
Table of contents
Owner's Literature
About this Owner's Manual ... .. .
Cockpi t ... ...... ........... .. .. .. .
Cockpi t overview .......... .. .. .. .
Controls at a g lance . ..... ... .. .. .. .. .
Instrument s and indicator lights
Instruments .. .. ........... .. .. .. .. .
I ndicator ligh ts .... ..... ... .. .. .. .. .
On-Board Diagnostic system (OBD) ..... .
Driver inform ation system ..... .
Overview ..... .. ... .. ..... ... .. .. .. .
Operation . ..... .. . .. ..... ... .. .. .. .
Boost indicator .... ........... .. .. .. .
Efficiency program ............ .. .. .. .
Lap t imer a nd engine oil temperature
i n dicator . .. .... .......... ...... ... .
Start and drive .............. .. .. .
Opening and clo sing ...... .. .. .. .
Centra l locking .. .............. ... .. .
L uggage compa rtment lid .. .. .. .. .. .. .
Ch ild safety loc k ... ......... .. .. .. .. .
P ower windows . ............. .. .. .. .
P anorama s unroof .. ..... ... .. .. .. .. .
5
6
8
8
8
10
10
13
25
27
27
28
29
29
30
33
33
33
39
4 0
40
42
Light and Vi sion . . . . . . . . . . . . . . . . . . 43
Exterior lighting . . . . . . . . . . . . . . . . . . . . . 4 3
Interior lighting . . . . . . . . . . . . . . . . . . . . . 46
V1s1on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7
W indshield wipers . . . . . . . . . . . . . . . . . . . 49
Dig ita l compass . . . . . . . . . . . . . . . . . . . . .
51
Seats and storage ....... .. .. ... . .
General information .......... .. .. .. .
53
53
Front seats . . . . . . . . . . . . . . . . . . . . . . . . . 54
H ead rest raints . . . . . . . . . . . . . . . . . . . . . 56
Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
S to rag e . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
L uggage compa rtmen t . . . . . . . . . . . . . . . 59
Roof rac k . . . . . . . . . . . . . . . . . . . . . . . . . .
6 2
Warm and cold . . . . . . . . . . . . . . . . . . . 64
Climate con trol sy stem . . . . . . . . . . . . . . . 6 4
2
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
General information . . . . . . . . . . . . . . . . . 70
Econom ica l and envi ronmentally-friendly
driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Starting and stopp ing the engine
(ve hicles w ith an ign ition lock) . . . . . . . . . 73
Start ing and stopp ing the engine
(ve hicl es w ith a convenience key) . . . . . . . 75
Drive r messages . . . . . . . . . . . . . . . . . . . . . 7 7
E lectromechanica l pa rking brake . . . . . . . 78
Hill ho ld . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Automatic tran smission . . . . . . . . . 82
S troni c . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2
Trailer mode . . . . . . . . . . . . . . . . . . . . . . 91
Driving with a trailer . . . . . . . . . . . . . . . . . 91
Trai ler mode notes . . . . . . . . . . . . . . . . . . . 92
Driver assi stance . . . . . . . . . . . . . . . . . 9 4
Assi st .. .. .. .... .. .. ... .. ..... ... .. 94
E lectronic speed limiter* . . . . . . . . . . . . . . 94
Speed warning system . . . . . . . . . . . . . . . . 94
Cruise contro l system . . . . . . . . . . . . . . . . 94
Audi adaptive cruise control . . . . . . . . . . .
96
Audi pre sense . . . . . . . . . . . . . . . . . . . . . . 103
General informa tion . . . . . . . . . . . . . . . . . 103
Audi pr e sense bas ic . . . . . . . . . . . . . . . . . . 103
Audi pre se nse front. . . . . . . . . . . . . . . . . . 10 4
Driver messages . . . . . . . . . . . . . . . . . . . . . 106
Audi active lane assist . . . . . . . . . . . . . . . . 106
Audi s ide ass ist . . . . . . . . . . . . . . . . . . . . . 109
A udi drive select (d rive settings) . . . . . . . . 112
Parking systems
General information
Rear par king system
115
115
116
Parking system pl us. .. ........... .. .. 116
Rearv iew camera . . . . . . . . . . . . . . . . . . . . 117

M N
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CD
@
®
©
®
®
(J)
®
Power windows
Door hand le
Aud i side assist
........ .... .. .
Centra l locking switch ... .. .. .. .
Powe r exter ior mir ro r adjustment
H ead light cont rol swit ch .. .. .. .
Vents
L ever fo r:
- Turn si gnals and high beams . . .
- Audi act ive lane assis t ... .. .. .
® Steer ing whee l w ith horn and
@
©
@
- Driver's airbag ....... .. .. .. .
- On-board computer controls .. .
- MMI, telephone , nav igat ion and
vo ice recogn ition system controls
- tiptron ic shift paddles (automatic
transmission)
I ns trumen t clus te r ..... .. .. .. .
W indshield washer system lever .
Steer ing column with:
- Ignit ion emergency operation (in
vehicles with conve nience key) .
- Ignit ion loc k (in vehicles wi th me-
chanical key) . ..... ... .. .. .. .
@ Adjustable steer ing column
(B) D epending on equipment: 4
0
109
37
47
4 3
64
45
106
152 28
87
1 0
49
7 7
73
72
- Cruise contro l lever . . . . . . . . . . 94
- adaptive cruise cont ro l . .. .. .. .
Driver's knee a irbag .... .. .. .. .
I ns trumen t illum ination . .. .. .. .
Hood re lease
. .. .... ... .. .. .. .
Luggage compartment release ..
C hild safety loc k bu tton . .. .. .. .
MMI disp lay (navigation, radio, TV/
video)
Glove compartment ( lockable) .. .
F ront passenger's airbag . ... .. .
Treble speakers Fr ont passenger's knee airbag .. .
Depending on equipment, b uttons
f or:
- Audi dr ive select ...... .. .. .. .
- Pa rking aid plus (o r with rearview
camera) 9
6
164
4 7
199
39
40
58
152
164
1 12
1 16
Co ckpit over view
-Eme rgency flashers ..... ... . .
- Elect ron ic St abiliza tion Control
( E SC) ..... .. .. .... .... ... . .
- MMI Displ ay
- Airbag Off indicato r ..... .... .
@ Depending on eq uipment:
- Manual climate contro l system .
- Automatic climate control
system ... .. ............. . .
@ Socket . .... .. .. ........... . .
S tronic se lector lever
. .... ... ..
Cup ho lde r .. .. .......... .... .
MM I On/ Off button
MMI control panel
Parking bra ke
@) I S TAR T ENGI NE STOPI button
(vehicles with convenie nce key)
(J} Tips
- Some the eq uipment listed here is only in
sta lled in certa in models or is available as
an option . 44
123
160
6S
66
5 7
82
58
78
75
- Ope rat ion of the Multi Med ia In terface
(MMI) is described in a separate o perating
instructions manual. You can a lso find infor
mation on A udi connect there.
9

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@ Tips
Diesel engines: Due to the high efficiency of
these engines, the engine may not a lways
reach operating temperature in cold outside
temperatures. This is normal and not a cause
for concern.
Indicator lights
Description
Fig. 6 Instrument cl uster : example of a d isplay in vehicles
wit h a mo noc hro me display
@ Indicator light
® Message
© Status line:
-• ID Central indicator light or addition
al d isplays for active systems such as
- - (USA models)
I. (Canada models)
electromechanical parking brake
- [ij;(i)~14 (USA models) / Iii (Canada models)
cruise control system*
- • I. Active lane assist*
The indicator lights in the instrument cluster
blink or turn on. They indicate functions or mal
functions.
The
central indicator light@ • or a also
turns on with some indicator lights@.
I f the centra l indicator light @turns on, check
the additiona l information in the instrument
cluster display @ and @.
In addition to the indicator lights in the display,
there are add it ional ind icators in the tachometer .
They blink or turn on to ind icate functions or mal
functions. Messages @ may also appear briefly
Instruments and indicator lights
with some indicato r lights. A warning tone a lso
sounds at the same time.
If t here are mult iple malfunctions, the indicator
lights will appear br iefly one after another in the
display.
T he ind icators and messages in the display can be
covered over by other displays . In cases where
the indicator light @is covered over, the centra l
indicator light@will remain visible until the
malfunction is repaired .
T he messages can be displayed again in the driv
er information system
~ page 28, Operation.
Overview
Some indicator lights turn on briefly to check the
function of that system when you switch the igni
tion on . These systems are marked with a./ in
the following tables. If one of these indicator lights does not turn on, there is a malfunction in
that system .
Your vehicle has either a monochrome display or a multicolored display, depending on vehicle
equipment . In a monochrome display, the indica
tor lights @ only appear in white
Q page 13,
fig . 6. The central indicator light ©. / D also
appea rs to indicate the prio rity of these indicator
lights. Refer to the explanations for red or yellow
indicator lights.
Examples of indicator lights in a monochrome
display:
11 @ Priority 1 (high priority)
. © Refer to
red indicator lights
m@ Pr iority 2 (medium priority)
II ©
Refer to yellow indicator lights
D@ Pr iority 3 (low priority)
These are i nformative indicator
-- © lights
13

Instruments and indicator lights
Drive to your authorized Audi dea le r or a uthor
ized Audi Service Facility immediate ly to have the
malfunct ion corrected
¢ .&. .
1111 (USA m od els) /. (C an ada mod els) Park
ing brake sy stem f ault! See owner' s manual
- If the indicato r light and the message appear
wh en th e vehi cle is stationar y or aft er swit ch
ing the ignit ion on ,
check if you can release the
parking b rake . If you cannot re lease the parking
brake, see your authorized A udi dealer or au
thorized Audi Service Facility. If you can re lease
the parking brake and the message st ill ap
pears, see an authori zed Audi dealer or author
ized Audi Serv ice Facility immediately to have
the malfunct ion corrected .
- If the indica tor light and message appear
whil e
driving ,
the hill start assist or emergency brak
i ng function may be malfunct ion ing . It may not
be possib le to set the pa rking brake o r release
i t once it has been set. Do not pa rk your ve hicle
o n hill s and see an authorized Audi dea ler or
authorized Audi Service Fac ility for assistance .
If the
1111 and El warning lights turn on to
gethe r, take you r veh icle to a n author ized Audi
dealer o r autho rized Aud i Service Faci lity immedi
ately to have the b rake pads inspected
¢ page 21 .
There is a lso a war ning tone when the lights t urn
on .
_& WARNING
- Read and fo llow ing the warn ings in
¢ page 198, Working in the engine com
partment
before opening the hood and
check ing the brake fluid level.
- If the brake system indicator light does not
turn off or it turns on wh ile driving, the
brake flu id leve l in the reservo ir is too low,
and this increases the r isk of an accident.
Stop the vehicle and do not continue dr iv
ing . See an author ized Audi dealer or au
tho rized Aud i Service Fac ility for assistance.
- If the brake system indicator light tu rns on
together with the ABS and ESC ind icator
lights, the ABS/ ESC regu lating fu nction may
be malfunctioning. Functions th at stabilize
18
the vehicle are no longer ava ilable . This
could cause the rear of the vehicle to
swerve, which increases the r isk that the ve
hicle will slide. Drive carefully to the nearest
author ized Audi dealer or authorized Audi
Service Fac ility and have the malfunction
corrected.
PARK/(®)/ ~ Electromechanical parking
brake
If the -(U SA mode ls) /. (Canada mode ls)
indicato r light turns on, t he parking brake was
set.
- (USA model s) / . (Canad a model s) Cau
tion: Vehicle parked too steep
If the indicato r ligh t blink s and the message ap
pe ars, there is no t eno ugh braking powe r to se
cu re the vehicle. The brakes have overheated. The
vehicle could ro ll away even on a sma ll incline.
- (USA mod els ) /. (Canada model s)
Plea se pr ess brak e pedal t o rel ease parking
br ake
To re lease the park ing brake, press the brake ped
al and p ress the~ button at the same time, o r
star t driving with hill start assist
¢page 80,
Starting from a stop.
Ill Parking brak e!
There is a malfunc tion in the parking brake. Drive
to an authorized Aud i dea ler or authorized Audi
Service Facility immed iately to have the malfunc
tion co rrected .
Ill Parking brake: limited functionality !
There is a malfunction in the parking brake. Drive
to an authorized Audi dea ler or a uthori zed Audi
Service Facility immed iate ly to have the ma lfunc
tion correc ted.
!~;1 ;1J: );J;13~ ( USA models ) / ¢@'A
Release the par king brake if this message ap
pears.
lt1 ;1J :);tJ :H ( USA m odels ) / iiJ (Canada models)
Parking brake aut o release unavailable
...
![AUDI S3 SEDAN 2015 Owners Manual M N
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1.11
1.11
,....,
If th is message appea rs, press t he b rake pe da l
f ir st and the n re lease the par king brake .
IZ,;11:);MJ~ (USA models) / [i] (Canada AUDI S3 SEDAN 2015 Owners Manual M N
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1.11
1.11
,....,
If th is message appea rs, press t he b rake pe da l
f ir st and the n re lease the par king brake .
IZ,;11:);MJ~ (USA models) / [i] (Canada](/manual-img/6/57653/w960_57653-20.png)
M N
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1.1'1
1.1'1
,....,
If th is message appea rs, press t he b rake pe da l
f ir st and the n re lease the par king brake .
IZ,;11:);MJ~ (USA models) / [i] (Canada models)
Caution: Vehicle parked too steep
I f the indicator lig ht blinks and t he messag e ap
pea rs, there is no t enoug h bra kin g power to se
cure the vehicle. The b rakes have ove rhe ate d. T he
ve hicl e c ould r oll aw ay even on a sm all incli ne.
l:(;1;1:t:);MJ~ (USA models ) / [i] (Canada models)
Parking brake is applied
I f th is message appears , press t he brake pedal
f ir st and the n re lease the par king b rake if neces
sa ry .
(D Tips
For addit io nal information o n the park ing
b ra ke, re fe r to ¢
page 78.
_L Cooling system
• Switch off engine and check coolant level!
The coolant leve l is too low or the coolant tem
pe ra tu re is too hig h.
Do not cont inue driving and switc h the engine
off. C hec k the coolant leve l¢
page 205.
- If the coolant leve l is too low, add coolant
¢ page 206 . Only cont inue driv ing once t he in
dicator light turns off.
- If the coolant is at the correct level , the prob
l em may be ca used by a ma lf u nction in the radi
ator fan. Do not cont inue driv ing. See an au
t h orized Aud i dea le r or authorized Audi Service
Fac ility for assistance .
• Coolant temperature too high! Let engine
run with vehicle stationary
L e t th e en gine cool by r unnin g it in idle for a few
minutes .
A WARNING
-Never open t he hoo d if you ca n see o r hear
steam o r co olant escap ing from the engine
compartment. T his i ncreases the ris k of
bur ns. Wai t until yo u no lo nger see o r hear
steam o r co olan t escap ing .
Instruments and indicator lights
-The engine compa rtment in any vehicle ca n
be a dange ro us area . Sto p the engine and a l
low it t o cool befo re working in the engine
compa rtment. Always follow the informa
tion fo u nd in ¢
page 198, Working in the
e ngine compartment .
(D Note
Do not cont inue dr iv ing if the . indicato r
li g ht tur ns on -this inc reases the r isk o f en
g in e damage.
"1::::7: Engine oil pressure
• Switch off engine! Oil pres sure too low
St op t he engine and do not cont inue drivi ng .
Ch eck the eng ine oi l level
¢ page 203.
- If the engine o il level is too low, add eng ine oi l
¢ page 201 . Only continue dr iving once the in
dicator light turns off.
- If the engine o il level is co rrect and the indica
to r li ght still turns on, turn t he e ngine off and
do not cont inue drivi ng. See an authorized Aud i
dea le r or a uth o rized Aud i Serv ice Facility fo r as
sis tance .
(D Tips
The oil pressu re war ning is not an oi l level i n
dicator . Always chec k the o il l ev el re gular ly .
0 Alternator/battery
• Alternator fault : battery is not being charg
ed
T he re is a malfunction in the al ternator or the ve
hicle e lectr ica l system .
Drive to an authorized A udi dealer or autho rized
Audi Serv ice Facility immed iately. Because t he ve
hicle battery is d ra ining, turn off all unnecessary
elect rical e quipment suc h as th e MMI. Seek pro
fe ssional ass istance if t he battery charge lev el is
too low.
(•) Low battery charge: Battery will be charged
while driving
The starting ab ility may be impaired.
19

M N
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1.1'1
1.1'1
,....,
brake provides various convenience and safety
functions.
When starting from rest
- The integral hill start assist helps you when
driving by automatically releasing the parking
brake ¢
page 80 , Starting from a stop.
- When starting on inclines, the hill start assist
prevents the vehicle from unintentionally roll
ing back. The braking force of the parking brake
is not r eleased until sufficient driving forc e has
b ee n built up at the wh eels.
Emergency brake function
An emergency braking functions ensures that the
vehicle can be slowed down even if the
normal
brakes fail¢ page 80, Emergency braking func
tion.
A WARNING
- Do not press the accelerator pedal inadver
tently if the vehicle is stationary but the en gine is running and a gear is selected . Other
wise the vehicle will start to move immedi
ately and could result in a crash.
-If the power supply fails, the released park
ing brake can no longer engage. In this case,
park the vehicle on level ground and secure
it by placing the selector lever in the P posi
tion. See an authorized Audi dealer or au
thorized Audi Service Facility for assistance.
(D Note
If the . or 1111 (USA models)/ . (Canada
models) indicator light in the instrument clus
ter blinks , there is a malfunction in the brake
system. Refer to the detailed description of
the indicator lights¢
page 17.
-If the - (USA models)/ . (Cana-
da models) or
Ill indicator light turns on,
there is a malfunction in the parking brake
¢ page 18.
(D Tips
-If the parking brake is set while the ignition
is switched
off, thP l<@) indicator light in the
button and in the instrument cluster dis
play - (USA models) /. (Canada mod-
Driving
els) will turn off after a certain amount of
time.
- If driver's door is opened while the ignition
is switched on, the parking brake sets auto
matically. This prevents unintended rolling
of the vehicle.
- Occasional noises when the parking brake is
applied and released are normal and are not
a cause for concern.
- When the vehicle is parked, the parking
brake goes through a self-test cycle at regu
lar intervals. Any noises associated with this
are normal.
- If there is a power failure, the parking brake will not set if it is released, and it will not
release if it is set¢&. See an authorized
Audi dealer or authorized Audi Service Fa
cility for assistance .
Parking
.. Press the brake pedal to stop the vehicle.
.. Pull the switch@¢
page 78, fig . 71 to set the
parking brake.
.. Place the selector lever in the P position.
.. Turn th e engine off¢,& .
.. Turn the steering wheel when pa rking on in
clines so that the wheels will roll into the curb
if the vehicle starts moving .
A WARNING
--Always take the vehicle key with you when
leaving the vehicle, even for a short period
of time. This applies particularly when chil
dren remain in the vehicle. Otherwise the
children could start the engine , release the
parking brake or operate electrical equip
ment (e.g. power windows). There is the risk
of an accident.
- When the vehicle is locked, no one -particu
larly not children should remain in the vehi
cle. Locked doors make it more difficult for
emergency workers to get into the vehicle,
which puts lives at risk.
79

Driving
Starting from a stop
The start assist function ensures that the park
ing brake is released automatically upon start
ing.
Stopp ing and appl ying parking br ake
.,. Pu ll the switch @q page 78, fig. 71 to set the
parking brake.
Starting and aut omatically rel ea sing the
pa rking br ake
Requirement: The driver 's door must be closed.
.,. When you press the accelerato r pedal, the park
ing brake is automatically released and your ve
hicle begins to move.
When stopp ing at a traffic signa l o r stopp ing in
city traffic, the parking brake can be applied . The
vehicle does not have to be held with the brake
pedal. The parking brake e liminates the tendency
to creep when a selector lever position is engag
ed. As soon as you press the accelerator pedal,
the park ing brake releases automatically and the
veh icle starts to move.
St arting on slope s
When starting on inclines, the h ill start ass ist
prevents the vehicle from unintentionally rolling
back . The braking force of the parking brake is
not released unt il sufficient d riving force has
been b uilt up at the whee ls .
(0 Tips
For safety reasons, the park ing brake only re
leases automat ica lly when the driver's door is
closed .
Emergency braking function
In the event that the conventional brake system
fails or locks .
.,. To brake your vehicle in an emergency, pull the
@ switch
q page 78, fig. 71 and hold it pulled.
.,. As soon as you release the @switch or acceler
ate, the braking process stops.
Pulling and holding the@switch while driving at
a speed of about 2 mph (3 km/h) or h igher in i-
80
tiates the emergency b rak ing function . The veh i
cle is braked at all four whee ls by activating the
hydraulic brake system . The brake performance is
s imilar to heavy brak ing.
q &
To he lp prevent activating the emergency braking
by mistake, an audib le wa rning tone (buzzer)
sounds when the @switch is pu lled . Emergency
braking stops as soon as the @switch is released
or the accelerator pedal is pressed.
A WARNING
Emergency braking should only be used in an
emergency, when the norma l brake pedal has
failed or the bra ke pedal is obstructed. During
emergen cy bra king, your ve hicl e will bra ke
similar to he avy braking. ESC and the asso ci
ated components (ABS, ASR, EDL) canno t
overcome the laws of physics. In corners and
when road o r weathe r cond itions are bad, a
fu ll brake applicat ion can cause the veh icle to
skid or the rear end to break away, which in
creases the risk of an accident.
Hill hold
App lies to vehicles: wit h Hill Hold
Hill hold makes it easier to start on hills.
Req uirement: The driver door must be closed and
the engine must be running.
The system is activa ted when the brake peda l is
pressed whi le the vehicle is statio nary .
To prevent the vehicle from roll ing ba ck when
st art ing, the brake power is held fo r a b rief mo
ment afte r releas ing the b rake pedal. During this
time, you can easily begin to move your vehicle.
A WARNING
-The inte lligent technology of Hill Hold can
not overcome the limitations imposed by
natura l physical laws. The increased comfort
offered by Hill Hold shou ld not cause you to
take safety r isks.
- Hill Hold cannot hold the vehicle in all hill
start sit uat ions (for example, if the ground
is s lippery or icy).

Automatic transmission
-If the engine must run while you are work
ing in the engine compartment with the
hood open, make sure a gear is not engag
ed . The selector lever must be firmly in the
P position and locked in place and the park
ing brake must be set ¢
page 198. Other
wise, the vehicle could begin moving when
the engine speed is high, even with the
parking brake set.
0 Note
- When stopping on an incline, do not try to
hold the vehicle in place by pressing the ac
celerator pedal while a driving gear is se
lected. This can cause the automatic trans
mission to overheat and can damage it. Ac
tivate the parking brake or press the brake
pedal to prevent the vehicle from rolling.
- Allowing the vehicle to roll when the engine
is stopped and the selector lever is in the N
position will damage the automatic trans
mission because it is not lubricated under
those circumstances.
- The transmission can overheat and be dam
aged under certain driving and traffic condi
tions such as frequent starts, creeping for a
long time, or stop-and-go traffic . When the
5] or. indicator light turns on, stop the
vehicle at the next opportunity and let the
transmission cool¢
page 88.
-Allowing the vehicle to roll when the engine
is stopped will damage the S tronic trans
mission because it is not lubricated
¢ page 2 54, Towing with a tow truck.
(D Tips
For safety reasons, the parking brake only re
leases automatically when the driver's door is
closed.
Hill descent control
Applies to veh icles: w ith S tron ic transm ission
The hill descent control system assists the driv
ing when driving down declines.
Hill descent control is activated when the selec
tor lever is in the Dor S position and you press
86
the brake pedal. The transmission automatically
selects a gear that is suitable for the incline. Hill
descent control tries to maintain the speed ach
ieved at the time of braking, within physical and
technical limitations. If may still be necessary to
adjust the speed with the brakes. Because hill de
scent control cannot shift down farther than 3rd
gear, it may be necessary to shift into tiptronic
mode in very steep areas . In this case, shift into
1st or 2nd gear in tiptronic mode to use the en
gine's braking force to relieve the brakes.
Hill descent control switches off once the decline
levels out or you press the accelerator pedal.
On vehicles with a cruise control system*
¢
page 94, hill descent control is also activated
when the speed is set .
&_ WARNING
Hill descent control cannot overcome physical
limitations, so it may not be able to maintain
a constant speed under all conditions. Always
be ready to apply the brakes.