Nissan X-Trail 32. Manual - part 191

BRC-230

< SYSTEM DESCRIPTION >

[FORWARD EMERGENCY BRAKING]

COMPONENT PARTS

Back side of front bumper

JSOIA1637ZZ

No.

Component parts

Function

Steering angle sensor

Steering angle sensor signal is transmitted to distance sensor via CAN 
communication.

Combination meter

• Performs the following operations using the signals received from the 

distance sensor via the CAN communication

- Description: Displays the FEB operation status
- System display and warning: 

BRC-238, "Menu Displayed by Pressing 

Each Switch"

• Refer to 

MWI-7, "METER SYSTEM : Component Parts Location"

 for 

detailed installation location.

Stop lamp switch

Stop lamp switch is installed at the upper part of the brake pedal and 
detects a brake operation performed by the driver.

TCM

• CVT control related signal is transmitted to distance sensor via CAN 

communication.

• Refer to 

TM-235, "CVT CONTROL SYSTEM : Component Parts Lo-

cation"

 for detailed installation location. (Gasoline engine models)

• Refer to 

TM-466, "CVT CONTROL SYSTEM : Component Parts Lo-

cation"

 for detailed installation location. (Diesel engine models)

ECM

• When Forward Emergency Braking operates, an engine torque down 

request signal is received from the distance sensor.

• Refer to 

EC-28, "ENGINE CONTROL SYSTEM : Component Parts 

Location"

 for detailed installation location. (MR20DD engine models)

• Refer to 

EC-440, "Component Parts Location"

 for detailed installa-

tion location. (QR25DE engine models)

• Refer to 

EC-812, "Component Parts Location"

 for detailed installation 

location. (R9M engine models)

ABS actuator and electric unit (control unit)

• Vehicle speed signal and the operation statuses of the VDC, TCS and 

ABS systems, etc. are transmitted to the distance sensor via CAN 
communication.

• Refer to 

BRC-14, "Component Parts Location"

 for detailed installation 

location.

COMPONENT PARTS

BRC-231

< SYSTEM DESCRIPTION >

[FORWARD EMERGENCY BRAKING]

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Distance Sensor

INFOID:0000000010727967

• Distance sensor is installed on the back of the front bumper and

detects a vehicle ahead by using millimeter waves.

• Distance sensor detects radar reflected from a vehicle ahead by

irradiating radar forward and calculates a distance from the vehicle
ahead and relative speed, based on the detected signal.

• When judging the danger of crash according to the distance from

the vehicle ahead and the relative speed, the distance sensor
transmits a signal to ABS actuator and electric unit (control unit).

Stop Lamp Switch

INFOID:0000000010727968

• Stop lamp switch is installed at the upper part of the brake pedal

and detects a brake operation performed by the driver.

• Stop lamp switch is turned ON, when depressing the brake pedal.
• Stop lamp switch signal is input to BCM. Stop lamp switch signals

are transmitted from BCM to distance sensor via CAN communica-
tion.

BCM

• Stop lamp switch signal is transmitted to the distance sensor via CAN 

communication.

• Refer  to 

BCS-6, "BODY CONTROL SYSTEM : Component Parts Lo-

cation"

 for detailed installation location.

Chassis control unit

• Brake fluid pressure control signal is received from distance sensor 

via chassis communication.

• Brake fluid pressure control signal is transmitted to ABS actuator 

electric unit (control unit) via CAN communication.

• Refer  to 

DAS-166, "Component Parts Location"

 for detailed installa-

tion location.

Sonar control unit

• While Forward Emergency Braking is operating, when the system 

wants to recommend an operation to the driver, and when the system 
is canceled, a buzzer sounds due to a sonar output request from the 
distance sensor. 

• Refer  to 

SN-8, "Component Parts Location"

 for detailed installation 

location. (With Park Assist)

• Refer  to 

SN-119, "Component Parts Location"

 for detailed installation 

location. (Without Park Assist)

Distance sensor

Distance sensor detects radar reflected from a vehicle ahead by irradi-
ating radar forward and calculates a distance from the vehicle ahead 
and relative speed, based on the detected signal.

No.

Component parts

Function

JSOIA1619ZZ

JSOIA0439ZZ

BRC-232

< SYSTEM DESCRIPTION >

[FORWARD EMERGENCY BRAKING]

SYSTEM

SYSTEM

System Description

INFOID:0000000010721664

SYSTEM DIAGRAM

DISTANCE SENSOR INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

JSOIA1621GB

Transmit unit

Signal name

Description

ECM

CAN com-
munica-
tion

Closed throttle position signal

Receives idle position state (ON/OFF)

Accelerator pedal position signal

Receives accelerator pedal position (angle)

Engine speed signal

Receives engine speed

TCM

CAN com-
munica-
tion

Input speed signal

Receives the number of revolutions of input shaft

Current gear position signal

Receives a current gear position

Shift position signal

Receives a selector lever position

Output shaft revolution signal

Receives the number of revolutions of output shaft

BCM

CAN com-
munica-
tion

Stop lamp switch signal

Receives an operational state of the brake pedal

SYSTEM

BRC-233

< SYSTEM DESCRIPTION >

[FORWARD EMERGENCY BRAKING]

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Output Signal Item

DESCRIPTION

• Forward emergency braking (FEB) system can assist the driver when there is a risk of a forward collision

with the vehicle ahead in the traveling lane.

• FEB system operate at speeds above approximately 5km/h (3 MPH).

FUNCTION DESCRIPTION

• The FEB system uses a distance sensor to measure the distance to the vehicle ahead in the traveling lane.
• If there is a risk of a collision, FEB issues a visual and audible warning signal to the combination meter via

CAN communication.

• If the driver does not take action, FEB issues the second visual and audible warning.
• And if the risk of a collision becomes imminent, FEB system applies braking command to ABS actuator and

electric unit (control unit) via CAN communication.

FEB Operating Condition

• FEB setting is ON (FEB warning lamp OFF)
• Vehicle speed: Approximately 5km/h and above

ABS actuator 
and electric unit 
(control unit)

CAN com-
munica-
tion

ABS malfunction signal

Receives a malfunction state of ABS

ABS operation signal

Receives an operational state of ABS

ABS warning lamp signal

Receives an ON/OFF state of ABS warning lamp

TCS malfunction signal

Receives a malfunction state of TCS

TCS operation signal

Receives an operational state of TCS

VDC OFF switch signal

Receives an ON/OFF state of VDC

VDC malfunction signal

Receives a malfunction state of VDC

VDC operation signal

Receives an operational state of VDC

Vehicle speed signal (ABS)

Receives wheel speeds of four wheels

Yaw rate signal

Receives yaw rate acting on the vehicle

Steering angle 
sensor

CAN com-
munica-
tion

Steering angle sensor signal

Receives the number of revolutions, turning direction, 
turning angle speed of the steering wheel

Combination 
meter

CAN com-
munica-
tion

System selection signal

Receives a selection state of Forward Emergency 
Brake

Stop lamp 
switch

Stop lamp switch signal

Transmits a operational state of the brake pedal to the 
BCM

Transmit unit

Signal name

Description

Reception unit

Signal name

Description

ECM

CAN commu-
nication

Engine torque down request signal

Transmits a signal to control the engine torque.

ABS actuator 
and electric 
unit (control 
unit)

CAN commu-
nication

Brake fluid pressure control signal

Transmits a brake fluid pressure control signal to acti-
vates the brake via chassis control module

Combination 
meter

CAN commu-
nication

Meter display 
signal

Vehicle ahead detection 
indicator signal

Transmits a signal to display a state of the system on the 
information display via front camera unit

FEB system display sig-
nal

FEB warning signal

FEB warning lamp signal

Transmits a signal to illuminate the FEB warning lamp

BCM

CAN commu-
nication

Stop lamp drive signal

Transmits a signal to active the stop lamp.

Sonar control 
unit

CAN commu-
nication

Buzzer drive signal

Transmits a buzzer signal to active the buzzer