display Seat Leon 5D 2017 Workshop Manual

Driver assistance systems
Radar sensor Fig. 210
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. 210 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
adaptive cruise control (ACC) does not work.
The instrument panel displays the following
message: ACC: No sensor vision! If
necessary, clean the sensor ››› .
When the r a
d

ar sensor begins to operate
properly again, the ACC will automatically be
available again. The message on the instru-
ment panel screen will switch off and the ACC
will be reactivated again.
ACC operation may be affected by a strong ra-
dar reverse reflection. This may occur, for ex-
ample, 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 ACC 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, ACC operation may be affected. In this
scenario, SEAT recommends visiting a SEAT
dealership. CAUTION
If you have the sensation that the radar sen-
sor is d

amaged or has lost its settings, dis-
connect the ACC. This will avoid possible
damage. If this occurs have it adjusted.
● 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. ●
Cle

an away the snow with a brush and the
ice preferably with a solvent-free de-icer
spray. 217
Technical data
Advice
Operation
Emergencies
Safety

Operation
Operating the Adaptive Cruise Control
A C
C Fig. 211
On the left of the steering column:
thir d l
ev
er for operating the Adaptive Cruise
Control. Fig. 212
On the left of the steering column:
thir d l
ev

er for operating the Adaptive Cruise
Control. When the Adaptive Cruise Control (ACC) is
c
onnect
ed, the gr

een control lamp  will
light up on the instrument panel, and the programmed speed and ACC status will be
disp

layed ››› Fig. 209.
What ACC settings are possible? ● Setting your speed ›››
page 218.
● Setting your distance ›››
page 218.
● Connecting and activating the ACC
›››
page 218.
● Disconnecting and deactivating the ACC
›››
page 219.
● Adjusting the default distance level at the
star
t of your journey ››› page 219.
● Adjusting the driving profile ›››
page 219.
● Conditions in which the ACC does not react
›››
page 219.
Setting speed
To set your speed, move the third lever loca-
ted in position 1 upwards or downwards un-
ti l
the de

sired speed is shown on the instru-
ment panel display. The speed adjustment is
made at 10 km/h (6 mph) intervals.
Once you are driving , if you wish to set the
current speed as the vehicle’s cruise speed
and activate the ACC, press the  button
››› Fig. 212. If you wish to increase or reduce
speed by intervals of 1 km/h (0.6 mph),
move the lever to position 2
›
››

Fig. 211 or
press the  button, respectively.
The set speed can be changed when the ve-
hicle is stopped or during driving, as you like. Any modification to the programmed speed
wil

l be shown on the bottom left part of the
instrument panel display ››› Fig. 209.
Setting your distance level
To increase/reduce the distance level, press
the rocker switch towards the left/right
››› Fig. 212 A .
The in s
trument

panel display shows the mod-
ification of the distance level. There are 5 dis-
tance levels to choose from. SEAT recom-
mends level 3. The set distance can be
changed when the vehicle is stopped or dur-
ing driving, as you like ››› .
C onnectin
g and activ

ating the ACC
To connect and activate the ACC, the position
of the gearbox selector lever, the vehicle
speed and the position of the third level of
the ACC must all be taken into account.
● With a manual gearbox, the gearbox selec-
tor lev
er must be in any gear except first, and
speed must be greater than approximately 30
km/h. With an automatic gearbox, the gear-
box selector lever must be in position D or S.
● To activate the ACC, with the third lever in
position 1 press the
 butt
on or mo
ve the
third lever of the ACC to position 2 ›››
Fig. 211. At thi s

point, the image of the
ACC on the instrument panel display will
switch to Active mode ››› Fig. 209.
218

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

Driver assistance systems
Driving through a bend
On ent erin
g or e
xiting bends, the radar sen-
sor may no longer determine the vehicle in
front or react to a vehicle in the adjacent lane
››› Fig. 214 A. In these situations the vehicle
may brake unnecessarily or fail to react to re-
act to the vehicle in front. In this case, the
driver has to intervene by accelerating or in-
terrupting the braking process by applying
the brake or pushing the third lever back-
wards ››› page 218.
Driving in tunnels
When driving through tunnels the radar sen-
sor may be limited. Switch off the ACC in tun-
nels.
Narrow or misaligned vehicles
The radar sensor can only detect narrow or
misaligned vehicles when they are within
range ››› Fig. 214 B. This applies particularly
to narrow vehicles such as motorbikes. In
these cases, you should brake as necessary.
Vehicles with special loads and accessories
Special loads and accessories of other vehi-
cles that jut out over the sides, backwards or
over the top may be out of the ACC's range.
Switch off the ACC when driving behind vehi-
cles with special loads and accessories or
when overtaking them. In these cases, you
should brake as necessary. Other vehicles changing lanes
Vehicl
es changing lanes a short distance
away from your own can only be detected
when they are within range of the sensors.
Consequently, the ACC will take longer to re-
act ››› Fig. 215 C. In these cases, you should
brake as necessary.
Stationary vehicles
The ACC does not detect stationary objects
while driving, such as traffic tails or damaged
vehicles.
If a vehicle detected by the ACC turns or
moves over and there is a stationary vehicle
in front of it, the ACC will not react to it
››› Fig. 215 D. In these cases, you should
brake as necessary.
Vehicles driving in the opposite direction
and vehicles crossing your path
The ACC does not react to vehicles approach-
ing from the opposite direction or vehicles
crossing your path.
Metal objects
Metal objects, e.g. rails on the road or sheets
used in road works, can confuse the radar
sensor and cause the ACC to react wrongly. Factors that may affect how the radar sensor
operate
s
If laser sensor operation is impaired, due to
heavy rain, spray, snow or mud, the ACC is
deactivated temporarily. The relevant text
message will appear in the dash panel dis-
play. If necessary, clean the radar sensor.
When the radar sensor begins to operate
properly again, the ACC will automatically be
available again. The message on the instru-
ment panel screen will switch off and the ACC
will be reactivated again.
ACC operation may be affected by a strong ra-
dar reverse reflection, for example in a closed
car park.
Trailer mode
When driving with trailer the ACC controls
less dynamically.
Overheated brakes
If the brakes overheat, for example after
abrupt braking or in long and steep slopes,
the ACC may be deactivated temporarily. The
relevant text message will appear in the dash
panel display. In this case, adaptive cruise
control cannot be activated.
Adaptive cruise control can be reactivated
once brake temperature has cooled suffi-
ciently. The message will disappear from the
instrument panel display. If the message ACC
not available remains on for quite a long »
223
Technical data
Advice
Operation
Emergencies
Safety

Operation
time it means that there is a fault. Contact a
s pec
i
alised workshop. SEAT recommends vis-
iting a SEAT dealership. WARNING
If you do not heed the Press the brake
mes s

age, the vehicle may initiate an involun-
tary movement and could crash into the vehi-
cle ahead. In any event, before driving off,
check that the road is clear. The radar sensor
may not detect obstacles on the road. This
could cause an accident and serious injuries.
If necessary, apply the brake. Lane Assist system*
Intr oduction Fig. 216
In the windscreen: field of vision of
the Lane As s
i

st system camera. Using the camera located in the windscreen,
the Lane As
s
i

st system detects the possible
lines dividing the lanes. When the vehicle in-
voluntarily approaches a dividing line it has
detected, the system notifies the driver with
a corrective steering movement . The purpose
is not only to warn the driver, but also to
keep the vehicle inside the lane. This move-
ment can be over-regulated at any time.
No warning is produced with the turn signals
activated, given that the Lane Assist system
understands that a lane change is required. Indications on the display and lamps Fig. 217
On the instrument panel display: In-
dic ation on the Lane As
s

ist system display
(example 1). 224

Driver assistance systems
Fig. 218
On the instrument panel display: In-
dic ation on the Lane As
s
ist system display
(example 2). Status display
The sy s
t

em is active, but not available,
either because the minimum speed has
not been reached or because the lane
lines are not recognised ››› Fig. 217 A.
The system is active and available, both
lane lines are recognised. The steering
angle is not being corrected at this mo-
ment ››› Fig. 217 B.
–
– The system is operational, the highligh-
ted line
A indicates that there was a
ri sk
of

involuntarily crossing the lane
line and that the steering is being adjus-
ted to correct the angle ››› Fig. 218 C.
The two highlighted lines A light up si-
mu lt
aneou

sly when both lane lines are
recognised and the Lane Assist function
is active ››› Fig. 218 D.
Control lamps 
It lights up yellow: Lane Assist active
but not available.
The system can not accurately recognise the lane.
Please see page 226, the Lane Assist system is not
available (the control lamp is lit up yellow). 
It lights up green
Lane Assist system active and available.
WARNING
Observe the safety warnings ›››
in Warning
and contr o
l lamps on page 119. Operating mode
Steering wheel vibration
The f
ol

lowing situations can cause vibration
in the steering wheel and require the driver
to take active control of driving: –
– ●
When the steerin
g angle assist value re-
quired to keep the vehicle in the lane is high-
er than the system’s maximum operating val-
ue.
● If the system ceases to display the lane
lines whi
le assisting with steering.
Switching the Lane Assist system on or off
Through the Easy Connect system
● Press the Easy Connect button  ●
Press the S
ET
TINGS function button
● Press the function button Driv
er a
s
sistance to
open the menu.
OR: U s
in
g the Driving Assist button on
the turn signal lever* ›››
 page 37.
Lane Assist with Lane Centring Guide
The Lane Centring Guide function is in-
tended to keep the vehicle in the centre of
the lane.
If the driver has a tendency to veer slightly off
centre in the lane, the system adapts to driv-
er preferences.
The Lane Centring Guide function is ac-
tivated/deactivated in the Easy Connect sys-
tem using the  button and the
S
ET
TINGS function button
›
››

page 120. »
225
Technical data
Advice
Operation
Emergencies
Safety

Operation
● When mor e att
ention i
s required by the
driver.
● When driving in a very sporty style.
● In adverse weather conditions, e.g. in case
of sno
w or heavy rain.
● When driving on roads in poor condition.
● In sections with roadworks.
● In city journeys. WARNING
The smart technology incorporated into Traf-
fic Jam As s

ist cannot defy the laws of phys-
ics; it only works within the limits of the sys-
tem. Accidents and severe injury may occur if
Traffic Jam Assist is used negligently or invol-
untarily. The system is not a replacement for
driver awareness.
● Adapt your speed and safe distance to the
vehicl
e in front of you at all times to suit the
visibility, weather, road and traffic condi-
tions.
● Do not use Traffic Jam Assist in city jour-
neys.
● Do not u

se Traffic Jam Assist if there is poor
vis
ibility, for example, in case of snow, ice,
rain or loose gravel, or on steep or slippery
sections or flooded roads.
● Do not use Traffic Jam Assist offroad or on
roa
ds where the surface is not firm. Traffic
Jam Assist has been designed for use on
paved roads only. ●
Traffic

Jam Assist does not react to people
or animals or vehicles crossing your path or
that approach you head-on down the same
lane.
● If Traffic Jam Assist does not reduce speed
sufficiently
, brake the vehicle immediately by
applying the pedal.
● If the vehicle continues to move when you
wish it
to stop after a driver intervention
prompt, brake the vehicle by applying the
pedal.
● If driver intervention is requested on the
da
sh panel display, immediately resume con-
trol of the vehicle.
● Keep your hands on the wheel at all times
to be re
ady to intervene in the steering at any
time. The driver is always responsible for
keeping the vehicle in its own lane.
● Always be prepared to take charge of driv-
ing (acc
elerating or braking) yourself. Note
● If T

raffic Jam Assist does not work as de-
scribed in this chapter, stop using it and con-
tact a specialised workshop.
● If the system is faulty, take it to a special-
ised work
shop and have it checked. Emergency Assist
D e
s

cription and operation Emergency Assist detects whether there is in-
activity
b

y the driver and can automatically
keep the car within the lane and stop it alto-
gether if necessary. This way the system can
actively help avoid an accident.
Emergency Assist is an additional function of
Lane Assist ››› page 224 and combines Lane
Assist functions with Adaptive Cruise Control
(ACC) ›››
page 214. Therefore, it is essential
that you read these two chapters carefully
and note the limitations of the systems and
the information about them.
Operation of Emergency Assist
Emergency Assist detects when the driver
ceases to perform any activity and repeatedly
requests that he/she regain active control of
the vehicle, through the use of optical and
acoustic warnings and by applying the
brakes.
If the driver continues to do nothing, the sys-
tem automatically takes over the accelerator,
brakes and steering in order to brake the ve-
hicle and keep it in its lane ››› . When the
Emer g
ency

Assist is actively adjusting, the
hazard warning lights come on ›››
page 145
and the vehicle makes slight zigzag move-
ments in the lane in order to warn other driv-
ers.
228