ECU Seat Mii 2017 Service Manual

Checking and refilling levels
Automatic device disconnection
The int el
lig
ent vehicle electrical system auto-
matically implements a range of measures to
prevent the battery from discharging when
high demands are made on it:
● The idling speed is increased so that the al-
ternat
or provides more electricity.
● Where necessary, the power to the most
power
ful devices is reduced or even com-
pletely disconnected.
● On starting the engine, the power supply
from the 12-v
olt power sockets and the ciga-
rette lighter may be interrupted for a short
time.
The on-board management program cannot
always prevent the battery from running flat.
For example, if the ignition is left on for a
long period with the engine off or if the side
lights or parking lights are left on while the
vehicle is stationary.
Why the battery runs flat:
● When stationary for a long time without
star
ting the engine, particularly if the ignition
is switched on.
● Use of electrical devices with the engine
switc
hed off. WARNING
Incorrectly securing the battery or using the
wron g b

attery can cause short-circuits, fire
and serious injuries.
● Always use only maintenance-free batter-
ies, prot
ected to prevent a leak, and whose
properties, specifications and size corre-
spond to the standard battery. WARNING
A highly explosive mixture of gases is re-
le a

sed when the battery is under charge.
● The batteries should be charged in a well-
ventil
ated room only.
● Never charge a frozen or recently thawed
batter
y. A flat battery can also freeze at tem-
peratures close to 0°C (+32°F).
● Always replace a battery which has frozen.
● Battery cables not correctly connected may
cause a shor
t circuit. Reconnect first the posi-
tive cable and then the negative cable. CAUTION
● Never di s

connect the battery if the ignition
is switched on or if the engine is running.
This could damage the electrical system or
electronic components.
● Never plug accessories that supply current,
such a
s solar panels or a battery charger, to
the 12-volt power socket or the cigarette
lighter. This could damage the vehicle's elec-
trical system. For the sake of the environment
Dispose of the battery in an environment-
friendly m anner

. Batteries contain toxic sub-
stances such as sulphuric acid and lead. For the sake of the environment
Battery acid can contaminate the environ-
ment. C o

llect any spilt service fluids and dis-
pose of them correctly. 199
Technical data
Advice
Operation
Emergencies
Safety

Advice
WARNING
Aggressive fluids or substances could result
in v i
sible or invisible damage with the conse-
quent risks.
● Always ensure that tyres do not come into
contact
with chemical products, oil, grease,
fuel, brake fluid or other aggressive substan-
ces. WARNING
Old tyres, even if they have never been used,
ma y

lose air or burst unexpectedly while driv-
ing, resulting in serious accident or damage.
● If tyres are over six years old, they should
only be u
sed in an emergency and with ex-
treme caution. For the sake of the environment
Old tyres must be disposed of by qualified
personnel ac

cording to the laws in the coun-
try concerned. Wheels
The design of wheel bolts is matched to the
rims. If
diff
er

ent rims are fitted, the correct
wheel bolts with the right length and correct-
ly shaped bolt heads must be used. This en-
sures that wheels are fitted securely and that
the brake system functions correctly
››› page 72. For technical reasons, it is not generally pos-
sibl

e to use the wheels from other vehicles.
In some cases, this may also be true for the
same model of wheel.
The tyres and rims approved by SEAT are spe-
cially matched to the characteristics of the
vehicle and are critical to good road holding
and safe handling.
Wheel bolts
Wheel bolts must be tightened to the correct
torque ››› page 72.
Beadlock wheel rims
Beadlock wheel rims have various compo-
nents. These are joined together by special
bolts using a special procedure. This ensures
good performance, a better seal, improved
safety and wheel run out. Therefore, worn
rims should always be replaced and must on-
ly be repaired in a specialised workshop.
SEAT recommends visiting a technical service
››› .
Wheel rims
w

ith bolted trims
Wheel rims may be fitted with interchangea-
ble trim parts which are attached to the rim
using self-locking bolts. Worn trims should
only be replaced at a specialised workshop.
SEAT recommends visiting a technical service
››› . WARNING
The use of worn or damaged wheel rims could
mak e driv

ing more dangerous and result in
serious accidents and damage.
● Only wheel rims which have been approved
for use w
ith your vehicle should be used.
● Inspect wheel rims regularly for damage
and repl
ace as required. WARNING
If the bolted joints of wheel rims with bolted
ring trims ar

e not correctly tightened or loos-
ened, this could result in serious accident.
● Never loosen the bolted joints of wheel
rims with bo
lted ring trims.
● Any work relating to wheel rims with bolted
rims shoul
d be carried out at specialised
workshop. SEAT recommends taking your car
in for technical service. Note
A SEAT Service Centre should be consulted to
find out whether wheel s

or tyres of different
sizes to those originally fitted by SEAT can be
fitted, and to find out about the combinations
allowed between the front axle (axle 1) and
the rear axle (axle 2). 202

Wheels and tyres
Spare wheel or temporary spare
wheel* Fig. 177
In the luggage compartment: hand
c ontr
o
lled wheel for securing the spare wheel Removing the spare wheel
● Open the rear lid and lift the luggage com-
p ar
tment

shelf ››› page 123.
● If necessary, remove the boot variable floor
›››
page 123.
● Lift up the carpet from the recess and re-
move it
from the luggage compartment.
● If necessary, take out the vehicle tool kit
with the cont
ainer.
● Completely remove the hand controlled
wheel from the c
entre of the spare wheel
››› Fig. 177 by turning it in an anticlockwise
direction, and take out the spare wheel. Storing the replaced wheel
● Pull back the carpet.
● With the wheel rim facing downwards, sit-
uate the rep
laced wheel in the spare wheel
well so that the wheel rim central hole coin-
cides with the opening.
● Turn the hand controlled wheel with the
shank s
crewed clockwise until the replaced
wheel is secured.
● If necessary, store the vehicle tool in the
container
, inside the boot.
● Replace the carpet on the boot floor.
● Lower the rear shelf.
● Close the rear lid.
If the sp
are wheel is different to the rest of
the vehicle tyres
If the spare tyre is not the same as the tyres
that are mounted on the vehicle - for example
with winter tyres or the temporary spare
wheel - you should only use the spare tyre for
a short period of time and drive with extra
care ››› .
R efit
the norm

al road wheel as soon as possi-
ble.
Please observe driving advice:
● Do not drive faster than 80 km/h (50 mph).
● Avoid heavy acceleration, hard braking and
fas
t cornering. ●
Snow ch
ains on the temporary spare wheel
are not permitted ›››
 page 41.
● After mounting the spare wheel or the tem-
porary
spare wheel, check the tyre pressure
as soon as possible ››› page 203.
It is advisable to check the spare wheel or
temporary spare wheel tyre pressure when
checking the rest of the vehicle wheels at
least once a month. The spare wheel should
have the highest pressure allowed for the ve-
hicle ››› page 203. The sticker situated on the
temporary spare wheel shows the tyre pres-
sure. WARNING
Incorrect handling of the spare wheel or the
tempor ar

y spare wheel can cause loss of ve-
hicle control, producing collisions or other
serious accidents and injury.
● Never use the spare wheel or the temporary
spar
e wheel if it is damaged or worn to the
wear indicator.
● In some vehicles the spare wheel is smaller
than the origina
l tyres. This can be seen on a
sticker showing the text “80 km/h” and
“50 mph”. This text indicates the maximum
velocity permitted for this type of tyre.
● Never drive faster than 80 km/h (50 mph).
Avoid po
werful acceleration, hard braking
and taking corners at high speed.
● Never drive more than 200 km with a tem-
porary
spare wheel fitted to the drive axle. » 207
Technical data
Advice
Operation
Emergencies
Safety

Advice
●
Rep l
ace the temporary spare wheel for a
normal wheel as soon as possible. The com-
pact temporary spare wheel is only intended
for temporary use over short distances.
● The temporary spare wheel must always be
secured w
ith the factory supplied wheel
bolts.
● You should never use more than one tem-
porary
spare wheel.
● After mounting the temporary spare wheel,
check
the tyre pressure as soon as possible
››› page 203.
● Snow chains on the temporary spare wheel
are not permitt
ed. Note
Wherever possible, secure the spare wheel,
tempor ar

y spare wheel or the replaced wheel
safely in the luggage compartment. In vehi-
cles with anti-puncture kit, it is not possible
to secure the defective wheel. Tyre code
Fig. 178
Universal code on tyres Radial
Rim di
amet
er c

ode
Load index & speed rating
DOT tyre identification number
Severe snow conditions
Tyre ply composition and materials used
Max. load rating
Treadwear, traction and temperature
grades
Max. permissible inflation pressure
Passenger car tyre
Nominal width of tyre in millimetres
1 2
3
4
5
6
7
8
9
10
11 Ratio of height to width (aspect ratio)
Tyre code (example): Meaning
P185 / 55 R 15: Size:
PPassenger vehicle code.
185Nominal width between walls, in
mm.
55Height/width ratio in %
RTyre type (R indicates "radial").
15Rim diameter in inches
109 HLoad index
››› page 209 and speed
rating ››› page 209.
XLReinforced tyres (“Reinforced”).
M+S or M/S orWinter tyres code (mud and snow
tyres).
RADIAL
TUBELESSRadial tyre without inner tube.
E4 ...E-mark certifying tyre complies with
international legislation followed by
a number denoting the country
granting the authorisation. The au-
thorisation number ( several digits)
is shown below.
DOT BT RA TY5 1716: Tyre identification number ( TINa)
,
maybe only on exterior wall of the wheel) and date of
manufacture. 12
208

Index
Index
A
Abr o
a
d
extended stay abroad with your vehicle . . . . . 179
sale of vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . 179
ABS see Anti-lock brake system . . . . . . . . . . . . . . . 137
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Acoustic alarm seatbelt unfastened . . . . . . . . . . . . . . . . . . . . . . 53
Adjust front seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Adjusting lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
rear head restraints . . . . . . . . . . . . . . . . . 51, 112
seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Adjusting the head restraints rear head restraints . . . . . . . . . . . . . . . . . . . . . 112
Advice for driving spare wheel or temporary spare wheel . . . . . . 207
Airbag covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . 14, 58 activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
cleaning dash panel . . . . . . . . . . . . . . . . . . . . . 178
control and warning lamps . . . . . . . . . . . . . . . . 62
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
front airbags . . . . . . . . . . . . . . . . . . . . . . . . . 14, 61
functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
locking the vehicle after deployment . . . . . . . . 95
repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
side airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
use of child seats . . . . . . . . . . . . . . . . . . . . . . . . 15
vehicle care . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Air conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . 129
air recir culation . . . . . . . . . . . . . . . . . . . . . . . . . 130
air vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
climatronic . . . . . . . . . . . . . . . . . . . . . . . . 28, 129
instructions for use . . . . . . . . . . . . . . . . . . . . . 132
malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
water under vehicle . . . . . . . . . . . . . . . . . . . . . 133
Air recirculation . . . . . . . . . . . . . . . . . . . . . . . . . . 130 climatronic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
how it works . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Air vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . 166, 180
Anti-freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Anti-lock brake system . . . . . . . . . . . . . . . . . . . . . 137
Anti-lock system . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Anti-puncture . . . . . . . . . . . . . . . . . . . . . . . . . . 35, 72
Anti-puncture kit . . . . . . . . . . . . . . . . . . . . . . . . 35, 72 check after 10 minutes . . . . . . . . . . . . . . . . . . . . 74
do not use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Anti-puncture set . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Anti-theft security system . . . . . . . . . . . . . . . . . . . 97
Ashtray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Aspects to take into account before starting the vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
ASR see Traction control system . . . . . . . . . . . . . . . 137
Assistance systems brake assist system (BAS) . . . . . . . . . . . . . . . . 138
cruise control . . . . . . . . . . . . . . . . . . . . . . . . . . 155
electronic differential lock (EDS) . . . . . . . . . . . 138
optical parking system (OPS) . . . . . . . . . . . . . 154
parking aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
parking distance warning system . . . . . . . . . . 154
safety Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 traction control (ASR) . . . . . . . . . . . . . . . . . . . . 138
traction contr
ol (TC) . . . . . . . . . . . . . . . . . . . . . 138
Assisted starting . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Audible warning control and warning lamps . . . . . . . . . . . . . . . . 25
lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Automatic belt retractor . . . . . . . . . . . . . . . . . . . . . 57
Automatic device disconnection battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Automatic dipped beam control . . . . . . . . . . . . . 104
Automatic gearbox driving tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
ignition key removal lock . . . . . . . . . . . . . . . . . 134
kick-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
starting on a slope . . . . . . . . . . . . . . . . . . . . . . 145
stopping on a slope . . . . . . . . . . . . . . . . . . . . . 145
Automatic gear change . . . . . . . . . . . . . . . . . . . . 144
Axle loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
B Bag support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
BAS see Brake assist system . . . . . . . . . . . . . . . . . . 138
Battery changing in the vehicle key . . . . . . . . . . . . . . . . 93
Battery acid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Before starting the vehicle . . . . . . . . . . . . . . . . . . 47
Belt tension device service and disposal . . . . . . . . . . . . . . . . . . . . . 58
Belt tensioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Belt tension limiter . . . . . . . . . . . . . . . . . . . . . . . . . 57
Belt tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Bonnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10, 187
Brake assist system . . . . . . . . . . . . . . . . . . . . . . . 137
219

Index
Brake fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 spec
ific
ation . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 brake assist system . . . . . . . . . . . . . . . . . . . . . 137
brake fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
brake fluid level . . . . . . . . . . . . . . . . . . . . . . . . 195
brake pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
brake servo . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
changing the brake fluid . . . . . . . . . . . . . . . . . 195
control and warning lamps . . . . . . . . . . . . . . . 136
running in new brake pads . . . . . . . . . . . . . . . 140
Brake servo . . . . . . . . . . . . . . . . . . . . . . . . . 137, 141
Brake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Braking brake assist system . . . . . . . . . . . . . . . . . . . . . 137
Bulb fault see "Changing bulbs" . . . . . . . . . . . . . . . . . . . . 79
C Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 windscreen washer liquid reservoir . . . . . . . . 196
Capacity natural gas tank . . . . . . . . . . . . . . . . . . . . . . . . 186
Caring for paintwork . . . . . . . . . . . . . . . . . . . . . . . 173
Caring for the vehicle exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . 152 control and warning lamps . . . . . . . . . . . . . . . 151
malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
CCS see cruise control . . . . . . . . . . . . . . . . . . . . . . . . 24
Central locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 emergency locking . . . . . . . . . . . . . . . . . . . . . . . . 9
opening doors individually . . . . . . . . . . . . . . . . 95 Central locking system
after airb ag deployment . . . . . . . . . . . . . . . . . . 95
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
remote control key . . . . . . . . . . . . . . . . . . . . . . . 95
Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Changing a wheel . . . . . . . . . . . . . . . . . . . . . . 36, 72 subsequent tasks . . . . . . . . . . . . . . . . . . . . . . . . 41
wheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Changing bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 front bumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
number plate light . . . . . . . . . . . . . . . . . . . . . . . 83
rear lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
side turn signal . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Changing gear . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 automatic gear change . . . . . . . . . . . . . . . . . . 144
control and warning lamps . . . . . . . . . . . . . . . 142
engaging the gears (automatic gearbox) . . . . 144
tiptronic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Changing the blades . . . . . . . . . . . . . . . . . . . . . . . 75
Changing the wiper blades . . . . . . . . . . . . . . . . . . 45
Charging the battery . . . . . . . . . . . . . . . . . . . . . . . 43
Child safety seat Securing with the seat belt . . . . . . . . . . . . . . . . 18
Child seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 65 disabling the front passenger front airbag . . . . 15
ISOFIX system . . . . . . . . . . . . . . . . . . . . . . . . 18, 69
mounting child seats . . . . . . . . . . . . . . . . . . . . . 17
mounting systems . . . . . . . . . . . . . . . . . . . . . . . 17
on the front passenger seat . . . . . . . . . . . . . . . . 68
on the rear seats . . . . . . . . . . . . . . . . . . . . . . . . . 69
regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
safety instructions . . . . . . . . . . . . . . . . . . . . 16, 64
Top Tether system . . . . . . . . . . . . . . . . . . . . . . . . 20
transporting children in the vehicle . . . . . . . . . 67
weight categories . . . . . . . . . . . . . . . . . . . . . . . . 67
Cigarette lighter . . . . . . . . . . . . . . . . . . . . . . . . . . 120 City Safety Assist function . . . . . . . . . . . . . . . . . . 156
contro l and warning lamps . . . . . . . . . . . . . . . 157
function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
special driving situations . . . . . . . . . . . . . . . . . 159
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 compartments . . . . . . . . . . . . . . . . . . . . . . . . . 177
dash panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
engine compartment . . . . . . . . . . . . . . . . . . . . 175
fabrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
padding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
seat belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
textile covers . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
washing the vehicle . . . . . . . . . . . . . . . . . . . . . 171
washing the vehicle with high pressure clean-ers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Cleaning the vehicle high pressure cleaners . . . . . . . . . . . . . . . . . . . 172
Climatronic adjusting the temperature . . . . . . . . . . . . . . . . . 28
air distribution . . . . . . . . . . . . . . . . . . . . . . . . . . 28
air recirculation . . . . . . . . . . . . . . . . . . . . . . . . . . 29
AUTO (automatic mode) . . . . . . . . . . . . . . . . . . . 28
controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
cooling mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
removing ice from windows . . . . . . . . . . . . . . . . 28
switch off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 bonnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 bonnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
electric windows . . . . . . . . . . . . . . . . . . . . . . . . . 11
luggage compartment . . . . . . . . . . . . . . . . . . . 100
panoramic sunroof . . . . . . . . . . . . . . . . . . . . . . . 11
windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
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