wheel Seat Leon 2020 Owner's Guide

Driver assistance systems
Lane Assist* Intr oduction The Lane Assist System helps the driver
st
ay in his/her l
ane within the physical lim-
its of the system. This function is not suita-
ble and is not designed to keep the vehicle
automatically in the lane.
Using the camera located in the windscreen,
the Lane Assist system detects the limits (lane
lines) dividing the lanes in which the vehicle is
travelling. If the vehicle gets too close to the
detected lane limits, the system alerts the
driver through a corrective motion of the
steering wheel. The driver can cancel the
steering corrective action 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.
System limits
Use the Lane Assist system only on large,
well-maintained motorways and highways.
The system is not available under the follow-
ing conditions:

Driver assistance systems
Operating Travel Assist Fig. 187
Left side of the multifunction steering
wheel : butt
ons for operating Travel Assist. Connecting

Driving
the driver take control of the vehicle. To do
this, it emits optical and acoustic w arnings
and causes br
aking jolts. The seat belt is
tightened (depending on the equipment). The
system slows down the vehicle and keeps it in
its lane.
You can cancel the adjustment at any time
by moving the steering wheel, over-acceler-
ating or braking.
While the emergency assistant is in operation,
other road users are warned as follows:

Braking and parking
Brake assist systems Electronic Stability Control (ESC)
The ESC helps t
o impr
ove safety. It reduces
the tendency to skid and improves the stabili-
ty and roadholding of the vehicle. The ESC
detects critical handling situations, such as
vehicle understeer or oversteer, or wheelspin
on the driving wheels. It stabilises the vehicle
by braking individual wheels or by reducing
the engine torque. The warning lamp will
flash on the instrument panel when the ESC is
intervening !.
The ESC includes the anti-lock brake system
(ABS), the hydraulic brake assist (HBA), the
traction control system (TCS), electronic dif-
ferential lock (EDS), electronic torque control
(XDS) and the tractor-trailer sway mitiga-
tion*.
ESC also helps stabilise the vehicle by
changing the torque.
The TCS can be deactivated when wheel
spin is desirable ››› page 281
.
Anti-lock brake system (ABS)
ABS prevents the wheels from locking up un-
der braking until the vehicle has reached a
virtual standstill. You can continue to steer the
vehicle even when the brakes are on full.
Keep your foot on the brake pedal and do not
pump the brakes. You will feel the brake pedal
pulsate while the ABS is working. If the running gear or brake system is modi-
fied, the eff
ectiv

eness of the ABS could be se-
verely limited.
Hydraulic Brake Assist (HBA)
The brake assist system can reduce the re-
quired braking distance. The braking force is
automatically boosted if you press the brake
pedal quickly in an emergency. You must
keep pressing the brake pedal until the dan-
ger has passed.
Traction control (TCS)
In the event of the wheels spinning, the TCS
reduces the engine torque to adapt to the
road condition. This helps the car to start
moving, accelerate or climb a gradient.
Electronic differential lock (EDL)
When the EDL detects wheelspin, it brakes
the spinning wheel and directs the power to
the other driven wheel. This function is active
up to approximately 100 km/h (62 mph).
To prevent the disc brake of the braked wheel
from overheating, the EDL cuts out automati-
cally if subjected to excessive loads. The ve-
hicle can still be driven. The EDL will switch on
again automatically when the brake has
cooled down. Tractor-trailer sway mitigation*
If the vehicl
e is pulling a trailer, it will control
the following: tractor-trailers tend to sway.
When the swaying of the trailer is felt by the
vehicle and detected by the ESC, it will auto-
matically brake the towing vehicle within the
limits of the system and mitigate the sway.
Tractor-trailer sway mitigation is not available
in all countries ››› page 303
.
Electronic engine torque management
(XDS)
When taking a curve, the driveshaft differen-
tial allows the outer wheel to turn at a higher
speed than the inner wheel. In this way, the
wheel that is turning faster (outer wheel) re-
ceives less drive torque than the inner wheel.
This may mean that in certain situations the
torque delivered to the inner wheel is too
high, causing the wheels to spin. On the other
hand, the outer wheel is receiving a lower
drive torque than it could transmit. This can
cause a loss of grip on the drive axle, in this
case the front axle, which results in under-
steer or “lengthening” of the trajectory.
The XDS can detect and correct this effect
via the sensors and signals of the ESC.
Via the ESC, the XDS will brake the inside
wheel and counter the excess driving torque
of that wheel. This means that the requested
trajectory is much more precise. »
279

Help with parking and manoeuvring
Trailer mode
The P ark Assist syst
em cannot be switched
on if the factory-fitted towing bracket
››› page 298 is electrically connected to a
trailer.
After changing a wheel
If, after changing a wheel, the vehicle stops
entering and exiting parking spaces correct-
ly, the circumference of the new wheel may
be different and the system may need to
adapt to it. The adaptation is automatic and
takes place during driving. Making turns slow-
ly and in both directions (20 km/h [12 mph])
for a few minutes may contribute to this
adaptation process ››› in Introduction on
page 283.
Selecting a parking type Fig. 197
On the instrument panel display: view
of the parking assist syst em with r

educed view. Fig. 198
On the instrument panel display: indi-
cation of parking modes. Park assist has the following 5 parking types:
Re

verse parallel parking.
Reverse angle parking.
Forward angle parking.
Reverse parallel parking without driving
past first: “Help me”.
Forward parking in a parking bay without
driving past first.
Selecting a parking type after passing in
front of the space
After activating the Park Assist system and af-
ter detecting a parking space, the display on
the instrument panel proposes a parking
type. The Park Assist system selects the park-




 ing type automatically. The selected type is
displayed on the instrument clust

er display
››› Fig. 197 and on the infotainment system
display.

Wheels
convenience functions, such as remote vehi-
cl e opening, may not be av
ailable under cer-
tain circumstances. These functions will be
restored when you switch on the ignition and
start the engine.
With the engine switched off
For example, if you listen to the sound system
with the engine switched off the battery will
run down.
If the energy consumption means there is a
risk that the engine will not start, a text will
appear in vehicles with a driver information
system*.
This driver indicator tells you that you must
start the engine so that the battery can re-
charge.
When the engine is running
Although the alternator generates electrical
power, the battery can still become dis-
charged while the vehicle is being driven. This
can occur when a lot of power is being con-
sumed but only a small amount supplied, es-
pecially if the battery is not fully charged ini-
tially.
To restore the necessary energy balance, the
system will then temporarily shut off the elec-
trical devices that are using a lot of power, or
reduce the current they are consuming. Heat-
ing systems in particular use a large amount
of electrical power. If you notice, for instance, that the seat heating* or the rear window
heater is not w
orking, they may have been
temporarily switched off or regulated to a
lower heat output. These systems will be
available again as soon as sufficient electri-
cal power is available.
You may also notice that the engine runs at a
slightly faster idling speed when necessary.
This is quite normal, and no cause for con-
cern. The increased idling speed allows the
alternator to meet the greater power require-
ment and charge the battery at the same
time. Wheels
Wheel s and t
yres
General notes

Practical tips
Low profile tyres
L o
w profile tyres have a wider tread, a larger
wheel diameter and a lower sidewall height.
Therefore, its driving behaviour is more agile.
Low profile tyres may deteriorate more quick-
ly than standard tyres, for instance due to
strong knocks, potholes, manhole covers and
kerbs. Correct tyre pressure is very important
››› page 348.
To avoid damage to tyres and wheels, drive
with special care when driving on roads in
poor condition.
Visually check your wheels every 3000 km.
If the tyres or rims have received a heavy im-
pact or have been damaged, have a special-
ised workshop check whether or not it is nec-
essary to change the tyre.
Low profile tyres may deteriorate more quick-
ly than standard tyres.
Concealed damage
Damage to tyres and rims is often not readily
visible. If you notice unusual vibration or the
car pulling to one side, this may indicate
that one of the tyres is damaged. Reduce
speed immediately if there is any reason to
suspect that damage may have occurred. In-
spect the tyres for damage. If no external
damage is visible, drive slowly and carefully
to the nearest specialised workshop and
have the car inspected. Foreign objects inserted in the tyre

Wheels
New wheels and tyres It is best to have all wheels and tyres serviced
by a specialised w
orkshop
. There they have
the required knowledge, the special tools and
the corresponding spare parts.

Wheels
Driving style
F ast cornering, heavy accel
eration and hard
braking (squealing tyres) all increase tyre
wear.
Wheel balance
The wheels on new vehicles are balanced.
However, certain circumstances may lead to
imbalance (run-out), which is detected as vi-
brations in the steering wheel.
Unbalanced wheels should be rebalanced,
as they otherwise cause excessive wear on
steering, suspension and tyres. A wheel must
also be rebalanced when a new tyre is fitted
or if a tyre is repaired.
Incorrect wheel alignment
Incorrect running gear alignment causes ex-
cessive tyre wear, impairing the safety of the
vehicle. If you notice excessive tyre wear, you
should check wheel alignment at a SEAT Of-
ficial Service. WARNING
Unsuitable handling of the wheels and
t yr

es may lead to sudden tyre pressure los-
ses, to tread separation or even to a blow-
out.

Practical tips
The minimum permitted profile depth 1)
hav e
been r eached when the tyres have worn
down to the wear indicators. Replace the
tyres with new ones ››› .
Changing wheel s ar

ound
To ensure that the wear is equal on all tyres
the wheels should be changed round from
time to time according to the system
››› Fig. 236. The useful life of all the tyres will
then be about the same time. WARNING
The tyres must be replaced at the latest
when the tr ead is w

orn down to the tread
wear indicators. Failure to follow this in-
struction could result in an accident.