2012 Seat Mii technical data

213
Vehicle care and maintenance
WARNING
The use of worn or damaged wheel trims could make driving more dan-
gerous and result in serious accidents and damage.
● Only wheel trims which have been approved for use with your vehicle
should be used.
● Inspect wheel trims regularly for damage and replace as required.
WARNING
If the bolted joints of wheel trims with bolted ring trims are not correctly
tightened or loosened, this could result in serious accident.
● Never loosen the bolted joints of wheel trims with bolted ring trims.
● Any work relating to wheel trims with bolted trims should be carried
out at Specialised workshop. SEAT recommends visiting a Technical Serv-
ice.

Replacement of new tyres and wheel trims
New tyres
● When tyres are new, drive with extreme caution for the first 600 km
(400 miles), as all tyres need to be run-in. Tyres which have not been run-in
do not have such good grip ⇒ 
or braking capacity ⇒ .
● All four wheels must be fitted with radial tyres of the same type, size
(rolling circumference) and the same tread pattern.
● The tread depth of new tyres may vary, according to the type and make
of tyre and the tread pattern. Replacing tyres
●
Where possible, always replace both wheels on an axle (both wheels on
the front axle or both wheels on the rear axle) ⇒ 
.
● Only replace used tyres with those authorised by SEAT for the corre-
sponding type vehicle. Pay special attention to size, diameter, and maxi-
mum load and speed capacity.
● Never use tyres which are larger than SEAT approved tyres. If the tyres
are too big, they may knock or rub against the chassis or other components,
resulting in damage.
WARNING
New tyres do not give maximum grip and will not have reached their max-
imum braking capacity to start with, and therefore need running in.
● To prevent accidents and major damage, extreme caution should be
taken for the first 600 km (400 miles).
WARNING
There should be adequate space between the tyres and the vehicle in ac-
cordance with the vehicle design. If this is not the case, the tyres may
rub against parts of the running gear, chassis or brake lines, leading to
faults in the brake system or to tread detachment, and the risk of burst
tyres.
● The true tyre dimension should not be greater than the dimensions of
tyres manufactured and approved by SEAT and should not rub against
parts of the vehicle.
Note
Although tyres may be shown as being the same size, the true dimensions
of different types of tyre may vary with respect to the nominal size, or tread
patterns may be different. 
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Vehicle care and maintenance
Checking tyre pressures
Check tyre pressures only when the vehicle has not been driven for more
than a few kilometres at low speeds in the past three hours.
● Check tyre pressures regularly, and only when the tyres are cold. Always
check all tyres, including the spare wheel. Check tyre pressures more often
in colder regions, and only when the vehicle has not been driven recently.
Always use a correctly-operating tyre gauge.
● Adjust tyre pressures to the loads carried in the vehicle.
● After adjusting the tyre pressure, check that the caps are properly
screwed.
The spare wheel or temporary spare wheel must be at the maximum pres-
sure specified.
WARNING
If tyre pressures are too high or too low, the tyre may deflate or burst
suddenly while driving. This could result in serious accident.
● If the tyre pressure is too low, the tyres could overheat, resulting in
tread detachment or even burst tyres.
● When driving at high speeds and/or fully loaded, the tyre could sud-
denly overheat, burst or be subject to tread detachment, with the resul-
tant loss of control of the vehicle.
● Tyre pressures which are too high or too low reduce the service life of
the tyre, affecting the vehicle's performance.
● Tyre pressures should be checked regularly, at least once a month
and before long journeys.
● Adjust the pressures of all the tyres to the vehicle load.
● Never deflate excess pressure from hot tyres.
CAUTION
● Take care not to tilt the manometer when placing it on the valve. Other-
wise, the valve may be damaged.
● To avoid damage to the valves, always replace valve caps correctly.
Check that the caps are identical to the standard caps and have been cor-
rectly tightened.
For the sake of the environment
Under-inflated tyres will increase the fuel consumption. 
Tread depth and wear indicators
Fig. 122 Tyre tread:
tread wear indicators
Tread depth
Certain driving conditions require a deeper tread, as well as needing the
tread to be approximately the same on the front and rear tyres. This is par-
ticularly important when driving in winter, in cold temperatures and on wet
roads ⇒ 
. 
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Vehicle care and maintenance
Running gear settings : an incorrectly positioned running gear increases the
wear of tyres and affects your safety while driving. If tyres wear too quickly,
have the wheel alignment checked at a Specialised workshop.
WARNING
If you notice unusual vibration or the vehicle pulls to one side while driv-
ing, this may indicate that one of the tyres is damaged.
● Reduce speed immediately and stop, while observing the highway
code.
● Check the wheels and tyres for damage.
● Never carry on driving on worn tyres or wheels. Request qualified as-
sistance immediately.
● If there is no visible exterior damage, drive slowly and carefully to the
nearest Specialised workshop and have the vehicle checked.

Spare wheel or temporary spare wheel*
Fig. 123 In the luggage
compartment: hand con-
trolled wheel for securing
the spare wheel Removing the spare wheel
●
Open the rear lid and lift the luggage compartment shelf ⇒ page 100.
● If necessary, remove the luggage compartment variable floor
⇒ page 100.
● Lift up the carpet from the recess and remove it from the luggage com-
partment.
● If necessary, take out the vehicle tool kit with the container.
● Completely remove the hand controlled wheel from the centre of the
spare wheel ⇒ Fig. 123 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, situate the replaced wheel in the
spare wheel well so that the wheel rim central hole coincides with the open-
ing.
● Turn the hand controlled wheel with the shank screwed clockwise until
the replaced wheel is secured.
● If necessary, store the vehicle tool in the container, inside the luggage
compartment.
● Replace the carpet on the luggage compartment floor.
● Lower the rear shelf.
● Close the rear lid.
If the spare 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
⇒ .
Refit the normal road wheel as soon as possible.
Please observe driving advice: 
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Vehicle care and maintenance
Radial
Rim diameter code
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 vehicle tyre
Nominal width of tyre in millimetres
Ratio of height to width (aspect ratio)
Tyre code (example)MeaningMake, logotypeManufacturerProduct nameName of tyre assigned by manufacturer.P255 / 55 R 18Size:PPassenger vehicle code.255Nominal width between walls, in mm.55Height/width ratio in %RTyre type (R indicates "radial").18Rim diameter in inches109 HLoad index ⇒ page 220 and speed rating
⇒ page 220.
XL(“Reinforced”) tyres.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 internation-
al legislation followed by a number denoting the
country granting the authorisation. The authori-
sation number ( several digits) is shown below.
123456789101112
Tyre code (example)MeaningDOT BT RA TY5 1709Tyre identification number (TIN a)
, may be only on
interior wall of wheel) and date of manufacture:
DOTThe tyre complies with the legal require-
ments of the US Department of Trans-
port, responsible for tyre safety regula-
tions.
BTPlace of manufacture code.RAInformation about manufacturer and tyre
size.
TY5Manufacturer's tyre specifications.1709Date of manufacture: Week 17 of 2009.TWIThis identifies the position of the Tread Wear In-
dicator ⇒ page 215.
Made in GermanyCountry of manufacture.MAX LOAD 615 KGUS load rating, indicating maximum permitted
load per tyre.
MAX INFLATION 350 KPA
(51 PSI)US limit, indicating maximum permitted tyre
pressure.
SIDEWALL 1 PLY RAYONInformation about tyre wall components:
1 layer of rayon (artificial silk).
TREAD 4 PLIES
1 RAYON + 2 STEEL +
1 NYLONInformation about tread components:
In the example, there are 4 layers below the
tread: 1 layer of rayon (artificial silk), 2 layers of
steel reinforcement and 1 layer of nylon.
Information for the end consumer concerning the comparative values of
the established base tyres (standardised test procedures) ⇒ page 233:
TREADWEAR 220Relative service life of the tyre, with respect to
specific US standard test.
TRACTION ABraking capacity of tyre on wet surface (AA, A, B
or C).
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Vehicle care and maintenance
Remove wheel hub covers and trim rings before fitting snow chains ⇒ 
.
The wheel bolts should be covered with caps for safety reasons. These are
available from Technical Services.
Temporary spare wheel
For technical reasons, snow chains must not be used on the compact tem-
porary spare wheel ⇒ page 217.
If it is necessary to fit chains with the temporary spare wheel in use, install
the temporary spare wheel on the rear axle in the event of a fault in a front
wheel. Then, fit the rear wheel that is free, instead of the damaged front
wheel. In this situation, observe the rotating direction of the wheels. SEAT
recommends attaching the snow chains before fitting the wheel.
WARNING
The use of unsuitable or incorrectly fitted chains could lead to serious ac-
cidents and damage.
● Always the appropriate snow chains.
● Observe the fitting instructions provided by the snow chain manufac-
turer.
● Never exceed the maximum permitted speeds when driving with snow
chains.
CAUTION
● You must remove the snow chains to drive on roads which are free of
snow. Otherwise they will impair handling, damage the tyres and wear out
very quickly.
● Wheel trims may be damaged or scratched if the chains come into direct
contact with them. SEAT recommends the use of covered snow chains.
Note
Snow chains are available in different sizes according to the vehicle type. 
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Vehicle care and maintenance
Running-in
Please observe the instructions for running-in new components.
Running-in the engine
The engine needs to be run in over the first 1500 km (1000 miles). During
its first few hours of running, the internal friction in the engine is greater
than later on when all the moving parts have bedded down.
How the vehicle is driven for the first 1500 km (1000 miles) influences the
future engine performance. Throughout the life of the vehicle, it should be
driven at a moderate speed, especially when the engine is cold, as this will
reduce engine wear and increase its useful life. Never drive at extremely low
engine speeds. Change down to a lower gear when the engine no longer
runs “smoothly”. Up to 1000 kilometres the following instructions apply:
● Do not use full throttle.
● Do not force the engine above two thirds of its maximum speed.
Between 1000 and 1500 kilometres (600 to 1000 miles), gradually in-
crease power until reaching the maximum speed and high engine speeds.
Running in new tyres and brake pads
● Replacement of new tyres and wheel trims ⇒ page 210
● Notes on the brakes ⇒ page 134
For the sake of the environment
If the engine is run in gently, the life of the engine will be increased and the
engine oil consumption reduced. 
Accessories and spare parts
SEAT recommends you consult an Official Service before purchasing acces-
sories and spare parts or consumables. For example, when fitting accesso- ries at a later date, or when replacing a component. A SEAT Official Service
will advise you as to the legal requirements and manufacturer's recommen-
dations regarding accessories, spare parts and other components.
SEAT recommend you use only approved
SEAT accessories and genuine
SEAT spare parts ®
. These parts and accessories have been specially tested
by SEAT for suitability, reliability and safety. In addition the SEAT Technical
Service will guarantee that the assembly is carried out professionally.
Although we continually monitor the market, SEAT cannot guarantee that
products not approved by SEAT are reliable, safe and suitable for the vehi-
cle. Therefore, SEAT cannot accept liability, even in those cases authorised
by an officially recognised technical inspection office or other official body.
Any retro-fitted equipment which has a direct effect on vehicle control must
be approved by SEAT for use in your vehicle and bear the e mark (the Euro-
pean Union's authorisation symbol). This includes cruise control systems or
electronically controlled suspension.
If any additional electrical components are fitted which do not serve to con-
trol the vehicle itself, these must bear the  mark (European Union manu-
facturer conformity declaration). This includes refrigerator boxes, laptops or
ventilator fans.
WARNING
Unprofessional repairs or modifications to the vehicle may affect the per-
formance of the airbags, resulting in operating faults or fatal accident.
● Never mount, fasten or fit objects such as drink holders or telephone
cradles over or next to the covers of the airbag modules or within their
deployment zones.
● Objects placed over the airbag covers, or within their deployment
zones, could lead to serious injury or loss of life if the airbags are trig-
gered.

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Vehicle care and maintenance
The vehicle owner should keep the documentation for the additional equip-
ment safely and hand it over to the scrap yard at the end of the vehicle's
service life. This ensures that any additional equipment mounted in end-of-
life vehicles is correctly disposed of with respect for the environment.
WARNING
Repairs or modifications which are not performed correctly may result in
damage or errors in the vehicle operation, affecting the efficiency of the
driver assist systems. This could result in serious accident.
● All repairs and modifications to the vehicle should only be performed
by a Specialised workshop.

Repair and faults in the airbag system
When performing repairs and technical modifications, SEAT's directives
must be observed! ⇒ 
Modifications and repairs to the front bumper, doors, front seats, and re-
pairs to the roof or chassis should only be carried out in a Specialised work-
shop. These components may contain parts or sensors belonging to the air-
bag system.
If work is carried out on the airbag system or parts have to be removed and
fitted on the system when performing other repair work, parts of the airbag
system may be damaged. The consequence may be that, in the event of an
accident, the airbag inflates incorrectly or does not inflate at all.
So that the effectiveness of the airbag is not reduced and that removed
parts do not cause any injuries or environmental pollution, regulations must
be observed. These requirements are known to qualified dealerships.
Modifications to the vehicle suspension may affect the operation of the air-
bag system in the event of collision. For example, if wheel and tyre combi-
nations not approved by SEAT are used, or if the vehicle height is lowered, the suspension is stiffened or the suspension springs, telescopic arms,
dampers, etc., are modified, the results received by the airbag sensors and
sent to the control unit may not be accurate. For example, some modifica-
tions to the suspension could increase the force measured by the sensors
and result in the triggering of the airbag systems in collisions. Under normal
conditions, the measured values would be lower and the airbag would not
have been triggered. Other modifications may reduce the forces measured
by the sensors and therefore the airbags are not triggered in situations
when they should have triggered.
WARNING
Repairs or modifications which are not performed correctly may result in
damage or errors in the vehicle operation, affecting the efficiency of the
airbag systems. This could result in serious or fatal accident.
● All repairs and modifications to the vehicle should only be performed
by a Specialised workshop.
● Airbag modules must never be repaired: if damaged, they must be re-
placed.
● Never fit recycled or reused airbag components in your vehicle.
WARNING
Modifications to the vehicle suspension, including the use of unauthor-
ised wheel and tyre combinations, may affect the performance of the air-
bags and increase the risk of serious or fatal injury in the event of acci-
dent.
● Never fit suspension components which are not identical to the origi-
nal parts mounted in the vehicle.
● Never use wheel and tyre combinations not approved by SEAT.

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Retro-fitting of two-way radios
An exterior aerial is required for the use of two-way radios in the vehicle.
The retro-fitting of electrical or electronic appliances in the vehicle is sub-
ject to their approval for use in your vehicle. Under certain circumstances,
this could mean that your vehicle registration documents are no longer val-
id.
SEAT has approved your vehicle for use with two-way radios providing the
following conditions are observed:
●The exterior aerial must be mounted professionally.
● The maximum transmitting power is 10 watts.
An only external aerial is needed to give the equipment its optimal reach.
Check first with a Specialised workshop if you wish to use a two-way radio
with a transmitting power of over 10 watts. The Specialised workshops are
familiar with the technical options for installation. SEAT recommends visit-
ing a Technical Service.
All legal requirements, together with the instructions for the use of two-way
radios must be observed.
WARNING
If the two-way radio is not securely fastened in position, it could be sent
flying around the vehicle in the event of sharp braking, sudden manoeu-
vres or accident, causing injury.
● While driving, two-way radios must be securely fastened in position,
outside the airbags deployment zones, or safely stowed away.
WARNING
When using a two-way radio without a connection to an exterior aerial,
the maximum permitted levels of electromagnetic radiation may be ex-
ceeded. This is also the case if the aerial has not been correctly installed.
● You should only use a two-way radio inside the vehicle if it has first
been correctly connected to an exterior aerial.

Information stored by the control units
Your vehicle is fitted at the factory with a series of electronic control units
responsible for the engine and gearbox management. In addition, the con-
trol units supervise the performance of the exhaust gas system and the air-
bag systems.
Therefore, while the vehicle is being driven, these electronic control units
are continuously analysing the vehicle data. In the event of faults or devia-
tions from the theoretical values, only this data is stored. Normally, the
warning lamps on the instrument panel light up in the event of faults.
This data can only be read and analysed using special equipment.
The storing of the data allows specialised workshops to detect and repair
faults. Stored data may include:
● Data relating to the engine or the gearbox
● Speed
● Direction of travel
● Braking force
● Detection of seat belt
The vehicle control units never record conversations held by passengers in
the vehicle. 