Nissan X-Trail 32. Manual - part 148

BRC-58

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

*1: CVT models
*2: 4WD models

BRAKE ASSIST FUNCTION

BRAKE ASSIST FUNCTION : System Description

INFOID:0000000010723639

• When the driver brakes hard in an emergency, the stopping distance is reduced by increasing brake fluid

pressure.

• Fail-safe function is adopted. When a malfunction occurs in brake assist function, the control is suspended

for VDC function, TCS function, brake limited slip differential (BLSD) function, brake assist function, brake
force distribution function, hill start assist function, advanced hill descent control function (4WD models with
gasoline engine), active trace control function (control of chassis control module) and active ride control
function (control of chassis control module). The vehicle status becomes the same as models without VDC
function, TCS function, brake limited slip differential (BLSD) function, brake assist function, brake force dis-
tribution function, hill start assist function, advanced hill descent control function (4WD models with gasoline
engine), active trace control function (control of chassis control module) and active ride control function (con-
trol of chassis control module). However, ABS function and EBD function are operated normally. Refer to

BRC-43, "Fail-Safe"

.

SYSTEM DIAGRAM

NOTE:
• 4WD control unit is applied to 4WD models.

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine status signal
• ECM malfunction signal

IPDM E/R

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Ignition switch ON signal

BCM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Stop lamp switch signal
• Brake pedal position switch signal
• Cranking signal
• Ignition switch ON signal

Electric parking brake control module

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Electric parking brake operation signal

4WD control unit

*2

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• 4WD malfunction signal
• 4WD operation signal

Steering angle sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Steering angle sensor signal

Component parts

Signal description

SYSTEM

BRC-59

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

• TCM is applied to CVT models.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

JSFIA2367GB

Component parts

Signal description

Combination meter

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Parking brake switch signal
• Brake fluid level switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via 
CAN communication.
• ABS warning lamp signal
• VDC OFF indicator lamp signal
• VDC warning lamp signal
• Brake warning lamp signal

TCM

*1

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• N range signal
• P range signal
• R range signal
• Current gear position signal
• Shift position signal
• TCM malfunction signal

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine status signal
• ECM malfunction signal

IPDM E/R

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Ignition switch ON signal

BRC-60

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

*1: CVT models
*2: 4WD models

BRAKE FORCE DISTRIBUTION FUNCTION

BRAKE FORCE DISTRIBUTION FUNCTION : System Description

INFOID:0000000010723640

• Brake force distribution function helps provide a more stable and

secure feeling.

• During cornering, when brake operation is performed brake fluid

pressure of each wheel is controlled based on steering operation
amount by the driver and vehicle cornering status amount detected
by each sensor.

• Fail-safe function is adopted. When a malfunction occurs in brake

force distribution function, the control is suspended for VDC func-
tion, TCS function, brake limited slip differential (BLSD) function,
brake assist function, brake force distribution function, hill start
assist function, advanced hill descent control function (4WD mod-
els with gasoline engine), active trace control function (control of
chassis control module) and active ride control function (control of
chassis control module). The vehicle status becomes the same as
models without VDC function, TCS function, brake limited slip differential (BLSD) function, brake assist func-
tion, brake force distribution function, hill start assist function, advanced hill descent control function (4WD
models with gasoline engine), active trace control function (control of chassis control module) and active ride
control function (control of chassis control module). However ABS function and EBD function are operated
normally. Refer to 

BRC-43, "Fail-Safe"

.

NOTE:
Brake force distribution function may not always be operates in all driving conditions.

SYSTEM DIAGRAM

NOTE:
• 4WD control unit is applied to 4WD models.

BCM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Stop lamp switch signal
• Brake pedal position switch signal
• Cranking signal
• Ignition switch ON signal

Electric parking brake control module

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Electric parking brake operation signal

4WD control unit

*2

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• 4WD malfunction signal
• 4WD operation signal

Steering angle sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Steering angle sensor signal

Component parts

Signal description

JPFIC0171GB

JPFIC0172GB

SYSTEM

BRC-61

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

• TCM is applied to CVT models.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

JSFIA2369GB

Component parts

Signal description

Combination meter

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Parking brake switch signal
• Brake fluid level switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via 
CAN communication.
• ABS warning lamp signal
• VDC OFF indicator lamp signal
• VDC warning lamp signal
• Brake warning lamp signal

TCM

*1

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• N range signal
• P range signal
• R range signal
• Current gear position signal
• Shift position signal
• TCM malfunction signal

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine status signal
• ECM malfunction signal

IPDM E/R

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Ignition switch ON signal