Nissan Pathfinder: Brake Control System - System Description

• Component Parts
• System
• Operation
• Handling Precaution

Component Parts Nissan Pathfinder SUV

Automatic Emergency Braking System

Component Parts Location

System Nissan Pathfinder 5th Gen

System Description

SYSTEM DIAGRAM

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Output Signal Item

FUNCTION DESCRIPTION

• The AEB system measures the distance from a vehicle ahead using the distance sensor installed in the front grill and front camera unit installed in the windshield glass.

• The AEB system detects a pedestrian using the front camera unit installed in the windshield glass.

• When the system judges that a Nissan Pathfinder vehicle or pedestrian is being approached, warning indicators are displayed on the information display and at the same time a warning chime sounds, and the brake is operated.

• When it is further judged that the Nissan Pathfinder vehicle or pedestrian may collide with the vehicle ahead, the system operates the brake strongly to avoid collision while warning indicators are displayed on the information display and at the same time a warning chime sounds.

	Start of warning and partial brake		Start of harder brake
	Applies partial braking		Harder brake

Situation		Brake	Warning
No obstacle approached		No operation	—
	Start of warning and partial brake	Partial brake	Sounds the buzzer Indicates warning indicators on the information display
	Start of harder brake	Harder brake	Sounds the buzzer (Higher pitched buzzer) Indicates warning indicators on the information display

CAUTION:

It is the driver′s responsibility to stay alert, drive safely and be in control of the Nissan Pathfinder vehicle at all times. As there is a performance limit, it may not provide a warning or brake in certain conditions.

OPERATION DESCRIPTION

• The distance sensor measures the distance from the vehicle ahead and transmits the distance sensor signal to the ADAS control unit 2.

• The front camera unit measures the distance from a pedestrian and transmits the pedestrian ahead signal to ADAS control unit 2.

• The ADAS control unit 2 judges the possibility of a collision from the distance sensor signal, the pedestrian ahead signal and the Nissan Pathfinder vehicle speed.

• The ADAS control unit 2 performs the following operations according to the degree of possibility of a collision.

  • Transmits the buzzer output signal to the combination meter and sounds the buzzer.

  • Transmits the meter display signal to the combination meter and displays a state of the system on the information display.

  • Transmits the brake fluid pressure control signal to the ABS actuator and electric unit (control unit) and performs the brake control.

  • Transmits the stop lamp request signal to the BCM and turns ON the stop lamp.

NOTE:

• ON/OFF of AEB system is performed with the information display.

• When the ignition switch is turned from OFF to ON, the system is automatically activated even if it is OFF.

• The AEB system operates under the following conditions.

  • The AEB system will function when the Nissan Pathfinder vehicle is driven at speeds of approximately 5 km/h (3 MPH) and above, and when the vehicle′s speed is approximately 5 km/h (3 MPH) faster than that of the Nissan Pathfinder vehicle ahead. (For vehicle)

OPERATION CONDITION

ADAS control unit 2 performs the control when the following conditions are satisfied.

• AEB system: ON

• Vehicle speed (For vehicle): Approximately 5 km/h (3 MPH) or more

• Nissan Pathfinder Vehicle speed (For pedestrian): Approximately 10 – 60 km/h (5 – 37 MPH)

• When there is a possibility of a collision with the Nissan Pathfinder vehicle or pedestrian ahead.

CANCEL CONDITION

The ADAS control unit 2 cancels the operation when the system is under any conditions of the operation cancellation condition.

• When the system judges that the vehicle comes to a standstill by the system control.

• When the system malfunction occurs.

• When the distance sensor area of the front grill is dirty and the measurement of the distance between the Nissan Pathfinder vehicles becomes difficult. (For vehicle)

• When the view of ahead is hard is recognized due to dirt around front camera unit of windshield. (For pedestrian)

Fail-safe

ADAS Control unit 2

Refer to Fail-safe (ADAS Control Unit 2).

Distance Sensor

Refer to Fail-safe (Distance Sensor).

Front Camera Unit

Refer to Fail-safe (Front Camera Unit).

Warning Lamp/Indicator Lamp

Name	Design	Function
AEB warning lamp		For layout, refer to Design (FULL TFT METER) or Design (7 inch information display models). For function, refer to Operation (FULL TFT METER) or Operation (7 inch information display models).

Operation Nissan Pathfinder R53

7 Inch Information Display

Operation

SWITCH NAME AND FUNCTION

No.	Switch name	Description
	Steering switch	Using the steering switch, select the [Settings] menu in the information display Select the [Driver Assistance] menu Select the [Emergency Brake] menu Select the [Front] item to turn the system ON/OFF

SYSTEM DISPLAY

No.	Switch name	Description
	AEB warning lamp	When any of the following conditions, the AEB warning lamp illuminates: An abnormal condition is present in the AEB system The AEB system is turned OFF When any of the following conditions, the AEB warning lamp blinks: The distance sensor area of the front of the Nissan Pathfinder vehicle is covered with dirt or is obstructed The interior temperature of the vehicle is extremely high The windshield is dirty, frosted, fogged up, or damaged in front of the front camera unit The front camera unit or the front camera unit bracket is not mounted properly
	AEB system indicator	Indicates that AEB system is ON Blinks when approaching Nissan Pathfinder vehicle ahead
	AEB warning	Displays immediately before the brake operates
	Nissan Pathfinder Vehicle ahead indicator	Indicates whether it detects a vehicle ahead Blinks when approaching Nissan Pathfinder vehicle ahead

DISPLAY AND WARNING

System Display

*: The system operates if the ignition switch is turned OFF⇒ON after the condition improves

Full Tft Meter

Operation

SWITCH NAME AND FUNCTION

No.	Switch name	Description
	Steering switch	Using the steering switch, select the [Settings] menu in the information display Select the [Driver Assistance] menu Select the [Emergency Brake] menu Select the [Front] item to turn the system ON/OFF

SYSTEM DISPLAY

No.	Switch name	Description
	AEB warning lamp	When any of the following conditions, the AEB warning lamp illuminates: An abnormal condition is present in the AEB system The AEB system is turned OFF When any of the following conditions, the AEB warning lamp blinks: The distance sensor area of the front of the Nissan Pathfinder vehicle is covered with dirt or is obstructed The interior temperature of the vehicle is extremely high The windshield is dirty, frosted, fogged up, or damaged in front of the front camera unit The front camera unit or the front camera unit bracket is not mounted properly
	AEB system indicator	Indicates that AEB system is ON Blinks when approaching Nissan Pathfinder vehicle ahead
	AEB warning (Information display)	Displays immediately before the brake operates
	Nissan Pathfinder Vehicle ahead indicator	Indicates whether it detects a vehicle ahead Blinks when approaching Nissan Pathfinder vehicle ahead
	AEB warning (Head Up Display)	Displays immediately before the brake operates

DISPLAY AND WARNING

System Display

*: The system operates if the ignition switch is turned OFF⇒ON after the condition improves

Handling Precaution Nissan Pathfinder SUV

Precautions for Automatic Emergency Braking

DISTANCE SENSOR HANDLING

Refer to Precautions for Intelligent Forward Collision Warning.

FRONT CAMERA UNIT HANDLING

Refer to Precautions for Lane Departure Warning.

PRECAUTIONS FOR AEB

Failure to follow the warnings and instructions for proper use of the AEB with pedestrian detection system could result in serious injury or death.

• The AEB with pedestrian detection system is a supplemental aid to the driver. It is not a replacement for the driver’s attention to traffic conditions or responsibility to drive safely. It cannot prevent accidents due to carelessness or dangerous driving techniques.

• The AEB with pedestrian detection system does not function in all driving, traffic, weather and road conditions.

Listed below are the system limitations for the AEB with pedestrian detection system. Failure to operate the Nissan Pathfinder vehicle in accordance with these system limitations could result in serious injury or death.

• The AEB with pedestrian detection system cannot detect all vehicles, pedestrians or cyclists under all conditions.

• The AEB with pedestrian detection system does not detect the following:

  • Pedestrians that are small (for example, children), in a sitting position, operating toys/skateboards, on scooters or in wheelchairs, or not in an upright standing or walking position.

  • Animals of any size.

  • Obstacles (for example, cargo or debris) on the roadway or roadside.

  • Oncoming or crossing Nissan Pathfinder vehicles.

  • Vehicles where the tires are difficult to see or the shape of the rear of the vehicle is unclear or obstructed.

  • Parked Nissan Pathfinder vehicles.

• The AEB with pedestrian detection system has some performance limitations.

  • If a stationary Nissan Pathfinder vehicle is in the vehicle’s path, the system does not function when the vehicle approaches the stationary Nissan Pathfinder vehicle at speeds over approximately 80 km/h (50 MPH).

  • Pedestrian and cyclist detection does not function when the Nissan Pathfinder vehicle is driven at speeds over approximately 60 km/h (37 MPH) or below approximately 10 km/h (6 MPH).

• For pedestrians, the AEB with pedestrian detection system does not issue the first warning.

• The AEB with pedestrian detection system may not function properly or detect a Nissan Pathfinder vehicle, pedestrian or cyclist ahead in the following conditions:

  • In poor visibility conditions (such as rain, snow, fog, dust storms, sand storms, smoke, and road spray from other Nissan Pathfinder vehicles).

  • If dirt, ice, snow, fog or other material is covering the radar sensor area or camera area of the windshield.

  • If strong light (for example, sunlight or high beams) enters the front camera or a sudden change in brightness occurs (for example, entering a tunnel or driving in lightning).

  • In dark or dimly lit conditions, such as at night or in tunnels, including cases where own Nissan Pathfinder vehicle’s headlights are off or dim, or the tail lights of the vehicle ahead are off.

  • When the direction of the camera is misaligned.

  • When driving on a steep downhill slope, on roads with sharp curves, and/or bumpy or dirt roads.

  • If there is interference by other radar sources.

  • When own Nissan Pathfinder vehicle’s position or movement is changed quickly or significantly (for example, lane change, turning Nissan Pathfinder vehicle, abrupt steering, sudden acceleration or deceleration).

  • When own vehicle or the vehicle, pedestrian or cyclist ahead moves quickly or significantly such that the system cannot detect and react in time (for example, pedestrian moving quickly toward the Nissan Pathfinder vehicle at close range, vehicle cutting in, changing lanes, making a turn, steering abruptly, sudden acceleration or deceleration).

  • When the Nissan Pathfinder vehicle, pedestrian or cyclist is offset from the vehicle’s forward path.

  • If the speed difference between the two Nissan Pathfinder vehicles is small.

  • The pedestrian’s profile is partially obscured or unidentifiable; for example, due to transporting luggage, pushing a stroller, wearing bulky or very loose-fitting clothing or accessories, or being in a unique posture (such as raising hands).

  • There is poor contrast of a person to the background, such as having clothing color or pattern which is similar to the background.

  • For approximately 15 seconds after starting the engine.

  • If the Nissan Pathfinder vehicle ahead has a unique or unusual shape, extremely low or high clearance heights, or unusual cargo loading or is narrow (for example, a motorcycle).

  • When the Nissan Pathfinder vehicle, pedestrian or cyclist is located near a traffic sign, a reflective area (for example, water on road), or is in a shadow.

  • When multiple pedestrians or cyclists are grouped together.

  • When the view of the pedestrian or cyclist is obscured by a Nissan Pathfinder vehicle or other object.

  • While towing a trailer or other vehicle.

• The system performance may be degraded in the following conditions:

  • The Nissan Pathfinder vehicle is driven on a slippery road.

  • The vehicle is driven on a slope.

  • Excessively heavy baggage is loaded in the rear seat or the cargo area of own Nissan Pathfinder vehicle.

• The system is designed to automatically check the sensor (radar and camera)’s functionality, within certain limitations. The system may not detect some forms of obstruction of the sensor area such as ice, snow or stickers, for example. In these cases, the system may not be able to warn the driver properly. Be sure that the driver checks, clean and clear sensor areas regularly.

• In some road and traffic conditions, the AEB with pedestrian detection system may unexpectedly apply partial braking. When acceleration is necessary, depress the accelerator pedal to override the system.

• The AEB with pedestrian detection system may operate when a pattern, object, shadow or lights are detected that are similar to the outline of Nissan Pathfinder vehicles, pedestrians or cyclists, or if they are the same size and position as a vehicle or motorcycle’s tail lights.

• The system may keep operating when the Nissan Pathfinder vehicle ahead is turning right or left.

• The system may operate when own vehicle is approaching and passing a Nissan Pathfinder vehicle ahead.

• Depending on the road shape (curved road, entrance and exit of the curve, winding road, lane regulation, under construction, etc.), the system may operate temporarily for the oncoming Nissan Pathfinder vehicle in front of own vehicle.

• The AEB with pedestrian detection system may react to:

  • objects on the roadside (traffic sign, guardrail, pedestrian, cyclist, motorcycle, Nissan Pathfinder vehicle, etc.)

  • objects above road (low bridge, traffic sign, etc.)

  • objects on the road surface (railroad track, grate, steel plate, etc.)

  • objects in the parking garage (beam, pillar, etc.)

  • pedestrians, cyclists or motorcycles approaching the traveling lane

  • Nissan Pathfinder vehicles, pedestrians, cyclists, motorcycles or objects in adjacent lanes or close to the vehicle

  • oncoming pedestrians, cyclists

  • objects on the road (such as trees)

• Braking distances increase on slippery surfaces.

• Excessive noise interferes with the warning chime sound, and the chime may not be heard.

Precautions ++Steering System