2017 MAZDA MODEL CX-3 brake sensor

4–172
When Driving
i-ACTIVSENSE
CAUTION
  When driving off-road in areas where there is grass or foliage, it is recommended that
the Smart City Brake Support [Reverse] (SCBS R) system be turned off.
  Always use tyres of the speci¿ ed size and the same manufacturer, brand, and tread
pattern on all 4 wheels. In addition, do not use tyres with signi¿ cantly different wear
patterns on the same vehicle. Do not use tyres with signi¿ cantly different wear patterns
on the same vehicle. Otherwise, the Smart City Brake Support [Reverse] (SCBS R)
system may not operate normally.
  If ice or snow is stuck on the ultrasonic sensors (rear) they may not be able to detect
obstructions correctly depending on the conditions. In such cases, the system may not
be able to perform controls correctly. Always drive carefully and pay attention to the
rear of the vehicle.

4–173
When Driving
i-ACTIVSENSE
NOTE
  The vehicle posture changes depending on the accelerator pedal, brake pedal and
steering wheel operations, which could make it dif¿ cult for the system to recognise an
obstruction, or it could facilitate unnecessary detection. In such cases, the Smart City
Brake Support [Reverse] (SCBS R) may or may not operate.
  The Smart City Brake Support [Reverse] (SCBS R) system will operate under the
following conditions.
 


 The engine is running.



 The change lever (manual transaxle vehicle) or the selector lever (automatic
transaxle vehicle) is in the R (reverse) position.
 


 The vehicle speed is between about 2 to 8 km/h (2 to 4 mph).



 The Smart City Brake Support [Reverse] (SCBS R) is not turned off.



 The DSC is not malfunctioning. 

 The Smart City Brake Support [Reverse] (SCBS R) operates using ultrasonic sensors
(rear) which detect obstructions at the rear by emitting ultrasonic waves and then
receiving the returning waves reÀ ected off the obstructions.

 In the following cases, the ultrasonic sensors (rear) cannot detect obstructions and the
Smart City Brake Support [Reverse] (SCBS R) may not operate.
 


 The height of the obstruction is low such as low walls or trucks with low loading
platforms.
 


 The height of the obstruction is high such as trucks with high loading platforms.



 The obstruction is small.



 The obstruction is thin such as a signpost.



 The obstruction is positioned away from the centre of the vehicle.



 The surface of the obstruction is not pointed vertically relative to the vehicle.



 The obstruction is soft such as a hanging curtain or snow stuck to a vehicle.



 The obstruction is shaped irregularly.



 The obstruction is extremely close.

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When Driving
i-ACTIVSENSE
NOTE
  In the following cases, the ultrasonic sensors (rear) cannot detect obstructions correctly
and the Smart City Brake Support [Reverse] (SCBS R) may not operate.
 


 Something is stuck on the bumper near an ultrasonic sensor (rear).



 The steering wheel is turned sharply, or the brake or accelerator pedal is operated.



 There is another obstruction near one obstruction.



 During inclement weather such as rain, fog and snow.



 High or low humidity.



 High or low temperatures



 Strong winds.



 The path of travel is not À at.



 Heavy luggage is loaded in the luggage compartment or on the rear seat.



 Objects such as a wireless aerial, fog light, or illuminated number plate is installed
near an ultrasonic sensor (rear).
 


 The orientation of an ultrasonic sensor (rear) has deviated for reasons such as a
collision.
 


 The vehicle is affected by other sound waves such as the horn, engine noise,
ultrasonic sensor of another vehicle.
 
 In the following cases, an ultrasonic sensor (rear) may detect something as a target
obstruction which could cause the Smart City Brake Support [Reverse] (SCBS R)
system to operate.
 


 Driving on a steep slope.



 Wheel blocks.



 Hanging curtains, gate poles such as at toll gates and railroad crossing.



 When travelling near objects such as foliage, barriers, vehicles, walls, and fences
along a road.
 


 When driving off-road in areas where there is grass and forage.



 When passing through low gates, narrow gates, car washing machines, and tunnels.



 A towing bar is installed or a trailer is connected. 

 (Manual transaxle)  If the vehicle is stopped by the SCBS operation and the clutch pedal is not depressed,
the engine stops.
  When the system operates, the user is noti¿ ed by the active driving display. 
 The Smart City Brake Support (SCBS) warning indication (amber) turns on when the
system has a malfunction.
 Refer to Warning Lights on page 4-36 .

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When Driving
i-ACTIVSENSE
*Some models.
Smart Brake Support (SBS) *
The Smart Brake Support (SBS) system alerts the driver of a possible collision using a
display and warning sound if the radar sensor (front) and the Forward Sensing Camera
(FSC) determine that there is the possibility of a collision with a vehicle ahead while the
vehicle is being driven at about 15 km/h or faster (10 mph or faster). Furthermore, if the
radar sensor (front) and the Forward Sensing Camera (FSC) 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 are applied ¿ rmly and
quickly to assist. (Brake Assist (SBS brake assist))
WARNING
Do not rely completely on the Smart Brake Support (SBS) system and always drive
carefully:
The Smart Brake Support (SBS) is designed to reduce damage in the event of
a collision, not avoid an accident. The ability to detect an obstruction is limited
depending on the obstruction, weather conditions, or traf¿ 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
In the following cases, turn the system off to prevent a mis-operation:  
 The vehicle is being towed or when towing another vehicle. 
 The vehicle is on a chassis roller. 
 When driving on rough roads such as in areas of dense grass or off-road.

4–17 7
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 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 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.



 When the vehicle ahead is not equipped with tail lights or the tail lights are turned
off.
 


 When warnings and messages, such as a dirty windscreen, related to the Forward
Sensing Camera (FSC) are being displayed in the centre display.
 
 Although the objects which activate the system are four-wheeled vehicles, the radar
sensor (front) 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 noti¿ ed by the active driving display. 
 The Smart Brake Support (SBS) warning indication (amber) turns on when the system
has a malfunction.
 Refer to Warning Lights on page 4-36 .

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When Driving
i-ACTIVSENSE
*Some models.
Radar Sensor (Front) *
Your vehicle is equipped with a radar sensor (front).
The following systems also use the radar sensor (front).
 


 Mazda Radar Cruise Control (MRCC)



 Distance Recognition Support System (DRSS)



 Smart Brake Support (SBS)
The radar sensor (front) functions by detecting the radio waves reÀ ected off a vehicle ahead
or an obstruction sent from the radar sensor.
The radar sensor (front) is mounted behind the front emblem.

Radar sensor (front)

If the Smart Brake Support/Smart City Brake Support (SBS/SCBS) Warning Light (amber)
is illuminated, the area around the radar sensor 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 7-49 .

4–18 8
When Driving
i-ACTIVSENSE
NOTE
  Under the following conditions, the radar sensor (front) may not be able to detect
vehicles ahead or obstructions correctly and each system may not operate normally.
 


 The rear surface of a vehicle ahead does not reÀ 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 reÀ 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 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. 

 Under the following conditions, the radar sensor (front) 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 speci¿ ed size,
manufacturer, brand, and tread pattern on all four wheels. In addition, do not use
tyres with signi¿ 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. 
 If the vehicle is driven on a road with little traf¿ c and few vehicles ahead or
obstructions for the radar sensor (front) to detect, the sensor detects that the radar
sensor (front) is dirty and the Smart Brake Support/Smart City Brake Support (SBS/
SCBS) Warning Light (amber) may be temporarily turned on. However, it does not
indicate a malfunction.

4–213
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.
  The beeper which indicates a system malfunction may not be heard if the ambient
temperature is extremely cold, or mud, ice, or snow adheres to the sensor area.
Remove any foreign material from the sensor area.
  When installing a trailer hitch, consult an expert repairer, we recommend an
Authorised Mazda Repairer.