SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R)

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Purpose

•  The Smart City Brake Support [Reverse] (SCBS R) system is designed to apply the brakes automatically to reduce the damage from a possible collision if the driver fails to confirm the safety at the rear while reversing resulting in an increased possibility of a collision with vehicles or obstructions at the rear of the vehicle.
Caution
•  Tires for all four wheels must always be of the specified type and size. If tires other than the specified type and size are used, the Smart City Brake Support [Reverse] (SCBS R) may not operate normally.
•  Do not mix tire types or use tires with significantly different wear patterns on the same vehicle. Use of inappropriate tires could result in the DSC and Smart City Brake Support [Reverse] (SCBS R) not operating normally.
Note
•  The Smart City Brake Support [Reverse] (SCBS R) is designed only to assist the driver. Even if the Smart City Brake Support [Reverse] (SCBS R) is operating, the driver's operation is given priority. Therefore, if the driver operates the steering wheel, acceleration pedal and brake to avoid a possible collision, the Smart City Brake Support [Reverse] (SCBS R) is canceled.
•  To prevent a mistaken operation of the Smart City Brake Support [Reverse] (SCBS R) system when performing a vehicle inspection on a chassis dynamometer, turn off the Smart City Brake Support [Reverse] (SCBS R) system using the center display.

Functions


Brake prefill/brake control (SCBS brake)

•  The parking assist unit determines that a possible collision with a vehicle or obstruction at the rear has increased and activates the brake prefill when the brake prefill request signal is output to the DSC HU/CM. Then, if the driver does not perform an avoidance maneuver and there is the possibility of a collision, a brake control (SCBS brake) request signal is output to the DSC HU/CM to perform the brake control (SCBS brake).
―  Brake prefill
•  If the parking assist unit determines that the vehicle is approaching an obstruction such as a vehicle while reversing, the DSC HU/CM performs brake prefill, pressurizes the brake fluid to eliminate the play between the brake pads and disc plates. As a result, immediate braking force is available when the driver notices a condition at the rear of the vehicle and depresses the brake pedal.
―  Brake control (SCBS brake)
•  If the parking assist unit detects the vehicle may be in danger of a collision with an obstruction or vehicle while reversing, the DSC HU/CM automatically operates the brake control on all four wheels and, at the same time, a warning sound (Smart City Brake Support [Reverse] (SCBS R)) is activated.
•  Vehicle with multi-information display: Warning indications in the multi-information display to warn the driver.
•  Vehicle without multi-information display: The Smart City Brake Support (SCBS) indicator light (red) turns on to warn the driver.

Warning
•  The Smart City Brake Support [Reverse] (SCBS R) operates automatically when certain conditions are met, it is not a system, however, that prevents or avoids a collision.
•  The brake control (SCBS brake) has limitations. Always verify the safety of the surrounding area and depress the brake pedal while keeping a safe distance from vehicles or obstructions at the rear of the vehicle.
•  The brake prefill and brake control (SCBS brake) does not operate while the selector lever is in a position other than R position and the vehicle speed is less than 2 km/h {1 mph} or 8 km/h {5 mph} or more.

Smart City Brake Support [Reverse] (SCBS R) display function

•  Vehicle with multi-information display: The Smart City Brake Support [Reverse] (SCBS R) system notifies the driver of the system conditions using the Smart City Brake Support (SCBS) OFF indicator light and the multi-information display.
•  Vehicle without multi-information display: The Smart City Brake Support [Reverse] (SCBS R) system notifies the driver of the system conditions using the Smart City Brake Support (SCBS) OFF indicator light and the Smart City Brake Support (SCBS) indicator light (red)/Smart City Brake Support (SCBS) warning light (amber).
Note
•  If a malfunction occurs in the Smart City Brake Support [Reverse] (SCBS R) system, a warning message is indicated in the center display. For the message content and verification method, refer to the [CENTER DISPLAY]. (See CENTER DISPLAY.)


CONSTRUCTION, OPERATION

•  The Smart City Brake Support [Reverse] (SCBS R) uses two out of the four rear ultrasonic sensors located in the center of the rear bumper.
•  The rear ultrasonic sensors installed on the rear bumper detect vehicles and obstructions at the rear of the vehicle.
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System wiring diagram (Without Mazda Radar Cruise Control (MRCC) system) (VIN serial No. 100001—)

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System wiring diagram (Without Mazda Radar Cruise Control (MRCC) system) (VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.))

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System wiring diagram (With Mazda Radar Cruise Control (MRCC) system) (VIN serial No. 100001—)

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System wiring diagram (With Mazda Radar Cruise Control (MRCC) system) (VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.))

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•  When all of the following conditions are met to allow operation, the brake prefill/brake control operates if the possibility of a collision with vehicles or obstructions at the rear of the vehicle increases.
―  While engine is running
―  Selector lever position is in R position
―  Vehicle speed is approx. 2 km/h {1 mph} or more or approx. less than 8 km/h {5 mph}
―  No malfunction in Smart City Brake Support [Reverse] (SCBS R) system
―  Smart City Brake Support [Reverse] (SCBS R) has not been turned OFF using the personalization features
―  No malfunction occurring in DSC system
―  No malfunction occurring in parking assist unit related parts
Note
•  The rear ultrasonic sensors may not detect normally if ice, snow or dirt is adhering to them. Due to this the Smart City Brake Support [Reverse] (SCBS R) may not operate normally.
•  The rear ultrasonic sensors may not detect normally depending on the road surface or vehicle conditions. Due to this the Smart City Brake Support [Reverse] (SCBS R) may not operate normally.
•  Depending on the obstruction, the rear ultrasonic sensors may not detect it. Due to this, the Smart City Brake Support [Reverse] (SCBS R) may not operate normally.

Brake prefill operation

Solenoid valve operation table

Traction control solenoid valve

Stability control solenoid valve

Inlet solenoid valve

Outlet solenoid valve

Pump motor, pump

LF—RR

RF—LR

LF—RR

RF—LR

LF

RF

LR

RR

LF

RF

LR

RR
OFF (open)
OFF (close)
OFF (open)
OFF (close)
Operating

Hydraulic circuit diagram

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Block Diagram (VIN serial No. 100001—)

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Block Diagram (VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.))

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•  If the parking assist unit detects that the vehicle is approaching a vehicle or an obstruction while reversing, the brake prefill request signal (1) outputs to the laser sensor*1 or the forward sensing camera (FSC)*2.
•  If the laser sensor*1 or the forward sensing camera (FSC)*2 receives a brake prefill request signal (2), the brake prefill request signal is output to the DSC HU/CM.
•  When the DSC HU/CM receives the brake prefill request signal, it activates the pump motor (3). At this time, all of the solenoid valves are off and the brake fluid pressure generated by the pump motor is conducted (4) to the caliper pistons on each wheel.
•  By conducting the brake fluid pressure generated by the pump motor to the caliper pistons, the clearance between the brake pads and disc plates is maintained in a narrowed condition.
•  As a result, if the driver becomes aware of a vehicle or obstruction at the rear and depresses the brake pedal or the driver does not perform an avoidance maneuver and the brake control (SCBS brake) is operated, braking force is generated immediately and the braking distance is reduced.
*1  :VIN serial No. 100001—
*2  :VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.)
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Brake control (SCBS brake) operation

Solenoid valve operation table

Traction control solenoid valve

Stability control solenoid valve

Inlet solenoid valve

Outlet solenoid valve

Pump motor, pump

LF—RR

RF—LR

LF—RR

RF—LR

LF

RF

LR

RR

LF

RF

LR

RR
ON (close)
ON (open)
OFF (open)
OFF (close)
Operating

Hydraulic circuit diagram

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Block Diagram (VIN serial No. 100001—)

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Block Diagram (VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.))

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•  After the brake prefill operates, if the driver does not perform an avoidance maneuver, the parking assist unit determines that a collision may occur and the parking assist unit outputs a brake control (SCBS brake) request signal (1) to the laser sensor*1 or the forward sensing camera (FSC)*2.
•  When the laser sensor*1 or the forward sensing camera (FSC)*2 receives the brake control (SCBS brake) request signal it outputs the brake control (SCBS brake) (2) to the DSC HU/CM.
•  When the DSC HU/CM receives the brake control (SCBS brake) request signal, it energizes the linear control solenoid valves to switch the hydraulic pressure circuit and increase the brake fluid pressure. As a result, the brake control (SCBS brake) is activated (3).
•  While the brake control (SCBS brake) is operating, a brake light signal (4) from the DSC HU/CM is output to the rear body control module (RBCM) at the same time. When the rear body control module (RBCM) receives the brake light signal, it outputs a signal to the brake light relay*3 on or the brake light unit*4 and turns the brake lights on (5).
•  An answer signal (6) is output to the DSC HU/CM from the brake light relay*3 or the brake light unit*4 at the same time the brake lights are illuminated.
•  While the brake control (SCBS brake) is operating, a message is displayed in the multi-information display.
•  The brake control (SCBS brake) is maintained in this condition for approx. 2 s after the vehicle is stopped. Thereafter, the driver needs to depress the brake pedal to maintain the vehicle in a stopped condition.
*1  :VIN serial No. 100001—
*2  :VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.)
*3  :Without Smart Brake Support (SBS)
*4  :With Smart Brake Support (SBS)
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Smart City Brake Support [Reverse] (SCBS R) Display Function

•  The instrument cluster displays as indicated in the table below when the vehicle is under the following conditions.
Caution
•  The Smart City Brake Support function [Reverse] (SCBS R) is inhibited when the DTC in the laser sensor*1 or the forward sensing camera (FSC)*2 is stored by the on-board diagnostic function.
•  If DTCs are stored in the DSC HU/CM, parking assist unit, PCM or instrument cluster, the Smart City Brake Support [Reverse] (SCBS R) is inhibited depending on the cause of the malfunction.
*1  :VIN serial No. 100001—
*2  :VIN serial No. 200001— (Except European (L.H.D.) specs.), 500001— (European (L.H.D.) specs.)

Smart City Brake Support [Reverse] (SCBS R) display function table

Condition

Display content

Multi-information display indication (if equipped)

Smart City Brake Support (SCBS) indicator light (red) (if equipped)

Smart City Brake Support (SCBS) warning light (amber) (if equipped)

Smart City Brake Support (SCBS) OFF indicator light
Smart City Brake Support [Reverse] (SCBS R) OFF
Ignition is switched ON (engine off or on)
Smart City Brake Support [Reverse] (SCBS R) is turned OFF
No display
Off
Off
On
Smart City Brake Support [Reverse] (SCBS R) ON
Possibility of collision with vehicle or obstruction at rear
Brake control (SCBS brake) operating
On
Off
Off
If Smart City Brake Support [Reverse] (SCBS R) system malfunction occurs
While malfunction occurs in Smart City Brake Support [Reverse] (SCBS R) system
Off
On
Off