2016 Seat Leon 5D ECU

Operation
Standby position Fig. 228
Standby position: Position of the lev-
er and the r el
e
ase bolt Standby position adjusted properly
● Key A
› ›
› Fig. 228
is in the released posi-
tion (the part of the key with the holes is fac-
ing upwards).
● Lever B
› ›
› Fig. 228
is in the bottom posi-
tion.
● The release bolt C
› ›
› Fig. 228
can be
moved. Thus adjusted, the detachable ball is ready
for ins

tallation. CAUTION
The key cannot be removed or turned in the
st andb

y position. Assembling the detachable ball - Step
1
Fig. 229
Fitting the detachable ball / Release
bo lt
in the dep

loyed position Fitting the detachable ball
●
Remove the hook housing cap 4 ›››
Fig. 225 down w
ards.
● Set the detachable ball to its standby posi-
tion ›››

page 235.
● Grip the detachable ball from below
›

›› Fig. 229 and insert it into the hook hous- ing following the direction of arrow
1 until it
en g
ag

es audibly ››› .
L ev
er A turns
automatically in the direction
of arr

ow 2 upwards, and the release bolt
B moves outwards (the red and green part will
be
v
i

sible) ››› .
If l
ev
er A does not turn automatically or the
r el
e

ase bolt B does not come out, the de-
t ac
h
able ball should be removed by turning
the lever as far as possible downwards from
the housing cavity, and the detachable ball's
support surfaces and the cavity should then
be cleaned. WARNING
● When attac hin

g the detachable ball, keep
your hands well away from the reach of the
lever's rotation. There is a risk of injuring
your fingers!
● Never try to pull the lever upwards by force
to turn the k
ey. The detachable ball would not
be secured properly! 236

Towing bracket device
Assembling the detachable ball - Step
2 Fig. 230
Locking the lock Fig. 231
Placing the cover over the lock. Do not omit this first step
››
› page 236, As-
sembling the detachable ball - Step 1 !
● Turn key A in the direction of arrow
1 un-
ti l the p

art of the key with the holes reaches
the bottom position ››› Fig. 230. ●
Remov
e the key in the direction of arrow
2 .
● Place cover B in the lock in the direction
of arr
o

w 3
› ››
Fig. 231
››› .
● Check that the detachable ball is secure
› ›
›

page 237. CAUTION
● Aft er r

emoving the key, always place the
cover over the lever's lock. If the lock be-
comes soiled it will be impossible to insert
the key.
● Keep the towing bracket device's housing
cavity
clean at all times. Dirtiness can pre-
vent the detachable ball from being properly
secured!
● If the detachable ball is removed, always
plac
e the cap on the hook's housing. Checking proper attachment
Fig. 232
Detachable ball properly attached Whenever you go to use the detachable ball,
m
ak
e s

ure that it is properly attached first.
Detachable ball properly attached
● The detachable ball will not fall out of the
housin
g cavity after a major “knock or jerk”.
● Lever A
› ›
› Fig. 232
is fully raised.
● The release bolt B
› ›
› Fig. 232
is sticking
fully out (the red and green part is visible).
● The key has been removed.
● Cover C
› ›
› Fig. 232
is placed over the lock. WARNING
The towing bracket device should only be
used if the det

achable ball has been properly
locked! 237
Technical data
Advice
Operation
Emergencies
Safety

Towing bracket device
●
When operatin g the l
ever, do not apply too
much pressure (for example, do not stand on
it)! Note
Remove any dirt from the detachable ball be-
f or e

you put it away with the vehicle tools. Operation and care
Put the cover on the housing cavity so that
dir
t
c

annot get in.
Before hooking up a trailer, always check the
ball coupling and apply suitable grease if
necessary.
Use the protective cover when putting the de-
tachable ball away to keep the luggage com-
partment clean.
Remove any dirt from the housing cavity sur-
faces and use a suitable cleaning product. CAUTION
The top part of the hook housing is greased.
Mak e s

ure that the grease has not been re-
moved. Trailer towing
Wh at
do

you need to bear in mind
when towing a trailer? Your vehicle may be used to tow a trailer
when fitted w
ith the c

orrect equipment.
If you wish to retrofit a towing bracket, con-
sult ››› page 243.
Connectors
Your vehicle is fitted with a 13-pin connector
for the electrical connection between the
trailer and the vehicle.
If the trailer has a 7-pin plug you will need to
use an adapter cable. It is available at any
Technical Service.
Trailer weight/drawbar load
Never exceed the authorised trailer weight. If
you do not load the trailer up to the maxi-
mum permitted trailer weight, you can then
climb correspondingly steeper slopes.
The maximum trailer weights listed are only
applicable for altitudes up to 1000 m above
sea level. With increasing altitude the engine
power and therefore the vehicle climbing
ability are impaired because of the reduced
air density. The maximum trailer weight has
to be reduced accordingly. The weight of the
vehicle and trailer combination must be re- duced by 10% for every further 1000 m (or
par
t

thereof). The gross combination weight
is the actual weight of the laden vehicle plus
the actual weight of the laden trailer. When
possible, operate the trailer with the maxi-
mum permitted drawbar load on the ball joint
of the towing bracket, but do not exceed the
specified limit.
The figures for trailer weights and drawbar
loads that are given on the data plate of the
towing bracket are for certification purposes
only. The correct figures for your specific
model, which may be lower than these fig-
ures for the towing bracket, are given in the
vehicle documentation or in ››› chapter Tech-
nical Data .
Distributing the load
Distribute loads in the trailer so that heavy
objects are as near to the axle as possible.
Loads carried in the trailer must be secured
to prevent them moving.
Tyre pressure
Set tyre pressure to the maximum permissi-
ble pressure shown on the sticker on the in-
side of the fuel tank flap. Set the tyre pres-
sure of the trailer tyres in accordance with the
trailer manufacturer's recommendations. »
239
Technical data
Advice
Operation
Emergencies
Safety

Towing bracket device
Trailer maximum electricity consumptionBrake lights (total)84 Watts
Turn signal, on each side42 Watts
Side lights (total)100 Watts
Rear lights (total)42 Watts
Rear fog light42 Watts
Never exceed the values indicated! Note
● If the r e

ar lights of the trailer are not cor-
rectly connected, the vehicle electronics may
be damaged.
● If the trailer absorbs excessive electric cur-
rent, the v
ehicle electronics may be dam-
aged.
● Never connect the trailer's electric system
directly t
o the electrical connections of the
tail lights or any other power sources. Only
use the connections intended for providing
electric current to the trailer. Ball coupling of towing bracket de-
v
ic
e* The ball coupling is provided with instruc-
tions
on fittin

g and removing the ball cou-
pling of the towing bracket. WARNING
The towing bracket ball coupling must be
st or

ed securely in the luggage compartment
to prevent them being flung through the vehi-
cle and causing injury. Note
● By l

aw, the ball coupling must be removed
if a trailer is not being towed if it obscures
the number plate. Driving with a trailer
Fig. 237
Turn the 13-pin connector Before driving
● Grip the 13-pin connector at area A and
r emo
v
e it in the direction of the arrow
››› Fig. 237.
● Remove the protective cover 5
› ›
› Fig. 225
up

wards.
After driving
● Grip the 13-pin connector at area A and
in ser
t

it in the opposite direction to the arrow
››› Fig. 237.
● Fit the protective cover 5
› ›
›

Fig. 225 on
the ball coupling. »
241
Technical data
Advice
Operation
Emergencies
Safety

Towing bracket device
permissible speed in an unfavourable road,
w e
ather or w
ind conditions. This applies es-
pecially when driving downhill.
You should always reduce speed immediately
if the trailer shows the slightest sign of snak-
ing. Never try to stop the “snaking” by in-
creasing speed.
Always brake in due course. If the trailer has
an overrun brake, apply the brakes gently at
first and then, firmly. This will prevent the
jerking that can be caused by locking of trail-
er wheels. Select a low gear in due course
before going down a steep downhill. This en-
ables you to use the engine braking to slow
down the vehicle.
Reheating
At very high temperatures and during pro-
longed slopes, driving in a low gear and high
engine speed, always monitor the coolant
temperature gauge ››› page 109.
Electronic stability control*
The ESC* system helps to stabilise the trailer
in case of skidding or rocking. Retrofitting a towing bracket*
Fig. 238
Attachment points for towing brack-
et . If a towing bracket is to be fitted after the ve-
hic
l
e i

s purchased, this must be completed
according to the instructions of the towing
bracket manufacturer. The attachment points for the towing bracket
A are on the lower part of the vehicle.
The di s
t

ance between the centre of the ball
coupling and the ground should never be
lower than the indicated value, even with a
fully loaded vehicle and including the maxi-
mum drawbar load.
Elevation values for securing the towing
bracket:
B65 mm (minimum)
C350 mm to 420 mm (fully laden vehicle)
D1040 mm
E317 mm
FLEON/LEON SCLEON ST
319 mm596 mm Fitting a towing bracket
●
Driving with a trailer involves an extra effort
f or the
v

ehicle. Therefore, before fitting a
towing bracket, please contact a Technical
Service to check whether your cooling system
needs modification.
● The legal requirements in your country
must
be observed (e.g. the fitting of a sepa-
rate control lamp).
● Certain vehicle components, e.g. the rear
bumper, mu
st be removed and reinstalled.
The towing bracket securing bolts must be »
243
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. 240. Opening the bonnet
Read the additional information carefully
› ›
›

 page 12
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. 263
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 269, 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.
271
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. 249
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 160.
– Disconnect the subwoofer’s
speaker cable
››› Fig. 249 1 . –
Turn the sec urin

g wheel in an anti-clock-
wise direction 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 272.
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 273.
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.
279
Technical data
Advice
Operation
Emergencies
Safety