PARKING SUPPORT BRAKE SYSTEM

FUNCTION OF COMPONENTS

The parking support brake system consists of the following components:

Component	Function
Clearance Warning ECU Assembly	Sends the drive force request signals and control status signals to the hybrid vehicle control ECU assembly and skid control ECU assembly. Sends the multi-information display request signals and PKSB OFF indicator light illumination request signals to the combination meter assembly. Determines the distance between an obstruction and the vehicle based on the signals from the ultrasonic sensors. Sounds the No. 1 clearance warning buzzer in accordance with the control status. Sounds the No. 2 clearance warning buzzer in accordance with the control status.
Steering Pad Switch Assembly - Multi-information Switch	Enables, disables or cuts off the operation of the parking support brake system by transmitting the switch operation signal to the combination meter assembly.
ECM	Sends the engine speed signal to the clearance warning ECU assembly via CAN communication.
Hybrid Vehicle Control ECU Assembly	Sends the accelerator pedal opening angle signal, shift status signal and drive force signal to the clearance warning ECU assembly via CAN communication. Receives the drive force request signals and control status signals from the clearance warning ECU assembly via CAN communication.
Combination Meter Assembly - Multi-information Display - PKSB OFF Indicator - Meter buzzer	Receives information from ultrasonic sensors via the clearance warning ECU assembly and displays it on the multi-information display. Receives the multi-information display request signals via CAN communication and displays the control status of the parking support brake system on the multi-information display. Illuminates the PKSB OFF indicator light when the parking support brake system is off and blinks it when the parking support brake system is malfunctioning. Sends the parking support brake system on/off signal to the clearance warning ECU assembly via CAN communication. The parking support brake system can be turned on or off using the steering pad switch assembly. Sounds the meter buzzer when the parking support brake system is operating or malfunctioning.
Meter Mirror Sub-assembly*1	Displays the control status of the parking support brake system based on the signals received from the clearance warning ECU assembly via CAN communication.
Stop Light Switch Assembly	Detects if the brake pedal is depressed and outputs a signal to the skid control ECU assembly.
Skid Control ECU Assembly	Sends the master cylinder pressure signal and wheel speed signals to the clearance warning ECU assembly via CAN communication. Receives the drive force request signal and control status signal from the clearance warning ECU assembly via CAN communication.
Steering Sensor	Sends the steering angle signal to the clearance warning ECU assembly via CAN communication.
Yaw Rate and Acceleration Sensor	Sends the yaw rate and acceleration sensor signal to the clearance warning ECU assembly via CAN communication.
Front Speed Sensor (LH/RH) Rear Speed Sensor (LH/RH)	Sends the wheel speed signals to the skid control ECU assembly.
Shift Lever Position Sensor	Sends the shift state signal to the hybrid vehicle control ECU assembly.
Front Corner Ultrasonic Sensor (FL sensor) Front Corner Ultrasonic Sensor (FR sensor) Front Center Ultrasonic Sensor (FLC sensor) Front Center Ultrasonic Sensor (FRC sensor) Rear Corner Ultrasonic Sensor (RL sensor) Rear Corner Ultrasonic Sensor (RR sensor) Rear Center Ultrasonic Sensor (RLC sensor) Rear Center Ultrasonic Sensor (RRC sensor)	Detects the distance between the vehicle and an obstacle.
No. 1 Clearance Warning Buzzer	Sounds upon receiving signals from the Clearance Warning ECU Assembly.
No. 2 Clearance Warning Buzzer	Sounds upon receiving signals from the Clearance Warning ECU Assembly.
Accelerator Pedal Sensor Assembly	Sends the accelerator pedal opening angle signal to the hybrid vehicle control ECU assembly.
Main Body ECU (Multiplex Network Body ECU)	Sends the driver seat belt signal to the clearance warning ECU assembly.
Air Conditioning Amplifier Assembly	Sends the ambient temperature signal to the clearance warning ECU assembly.
Blind Spot Monitor Sensor (LH/RH)*2	Sends blind spot monitor system status signals to the clearance warning ECU assembly via CAN communication.

*1: w/ Headup Display System
*2: w/ Blind Spot Monitor System

OPERATION CONDITIONS (Parking Support Brake System[stationary objects])

Driving torque restriction control
1. Initiation Condition (When all of the following conditions are met, the driving torque restriction control is performed.)
  - The parking support brake system is turned on.
  - An obstruction is detected by an ultrasonic sensor.
  - The vehicle speed is 15 km/h (9 mph) or less.
  - Collision is avoidable if emergency braking is performed by the driver.
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - No obstruction is detected by the ultrasonic sensors.
  - A possible collision is avoided.
Brake Control
1. Initiation Condition (When all of the following conditions are met, brake control is performed.)
  - Driving torque restriction control is performed.
  - A collision is likely even if emergency braking is performed by the driver.
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - The brake pedal is depressed after the vehicle is stopped by brake control.
  - Approximately 2 seconds have elapsed since the vehicle was stopped by brake control.
  - No obstruction is detected by the ultrasonic sensors.
Others
- Figure 1. Parking support brake system (stationary objects) operation
  When brake control is performed, the parking support brake system turns off automatically. The parking support brake system turns on again when no obstructions are detected by the ultrasonic sensors, the shift lever is moved from D to R or is moved from R to D, the power switch is turned off and then turned on (IG), or by using the settings screen on the multi-information display.

OPERATION CONDITIONS (Parking Support Brake [vehicles approaching from rear])

Driving torque restriction control
1. Initiation Condition (When all of the following conditions are met, the driving torque restriction control is performed.)
  - The parking support brake system is turned on.
  - The shift lever is in R.
  - When a vehicle is approaching the right or left at the rear of the vehicle.
  - The vehicle speed is 15 km/h (9 mph) or less.
  - When a collision with an approaching vehicle is imminent
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - When the vehicle approaching the right or left at the rear of the vehicle is no longer detected.
  - A possible collision is avoided.
Brake Control
1. Initiation Condition (When all of the following conditions are met, brake control is performed.)
  - Driving torque restriction control is performed.
  - A collision is likely even if emergency braking is performed by the driver.
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - The brake pedal is depressed after the vehicle is stopped by brake control.
  - Approximately 2 seconds have elapsed since the vehicle was stopped by brake control.
  - When the vehicle approaching the right or left at the rear of the vehicle is no longer detected.
Others
- Figure 2. Rear crossing traffic auto brake function operation
  When brake control is performed, the parking support brake system turns off automatically. The parking support brake system turns on again when no obstructions are detected by the ultrasonic sensors, the shift lever is moved from D to R or is moved from R to D, the power switch is turned off and then turned on (IG), or by using the settings screen on the multi-information display.

OPERATION CONDITIONS (Parking Support Brake [pedestrians behind vehicle])

Driving torque restriction control
1. Initiation Condition (When all of the following conditions are met, the driving torque restriction control is performed.)
  - The parking support brake system is turned on.
  - The shift lever is in R.
  - The vehicle speed is 15 km/h (9 mph) or less.
  - Possibility of collision with pedestrian behind vehicle.
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - A possible collision is avoided.
  - Pedestrians behind vehicle are no longer there.
Brake Control
1. Initiation Condition (When all of the following conditions are met, brake control is performed.)
  - Driving torque restriction control is performed.
  - A collision is likely even if emergency braking is performed by the driver.
2. Cancellation Condition (When any of the following conditions are met, driving torque restriction control is cancelled.)
  - The parking support brake system is turned off.
  - The brake pedal is depressed after the vehicle is stopped by brake control.
  - Approximately 2 seconds have elapsed since the vehicle was stopped by brake control.
  - Pedestrians behind vehicle are no longer there.
Figure 3. Parking Support Brake (pedestrians behind vehicle) operation
Others
- When the system operates up to the brake control, the PKSB system switch turns OFF automatically, and remains off until either the driver performs the PKSB system switch ON operation, the pedestrians to the rear of the vehicle disappear or the driver reverses the vehicle by 30cm(11.8 in.) or more.

CASES OF UNNECESSARY PARKING SUPPORT BRAKE SYSTEM (Stationary Objects)

In the following situations, the parking support brake system may operate even when there is no possibility of a collision:
1. Environmental influence
  - There is an obstacle on the shoulder of the road (when the vehicle is driven in a narrow tunnel, on a narrow bridge or on a narrow road).
  - The vehicle is being driven on grass or a gravel road.
  - The vehicle is driven toward a banner or flag, a low-hanging branch or a boom barrier (such as those used at railroad crossings, toll gates and parking lots).
    
    Tip:
    Even if the parking support brake system operates while on a railroad crossing, brake control will be automatically be canceled after approximately 2 seconds. Brake control can also be canceled by depressing the brake pedal. After brake control is canceled, depress the accelerator pedal to drive out of the railroad crossing.
  - The vehicle is close to other vehicles while being parallel parked.
  - The vehicle is being driven on a steep slope.
  - There are objects located lower than the ultrasonic sensors.
  - The vehicle is being driven on a narrow road.
  - There is a rut or hole in the surface of the road.
  - When the vehicle is driven on a metal cover (grating), such as those used for drainage ditches.
2. Influence from the weather
  - In severe weather such as fog, snow or a sandstorm.
  - Foreign matter such as snow, ice or mud is attached to an ultrasonic sensor. (The system returns to normal when the foreign matter is removed.)
  - When there is a downpour, or water is splashing on the vehicle.
  - Water is covering an ultrasonic sensor due to a flooded road.
3. Influence from other ultrasonic waves
  - When ultrasonic waves are received from the horn or parking sonar system of another vehicle, a motorcycle engine, or the air brakes of a large vehicle.
  - Electronic components such as a backlit license plate (especially fluorescent types), fog lights, a fender pole or a wireless antenna are installed near an ultrasonic sensor.
4. Changes in the vehicle.
  - The height of the vehicle has drastically changed due to loading (the nose tilts up or down).
  - The vehicle is significantly tilted.
  - An ultrasonic sensor is misaligned due to a collision, etc.
5. Others
  - The vehicle is being loaded onto a ship, truck or other transport vessel.
  - The vehicle is being operated on a drum tester such as a speedometer tester, brake/speedometer combination tester or chassis dynamometer.
  - When the vehicle is being towed.

CASES OF UNNECESSARY PARKING SUPPORT BRAKE (Vehicles Approaching from Rear)

In the following situations, the rear crossing traffic auto brake function may operate even when there is no possibility of a collision:

When a vehicle is travelling along a road that is located extremely close to a parking space.
When a vehicle is entering an adjacent parking space.
When an object is passing extremely close to the vehicle.

Table 1.
*1	Passing in front of the vehicle
*2	Metal Wall

When there is a metal object behind the vehicle such as a guard rail, wall, traffic sign or parked vehicle that easily reflects radio waves.

CASES OF UNNECESSARY PARKING SUPPORT BRAKE (Pedestrians Behind Vehicle)

Situations in which pedestrians cannot be detected normally.
- Solid objects (pillars, pylons, fences, parked vehicles, etc.)
- Moving objects (such as passing vehicles, motorcycles, etc.)
- Moving objects (such as flags, exhaust gas, large drops of rain, large snowflakes, rainwater on roads, etc.)
- Patterns on roads (white lines, pedestrian crossings, stones, streetcar rails, repaired areas, fallen leaves, gravel, etc.)
  Surrounding objects reflected off puddles or wet road surfaces.
- Shadows.
- Driving onto an area with a difference in height.
  Grating, ditches and gutters.
  Sides of roads and steps.
- The vehicle is extremely tilted (loaded, suddenly braking, etc.).
  A lowered suspension or tire with a different diameter than a genuine tire, etc. is installed.
  There are changes in gradient.
- The camera is dirty (dirty, snow-melting agents, etc.).
  Water drops are moving over the camera lens.
1. Others
  - An aftermarket accessory (backlit license plate, fog light, etc.) is installed near the rear camera.
  - An aftermarket protective part is installed to the rear bumper (bumper trim, etc.).
  - The axis of the camera is misaligned (due to reinstallation, collision, etc.).
  - A towing hook is installed.

MULTI-INFORMATION DISPLAY AND HEADUP DISPLAY (w/ Headup Display System)

parking support brake system display
- The parking support brake system uses the multi-information display in the combination meter assembly, the meter mirror sub-assembly and PKSB OFF indicator light to indicate the operation status of the system.

parking support brake system operation status display

When the operation conditions are met, the clearance warning ECU assembly sends display or illumination request signals to the combination meter assembly, combination meter mirror ECU and PKSB OFF indicator light. The clearance warning ECU assembly also sends buzzer sound request signals to the combination meter assembly.

Situation	Multi-information Display	Headup Display*4	PKSB OFF Indicator Light	Meter Buzzer
Driving torque restriction control	BRAKE ! *3	BRAKE !	Not illuminated	Sounds once
Driving torque restriction control is being performed (accelerationrestricted)	Object Detected Acceleration Reduced1,3	Not displayed	Not illuminated Selecting "Parking Support Brake Off" on the multi-information display turns off the parking support brake system. While the parking support brake system is off, the PKSB OFF indicator light illuminates.*2	Does not sound
Maximum driving torquerestriction control is being performed (strong braking is required)	BRAKE ! *3	BRAKE !		Sounds once
Brake control is beingperformed (Emergencybraking is required)	BRAKE ! *3	BRAKE !
Vehicle is stopped after brake control has been performed	Switch to Brake	Release Acceleratorand Depress Brake	Illuminates
Parking support brake system is off	Not displayed	Not displayed	Illuminates	Does not sound

*1: May be displayed if snow or other foreign matter is attached to an ultrasonic sensor.

*2: The parking support brake system turns on again when the power switch is turned off and then on (IG).

*3: Brake pedal is not depressed

*4: w/ Headup Display System

parking support brake system warning display

When operation of the parking support brake system is temporarily suspended due to a malfunction or dirty ultrasonic sensor, a message is displayed on the multi-information display in the combination meter assembly, the PKSB OFF indicator light blinks and the buzzer sounds.

Situation	Multi-information Display	PKSB OFF Indicator Light	Meter Buzzer
The parking support brake system is malfunctioning	Parking Support Brake Malfunction VisitYour Dealer	Blinks	Sounds
The parking support brake system is temporarily suspended (due toa dirty ultrasonic sensor, etc.)*1	Parking Support Brake Unavailable *2		Does notsound
	Parking Support Brake Unavailable Remove the Dirt of Rear Camera		Does notsound

*1: Including when the shift lever is not in D or R.

*2: Only displayed when the power switch is turned on (IG).

*A	for Sport Package	*B	except Sport Package
*a	PKSB OFF Indicator	-	-

parking support brake system off display

When the parking support brake system is off, the PKSB OFF indicator light illuminates.

PARKING SUPPORT BRAKE SYSTEM SYSTEM DESCRIPTION