not impos­
sible.
How the system works
The EDL operates automatically. It monitors the rotational speed of
wheels with the help of the ABS sensors=> page 292. If a noticeable
slip is detected at the wheels (e.g. on slippery ground on one side),
the spinning wheels 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 signal that wheel spin is being
controlled.
Driving 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
with less grip, apply plenty of throttle 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 22. •
Anti-Slip Regulat ion 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 292, ASR monitors the
speed of the driven wheels. If the wheels start to spin, 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 . ..,

lffl) __ A_l.:,. p _h_ a_ b_e _t _ic _ a_l _in _ d_e _x ____________________________________________ _
Data ........ .... .... ....... .... ... 399
Data recorder . ...... .... .... ...... . 288
Date display . . . . . . . . . . . . . . . . . . . . . . . . 14
Daytime running lights ... .... .... . 73, 74
Declaration of compliance
Adaptive Cruise Control ... .... ....
404
Audi side assist . . . . . . . . . . . . . . . . . . 404
Cell phone package . . . . . . . . . . . . . . 404
Convenience key . ...... ...... .... 404
Electronic immobilizer ..... .... ... 404
HomeLink® universal remote control 404
Remote control key . . . . . . . . . . . . . . . 404
Tire pressure monitoring system ... 404
def
What does this mean when it appears in the trip odometer display? ........
15
Defective light bulb warning ........... 27
Defrosting/defogging the windows ... .
127
Defrosting/defogging windows ....... 130
Determining correct load limit ........ 356
Digitalclock ..... .................... 14
Digital compass . .... .... .... ........ 89
Digital speedometer ...... ............ 27
Dimensions .. .... .... .... .... .... .. 398
Dipstick
Reading the dipstick properly
335
Distance control system
See Adaptive Cruise Control . . . . . . . 152
Doors
Power child safety lock . . . . . . . . . . . . .
61
Driver information system ... ... .. .... . 25
Digital speedometer . . . . . . . . . . . . . . .
27
Driver information messages ....... 30
Open door or rear lid warning ....... 27
Outside temperatur ,e display ........ 26
Sound system disp lay .... ... .. .... 26
Driver seat
See Seating position ......... .... . 222
Driver's seat . . . . . . . . . . . . . . . . . . . . . . . . . 93
Driver's seat memory . . . . . . . . . . . . . . . . . 97
Activating remote control key ....... 98
Recalling a sea t position ....... ... . 97
Storing a seat positiion ... .... .... .. 97
Driving messages .................... 30
Driving mode
See Adaptive Air Suspension .. ..... 208
Driving offroad
Driving through water ... .... ... ..
303
Driving tips ... ....... ...... ... ... 302
Rules of behavior ... .. .... .... ... 302
Sand and mud ................ ... 303
Snow -covered grou nd ............ 303
Unpaved roads .................. 303
Driving safely .... .... ...... ... .. ... 220
Driving through water .... .... ....... 303
Driving time ....... ....... .... ... .... 40
Dup licate key .... .... ... .... ........ . 48
Dust filter
Climate controls .. ........ .......
123
E
Easy entry feature . . . . . . . . . . . . . . . . . . . 142
ECON mode
Climate controls ... .... ... .... ...
126
Electric seat adjustment
See Power seat . . . . . . . . . . . . . . . . . . . . 93
Electronic differential lock (EDU
How the system works . . . . . . . . . . . .
290
Warning/indicator lights ... .. ...... . 22
Electronic immobilizer .... ........ .
15, 51
Electronic power control
(EPC) warning/indicator light ........
19
Electronic speed limiter .... ........... 29
Electronic stabilization program (ESP) Hill descent control . .... ...... ....
288
How the system works . . . . . . . . . . . . 288
Offroad mode . . . . . . . . . . . . . . . . . . . . 288
Warning/indicator lights ............ 19
Emergency flasher ................... 76
Warning/indicator lights ........... . 20
Emergency locking of doors . ...... .... 57
Emergency operation
Panoramic s liding sunroof ....
70, 71, 72
Rear lid ..... ...... .... ........... 60
Emergency starting ................. 387
Emergency towing ... .... .... .... ... 390
Energy management . .... ........... 295
Battery power . . . . . . . . . . . . . . . . . . .
296
Driver notification . . . . . . . . . . . . . . . . 296
Engine Compartment ....................
332
Coolant ...... ...... ...... .... ... 337
Hood ... ...... .... ....... .... ... 330
Starting ............... ...... 142, 143