technical data Seat Leon SC 2017 Owner's manual

Checking and refilling levels
● If
y
ou continue to smell gas, do not contin-
ue driving!
● Seek specialist assistance. Have the fault
repair
ed.
Regular checks of the natural gas system
The natural gas tanks may be damaged or
corroded by external factors. The walls of the
gas tanks are weakened by deformations,
damage or corrosion. As a result, the tanks
could burst and result in serious injuries or
even death. For this reason, the vehicle own-
er must have a specialised workshop check
(visual check) the gas system every 4 years
at least . The vehicle owner must have a spe-
cialised workshop replace the natural gas
tanks before they reach the end of their serv-
ice life. For further information about the
service life of gas tanks, go to a SEAT dealer
service or a specialised workshop WARNING
Failure to act when you can smell gas in the
vehic l

e or when refuelling can cause serious
injuries.
● Carry out the necessary operations.
● Leave the danger zone.
● If necessary, warn the emergency services. WARNING
The vehicle is not prepared to use liquefied
nat ur

al gas (LNG) and this fuel must not be added under any circumstances. Liquefied
nat
ur

al gas can cause the natural gas tank to
explode, resulting in serious injury. WARNING
Damaged, corroded or rusted tanks can result
in seriou s injur

y or even death.
● Have the natural gas deposits checked at
lea
st every 4 years (visual check).
● Natural gas tanks have a limited service
life. Have the n
atural gas tanks replaced
when required. You can obtain further infor-
mation about this at SEAT dealers or special-
ised workshops. WARNING
If the vehicle underbody touches the ground
or in the event of

a rear collision, there could
be damage to the natural gas tanks.
● Check whether there is a smell of gas.
● If you notice a smell of gas, take the vehicle
to a spec
ialised workshop immediately and
have the natural gas system checked. Note
Have the natural gas system checked regular-
ly b y

a specialised workshop, according to
the Maintenance Programme. 269
Technical data
Advice
Operation
Emergencies
Safety

Checking and refilling levels
●
Tak e c
are not to cause short circuits in the
electrical system, especially when working
on the battery.
● If working inside the engine compartment,
remember that, ev
en when the ignition is
switched off, the radiator fan may start up au-
tomatically, and therefore there is a risk of in-
jury.
● Never cover the engine with additional in-
sul
ating materials such as a blanket. Risk of
fire!
● Do not unscrew the cap on the coolant ex-
pans
ion tank when the engine is hot. The
cooling system is under pressure.
● Protect face, hands and arms by covering
the cap with a l
arge, thick rag to protect
against escaping coolant and steam.
● If it is necessary to work in the engine com-
partment
while the engine is running, the ro-
tating components (for example, poly-V belt,
alternator, radiator fan) and the high voltage
ignition system are an additional hazard.
● Observe the following additional warnings
if work
on the fuel system or the electrical
system is necessary:
– Always disconnect the battery from the
on-board network.
– Do not smoke.
– Never work near naked flames.
– Always keep an approved fire extinguish-
er immediately available. CAUTION
When topping up fluids make sure the correct
fluid is p

ut into the correct filler opening, oth-
erwise this can cause serious malfunctions or
engine damage. For the sake of the environment
Inspect the ground underneath your vehicle
re gu

larly so that any leaks are detected at an
early stage. If you find spots of oil or other
fluids in the area where it was parked, have
your vehicle inspected at the workshop. Note
In right-hand drive vehicles* some brake flu-
id re ser

voirs are on the other side of the en-
gine compartment ››› Fig. 247. Opening the bonnet
Read the additional information carefully
› ›
›

 page 17
The bonnet is released from inside the vehi-
cle.
Check that the windscreen wiper arms are
not unfolded. Otherwise the paint may be
damaged.
The bonnet can only be unlocked when the
driver door is open. WARNING
Never open the bonnet if you see steam or
drips of

coolant being released from the en-
gine compartment. Failure to comply could
result in burns. Wait until no steam or coolant
can be seen before opening the bonnet. Closing the bonnet
–
Slightly lift the bonnet.
– Release the bonnet stay before pressing it
bac k

into its support.
– Carefully close the bonnet.
– Press the bonnet down until it locks into
plac

e.
– Make sure that the bonnet catches onto its
cla

sp. Do not press down too hard ››› .
WARNING
● For s af

ety reasons the bonnet must always
be completely closed when the vehicle is
moving. Therefore, after closing the bonnet,
always check that the locking element is
properly engaged. This is the case if the bon-
net is flush with the adjacent body panels.
● Should you notice that the bonnet is not
safely
secured when the vehicle is moving,
stop the vehicle immediately and close the
bonnet. Failure to follow this instruction
could result in an accident. 271
Technical data
Advice
Operation
Emergencies
Safety

Checking and refilling levels
Checking engine oil level Fig. 248
Engine oil dipstick. Read the additional information carefully
› ›
›
 page 59
The engine oil dipstick indicates the level of
the oil.
Checking oil level
– Park the vehicle in a horizontal position.
– Briefly run the engine at idle speed until
the operating t

emperature is reached and
then stop.
– Wait for about two minutes.
– Pull out the dipstick. Wipe the dipstick with
a cle

an cloth and insert it again, pushing it
in as far as it will go.
– Then pull it out once more and check the oil
level

››› Fig. 248. Top up with engine oil if
necessary. Depending on how you drive and the condi-
tions in whic

h the vehicle is used, oil con-
sumption can be up to 0.5 l/1000 km. Oil
consumption is likely to be higher for the first
5,000 km. For this reason the engine oil level
must be checked at regular intervals, prefera-
bly when filling the tank and before a jour-
ney. WARNING
Any work carried out in the engine compart-
ment or on the en gine mu

st be carried out
cautiously.
● When working in the engine compartment,
alwa
ys observe the safety warnings
››› page 270. CAUTION
If the oil level is above area A , do not start
the engine. Thi

s could result in damage to the
engine and catalytic converter. Contact a
Technical Service. Topping up engine oil
 Fig. 249
In the engine compartment: Engine
oi l
fi

ller cap. Read the additional information carefully
› ›
›

 page 59
Before opening the bonnet, read and observe
the warnings ››› in Working in the engine
c omp
ar

tment on page 270.
The position of the oil filler opening is shown
in the corresponding engine compartment il-
lustration ››› page 270.
Engine oil specification ›››
 page 60. WARNING
Oil is highly inflammable! Ensure that no oil
come s

into contact with hot engine compo-
nents when topping up. » 273
Technical data
Advice
Operation
Emergencies
Safety

Checking and refilling levels
could d amage the engine. If there is no
c oo
lant in the expansion tank, do not con-
tinue driving. You should obtain professio-
nal assistance ››› .
– If there is still some coolant in the expan-
sion t
ank, t

op up to the upper mark.
– Top up with coolant until the level becomes
stab

le.
– Screw the cap back on correctly.
Any lo
ss of coolant fluid normally indicates a
leak in the cooling system. Take the vehicle
straight to a specialised workshop to have
the cooling system examined. If there are no
leaks in the engine cooling system, a loss of
coolant can only occur if the coolant boils
and is forced out of the system as a result of
overheating. WARNING
● The coo lin

g system is under pressure. Do
not unscrew the cap on the coolant expan-
sion tank when the engine is hot: risk of
burns!
● The antifreeze and coolant fluid can be a
health h
azard. Therefore, the antifreeze
should be stored in the original container in a
safe place out of reach of children. Failure to
comply could result in poisoning.
● If working inside the engine compartment,
remember that, ev
en when the ignition is
switched off, the radiator fan may start up au- tomatically, and therefore there is a risk of in-
jury
. WARNING
If there is not enough anti-freeze in the cool-
ant sys

tem, the engine may fail leading to se-
rious damage.
● Please make sure that the percentage of
additiv
e is correct with respect to the lowest
expected ambient temperature in the zone in
which the vehicle is to be used.
● When the outside temperature is very low,
the cool
ant could freeze and the vehicle
would be immobilised. In this case, the heat-
ing would not work either and inadequately
dressed passengers could die of cold. CAUTION
Do not top up the expansion tank with cool-
ant fluid if it

is empty! Air could enter the
cooling system. In this case, stop driving.
Seek specialist assistance. Otherwise, there
is a risk of engine damage. CAUTION
The original additives should never be mixed
with c oo

lants which are not approved by
SEAT. Otherwise, you run the risk of causing
severe damage to the engine and the engine
cooling system.
● If the fluid in the expansion tank is not pur-
ple b
ut is, for example, brown, this indicates that the G13 additive has been mixed with an
ina
dequat

e coolant. The coolant must be
changed as soon as possible if this is the
case! This could result in serious faults and
engine damage. For the sake of the environment
Coolants and additives can contaminate the
en vir

onment. If any fluids are spilled, they
should be collected and correctly disposed
of, with respect to the environment. Brake fluid
Top up br
ak

e fluid Read the additional information carefully
› ›
›

 page 61
Checking the brake fluid level
The brake fluid level must be between the
MIN and MAX markings.
However, if the brake fluid level goes down
noticeably in a short time, or drops below the
MIN mark, there may be a leak in the brake
system. Seek specialist assistance. A warn-
ing light on the instrument panel display
monitors the brake fluid level ››› page 119. »
275
Technical data
Advice
Operation
Emergencies
Safety

Checking and refilling levels
CAUTION
● Do not mi x
cleaning products recommen-
ded by SEAT with other products. This could
lead to flocculation and may block the wind-
screen washer jets.
● When topping up service fluids, make abso-
lutely c
ertain that you fill the fluids into the
correct reservoirs. Using the wrong fluids
could cause serious malfunctions and engine
damage!
● Not having windscreen wiper fluid reduces
vis
ibility through the windscreen, and leads
to loss of visibility in headlights in models
with headlight washer. Battery
Gener a
l

informationRead the additional information carefully
› ›
›

 page 61.
The battery is located in the engine compart-
ment and is almost maintenance-free. It is
checked as part of the Inspection Service.
Nevertheless, check the terminals are clean
and have the correct tightening torque, espe-
cially in summer and winter.
Disconnecting the battery
The battery should only be disconnected in
exceptional cases. When the battery is dis- connected, some of the vehicle's functions
are “los

t” (››› table on page 277). These
functions will require resetting after the bat-
tery is reconnected.
Deactivate the anti-theft alarm* before you
disconnect the battery Otherwise the alarm
will be triggered.
FunctionReprogramming
One-touch function of
the electric windows››› page 138, One-touch
opening and closing*.
Remote control key
If the vehicle does not re-
spond to the key, they
should be synchronised
››› page 132.
Digital clock››› page 116.
ESC warning lampAfter driving for a few me-
tres, the warning lamp goes
out again. If the vehicle is not used for long periods
The
v
ehic

le has a system for monitoring the
current consumption when the engine is left
unused for long periods of time ››› page 201.
Some functions, such as the interior lights, or
the remote door opening, may be temporarily
disabled to prevent the battery from running
flat. These functions will come back on as
soon as the ignition is switched on and the
engine started. Winter conditions
During the w

inter, the starting power may be
reduced, and if necessary, the battery should
be charged ››› in Important safety warn-
in g
s

for handling a vehicle battery on
page 278
Important safety warnings for han-
dling a v
ehicle battery All work on batteries requires specialist
kno
wl
edg

e. Please refer to a SEAT Official
Service or a workshop specialising in batter-
ies: risk of burns or exploding battery!
The battery must not be opened. Never try to
change the fluid level of the battery. Other-
wise explosive gas is released from the bat-
tery that could cause an explosion. 
Wear eye protection.

Battery acid is very corrosive and caustic. Wear
protective gloves and eye protection. In the event
of electrolyte splashes, rinse off with plenty of
water.

Fires, sparks, open flames and smoking are pro-
hibited.

The battery should only be charged in a well-ven-
tilated zone. Risk of explosion!

Keep children away from acid and batteries!»
277
Technical data
Advice
Operation
Emergencies
Safety

Wheels
CAUTION
● Some v ehic
les, for example those with the
Start-Stop system* are fitted with a special
battery (AGM-type or EFB-type battery). If any
other type of battery is fitted, the Start-Stop
function may be considerably reduced and
the vehicle may not stop on repeated occa-
sions.
● Make sure that the vent hose is always at-
tached t
o the original opening on the side of
the battery. Gases or battery acid can other-
wise escape and possibly cause damage.
● The battery holder and clamps must always
be correctly
secured.
● Before starting any work on the battery, al-
way
s observe the warnings listed under
››› page 277, Important safety warnings for
handling a vehicle battery .
● Do not forget to replace the battery cover-
ings, wher
e applicable. It is a protection for
high temperatures. This in turn extends the
vehicle service life. For the sake of the environment
 Batteries contain toxic substances includ-
in g s

ulphuric acid and lead. They must be
disposed of appropriately and must not be
disposed of with ordinary household waste.
Make sure disconnected batteries cannot tip
over. Sulphuric acid could be spilt! Wheels
Wheel s
and ty

res
General notes –
When driving with new tyr e
s, be especially
careful during the first 500 km (300 miles).
– If you have to drive over a kerb or similar
obs

tacle, drive very slowly and as near as
possible at a right angle to the obstacle.
– Check from time to time if the tyres are
dam ag

ed (punctures, cuts, cracks or
dents). Remove any foreign objects embed-
ded in the treads.
– Damaged wheels and tyres must be re-
plac

ed immediately.
– Keep grease, oil and fuel off the tyres.
– Replace any missing valve caps as soon as
poss

ible.
– Mark the wheels before taking them off so
that they

rotate in the same direction when
put back.
– When removed, the wheels or tyres should
be stor

ed in a cool, dry and preferably dark
place.
New tyres
New tyres do not give maximum grip straight
away and should therefore be “run in” by driving carefully and at moderate speeds for
about the firs

t 500 km (300 miles). This will
also increase the useful life of the tyres.
The tread depth of new tyres may vary, ac-
cording to the type and make of tyre and the
tread pattern.
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. Inspect the
tyres for damage. If no external damage is
visible, drive slowly and carefully to the near-
est specialised workshop and have the car
inspected.
Tyres with directional tread pattern
An arrow on the tyre sidewall indicates the di-
rection of rotation on single drive tyres. Al-
ways note the direction of rotation indicated
when mounting the wheel. This guarantees
optimum grip and helps to avoid aquaplan-
ing, excessive noise and wear.
Retrofitting accessories
If you wish to change or fit wheels, rims or
wheel trims, we recommend that you consult
with a SEAT Official Service centre for advice
regarding current techniques.
279
Technical data
Advice
Operation
Emergencies
Safety

Wheels
WARNING
● Alw a
ys adapt the tyre pressure accordingly
when the vehicle load changes.
● A tyre with low air pressure has to flex a lot
more when the v
ehicle is heavily loaded or at
high speeds, therefore causing overheating
to occur. Under these conditions, the tyre
bead may be released or the tyre may burst.
Risk of accident! For the sake of the environment
Under-inflated tyres will increase fuel con-
sumption. Wear indicators
Fig. 251
Tyre tread: tread wear indicators Tread wear indicators indicate if a tyre is
w
orn. The origin
al
tyres on your vehicle have
1.6 mm high “trea
d wear indicators” running
across the tread. Depending on the manufac-
turer, there will be 6 to 8 of them spaced at
equal distances around the tyre. Markings on
the tyre sidewall (for instance the letters
“TWI” or a triangle) indicate the positions of
the tread wear indicators.
The minimum tread depth required by law is
1.6 mm (measured in the tread grooves next
to the tread wear indicators). (Different fig-
ures may apply in other countries.) WARNING
The tyres must be replaced at the latest when
the tre a

d is worn down to the tread wear indi-
cators. Failure to follow this instruction could
result in an accident.
● Especially in difficult driving conditions
such a
s wet or icy roads. It is important that
the tyre tread be as deep as possible and be
approximately the same on the tyres of both
the front and the rear axles.
● The scant driving safety due to insufficient
trea
d depth is particularly evident in vehicle
handling, when there is a risk of “aquaplan-
ing” in deep puddles of water and when driv-
ing through corners, and braking is also ad-
versely affected.
● The speed has to be adapted accordingly,
otherwi
se there is a risk of losing control over
the vehicle. Interchanging tyres
Fig. 252
Interchanging tyres. To ensure that the wear is equal on all tyres
the wheel
s
shou

ld be changed round from
time to time according to the system
››› Fig. 252. The useful life of all the tyres will
then be about the same time.
New tyres or new wheels –
All four wheels must be fitted with tyres of
the s ame type, s
iz

e (rolling circumference)
and preferably the same tread pattern.
– Tyres should be replaced at least in pairs
and not individual

ly (i.e. both front tyres or
both rear tyres together).
– Do not use tyres whose effective size ex-
ceeds

the dimensions of the factory-ap-
proved makes of tyre. »
281
Technical data
Advice
Operation
Emergencies
Safety

Wheels
●
Av oid ru
nning the vehicle on tyres that are
more than 6 years old. If you have no
alternative, you should drive slowly and with
extra care at all times.
● If wheel trims are fitted after the car is pur-
cha
sed, ensure that there is an adequate flow
of air for cooling the brake system. For the sake of the environment
Old tyres must be disposed of according to
the l aw

s in the country concerned. Note
● A S EA

T Service Centre should be consulted
to find out whether wheels or tyres of differ-
ent sizes to those originally fitted by SEAT
can be fitted, and to find out about the com-
binations allowed between the front axle
(axle 1) and the rear axle (axle 2).
● Never mount used tyres if you are not sure
of their “pr
evious history”.
● For technical reasons, it is not generally
poss
ible to use the wheels from other vehi-
cles. In some cases, this may also be true for
the same model of wheel. Wheel bolts
The wheel
bolts
ar
e m
atched to the rims.
When installing different wheels (for instance
alloy wheels or wheels with winter tyres) it is
important to use the correct wheel bolts with the right length and correctly shaped bolt
head

s. This ensures that wheels are fitted se-
curely and that the brake system functions
correctly.
The wheel bolts must be clean and turn easi-
ly.
A special adapter is required to turn the anti-
theft wheel bolts* ›››
 page 67.
Tyre monitoring systems Introduction WARNING
Unsuitable handling of the wheels and tyres
ma y

lead to sudden tyre pressure losses, to
tread separation or even to a blow-out.
● Check tyre pressures regularly and ensure
they are m
aintained at the pressures indica-
ted. Tyre pressure that is too low could cause
overheating, resulting in tread detachment or
even burst tyres.
● Tyre pressure should be that indicated on
the label when the ty
res are cold at all times
››› page 291.
● Regularly check the cold inflation pressure
of the tyr
es. If necessary, change the tyre
pressure of the vehicle tyres while they are
cold. ●
Re gu

larly check your tyres for damage and
wear.
● Never exceed the maximum permitted
speed or loa
ds specified for the type of tyre
fitted on your vehicle. For the sake of the environment
Under-inflated tyres lead to increased fuel
c on s

umption and tyre wear. Note
● Driv ing f

or the first time with new tyres at a
high speed can cause them to slightly ex-
pand, which could then produce an air pres-
sure warning.
● Only replace used tyres with those author-
ised by
SEAT for the corresponding type vehi-
cle.
● Do not only rely on the tyre monitoring sys-
tem. Re
gularly check your tyres to ensure
that the tyre pressure is correct and that the
tyres are not damaged due to puncture, cuts,
tears and impacts/dents. Remove objects
from the tyres only when they have not
pierced the tyres. 283
Technical data
Advice
Operation
Emergencies
Safety

Wheels
Tyre monitoring indicator Fig. 253
Instrument panel: warning of loss of
ty r
e pr
essure. The tyre monitor indicator compares wheel
r
ev
o

lutions and, with this information, the
tread of each wheel using the ABS sensors. If
the rolling circumference of one or more
wheels has changed, the tyre monitoring in-
dicator will indicate this on the instrument
panel through a warning lamp and a warning
to the driver ››› Fig. 253. When only one spe-
cific tyre is affected, its position within the
vehicle will be indicated.
 Loss of pressure: Check left
tyre pressure!
Wheel tread change
The wheel tread changes when: ●
Tyr
e pressure is manually changed
● Tyre pressure is insufficient
● Tyre structure is damaged
● The vehicle is unbalanced because of a
load
● The wheel

s on an axle are subject to a
heavier lo
ad (e.g. with a heavy load).
● The vehicle is fitted with snow chains
● The temporary spare wheel is fitted
● The wheel on one axle is changed
There ma
y be a delay in the reaction of the
tyre  monitoring indicator or it may not in-
dicate anything under certain circumstances
(e.g. sporty driving, snow-covered or un-
paved roads, or when driving with snow
chains). Calibrating the tyre monitoring indica-
tor Fig. 254
Glove compartment: tyre control
sw it
c

h. After changing the tyre pressure or replacing
one or mor
e wheel
s, the ty

re monitoring indi-
cator must be recalibrated. Do the same, for
example, when the front and rear wheels are
swapped.
● Switch the ignition on.
● Store the new tyre pressure in the Easy
Connect sy
stem with the  button and the
f u
nction b
utton Setup
› ›
›
 page 33 or us-
ing the switch located in the glove compart-
ment 1)
››› Fig. 254.
● In vehicles without radio : pres
s and hold
down the   button with the ignition on,
until an acoustic signal is heard. »1)
In vehicles without the Infotainment system:
285
Technical data
Advice
Operation
Emergencies
Safety

Wheels
Extraction of the spare wheel in vehi-
c l
e
s with SEAT SOUND 10 speakers
(with subwoofer)* Fig. 256
In the luggage compartment: re-
mo v
e the s

ubwoofer. To remove the spare wheel, you must first re-
mo
v
e the

subwoofer.
– Disassemble the subwoofer's
floor panel
(carpet) as follows:
– LEON/LEON SC model: first, p
ull the carpet
in the direction of the backrest and then
pull it upwards to remove it. LEON ST mod-
el: lift and secure the floor storage com-
partment as explained in ››› page 170.
– Disconnect the subwoofer’s
speaker cable
››› Fig. 256 1 . –
Turn the sec urin

g wheel anti-clockwise 2 .
– Remove the s ub
woofer
speaker and the
spare wheel.
– When re-mounting the spare tyre, place the
subwoofer

on the base of the wheel rim
with care. When doing so, the tip of the
“FRONT” arrow on the subwoofer should
point forward.
– Reconnect the speaker cable and firmly ro-
tate the sec

uring wheel clockwise so that
the subwoofer system and wheel are firmly
in place.
Winter service Winter ty
res –
Winter tyres must be fitted on al
l
four
wheels.
– Only use winter tyres that are approved for
your v

ehicle.
– Please note that the maximum permissible
speed for w

inter tyres may be lower than
for summer tyres.
– Also note that winter tyres are no longer ef-
fective when the

tread is worn down. –
After fittin
g the wheels you must always
check the tyre pressures. When doing so,
take into account the correct tyre pressures
listed on the rear of the front left door
frame ››› page 280.
In winter road conditions winter tyres will
considerably improve vehicle handling. The
design of summer tyres (width, rubber com-
pound, tread pattern) gives less grip on ice
and snow. This applies particularly to vehi-
cles equipped with wide section tyres or with
high speed tyres (code letters H, V or Y on
the sidewall).
Only use winter tyres of the correct type ap-
proved for your vehicle. The sizes of these
tyres are specified in the vehicle's docu-
ments (e.g. EC Certificate of Conformity or
COC 1)
). The vehicle documentation varies de-
pending on the country of residence. See al-
so ››› page 281.
Winter tyres lose a great deal of their proper-
ties when the tread is worn down to a depth
of 4 mm.
The performance of winter tyres is also se-
verely impaired by ageing, even if the tread is
still much deeper than 4 mm.
Winter tyres are subject to the following max-
imum speed limits according to speed rating
code letter: ››› »
1)
COC = certificate of conformity.
287
Technical data
Advice
Operation
Emergencies
Safety