2013 Seat Leon SC lane assist

199
Driver assistance systems
Special driving situations
Fig. 136 (A) Vehicle on a
bend. (B) Motorcyclist
driving ahead out of
range of the radar sensor.
Fig. 137 (C) Other vehi-
cle changing lanes (D)
Vehicle turning and an-
other one stopped.
The Adaptive Cruise Control (ACC) has certain physical limitations inherent
in the system. For example, some of the ACC's reactions, in certain circum-
stances, may be unexpected or occur at the wrong time as far as the driver
is concerned. Therefore, be on the lookout in case you have to intervene.
For example, the following traffic situations call for the utmost attention:
Deceleration until the vehicle comes to a halt (only vehicles with automatic
gearbox)
If the vehicle in front reduces speed and stops, the ACC will do the same
with your own vehicle. After the vehicle has been stopped for approx. 3 sec-
onds, the system will warn the driver that he has to take control by means of
an acoustic and visual warning on the instrument panel.
Starting up after a halt phase (only vehicles with automatic gearbox)
After a halt phase, the ACC can start driving automatically as soon as the
vehicle ahead begins to move again. 
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200Driver assistance systems
Overtaking
When the turn signal comes on before overtaking, the ACC accelerates the
vehicle automatically and thus reduces the distance between it and the ve-
hicle ahead.
When you move into the overtaking lane, if the ACC does not detect any ve-
hicle in front it accelerates until it reaches the stored speed and keeps it
constant.
The acceleration can be interrupted at any time by stepping on the brake
pedal or pulling back on the lever ⇒ page 193.
Driving through a bend
On entering or coming out of a bend, the radar sensor may no longer detect
the vehicle ahead of it or may react before a vehicle in the adjacent lane
⇒ Fig. 136 A. In such situations the vehicle may brake unnecessarily or may
cease to react with regard to the vehicle ahead. In this case, the driver has
to act by accelerating or interrupting the braking process by stepping on the
brake pedal or pulling the third lever backwards ⇒ page 193.
Driving in tunnels
When going through tunnels, the radar sensor function may be limited.
Switch off the ACC in tunnels.
Narrow vehicles or vehicles not driving straight
The radar sensor can only detect narrow vehicles or those that are not driv-
ing straight within its range ⇒ Fig. 136 B. This is particularly applicable to
narrow vehicles such as motorbikes. In these cases, brake yourself as nec-
essary.
Vehicles with loads and special accessories
The load and special accessories of other vehicles that jut out over the side,
backwards or forward may be outside the range of the ACC.
Switch off the ACC when driving behind vehicles with loads or special acces-
sories, as well as when overtaking these vehicles. In these cases, brake
yourself as necessary. Other vehicles changing lanes
Vehicles changing lanes not far away from the vehicle can only be detected
when they fall within the range of the sensors. Consequently, the ACC will
take longer to react
⇒ Fig. 137 C. In these cases, brake yourself if necessary.
Stationary vehicles
During driving, the ACC does not detect stationary objects, such as the end
of a jam or damaged vehicles.
If a vehicle detected by ACC turns or moves over and there is another sta-
tionary vehicle in front of it, the ACC will not react ⇒ Fig. 137 D. In these ca-
ses, brake yourself if necessary.
Vehicles travelling in the opposite direction and vehicles changing lanes
The ACC does not react to vehicles approaching in the opposite direction or
vehicles changing lanes.
Metal objects
Metal objects, e.g. rails on the road or the panels used on work sites, may
confuse the radar sensor and cause wrong reactions in the ACC.
Factors that may affect the operation of the radar sensor
If the operation of the radar sensor were affected by heavy rain, water mist,
snow or mud, the ACC is switched off temporarily. The relevant message ap-
pears on the instrument panel display. If necessary, clean the radar sensor.
When the radar sensor works properly again, the ACC will be automatically
available again. The message on the instrument panel display will go off
and the ACC can be switched on again.
In the event of a heavy reverse reflection of the radar signal, for example, in
a closed parking, ACC operation may be affected.
Trailer towing
When driving with a trailer, the ACC controls less dynamically. 

203
Driver assistance systems
WARNING (Continued)
● In complex driving conditions, the Front Assist may unnecessarily
warn and act unintentionally on the brakes, such as, for example, in the
case of traffic islands.
● If the operation of the Front Assist is impaired, for example, because
of dirt or because the radar sensor has lost its setting, the system may
issue unnecessary warnings and act inappropriately on the brakes.
● The ACC does not react during driving to people or animals or vehi-
cles changing lane or approaching in the opposite direction in the same
lane.
● The driver must always be ready to take control of the vehicle again.
Note
● When the Front Assist causes a braking, the brake pedal is “harder”.
● Automatic interventions in the Front Assist braking may be interrupted
by pressing the clutch pedal, accelerator or moving the steering wheel.
● If the Front Assist does not work as described in this chapter (e.g. if it
intervenes several times unnecessarily), switch it off. Have the system
checked by a specialised workshop. SEAT recommends visiting a SEAT deal-
ership. Warning lamps and messages on the display
Fig. 138 On the instrument panel display: Warning messages
Lights upPossible cause ⇒ Solution

Collision warning
a)
. The sys-
tem detects a possible colli-
sion with the vehicle in
front.Brake or change course! Use
the foot brake!
Safety distance warning
with the vehicle in front.Increase the safety dis-
tance!
a) The symbol is in colour on the instrument panel with colour display.
Distance warning
If the safety distance with the vehicle ahead is exceeded, the instrument
panel display shows the following warning ⇒ Fig. 138 
(magnified image).
Increase the distance! 
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206Driver assistance systems
WARNING
If the Front Assist is not switched off in the aforementioned situations,
accidents and serious injuries may be caused.
● Switch off the Front Assist in critical situations.

System limitations
The Front Assist Monitoring System has certain physical limitations inherent
in the system. Thus, for example, in certain circumstances some system re-
actions may be inappropriate or occur with delays as far as the driver is con-
cerned. Therefore, be on the lookout in case you have to intervene.
The following conditions may lead the Front Assist Monitoring System not
to react or react too late:
● When taking tight bends.
● If you step on the accelerator too hard
● If the Front Assist is switched off or damaged.
● If the ASR has been manually disconnected.
● If the ESC is controlling.
● If several brake lights on the vehicle or trailer have electrical faults.
● If the radar sensor is dirty or covered.
● If there are metal objects, e.g., rails on the road or the panels used on
work sites.
● If the vehicle is reversing.
● If the vehicle over-accelerates.
● In snow or heavy rain.
● In the case of narrow vehicles such as motorbikes.
● In the case of vehicles not driving straight.
● In the case of vehicles changing lanes. ●
In the case of vehicles approaching each other in the opposite direction.
● Loads and special accessories in other vehicles jutting out over the
sides, front or rear. 
City emergency braking function
Fig. 140 On the instru-
ment panel display: pre-
warning message
The City emergency braking function is part of the Front Assist Monitoring
System and is always active when this system is on.
Depending on the equipment, the City emergency braking function can be
switched on or off on the Easy Connect system using the button 
and the
function buttons  and Driver Assist ⇒ page 80.
The City emergency braking function detects, at speeds between 5 km/h
(3 mph) and 30 km/h (19 mph) approx., the situation of the traffic in front
of the vehicle up to a distance of approx. 10 m.
If the system detects a possible collision with a vehicle in front, the vehicle
prepares for a possible emergency braking ⇒ 
.

207
Driver assistance systems
If the driver does not react to a collision hazard, the system can automati-
cally brake the vehicle by progressively increasing braking pressure to re-
duce speed in the event of a collision. The system can thus help to reduce
the consequences of an accident.
Status display
Automatic deceleration by the City emergency braking function is shown on
the instrument panel display by means of a pre-warning message
⇒ Fig. 140 1)
.
WARNING
The smart technology included in the City emergency braking function
cannot defy the laws of physics. The driver is always responsible for
braking in time.
● Always adapt speed and safety distance to the vehicle ahead accord-
ing to visibility, weather, road and traffic conditions.
● The City emergency braking function alone cannot prevent accidents
or serious injury.
● In complex driving conditions, the City emergency braking function
may act on the brakes, for example, in areas with road works or metal
rails.
● If the City emergency braking function is impaired, for example, be-
cause of dirt or because the radar sensor has lost its setting, the system
may issue unnecessary warnings and act inappropriately on the brakes.
● The City emergency braking function does not react during driving to
people or animals or vehicles changing lane or approaching in the oppo-
site direction in the same lane.
Note
● When the City emergency braking function causes a braking, the brake
pedal is “harder”.
● Automatic interventions in the City emergency braking function may be
interrupted by pressing the clutch pedal, accelerator or moving the steering
wheel.
● The City emergency braking function can decelerate the vehicle and
bring it to a standstill. However, the brake system does not halt the vehicle
permanently. Use the foot brake!
● If several inappropriate interventions take place, disconnect the Front
Assist and with it the City emergency braking function. Visit a specialised
workshop, SEAT recommends a SEAT dealer.
● If numerous unfounded interventions occur the City emergency braking
function may disconnect automatically 
Lane Assist system* Introduction
Additional information and warnings:
● SEAT information system ⇒  page 73
● Accessories, parts replacement, repairs and modifications ⇒ page 272 
1)
The symbol is in colour on the instrument panel with colour display.
Safety FirstOperating instructionsPractical TipsTechnical specifications

208Driver assistance systems
WARNING
The intelligent technology in the Lane Assist system cannot change the
limits imposed by the laws of physics and by the very nature of the sys-
tem. Careless or uncontrolled use of the Lane Assist system may cause
accidents and injury. The system is not a replacement for driver aware-
ness.
● Always adapt your speed and the distance to the vehicles ahead in
line with visibility, weather conditions, the condition of the road and the
traffic situation.
● Always keep your hands on the steering wheel so it can be turned at
any time.
● The Lane Assist system does not detect all road markings. The road
surfaces, road structures or objects in poor condition can be incorrectly
detected as road markings under certain circumstances by the Lane As-
sist system. In such situations, switch the Lane Assist system off imme-
diately.
● Please observe the indications on the instrument panel and act as is
necessary.
● Always pay attention to the vehicle's surroundings.
● When the area of vision of the camera becomes dirty, covered or is
damaged, the Lane Assist system function can be affected.
CAUTION
In order to avoid influencing the operation of the system, the following
points must be taken into account:
● Regularly clean the area of vision of the camera and keep it in a clean
state, without snow or ice.
● Do not cover the area of vision of the camera.
● Check that the area of vision of the windscreen camera is not damaged.
Note
● The Lane Assist system has been exclusively developed for driving on
paved roads only.
● If the Lane Assist system does not work as described in this chapter, do
not use it and contact a specialised workshop.
● If there is a fault in the system, have it checked by a specialised work-
shop. 

209
Driver assistance systems
Indication on the display and warning lamps
Fig. 141 On the instrument panel display: Indication on the Lane Assist system dis-
play (example 1)
Fig. 142 On the instrument panel display: Indication on the Lane Assist system dis-
play (example 2) Indications on the display
The system is active, but not available, either because the minimum
speed has not been reached or because the lane lines are not recog-
nised ⇒ Fig. 141 .
The system is active and available, both lane lines are recognised. The
steering angle is not being corrected at this moment ⇒ Fig. 141 .
The system is operational, a highlighted line A
indicates that there
was a risk of involuntarily crossing the lane line and that the steering is
being adjusted to correct the angle ⇒ Fig. 142 .
The two highlighted lines A
light up simultaneously when both lane
lines are recognised and the Lane Assist function is active ⇒ Fig. 142
.
Control lamps
flashes or
lights upPossible causeSolution

(yellow)Lane Assist active but
not available.The system can not accurately recog-
nise the lane. Please see page 210,
The Lane Assist system is not availa-
ble (the control lamp is lit up yellow).

(green)Lane Assist system ac-
tive and available._
WARNING
If the warning lamps and messages are ignored, the vehicle may stall in
traffic, or may cause accidents and severe injuries.
● Never ignore the warning lamps or text messages.
● Stop the vehicle safely as soon as possible. 
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–
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210Driver assistance systems
Note
Failure to heed the control lamps and text messages when they appear may
result in faults in the vehicle. 
Operating mode
Fig. 143 In the wind-
screen: Field of vision of
the Lane Assist system
camera
Using the camera located in the windscreen, the Lane Assist system detects
the possible lines dividing the lanes. When the vehicle involuntarily ap-
proaches a dividing line it has detected, the system notifies the driver with
a corrective steering movement . The corrective steering movement can be
overruled at any moment.
No warning is produced with the turn signals activated, given that the Lane
Assist system understands that a lane change is required.
Steering wheel vibration
The following situations cause vibration in the steering wheel and require
the driver to take active control of driving: ●
When the limits of the very nature of the system are reached.
● When the maximum rotational torque during the corrective steering
movement is not enough to keep the vehicle inside the lane.
● When no lane is detected during the corrective steering movement.
Switching the Lane Assist system on or off
Through the Easy Connect system
● Push the Easy Connect button CAR
●
Push the Setup function button
● Push the driver assist function button to open the menu
Alternatively: through the driving assist button on the turn signal level*. The Lane centring guide is activated/deactivated in the Easy Connect system
using the CAR
button and the button on the Setup function ⇒ page 79.
Self-deactivation: The Lane Assist system can be automatically deactivated
if there is a system malfunction. The control lamp disappears.
Hands-Off Function
● If the driver does not exert any physical action on the steering wheel for
about 10 to 12 sec. the function deactivates.
● Visual and audible warnings on the instrument panel.
● The function switches off 2 seconds after the warning.
The Lane Assist system is active but it is not available (the control lamp is
lit up yellow)
● When driving at speeds below 65 km/h (38 mph).
● When the Lane Assist system does not detect the dividing lines of the
road. For example, in the event warnings indicating road works, and snow,
dirt, moisture or reflections.
● When the radius of a curve is too small.
● When no road markings can be seen.
● When the distance to the next marking to too great. 