Nissan X-Trail 32. Manual - part 147

BRC-54

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

• The following effects are obtained by preventing wheel lock during

braking.

- Vehicle tail slip is prevented during braking when driving straight.
- Understeer and oversteer tendencies are moderated during brak-

ing driving on a corner.

- Obstacles may be easily bypassed by steering operation during

braking.

• CONSULT can be used to diagnose the system diagnosis.
• Fail-safe function is adopted. When a malfunction occurs in ABS

function, the control is suspended for VDC function, TCS function,
ABS 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, ABS 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). However, EBD
function is operated normally. Refer to 

BRC-43, "Fail-Safe"

.

NOTE:

• ABS function has the characteristic as described here, This is not the device that helps reckless driving.
• To stop vehicle efficiently, ABS does not operate and ordinary brake operates at low speed [approx. 10 km/h

(6 MPH) or less, but differs subject to road conditions).

• Self-diagnosis is performed immediately after when engine starts and when vehicle initially is driven [by vehi-

cle speed approx. 15 km/h (9 MPH)]. Motor sounds are generated during self-diagnosis. In addition, brake
pedal may be felt heavy when depressing brake pedal lightly. These symptoms are not malfunctions.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

JPFIC0140GB

JSFIA2368GB

SYSTEM

BRC-55

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

E

G

H

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A

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BRC

N

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EBD FUNCTION

EBD FUNCTION : System Description

INFOID:0000000010723637

• By preventing rear wheel slip increase through rear wheel brake force (brake fluid pressure) control that is

electronically controlled when slight skip on front and rear wheels are detected during braking, stability dur-
ing braking is improved.

• EBD function is expanded and developed from conventional ABS function and corrects rear wheel brake

force to appropriate level by electronic control according to load weight (number of passengers).

• During braking, control unit portion compares slight slip on front

and rear wheels by wheel speed sensor signal, transmits drive sig-
nal to actuator portion when rear wheel slip exceeds front wheel
slip for the specified value or more, and controls rear wheel brake
force (brake fluid pressure) so that increase of rear wheel slip is
prevented and slips on front wheel and rear wheel are nearly
equalized. ABS control is applied when slip on each wheel
increases and wheel speed is the threshold value of ABS control or
less.

• CONSULT can be used to diagnose the system diagnosis.
• Fail-safe function is adopted. When a malfunction occurs in EBD

function, the control is suspended for VDC function, TCS function,
ABS function, EBD 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, ABS function, EBD
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). Refer to 

BRC-43, "Fail-Safe"

.

Component parts

Signal description

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication.
• VDC warning lamp signal
• ABS warning lamp signal

BCM

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

JPFIC0142GB

JPFIC0143GB

BRC-56

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

SYSTEM DIAGRAM

INPUT SIGNAL AND OUPUT SIGNAL

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

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD) FUNCTION

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD) FUNCTION : System Description

INFOID:0000000010723638

• LH and RH driving wheel spin is always monitored. If necessary, appropriate brake force is independently

applied to LH or RH driving wheel so that one-sided wheel spin is avoided and traction is maintained. Mainly
starting ability is improved.

• Brake limited slip differential (BLSD) function operates while VDC function is in non-operational status (OFF)

by VDC OFF switch.

• VDC warning lamp blinking while brake limited slip differential (BLSD) function is in operation and indicates

to the driver that the function is in operation.

• Slight vibrations are felt on the brake pedal and the operation noises occur, when brake limited slip differen-

tial (BLSD) function operates. This is not a malfunction because it is caused by brake limited slip differential
(BLSD) function that is normally operated.

• Fail-safe function is adopted. When a malfunction occurs in brake limited slip differential (BLSD) 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 func-

JSFIA2368GB

Component parts

Signal description

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication.
• VDC warning lamp signal
• ABS warning lamp signal
• Brake warning lamp signal

BCM

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

SYSTEM

BRC-57

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

E

G

H

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A

B

BRC

N

O

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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"

.

SYSTEM DIAGRAM

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