2012 Seat Mii sensor

156Driver assistance systems
Note
If the City Safety Assist function activates a brake, the brake pedal range is
reduced. This makes the brake pedal seem “harder”.
Note
Automatic brake intervention by the City Safety Assist function can be can-
celled by pressing the clutch pedal, the accelerator pedal or by a corrective
intervention.
Note
During the automatic braking by the City Safety Assist function you may
hear unusual noises. This is normal and is produced in the brakes system. 
Warning and control lamps
The City Safety Assist function is switched on every time the ignition is
switched on. No special indication is produced.
If the City Safety Assist function is switched off, functions or there is an error
in the system, this will be shown by a control lamp on the instrument panel
display.
lights upPossible cause ⇒ Solution
 
The City Safety Assist func-
tion has been switched on
manually using the button  
⇒ Fig. 98.
The control lamp turns off after
about 5 seconds.
flashesPossible cause ⇒ Solution

fast: The City Safety Assist
system function brakes auto-
matically or has braked auto-
matically.Control lamp turns off automati-
cally.
slow: City Safety Assist func-
tion is not currently available.
If the vehicle is stopped, switch
off the engine and switch it on
again. If necessary, inspect the
laser sensor (dirt, frozen) ⇒ 
in Laser sensor on page 157. If
it still does not function, refer to
a Specialised workshop to have
the system inspected.


within the operating area of
5-30– km/h (3-19 mph): The
City Safety Assist function
has been switched off man-
ually using the button  
⇒ 
Fig. 98.
Switch on the City Safety Assist
function manually using the but-
ton  
⇒ Fig. 98.
Several warning and control lamps light up for a few seconds when the igni-
tion is switched on while a test of the function is being carried out. They will
switch off after a few seconds.
WARNING
If the warning lamps are ignored, the vehicle may stall in traffic, or may
cause accidents and severe injuries.
● Never ignore the warning lamps.
● Stop the vehicle safely as soon as possible.
CAUTION
Failure to heed the warning lamps when they appear may result in faults in
the vehicle. 

157
Driver assistance systems
Laser sensor
Fig. 96 On the wind-
screen: City Safety Assist
function laser sensor
Fig. 97 Laser sensor de-
tection area
A laser sensor on the windscreen ⇒ Fig. 96 allows the system to detect driv- ing situations in front of the vehicle.
Vehicles ahead can be detected up to a distance of about 10 m.
WARNING
The laser beam on the laser sensor can produce serious injuries to the
eyes.
● Never focus optical devices, i.e. a camera, a microscope or a magnify-
ing glass closer than 100 mm from the laser sensor.
● Note that the laser beam can stay active when the City Safety Assist
system is switched off or unavailable. The laser beam is not visible to the
human eye.
CAUTION
If the windscreen is dirty or frozen in the area of the laser sensor, i.e. due to
rain, mist or snow, the City Safety Assist system may subsequently fail to
operate.
● Always keep the laser sensor area free of dirt and freezing.
● Use a small brush to remove snow and a de-icer spray to remove ice.
CAUTION
A damaged windscreen in the laser sensor area may cause the City Safety
Assist function to fail to operate.
● Replace the windscreen if it is scratched, cracked or chipped by stones
in the laser sensor area. Only use a windscreen authorised by SEAT. Carrying
out repairs is not permitted (i.e. in the case of damage suffered in an impact
from a stone).
● When replacing the windscreen wipers, only use windscreen wipers au-
thorised by SEAT.
● Do not paint the laser sensor area on the windscreen, or cover it with ad-
hesives, or sedimentation, etc. 
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158Driver assistance systems
Function
Fig. 98 In the lower part
of the centre console:
Button for the City Safety
Assist function
Switching on and off the City Safety Assist function
● Press the ⇒ Fig. 98 button on the centre console.
When the City Safety Assist function is switched on, the control lamp  
lights up on the instrument panel within the operational range, i.e. for
speeds between 5-30 km/h (3-19 mph). Switch off the City Safety Assist function in the following situations
Switching off the City Safety Assist function is recommended in the follow-
ing situations
⇒ 
:
● While the vehicle is being towed.
● If the vehicle has been taken to an automatic car wash.
● If the vehicle is above a test bed.
● If the laser sensor is faulty.
● After the laser sensor has been involved in a collision.
● When driving off road (overhanging branches).
● If objects are protruding above the bonnet, i.e. a load carried on the roof
that protrudes at the front.
● If the windscreen is damaged in the laser sensor area.
WARNING
Failure to switch off the City Safety Assist function in the above situa-
tions, may result in accidents and serious injury.
● Switch off the City Safety Assist function in critical situations.


159
Driver assistance systems
Special driving situations
Fig. 99 A: Vehicle on a bend. B: Motorcyclist driving
ahead out of range of the laser sensor
Fig. 100 Other vehicles
changing lanes
The City Safety Assist function has physical limits, and has limits deter-
mined by the system itself. In certain circumstances, this may produce reac-
tions from the City Safety Assist system, that are late or unexpected by the
driver. For this reason, always pay due attention and if necessary, intervene. For example, the following driving situations require special attention:
Driving through a bend
When entering or leaving a “long” bend, the vehicle may decelerate when
the laser sensor detects a vehicle travelling in the opposite lane
⇒ Fig. 99 A.
To interrupt the deceleration you can accelerate, turn the steering wheel or
press the clutch.
Narrow vehicles in front
The laser sensor will only detect narrow vehicles in front if they are in the
sensor detection zone ⇒ Fig. 99 B. This applies especially to narrow vehi-
cles such as motorbikes.
Other vehicles changing lanes
Vehicles changing lane in close proximity can cause an unexpected brake
from the City Safety Assist system ⇒ Fig. 100. To interrupt the deceleration
you can accelerate, turn the steering wheel or press the clutch. 
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160Driver assistance systems
Malfunction in the laser sensor
If the laser sensor operation is impaired, for example due to heavy rain,
spray, snow or dirt, the City Safety Assist system function is temporarily
switched off. On the instrument panel display the control lamp  flashes.
When the fault in the laser sensor has been rectified, the City Safety Assist
system function automatically becomes available. The control lamp 
switches off.
The following conditions could prevent the City Safety Assist system from
functioning:
● Tight bends.
● Accelerator pressed all the way down to the floor.
● If the City Safety Assist system is switched off or there is a fault
⇒ page 156.
● If the laser sensor is dirty, covered or overheated ⇒ page 157.
● In the event of snow, heavy rain or dense fog.
● If there are vehicles in front.
● Vehicles changing lanes.
● Vehicles moving in the opposite direction in the same lane.
● Very dirty vehicles with a low degree of reflection.
● Presence of thick dust. 
Hill hold
Introduction
Additional information and warnings:
● SEAT information system ⇒ page 22
● Braking, stopping and parking ⇒ page 134 ●
Vehicle battery ⇒ page 193
● Wheels and tyres ⇒ page 210
● Accessories, parts replacement, repairs and modifications ⇒ page 222
● Hill hold ⇒ page 273
WARNING
The smart technology included in the hill hold cannot change the laws of
physics. Do not let the extra convenience afforded by the hill hold tempt
you into taking any risks when driving.
● Any accidental movement of the vehicle could result in serious injury.
● The hill hold is not a replacement for driver awareness.
● Adjust your speed and driving style to visibility, weather, road and
traffic conditions.
● The hill hold cannot always keep the vehicle at a standstill on a slope
or brake sufficiently when travelling downhill (e.g. on slippery or frozen
surfaces).

Warning lamps
lights upPossible causeSolution
The Start-Stop system is ena-
bled.

The Start-Stop system is ena-
bled but the engine cannot be
automatically stopped.Contact a Specialised
workshop.

The Start-Stop system cannot
start the engine.Start the engine by hand
using the vehicle's key
⇒ page 120.
There is a fault in the alternator.⇒ page 193 

199
Vehicle care and maintenance
CAUTION
To prevent damage to the vehicle, please observe the following before en-
tering an automatic car wash :
● Compare the distance between the vehicle wheels and the distance be-
tween the guide-rails of the car wash to prevent damage to the wheels and
tyres!
● Switch off the rain sensor before taking the vehicle to an automatic car
wash.
● Compare the height and width of your vehicle with the available height
and width when entering and driving through the car wash!
● Fold in exterior mirrors Electrically retractable exterior mirrors must NOT
be folded in or out by hand. Always use the electrical power control.
● To avoid damaging the bonnet paintwork, rest the windscreen wipers on
the windscreen after drying the wiper blades. Do not let them fall!
● Lock the rear lid to prevent it from opening unexpectedly while inside
the car wash. 
Washing the vehicle with high pressure cleaning apparatus
When cleaning the vehicle with a high-pressure cleaner, always follow the
operating instructions for the equipment. Pay special attention to the re-
quired pressure of the jet and the distance between the jet and the vehicle
⇒ 
.
Keep a suitable distance from soft materials, such as rubber hoses or insu-
lating material, and from the parking distance warning system sensors. The
sensors of the parking distance warning system are situated on the rear
bumper ⇒ 
.
Do not use a nozzle that sprays the water out in a direct stream or one that
has a rotating jet for forcing off dirt ⇒ 
.
WARNING
The incorrect use of high pressure cleaning equipment could result in
permanent damage, visible or invisible, to the tyres or other materials.
This could result in serious accident.
● Ensure there is a suitable distance between the nozzle and the tyres.
● Never wash tyres with a concentrated jet or so-called “dirt blasters”.
Even at large spraying distances and short cleaning times, you may dam-
age the tyres.
WARNING
After the vehicle has been washed, the braking effect will be reduced
(and the braking distance increased) due to moisture (and ice in winter)
on the brakes.
● “Dry the brakes and remove ice” by braking carefully. Ensure that you
are not endangering other road-users or breaking traffic regulations in
the process.
CAUTION
● The temperature of the water must not be above +60 °C (+140 °F).
● To avoid damage to the paintwork, do not wash the vehicle in full sun.
● To ensure that the system functions well, the sensors located on the
bumper must be kept clean and free from ice. When cleaning with pressure
hoses and steam cleaners, the sensors should be sprayed only briefly. A
distance of 10 cm between the sensors and the steam / hose nozzle must
be observed.
● Do not use a high pressure cleaner to remove ice or snow from windows
● Washing the vehicle in low temperatures: When washing the vehicle
with a hose, do not direct water into the lock cylinders or the gaps around
the doors, rear lid, or sunroof. Locks and seals could freeze! 
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225
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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233
Vehicle care and maintenance
Notes for the user Introduction
Additional information and warnings:
● Exterior detail ⇒ page 6
● Accessories, parts replacement, repairs and modifications ⇒ page 222
● ⇒ Booklet Maintenance Programme
WARNING
Failure to treat the vehicle with the correct care increases the risk of acci-
dent and injury.
● Observe legal requirements.
● Observe the Instruction Manual.
CAUTION
If you do not treat the vehicle suitably, you may cause it to be damaged.
● Observe legal requirements.
● Carry out regular maintenance of the vehicle, according to specifications
in the Maintenance Programme.
● Observe the Instruction Manual. Labels and plates
Fig. 129 Warnings relat-
ing to handling of the
City Safety Assist system
laser sensor function
Some parts in the engine compartment come from the factory with certifi-
cates of safety, labels or plates containing important information regarding
the operation of the vehicle, for example, on the petrol cap, on the passeng-
er's sun visor, on the driver door strut, or on the floor of the luggage com-
partment.
● Never remove these certificates of safety, labels or plates, and ensure
they are kept in good condition and are legible.
● If a vehicle part, bearing a certificate of safety, label or plate, is re-
placed, the Specialised workshop should attach the information back in the
same place.
Certificate of safety
A certificate of safety on the door strut states that all the safety standards
and regulations established by the national traffic authorities responsible
for road safety were met at the time of manufacture. It may also give the
month and year of manufacture, together with the chassis number. 
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