brake Seat Leon SC 2017 Workshop Manual

Operation
WARNING
Use of the cruise control could cause acci-
dents and sev
ere injuries if it is not possible
to drive at a constant speed maintaining the
safety distance.
● Do not use the cruise control in heavy traf-
fic, if the dis
tance from the vehicle in front is
insufficient, on steep roads, with several
bends or in slippery circumstances (snow,
ice, rain or loose gravel), or on flooded roads.
● Never use the CCS when driving off-road or
on unpav
ed roads.
● Always adapt your speed and the distance
to the v
ehicles ahead in line with visibility,
weather conditions, the condition of the road
and the traffic situation.
● To avoid unexpected operation of the cruise
contro
l system, turn it off every time you fin-
ish using it.
● It is dangerous to use a set speed which is
too high for the pr
evailing road, traffic or
weather conditions.
● When travelling down hills, the CCS cannot
maintain a c
onstant speed. The vehicle tends
to accelerate under its own weight. Select a
lower gear or use the foot brake to slow the
vehicle. WARNING
Observe the safety warnings ›››
in Warning
and contr o
l lamps on page 119. Operating the cruise control system*
Read the additional information carefully
›› ›

 page 45
The value indicated in the table in brackets
(in mph, miles per hour) only refers to instru-
ment panels with indications in miles.
Changing gear in CCS mode
The CCS decelerates as soon as the clutch
pedal is pressed, intervening again automati-
cally after a gear is engaged.
Travelling down hills with the CCS
When travelling down hills the CCS cannot
maintain a constant speed. Slow the vehicle
down using the brake pedal and reduce
gears if required.
Automatic off
The cruise control system (CCS) is switched
off automatically or temporarily:
● If the system detects a fault that could af-
fect the w

orking order of the CCS.
● If you press and maintain the accelerator
pedal f
or a certain time, driving faster than
the stored speed.
● If the dynamic driving control systems in-
terv
ene (e.g. ASR or ESC).
● If the airbag is triggered. Emergency brake assist system
(Front As

sist)*
Topic introduction Fig. 204
On the instrument panel display:
pr e-w
arnin

g messages. The objective of the emergency brake assist
sy
s
t

em is to prevent head-on collisions
against objects that may be in the vehicle’s
path or minimise the consequences of such
impacts.
Within the limitations imposed by the envi-
ronmental conditions and by the system it-
self, the function acts in staggered fashion,
depending on how critical the situation is. In-
itially it warns the driver, and if the driver’s
reaction does not occur or is insufficient, it
activates an independent emergency brak-
ing.
210

Driver assistance systems
The function is intended to prevent collisions
w ith p
ark
ed vehicles or vehicles in the same
lane travelling in the same direction, or with
pedestrians crossing the vehicle’s path. It
may fail to activate in other danger situa-
tions.
The Front Assist function is active within a
range of speeds between 4 km/h (2.5 mph)
and 250 km/h (156 mph). Depending on
speed, traffic conditions and driver behav-
iour, some of the sub-functions described be-
low are omitted in order to optimise the sys-
tem’s general behaviour.
The Front Assist is a driving assistance func-
tion that can never replace the driver’s atten-
tion.
Safety distance warning
If the system detects a situation of danger
because the vehicle is too close to the vehi-
cle ahead, it will warn the driver by means of
an indication on the instrument panel display
.
The timing of the warning varies depending
on driver behaviour and the traffic situation.
Advance warning
If the system detects a possible collision with
the vehicle in front, it may alert the driver by
means of an audible warning and an indica-
tion on the instrument panel display
››› Fig. 204. The warning moment varies depending on
the traffic s
ituation and driver behaviour. At
the same time, the vehicle will prepare for a
possible emergency braking ››› .
C ritic
a

l warning
If the driver fails to react to the pre-warning
(advance warning), the system may actively
intervene in the brakes and generate a brief
jolt to warn the driver of the imminent danger
of a collision.
Automatic braking
If the driver also fails to react to the critical
warning, the system may initiate independ-
ent emergency braking by progressively in-
creasing the braking effect in accordance
with how critical the situation is.
Driver emergency brake assist system
Faced with an imminent collision, the system
may detect that the driver is not braking hard
enough to avoid the collision. In this case, it
will automatically increase the braking effect.
Due to certain driving circumstances and the
limitations of its operation, there are some
cases in which the system cannot prevent a
collision, although it can significantly mini-
mise the consequences by reducing the
speed and the force of the impact. WARNING
Observe the safety warnings ›››
in Warning
and contr o
l lamps on page 119. WARNING
The Front Assist system cannot change the
la w

s of physics or replace the driver in terms
of keeping control of the vehicle and reacting
to a possible emergency situation. WARNING
Following a Front Assist emergency warning,
pa y

immediate attention to the situation and
try to avoid the collision by braking or by
dodging the obstacle, as applicable.
● If the Front Assist does not work as descri-
bed in this c
hapter (e.g. it repeatedly inter-
venes unnecessarily), switch it off.
● Adapt your speed and safe distance to the
vehicl
e in front of you at all times to suit visi-
bility, weather, road and traffic conditions.
● The Front Assist alone cannot avoid acci-
dents and seriou
s injuries.
● In complex driving situations, occasionally
the Front As
sist may issue warnings and in-
tervene in braking unnecessarily, for example
at traffic islands.
● If the operation of the Front Assist is im-
paired, f
or example, by dirt or because the ra-
dar sensor has lost its settings, the system
may issue unnecessary warnings and inter-
vene inopportunely in the braking. » 211
Technical data
Advice
Operation
Emergencies
Safety

Operation
●
The Front As
sist does not react to animals
or vehicles crossing your path or approaching
head-on down the same lane.
● The Front Assist does not react to pedes-
trians
walking in the same direction or ap-
proaching head-on down the same lane.
● The driver must always be ready to take
over the c
ontrol of the vehicle.
● When the Front Assist causes a braking,
the brake ped
al is “harder”.
● Automatic interventions by the Front Assist
on the brake
s may be interrupted by pressing
the clutch, accelerator or moving the wheel. Note
● When the Front As

sist is connected, the in-
dications on the instrument panel screen may
be concealed by warnings from other func-
tions, such as an incoming call.
● When the Front Assist causes a braking,
the brake ped
al is “harder”.
● Automatic interventions by the Front Assist
on the brake
s may be interrupted by pressing
the clutch, accelerator or moving the wheel.
● The Front Assist may brake the vehicle until
it st
ops completely. However, the brake sys-
tem does not halt the vehicle permanently.
Use the foot brake!
● If the Front Assist does not work as descri-
bed in this c
hapter (e.g. in intervenes several
times unnecessarily), switch it off. Have the
system checked by a specialised workshop.
SEAT recommends visiting a SEAT dealership. Radar sensor
Fig. 205
On the front bumper: radar sensor. A radar sensor is installed on the front bump-
er t
o det
ermine the tr

affic situation
››› Fig. 205 1 .
The r a
d

ar sensor's visibility may be impaired
by dirt, mud or snow, or by environmental in-
fluences such as rain or mist. In this case, the
Front Assist does not work. The instrument
panel displays the following message:
Front Assist: No sensor vision! If
necessary clean the radar sensor ››› .
When the r a
d

ar sensor begins to operate
properly again, the Front Assist will automati-
cally be available again. The message will
disappear from the instrument panel display.
Front Assist operation may be affected by a
strong radar reverse reflection. This may oc-
cur, for example, in a closed car park or due to the presence of metallic objects (e.g. rails
on the roa

d or sheets used in road works).
The area in front of and around the radar sen-
sor should not be covered with adhesives,
additional or similar headlights, as this may
negatively affect Front Assist operation.
If the front of the vehicle is not properly re-
paired or structural modifications are made
to it, for example if the suspension is low-
ered, Front Assist operation may be affected.
SEAT recommends visiting a SEAT dealership
for this purpose. CAUTION
If you have the sensation that the radar sen-
sor is d

amaged or has lost its settings, dis-
connect the Front Assist. This will avoid pos-
sible dangerous situations caused by a sys-
tem malfunction. If this occurs have it adjus-
ted.
● The sensor may become damaged or lose
its settin
gs when knocked, for example, dur-
ing a parking manoeuvre. This may compro-
mise the system's efficacy or disconnect it.
● Repairs to the radar sensor require special-
ist
knowledge and special tools. SEAT recom-
mends visiting a SEAT dealership for this pur-
pose.
● A registration plate or plate holder on the
front th
at is larger than the space for the reg-
istration plate, or a registration plate that is
curved or warped can cause the radar to mal-
function. 212

Operation
● If the
v
ehicle is on a test bed.
● When the radar sensor is damaged.
● If the radar sensor takes a heavy knock, for
examp
le in a rear collision.
● If it intervenes several times unnecessarily.
● If the radar sensor is covered temporarily
with some kind of
accessory, such as an ad-
ditional headlight or the like.
● When the vehicle is to be loaded on a lorry,
ferry
or train.
System limitations The Front Assist has certain physical limita-
tion
s
inher

ent to the system. Thus, in certain
circumstances, some of the system's reac-
tions may be inopportune from the driver's
standpoint. So pay attention in order to inter-
vene if necessary.
The following conditions may cause the Front
Assist not to react or to do so too late:
● In the first few instants of driving after
switc
hing on the ignition, due to the system’s
initial auto-calibration.
● On taking tight bends or complex paths.
● Pressing the accelerator all the way down.
● If the Front Assist is switched off or dam-
aged. ●
If the ASR ha
s been disconnected or the
ESC activated in Sport mode manually
››› page 188.
● If the ESC is controlling.
● If several brake lights of the vehicle or elec-
trically
connected trailer are damaged.
● If the radar sensor is dirty or covered.
● If there are metal objects, e.g. rails on the
roa
d or sheets used in road works.
● If the vehicle is reversing.
● If the vehicle over-accelerates.
● In case of snow or heavy rain.
● In case of narrow vehicles, such as motor-
bike
s.
● Misaligned vehicles.
● Vehicles crossing the other's path.
● Vehicles approaching in the opposite direc-
tion.
● Special loads and accessories of other ve-
hicle
s that jut out over the sides, backwards
or over the top. Adaptive Cruise Control ACC*
Relat
ed video Fig. 207
Safety Introduction
Fig. 208
Detection area. The adaptive cruise control (ACC)
is
an e
xten-
sion of the normal cruise control system
(CCS) ››› .
The A C
C

function allows the driver to program
a cruise speed of between 30 and 210 km/h
214

Driver assistance systems
(18 and 150 mph) and to select the distance
r equir
ed w
ith regard to the vehicle in front.
The ACC will adapt the vehicle's cruise speed
at all times, maintaining a safe distance with
the vehicle in front based on its speed.
When driving behind another vehicle, the
ACC function reduces speed until it is the
same as that of the vehicle ahead and main-
tains the set distance between the vehicles.
If the vehicle ahead accelerates, the adaptive
cruise control also accelerates, going no
higher than the target speed programmed.
If the vehicle is equipped with automatic
gearbox, the ACC can brake the vehicle until
it stops completely if a vehicle in front of it
stops.
The distance programmed should be in-
creased when the road surface is wet.
Driver intervention prompt
During driving, the ACC is subject to certain
limitations inherent in the system. In other
words, in certain circumstances the driver will
have to adjust speed him or herself, as well
as the distance from other vehicles.
In this case, the instrument panel screen will
warn you to intervene by applying the brake
and a warning tone will be heard
››› page 216. WARNING
The intelligent technology in the ACC cannot
ov er

come the system's inherent limitations
or change the laws of physics. If used negli-
gently or involuntarily, it may cause serious
accidents and injuries. The system is not a re-
placement for driver awareness.
● Adapt your speed and safe distance to the
vehicl
e in front of you at all times to suit visi-
bility, weather, road and traffic conditions.
● Do not use the ACC when visibility is bad,
on steep r
oads, with several bends or in slip-
pery circumstances such as snow, ice, rain or
loose gravel, or on flooded roads.
● Never use the ACC when driving off-road or
on unpav
ed roads. The ACC has been de-
signed for use on paved roads only.
● The ACC does not react on approaching a
fixed o
bstacle, such as the tail of a traffic
jam, a damaged vehicle or a vehicle stopped
at the traffic lights.
● The ACC only reacts to people if a pedes-
trian monitorin
g system is available. In addi-
tion, the system does not react to animals or
vehicles crossing your path or approaching
head-on down the same lane.
● If the ACC does not reduce speed sufficient-
ly, brak
e the vehicle immediately by applying
the pedal.
● If you are driving using the spare wheel,
the ACC
system could automatically switch
off during the journey. Switch off the system
when starting off. ●
If the v

ehicle continues to move involuntar-
ily after a driver intervention prompt, brake
the vehicle by applying the pedal.
● If the dash panel displays a driv
er interven-
tion prompt, adjust the distance yourself.
● The driver should be ready to accelerate or
brake b
y him/herself at all times. CAUTION
If you have the sensation that the radar sen-
sor i s d

amaged, disconnect the ACC. This will
avoid possible damage. If this occurs have it
adjusted.
● Repairs to the radar sensor require special-
ist
knowledge and special tools. SEAT recom-
mends visiting a SEAT dealership for this pur-
pose. Note
● If the A C

C system does not work as descri-
bed in this chapter, do not use it until it has
been checked by a specialised workshop.
SEAT recommends visiting a SEAT dealership
for this purpose.
● Maximum speed with the ACC activated is
limited to 210 km/h (150 mph).
● When the A

CC is switched on, strange
noises
may be heard during automatic brak-
ing cause by the braking system. 215
Technical data
Advice
Operation
Emergencies
Safety

Operation
Indications on the display, warning
and c ontr
o
l lampsFig. 209
On the instrument panel display: (A)
A C
C

inactive (Standby). (B) ACC active. Status display
Indic
ation
s

on the display ››› Fig. 209:
Vehicle ahead detected. ACC is not active
and is not regulating your speed.
Distance from the vehicle ahead. ACC is
not active and is not regulating your dis-
tance.
1 2 Vehicle ahead detected. ACC is active and
i
s
r

egulating your speed.
Distance level 2 set by the driver.
ACC is active and is regulating your dis-
tance based on speed.
Warning and control lamps
››› in Warning and control lamps on
p ag
e 119

. 
The speed reduction by the ACC to
maintain the distance from the vehi-
cle in front is not sufficient.
Brake! apply the foot brake! Driver intervention prompt.

The ACC is not currently available.
a)
With the vehicle stationary, switch off the engine and
start it up again. Check the SEAT badge area on the front
››› Fig. 210 (in case it is dirty or icy or it has been hit). If
it is still unavailable, refer to a specialised workshop to
have the system inspected.
a) The symbol on the instrument panels with colour display is in
colour. 
The ACC is active.
No vehicle is detected in front. The programmed speed
remains constant.3
4
5 
If the symbol is white: the ACC is ac-
tive.
A vehicle in front has been detected. The ACC adjusts
speed and distance from the vehicle in front.

If the symbol is grey: ACC is inactive
(Standby)
The system is switched on, but is not adjusting.

It lights up green
The ACC is active.
Some warning and control lamps will light up
briefly
when the ignition i
s

switched on to
check certain functions. They will switch off
after a few seconds. WARNING
Observe the safety warnings ›››
in Warning
and contr o
l lamps on page 119. Note
When the ACC is connected, the indications
on the ins trument

panel screen may be con-
cealed by warnings from other functions,
such as an incoming call. 216

Driver assistance systems
When the ACC function is active, the vehicle
tr av
el
s at a set speed and distance from the
vehicle ahead. Both speed and distance can
be changed at any time.
Disconnecting and deactivating the ACC
To disconnect the ACC move the lever to the 0 position
›››
Fig. 211
(en
gaged). An ACC
deactivated message appears and the
function is totally deactivated.
If you do not wish to disconnect the ACC, just
to switch it temporarily to inactive mode
(Standby), move the third lever to position 3›››
Fig. 211 or pre s
s the brake pedal.
It will also switch to inactive mode (Standby)
if the vehicle is stopped and the driver door
is opened.
Adjusting the default distance level at the
start of your journey.
In wet road conditions, you should always set
a larger distance with regard to the vehicle in
front than when driving in dry conditions.
The following distances can be preselected:
● Very short
● Short
● Media
● Long
● Very long In the Easy Connect system you can adjust
the dis
t

ance level that will be applied when
the ACC is connected using the  button
and the S
ET
TINGS and
Driv
er a
s
sistance function
b utt
on
s ›››
 page 33.
Changing the driving profile
In vehicles with SEAT Drive Profile , the driving
profile selected can have an influence on the
ACC’s acceleration and braking behaviour
››› page 230.
In vehicles without SEAT Drive Profile , the be-
haviour of the ACC can also be affected by se-
lecting any of the following drive profiles in
the Easy Connect system:
● Normal
● Sport
● Eco
● Convenience
In this c
ase, you should access the ACC set-
tings using the  button and the
S
ET
TINGS >
Driv er a
s

sistance >
A
C
C function buttons
› ›
›
 page 33.
The following conditions may lead the ACC
not to react:
● If the accelerator is pressed.
● If there is no gear engaged.
● If the ESC is controlling. ●
If the driver i
s not wearing his/her seat
belt.
● If several brake lights of the vehicle or elec-
trically
connected trailer are damaged.
● If the vehicle is reversing.
● Driving faster than 210 km/h (150 mph).
Driver mes
sages
 ACC not available
The system can no longer continue to guar-
antee safe vehicle detection and will be de-
activated. The sensor has lost its setting or is
damaged. Take the vehicle to a specialised
workshop and have the fault repaired.  ACC and Front Assist: cur-
rently not available. No sensor
vision
This message will be displayed to the driver if
the radar sensor's vision is impaired due, for
example, to leaves, snow, heavy fog or dirt.
Clean the SEAT badge ››› Fig. 210.
 ACC: currently not available.
Gradient too steep
The maximum road slope has been excee-
ded, hence safe ACC operation cannot be
guaranteed. The ACC cannot be switched on.  ACC: only available in D, S
or M
Select the D/S or M position on the selector
lever. »
219Technical data
Advice
Operation
Emergencies
Safety

Operation
 ACC: parking brake applied
The A C
C is deactivated if the parking brake is
applied. The ACC is available once again after
the parking brake is released.
 ACC: currently not available.
Intervention of stability con-
trol
The message for the driver is displayed when
the electronic stability control (ESC) inter-
venes. In this case, the ACC is automatically
switched off.  ACC: Take action!
The message for the driver is displayed if,
when the vehicle starts up on a hill with a
mild slope, the vehicle rolls back even al-
though the ACC is activated. Apply the brake
to stop the vehicle from moving/colliding
with another vehicle.  ACC: speed limit
The message for the driver is displayed if, in
vehicles with manual gearbox, the current
speed is too low for the ACC mode.
The speed to be stored must be at least
30 km/h (18 mph). The speed limiter
switches off if the speed falls below 20 km/h
(12 mph).  ACC: available as of the 2nd
gear The ACC is operational as of the 2nd gear
(manual g
earbox).
 ACC: engine speed
The message for the driver is displayed if,
when the ACC accelerates or brakes, the driv-
er does not shift up or down a gear in time,
which means exceeding or not reaching the
permissible engine speed. The ACC switches
itself off. A buzzer warning is heard.  ACC: clutch pressed
Vehicles with a manual gearbox: pressing the
clutch pedal for longer abandons control
mode. Door open
Vehicles with automatic gearbox: the ACC
cannot be activated with the vehicle station-
ary and the door open. WARNING
There is a danger of rear collision when the
minimum dis t

ance to the vehicle in front is
exceeded and the speed difference between
both vehicles is so great that a speed reduc-
tion by the ACC will not suffice. In this case
the brake pedal should be applied immedi-
ately.
● The ACC may not be able to detect all situa-
tions pr
operly.
● “Stepping” on the accelerator may cause
the ACC
not to intervene in braking. Driver braking will have priority over intervention by
the speed c
ontr

ol or adaptive cruise control.
● Always be ready to use the brakes!
● Observe country-specific provisions gov-
erning ob
ligatory minimum distances be-
tween vehicles. Note
● The pr ogrammed s

peed is erased once the
ignition or the ACC are switched off.
● When the traction control system (ASR) is
deactivat
ed during acceleration or else the
ESC is activated in Sport* Mode
( ››› page 120), the ACC switches off automati-
cally.
● In vehicles with the Start-Stop system, the
engine swit
ches off automatically during the
ACC stopping phase and restarts automatical-
ly to begin driving. 220

Driver assistance systems
Function for preventing overtaking in
an in s
ide l
aneFig. 213
On the instrument panel display:
A C
C

active, vehicle detected in an outer lane. The adaptive cruise control (ACC) has a func-
tion th
at
help

s avoid overtaking while driving
in inside lanes at certain speeds.
If another vehicle is detected travelling at a
slower speed in an outer lane, it is displayed
on the multifunction display ››› Fig. 213.
To avoid overtaking while driving in an inside
lane the system will gently brake, and in ac-
cordance with the speed will prevent the car
from overtaking. The driver can override this
function at any time. Deactivating the Adaptive Cruise Con-
trol

ACC temporarily in certain situa-
tions In the following situations the Adaptive
Crui
se C

ontrol (ACC) should be deactivated
due to the system's limitations ››› :
● When changing lanes, on tight bends and
rou nd

abouts, in acceleration and decelera-
tion lanes on motorways or in sections with
road works to prevent involuntary accelera-
tion to reach the programmed speed.
● When going through a tunnel, as operation
cou l

d be affected.
● On roads with several lanes, when other ve-
hicle
s are driving more slowly in the overtak-
ing lane. In this case, slower vehicles will be
overtaken on the right.
● In case of heavy rain, snow or spray, as the
vehicl
e in front might not be detected proper-
ly or, in certain circumstances, might not be
detected at all. WARNING
If the ACC does not switch off in the situa-
tions de

scribed, serious accidents and inju-
ries may occur.
● Always switch off the ACC in critical situa-
tions. Note
If you do not switch off the ACC in the afore-
mentioned sit uation

s, you may commit a le-
gal offence. 221
Technical data
Advice
Operation
Emergencies
Safety

Operation
Special driving situations Fig. 214
(A) Vehicle on a bend. (B) Motorcy-
c li
s
t ahead out of range of the radar sensor. Fig. 215
(C) Vehicle changing lanes. (D) One
v ehic
l

e turning and another stationary. The adaptive cruise control (ACC) has certain
ph
y
s

ical limitations inherent in the system.
For example, certain reactions of the ACC, in
certain circumstances, may be unexpected or
come late from the driver's point of view. So
pay attention in order to intervene if necessa-
ry.
For example, the following traffic situations
call for the utmost attention:
Starting driving after a stopping phase (only
vehicles with automatic gearbox)
After a stopping phase, the ACC may begin
driving automatically when the vehicle in
front drives off ››› .When the ACC halts the vehicle (e.g. traffic
j
am), the in
s

trument panel display shows the
ACC ready to start message. If the ve-
hicle ahead drives off again, the ACC will also
do so automatically.
If the vehicle ahead does not drive off again,
the vehicle can be kept indefinitely in the
ACC ready to start status by operating
the third lever repeatedly towards position 2
› ››
Fig. 211
or b
y pressing the brake pedal.
If the Press the brake message is shown
on the instrument panel, press the brake. If
you do not, an acoustic warning will be heard
and the ACC will switch to inactive mode
(Standby). At this point, the vehicle may be-
gin to move towards the stopped vehicle
ahead ››› .
Ov er
t

aking
When the turn signal lights up before the ve-
hicle begins an overtaking manoeuvre, the
ACC accelerates the vehicle automatically
and thus reduces the distance from the vehi-
cle in front.
When the vehicle enters the overtaking lane,
if the ACC does not detect another vehicle in
front, it accelerates until it reaches the pro-
grammed speed and maintains it.
System acceleration can be interrupted at
any time by pressing the brake or moving the
third lever backwards ››› page 218.
222