2017 Seat Leon SC check engine

Emergencies
If you choose to change the engine compart-
ment l
amp
s yourself, remember that it is a
dangerous area ››› in Working in the en-
gine c omp
ar

tment on page 270.
Always use identical bulbs with the same
designation. The name can be found on the
base of the bulb holder.
Depending on how equipped the vehicle is,
there are different sets of headlights and tail
lights:
● Halogen headlights.
● Full-LED main headlights*
● Halogen headlights with LED daytime run-
ning lights*
● Re

ar bulb light
● LED rear light*
Ful
l-LED headlight system*
Full-LED headlights handle all light functions
(daylight, side light, turn signal, dipped
beam and route light) with light emitting di-
odes (LEDs) as a light source.
Full-LED headlights are designed to last the
lifetime of the car and light bulbs cannot be
replaced. In case of headlight failure, go to
an authorised workshop to have it replaced. WARNING
● Tak e p

articular care when working on com-
ponents in the engine compartment if the en-
gine is warm. Risk of burns.
● Bulbs are highly sensitive to pressure. The
glas
s can break when you touch the bulb,
causing injury.
● When changing bulbs, please take care not
to injure
yourself on sharp edges, in particu-
lar on the headlight housing. CAUTION
● Remo v

e the ignition key before working on
the electric system. Otherwise, a short circuit
could occur.
● Switch off the lights and the parking light
before c
hanging a bulb.
● Take good care to avoid damaging any com-
ponents. For the sake of the environment
Please ask your specialist retailer how to dis-
pose of u

sed bulbs in the proper manner. Note
● Ple a

se check at regular intervals that all
lighting (especially the exterior lighting) on
your vehicle is functioning properly. This is
not only in the interest of your own safety,
but also that of all other road users. ●
Bef or

e changing a bulb, make sure you
have the correct new bulb.
● Do not touch the glass part of the bulb with
your bar
e hands, use a cloth or paper towel
instead, since the fingerprints left on the
glass will vaporise as a result of the heat gen-
erated by the bulb, they will be deposited on
the reflector and will impair its surface.
● Depending on the level of equipment fitted
in the vehic
le, LEDs may be used for part or
all of the interior and/or exterior lighting.
LEDs have an estimated life that exceeds than
that of the car. If an LED light fails, go to an
authorised workshop for its replacement. 104

Transport and practical equipment
● The r e
ar shelf
can be stored under the lug-
gage compartment variable floor when the
latter is in the top position (except for vehi-
cles equipped with natural gas engine CNG)
››› page 164.
Fitting the rear shelf
● Place the rear shelf in the housing provided
in the left
side cover.
● Engage the support of the rear shelf
›››
Fig. 166 1 in the right housing.
● Check that the support ››
›
Fig. 166 1 is
pr operly
en
gaged. WARNING
Animals, loose or unsecured or objects car-
ried on the re ar shelf

can cause serious injury
in case of sudden manoeuvring or braking or
in case of an accident.
● Do not leave hard, sharp or heavy objects
or in bags
on the rear shelf.
● Never carry animals on the rear shelf. CAUTION
To retract the rear shelf, press on its handle
in a down w

ards only direction; if you press it
upwards it may lead to its axles breaking. Storing the rear shelf
3 Applies to the model: LEON/LEON SC
Fig. 167
In the luggage compartment: covers
f or s
t

oring the rear shelf. Fig. 168
In the luggage compartment: fitting
the s t
or

age compartment shelf. The rear shelf can be stored under the lug-
g
ag
e c

ompartment variable floor.
● Remove the left and right covers
›››
Fig. 167. ●
Pres
s the rear shelf until it engages in its
housing ››› Fig. 168.
● Put the left and right covers in their original
position.
163
Technical data
Advice
Operation
Emergencies
Safety

Air conditioning
Distributing a load
Di s
trib
ute loads uniformly and secure them
correctly ››› .
Chec k
att

achments
Once the cross bars and roof carrier system
have been installed, check the bolted con-
nections and attachments after a short jour-
ney and subsequently with a certain frequen-
cy. WARNING
Exceeding the maximum authorised roof load
can r e

sult in accidents and considerable vehi-
cle damage.
● Never exceed the maximum authorised
load on the r
oof and on the axles or the vehi-
cle's maximum authorised weight.
● Never exceed the load capacity of the cross
bars
and the roof carrier system, even if the
maximum authorised roof load has not been
reached.
● Secure heavy items as far forward as possi-
ble and di
stribute the vehicle load uniformly. WARNING
If the load is loose or not secured, it could fall
from the r oof

carrier system or cause acci-
dents and injuries.
● Always use belts or retaining straps that
are suit
able and in a good condition.
● Secure the load properly. Air conditioning
He atin
g,

ventilation and cool-
ing
Introduction Read the additional information carefully
›› ›

 page 52
Viewing Climatronic information
On the screen of Climatronic control unit and
on the screen of the factory-fitted Easy Con-
nect system, the theoretical values of the
temperature zones are shown.
The unit of temperature measurement can be
changed in the Easy Connect system.
Dust and pollen filter
The dust and pollen filter with its activated
charcoal cartridge serves as a barrier against
impurities in the air taken into the vehicle in-
terior.
The dust and pollen filter must be changed
regularly so that air conditioner performance
is not adversely affected.
If the filter loses efficiency prematurely due
to use in areas with very high levels of air
pollution, the filter must be changed more
frequently than stated in the Service Sched-
ule. WARNING
Reduced visibility through the windows in-
cr e

ases the risk of serious accidents.
● Always ensure that all windows are free of
ice and sno
w, and that they are not fogged,
so as to maintain good visibility of everything
outside.
● The maximum heat output required to de-
fros
t windows as quickly as possible is only
available when the engine has reached its
normal running temperature. Only drive when
you have good visibility.
● Always ensure that you use the heating
syst
em, fresh air system, air conditioner and
the heated rear window to maintain good visi-
bility to the outside.
● Never leave the air recirculation on for a
long period of time. If
the cooling system is
switched off and air recirculation mode
switched on, the windows can mist over very
quickly, considerably limiting visibility.
● Switch air recirculation mode off when it is
not requir
ed. WARNING
Stuffy or used air will increase fatigue and re-
duce driv er c

oncentration possibly resulting
in a serious accident.
● Never leave the fresh air fan turned off or
use the air rec
irculation for long periods of
time; the air in the vehicle interior will not be
refreshed. » 173
Technical data
Advice
Operation
Emergencies
Safety

Operation
CAUTION
● Switc h the air c
onditioner off if you think it
may be broken. This will avoid additional
damage. Have the air conditioner checked by
a specialised workshop.
● Repairs to the air conditioner require spe-
ciali
st knowledge and special tools. SEAT rec-
ommends visiting a SEAT Official Service. Note
● When the coolin g sy

stem is turned off, air
coming from the outside will not be dried. To
prevent fogging of the windows, SEAT recom-
mends leaving the cooling system (compres-
sor) turned on. To do this, press the  but-
ton. The button lamp should light up.
● The maximum heat output required to de-
frost
windows as quickly as possible is only
available when the engine has reached its
normal running temperature.
● Keep the air intake slots in front of the
windsc
reen free of snow, ice and leaves to en-
sure heating and cooling are not impaired,
and to prevent the windows from misting
over. Operating the Climatronic through the
E
a
sy C

onnect* system 3 Applies to vehicles with a Media System
Touc h/C

olour.
In the Easy Connect system it is also possible
to perform various adjustments to the Clima-
tronic.
Open the air conditioner menu
● Press the  button on the Climatronic
contro l

panel.
● OR: press the  button in Easy Connect.
W ith the r
otatin

g switch select the air con-
ditioner menu and open it.
On the touch screen you can see and change
the current settings, for example, the temper-
ature set for the driver and passenger sides,
the air distribution and the fan speed.
To switch a function on or off, or to select a
submenu, you must press the corresponding
function button.
Function button: function
OFFSwitch off and switch on the Climatron-
ic.
SYNCSynchronise driver and front passenger
temperatures.
Function button: function
SETTINGS
The air conditioning settings submenu
is opened. The following settings can al-
so be adjusted:
Air conditioning profile. : Ad-
just the power of the fan in AUTO mode.
You can choose between low, medium
and high.
Automatic air recirculation :
Switching automatic air recirculation on
and off ››› page 176.
BACK : Close the submenu. Operating the Climatronic through the
E
a
sy C

onnect* system 3
Applie
s
to vehicles with Media System Plus/Navi
System/Navi System Plus. Fig. 189
Easy Connect screen: air conditioner
menu. 174

Air conditioning
In the Easy Connect system it is also possible
t o per
form
various adjustments to the Clima-
tronic ››› Fig. 189.
Open the air conditioner menu
● Press the  button on the Climatronic
c ontr
ol

panel.
On the top of the screen you can see and
change the current settings, such as, for ex-
ample, the temperature set for the driver side
and for that of passenger. Temperatures up
to +22°C (+72°F) are shown with blue arrows,
and temperatures over +22°C (+72°F) with
red arrows.
To switch a function on or off, or to select a
submenu, you must press the corresponding
function button.
Function button: function
OFFClimatronic is switched off.
ONClimatronic is switched on.
SYNCSynchronise driver and front passenger
temperatures.
Function button: function
SETTINGS
The air conditioning settings submenu
is opened. The following settings can al-
so be adjusted:
Air conditioning profile. : Ad-
just the power of the fan in AUTO mode.
You can choose between low, medium
and high.
Automatic air recirculation :
Switching automatic air recirculation on
and off ››› page 176.
Automatic supplementary heat-
er : Activate/deactivate the automatic
activation of the auxiliary heater for
colder countries (only for engines with
auxiliary heater). With the option deacti-
vated, depending on the outside tem-
perature the heating may need more
time than normal to reach a comfortable
temperature.
BACK : Close the submenu. Air conditioning user instructions
The interior cooling system only works when
the en
gine i
s ru

nning and fan is switched on.
The air conditioner operates most effectively
with the windows and the panoramic sliding
sunroof closed. However, if the vehicle has
heated up after standing in the sun for some
time, the air inside can be cooled more quick- ly by opening the windows and the panoram-
ic sliding s

unroof briefly.
Climatronic: change the temperature unit on
the screen of the radio or on the factory-fit-
ted navigation system
Changing the temperature display from Cel-
sius to Fahrenheit on radio or on the factory-
fitted navigation system is done using the
menu on the instrument panel
›››  page 36.
The cooling system cannot be activated
If the air conditioning system cannot be
switched on, this may be caused by the fol-
lowing:
● The engine is not running.
● The fan is switched off.
● The air conditioner fuse has blown.
● The outside temperature is lower than ap-
proxim
ately +3°C (+38°F).
● The air conditioner compressor has been
temporarily
switched off because the engine
coolant temperature is too high.
● Another fault in the vehicle. Have the air
conditioner check
ed by a specialised work-
shop.
Special Characteristics
If the humidity and temperature outside the
vehicle are high, condensation can drip off »
175
Technical data
Advice
Operation
Emergencies
Safety

Driving
(2.5 miles), when fuel consumption will re-
t urn t
o a norm
al level.
Check tyre pressure
Always make sure the tyres are inflated to the
correct pressures ››› page 280 to save fuel. If
the pressure is below half bar, fuel consump-
tion may increase by 5%. Due to the greater
rolling resistance, under-inflation also increa-
ses tyre wear and impairs handling.
Do not use winter tyres all year round as they
increase fuel consumption by up to 10%.
Avoid carrying unnecessary loads
Given that every kilo of extra weight will in-
crease the fuel consumption, it is advisable
to always check the luggage compartment to
make sure that no unnecessary loads are be-
ing transported.
Since the luggage rack increases the aerody-
namic drag of the vehicle, you should remove
it when not needed. At speeds of 100-120
km/h (62-75 mph), this will save 12% of fuel.
Save electrical energy
The engine drives the alternator, thereby gen-
erating electricity. This implies that any in-
crease in power consumption also increases
fuel consumption! For this reason, switch off
any unneeded electrical devices. Devices that
use a lot of electricity includes the blower at a high setting, the rear window heating or
the seat he
ating*.
Power management This sy
stem helps to ensure reliable
starting The power management controls the distribu-
tion of el
ectric

al energy and thus helps to en-
sure that there is always enough power avail-
able to start the engine.
If a vehicle with a conventional electrical sys-
tem is left parked for a long time, the battery
will gradually lose its charge because certain
electrical devices, such as the electronic
gearbox lock continues to draw current even
when the ignition is off. In some cases there
may not be enough power available to start
the engine.
Your vehicle is equipped with an intelligent
power management system to control the
distribution of electrical energy. This signifi-
cantly improves reliability when starting the
engine, and also prolongs the useful life of
the battery.
The main functions incorporated in the power
management system are battery diagnosis,
residual current management and dynamic
power management. Battery diagnosis
The batt
er

y diagnosis function constantly
registers the condition of the battery. Sen-
sors detect the battery voltage, battery cur-
rent and battery temperature. This enables
the system to calculate the current power lev-
el and charge condition of the battery.
Residual current management
The residual current management reduces
power consumption while the vehicle is
parked. It controls the supply of power to the
various electrical devices while the ignition is
switched off. The system takes the battery di-
agnosis data into consideration.
Depending on the power level of the battery,
switch off the individual electrical devices
one after the other to prevent the battery
from losing too much charge and to ensure
that the engine can be started reliably.
Dynamic power management
While the vehicle is moving, this function dis-
tributes the available power to the various
electrical devices and systems according to
their requirements. The power management
ensures that on-board systems do not con-
sume more electrical power than the alterna-
tor can supply, and thus maintains the maxi-
mum possible battery power level. »
201
Technical data
Advice
Operation
Emergencies
Safety

Driving
●
Do not ap p
ly wax underneath the vehicle
around the area of the exhaust system: Fire
hazard! Note
While the control lamps , ,  or  r
e-
m ain lit, ther

e may be engine problems, fuel
consumption may increase and the engine
may lose power. Catalytic converter
3 App
lies to vehicles with petrol engine
The
vehicle must only be used with unleaded
petrol, otherwise the catalytic converter will
be irreparably damaged.
Never drive until the tank is empty; an irregu-
lar supply of fuel can cause faulty combus-
tion. In these cases, unburned fuel reaches
the exhaust system, which can overheat and
damage the catalytic converter.
Diesel particulate filter 3 App
lies to vehicles with diesel engine
The die
sel engine particulate filter eliminates
most of the soot from the exhaust gas sys-
tem. Under normal driving conditions, the fil-
ter cleans itself. The diesel particulate filter is
cleaned automatically without need for indi-
cation by the warning lamp . This may benoticed because the engine idle speed in-
cr
e

ases and an odour may be detected.
If automatic filter purification cannot be car-
ried out (because only short trips are taken,
for example), soot will accumulate on the fil-
ter and the Diesel particulate filter warning
lamp will  switch on.
Facilitate the automatic filter cleaning proc-
ess by driving in the following manner: drive
for approximately 15 minutes at a minimum
speed of 60 km/h (37 mph) in 4th or 5th gear
(automatic gearbox: gear S). Maintain the en-
gine speed at approximately 2,000 rpm. The
rise in temperature causes the soot on the fil-
ter to burn. On completion of the cleaning
the warning lamp will switch off. If the warn-
ing lamp does not switch off, go immediately
to a specialised workshop to rectify the prob-
lem.
Engine management*  This warning lamp monitors the engine man-
ag
ement
sy

stem for petrol engines.
The warning lamp  (Electronic Power Con-
trol) lights up when the ignition is switched
on while system operation is being verified. It
should go out once the engine is started.
If there is a fault in the electronic engine
management system while you are driving,
this warning lamp will light up. Take the vehi- cle to a specialised workshop as soon as
poss

ible and have the engine checked.
Emission control system*  Control lamp
 flashe
s:
When there is misfiring that can damage the
catalytic converter. Reduce speed and drive
carefully to the nearest specialised workshop
to have the engine checked.
The control lamp  lights up:
If a fault has developed during driving which
has reduced the quality of the exhaust gas
(e.g. lambda probe fault). Reduce speed and
drive carefully to the nearest specialised
workshop to have the engine checked.
Engine pre-heating/fault system*  The warning lamp lights up to show that the
glo
w p
lug

s are preheating the diesel engine.
The control lamp  lights up
If the control lamp  lights up when the en-
gine is started it means that the glow plugs
are preheating. The engine can be started
straight away when the lamp switches off. »
203
Technical data
Advice
Operation
Emergencies
Safety

Operation
Control lamp  fla
she s
If a fault develops in the engine management
system while you are driving, the glow plug
system lamp will flash . Take the vehicle to
a specialised workshop as soon as possible
and have the engine checked.
Driving tips
Driving thr
ough flooded roadsTo prevent damage to the vehicle when driv-
in
g thr
ough w

ater, for example, along a floo-
ded road, please observe the following:
● The water should never come above the
lower edg
e of the bodywork.
● Drive at pedestrian speed. WARNING
After driving through water, mud, sludge,
etc ., the br

aking effect can be delayed slight-
ly due to moisture build-up on the discs and
brake pads. Applying the brakes carefully
several times will remove the moisture and
restore the full braking effect. CAUTION
● Drivin g thr

ough flooded areas may severely
damage vehicle components such as the en- gine, transmission, running gear or electrical
sys
t

em.
● Whenever driving through water, the Start-
Stop sys
tem* must be switched off
››› page 205. Note
● Chec k the depth of

the water before enter-
ing the flooded zone.
● Do not stop in the water, drive in reverse, or
stop the en
gine in any situation.
● Note that vehicles travelling in the opposite
direction ma
y splash water that could exceed
the maximum permitted water height for your
vehicle.
● Avoid driving through salt water (corro-
sion). Four-wheel drive
3 V
alid for vehicles: with four-wheel drive
On f
our-wheel drive models, the engine pow-
er is distributed to all four wheels
General notes
On four-wheel drive vehicles, the engine
power is distributed to all four wheels. The
distribution of power is controlled automati-
cally according to your driving style and the
road conditions. Also see ››› page 187, Brak-
ing and stability systems .The four-wheel drive is specially designed to
comp
l

ement the superior engine power. This
combination gives the vehicle exceptional
handling and performance capabilities, both
on normal roads and in more difficult condi-
tions, such as snow and ice. Even so (or per-
haps especially for this reason), it is impor-
tant to observe certain safety points ››› .
W int
er ty

res
Thanks to four-wheel drive, your vehicle will
have plenty of traction in winter conditions,
even with the standard tyres. Nevertheless,
we still recommend that winter tyres or all-
season tyres be fitted on all four wheels to
give even better braking response.
Snow chains
On roads where snow chains are mandatory,
this also applies to cars with four-wheel drive
›››  page 69.
Changing tyres
On vehicles with four-wheel drive, all four
tyres must have the same rolling circumfer-
ence. Also avoid using tyres with varying
tread depths ››› page 281.
Off-roader?
Your SEAT is not an off-road vehicle: it does
not have enough ground clearance to be
used as such. It is therefore best to avoid
204