2015 MAZDA MODEL 3 HATCHBACK brake sensor

*Some models.4–14 3
When Driving
i-ACTIVSENSE
NOTE
  In the following cases, the laser sensor (front) may inadvertently determine that there
is a vehicle ahead and the Smart City Brake Support (SCBS) system may operate.
 


 Objects on the road at the entrance to a curve.



 Vehicles passing in the opposite lane while making a curve.



 Metal objects, bumps, or protruding objects on the road.



 When passing through a toll gate.



 When passing under a vinyl curtain or fl ag.



 Plastic objects such as pylons.



 Two-wheeled vehicles, pedestrians, animals or standing trees.



 Vehicle is driven with some of the tyres having signifi cant wear. 

 When the system operates, the user is notifi ed by the fl ashing Smart City Brake
Support (SCBS) indicator light (red) and the active driving display * .   The Smart City Brake Support (SCBS) warning light (amber) turns on when the
system has a malfunction.
 Refer to Warning Lights on page 4-41 .
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*Some models.4–14 5
When Driving
i-ACTIVSENSE
Smart Brake Support (SBS) *
Smart Brake Support (SBS) is a system which alerts the driver of a possible collision using
an indicator and warning sound in the instrument cluster while the vehicle is being driven
at about 15 km/h or faster (10 mph or faster) and the system's radar sensor determines that
your vehicle may hit a vehicle ahead. Furthermore, if the radar sensor determines that a
collision is unavoidable, the automatic brake control is performed to reduce damage in the
event of a collision.
In addition, when the driver depresses the brake pedal, the brakes operate more quickly to
assist the driver (vehicles with brake fl uid pre-fi ll).
WARNING
Do not rely completely on the Smart Brake Support (SBS) system and always drive
carefully:
Smart Brake Support (SBS) is only designed to reduce damage in the event of a
collision. The ability to detect an obstruction is limited depending on the obstruction,
weather conditions, or traffi c conditions. Therefore, if the accelerator pedal or brake
pedal is mistakenly operated it could result in an accident. Always verify the safety of
the surrounding area and depress the brake pedal or accelerator pedal while keeping a
safer distance from vehicles ahead or on-coming vehicles.
CAUTION
If the vehicle is towed or you are towing something, switch the Smart Brake Support
(SBS) system off to prevent a miss-operation.
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4–14 6
When Driving
i-ACTIVSENSE
NOTE
  The Smart Brake Support (SBS) system operates when all of the following conditions
are met:
 


 The ignition is switched ON.



 The Smart Brake Support (SBS) system is on.



 The DSC OFF indicator light is not illuminated.



 The vehicle speed is about 15 km/h or faster (10 mph or faster).



 The relative speed between your vehicle and the vehicle ahead is about 15 km/h or
faster (10 mph or faster).
 


 The Dynamic Stability Control (DSC) is not operating. 

 The Smart Brake Support (SBS) system may not operate under the following
conditions:
 


 If there is the possibility of hitting only a part of a vehicle ahead.



 If the vehicle is accelerated rapidly and it comes close to a vehicle ahead.



 The vehicle is driven at the same speed as the vehicle ahead.



 The accelerator pedal is depressed.



 The brake pedal is depressed.



 The steering wheel is being operated.



 The selector lever is being operated.



 The direction indicator is being used. 

 Although the objects which activate the system are 4-wheeled vehicles, the radar
sensor could detect the following objects, determine them to be an obstruction, and
operate the Smart Brake Support (SBS) system.
 


 Objects on the road at the entrance to a curve (including guardrails and snow banks).



 A vehicle appears in the opposite lane while cornering or rounding a curve.



 When crossing a narrow bridge.



 When passing under a low gate or through a tunnel or narrow gate.



 When entering an underground parking area.



 Metal objects, bumps, or protruding objects on the road.



 If you suddenly come close to a vehicle ahead.



 When driving in areas where there is high grass or forage.



 Two-wheeled vehicles such as motorbikes or bicycles.



 Pedestrians or non-metallic objects such as standing trees. 

 When the system operates, the user is notifi ed by the fl ashing Smart Brake Support
(SBS) indicator light (red) and the active driving display.
  The Smart Brake Support (SBS) warning light (amber) turns on when the system has a
malfunction.
 Refer to Warning Lights on page 4-41 .
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*Some models.4–150
When Driving
i-ACTIVSENSE
Radar Sensor (Front) *
Your vehicle is equipped with a radar sensor (front).
The following systems also use the radar sensor (front).
 


 Smart Brake Support (SBS)



 Mazda Radar Cruise Control (MRCC)



 Distance Recognition Support System (DRSS)
The radar sensor (front) functions by detecting the radio waves refl ected off a vehicle ahead
or an obstruction sent from the radar sensor (front).
The radar sensor (front) is mounted behind the front emblem.
Radar sensor (front)
If the Smart Brake Support (SBS) warning light (amber) is illuminated, the area around the
radar sensor (front) may be dirty. Refer to “Warning Guidance” in the centre display (Type
B audio).
Refer to If a Warning Light Turns On or Flashes on page 7-32 .
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4–152
When Driving
i-ACTIVSENSE
NOTE
  In the following cases, the radar sensor (front) may not be able to detect vehicles ahead
or obstructions.
 


 The rear surface of a vehicle ahead does not refl ect radio waves effectively, such as
an unloaded trailer or an automobile with a loading platform covered by a soft top,
vehicles with a hard plastic tailgate, and round-shaped vehicles.
 


 Vehicles ahead with low vehicle height and thus less area for refl ecting radio waves.



 Visibility is reduced due to a vehicle ahead casting off water, snow, or sand from its
tyres and onto your windscreen.
 


 The boot/luggage compartment is loaded with heavy objects or the rear passenger
seats are occupied.
 


 Ice, snow, or soiling is on the front surface of the front emblem.



 During inclement weather such as rain, snow, or sand storms.



 When driving near facilities or objects emitting strong radio waves. 

 In the following cases, the radar sensor (front) may detect vehicles in the opposite
lane or surrounding obstructions, or it may not be able to detect vehicles ahead or
obstructions.
 


 The beginning and end of a curve.



 Roads with continuous curves.



 Narrow lane roads due to road construction or lane closures.



 The vehicle ahead enters the radar sensor's blind spot.



 The vehicle ahead is running abnormally due to accident or vehicle damage. 



 Roads with repeated up and down slopes



 Driving on poor roads or unpaved roads.



 The distance between your vehicle and the vehicle ahead is extremely short.



 A vehicle suddenly comes close such as by cutting into the lane. 

 To prevent incorrect operation of the system, use tyres of the same specifi ed size,
manufacturer, brand, and tread pattern on all four wheels. In addition, do not use
tyres with signifi cantly different wear patterns or tyre pressures on the same vehicle.
(Including the temporary spare tyre)
  If the battery power is weak, the system may not operate correctly. 
 When driving on roads with little traffi c and few vehicles ahead or obstructions for the
radar sensor (front) to detect, Smart Brake Support/Smart City Brake Support (SBS/
SCBS) warning light (amber) temporarily illuminates, however, this does not indicate
a problem.
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*Some models.4–153
When Driving
i-ACTIVSENSE
Laser Sensor (Front) *
The Smart City Brake Support (SCBS) laser sensor (front) is installed at the top of the
windscreen near the rearview mirror.
Laser sensor (front)
Always keep the surface of the windscreen around the laser sensor (front) clean to assure
proper operation of the Smart City Brake Support (SCBS) system.
WARNING
As there is the possibility of eye damage occurring from the laser, always heed the
following precautions:
 
 Never remove the sensor. 
 A removed sensor will not meet the conditions for a class 1M laser under the IEC
60825-1 specifi cation and therefore eye safety cannot be assured.

 Do not peer into the sensor using optical instruments with a magnifi cation function
such as magnifying glasses, and microscopic and objective lenses within a distance
of 100 mm (3.94 in) from the sensor.
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4–176
When Driving
Parking Sensor System
NOTE
  Do not install any accessories within the detection ranges of the sensors. It may affect
the system operation.
  Depending on the type of obstruction and the surrounding conditions, the detection
range of a sensor may narrow, or the sensors may not be able to detect obstructions.
  The system may not operate normally under the following conditions:




 Mud, ice, or snow is adhering to the sensor area (Returns to normal operation when
removed).
 


 The sensor area is frozen (Returns to normal operation when the ice is thawed).



 The sensor is covered by a hand.



 The sensor is excessively shocked.



 The vehicle is excessively tilted.



 Under extremely hot or cold weather conditions.



 The vehicle is driven on bumps, inclines, gravel, or grass covered roads.



 Anything which generates ultrasound is near the vehicle, such as another vehicle's
horn, the engine sound of a motorcycle, the air brake sound of a large-sized vehicle,
or another vehicle's sensors.
 


 The vehicle is driven in heavy rain or in road conditions causing water-splash.



 A commercially-available wing pole or an aerial for a radio transmitter is installed to
the vehicle.
 


 The vehicle is moving towards a tall or square curbstone.



 An obstruction is too close to the sensor. 

 Obstructions under the bumper may not be detected. Obstructions that are lower than
the bumper or thin which may have been initially detected but are no longer detected
as the vehicle approaches more closely.
  The following types of obstructions may not be detected:




 Thin objects such as wire or rope



 Things which absorb sonic waves easily such as cotton or snow



 Angular shaped objects



 Very tall objects, and those which are wide at the top



 Small, short objects 

 Always have the system inspected at an expert repairer, we recommend an Authorised
Mazda Repairer if any shock is applied to the bumpers, even in a minor accident. If the
sensors are deviated, they cannot detect obstructions.
 (With front sensor and front corner sensor) The system may have a malfunction if the beep does not operate or the indicator light
does not illuminate when the park assist sensors switch is turned on. Consult an expert
repairer, we recommend an Authorised Mazda Repairer.
 (Without front sensor and front corner sensor) The system may have a malfunction if the beep does not operate. Consult an expert
repairer, we recommend an Authorised Mazda Repairer.
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*Some models.7–36
If Trouble Arises
Warning/Indicator Lights and Warning Sounds
Signal Warning
ABS Warning Light If the ABS warning light stays on while you're driving, the ABS control unit has detected a
system malfunction. If this occurs, your brakes will function normally as if the vehicle had
no ABS.
Should this happen, consult an expert repairer, we recommend an Authorised Mazda
Repairer as soon as possible.
NOTE
When the engine is jump-started to charge the battery, uneven rpm occurs and the ABS
warning light may illuminate. If this occurs, it is the result of the weak battery and
does not indicate an ABS malfunction.
Recharge the battery.
(With DSC vehicles)
The brake assist system does not operate while the ABS warning light is illuminated.
Check Engine Light If this light illuminates while driving, the vehicle may have a problem. It is important to
note the driving conditions when the light illuminated and consult an expert repairer, we
recommend an Authorised Mazda Repairer.
The check engine light may illuminate in the following cases:
The fuel tank level being very low or approaching empty. The engine's electrical system has a problem. The emission control system has a problem.
If the check engine light remains on, or it fl ashes continuously , do not drive at high speeds
and consult an expert repairer, we recommend an Authorised Mazda Repairer as soon as
possible.
(Amber)
i-stop warning
light
*
When illuminated
If the i-stop warning light (amber) remains illuminated even after continuously pressing the
i-stop OFF switch under conditions other than when the bonnet is opened or the driver has
exited the vehicle (driver's seat belt is unfastened and driver's door is opened), consult an
expert repairer, we recommend an Authorised Mazda Repairer.
When fl ashing
The light fl ashes if there is any malfunction in the i-stop system. Consult an expert repairer,
we recommend an Authorised Mazda Repairer.
(Amber)
RVM warning light *
This warning light illuminates when the ignition is switched ON. The colour of the light
changes from amber to green when the rear vehicle monitoring system is operable, or
turns off when the system is turned off. The light stays on if the system has a malfunction.
Consult an expert repairer, we recommend an Authorised Mazda Repairer.
NOTE
This warning light may illuminate as a result of a temporary decrease in the sensitivity
of the radar sensor due to bad weather or dirt on the bumper surface. However, this does
not indicate a malfunction.
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