Nissan X-Trail 32. Manual - part 149

BRC-62

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

*1: CVT models
*2: 4WD models

hill start assist (UPHILL START SUPPORT) FUNCTION

hill start assist (UPHILL START SUPPORT) FUNCTION : System Description

INFOID:0000000010723641

• This function maintains brake fluid pressure so that the vehicle does not move backwards even if brake

pedal is released to depress accelerator pedal to start the vehicle while it is stopped on an uphill slope by
depressing brake pedal.

• This function operates when the vehicle is in stop status (engine running) on an uphill slope of slope ratio

10% or more, selector lever is in the position other than P or N, brake pedal is depressed and accelerator
pedal is not depressed. (CVT models)

• This function operates when the vehicle is in stop status (engine running) on an uphill slope of slope ratio

10% or more, shift lever is in the position other than neutral position, brake pedal is depressed and acceler-
ator pedal is not depressed. (M/T models)

• hill start assist indicator lamp turn ON when hill start assist function is satisfied to operational conditions.
• hill start assist indicator lamp blinks when hill start assist function is operation conditions.
• hill start assist function is only for the start aid. It maintains the brake fluid pressure for approx. 2 seconds

after releasing the brake pedal, and then decreases the pressure gradually. If the vehicle can start by the
accelerator operation, the brake is released automatically and a smooth start can be performed.

• Fail-safe function is adopted. When a malfunction occurs in hill start assist function, does not turn ON or

blink the hill start assist indicator lamp on the combination meter, 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 func-
tion, 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, 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.

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

Chassis control module

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Active trace control signal
• Active ride control 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-63

< 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
• hill start assist indicator lamp signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via 
chassis control module via CAN communication.
• hill start assist display request 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

BRC-64

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

*1: CVT models
*2: 4WD models

ADVANCED hill descent control (DOWNHILL DRIVE SUPPORT) FUNCTION

ADVANCED hill descent control (DOWNHILL DRIVE SUPPORT) FUNCTION : System 
Description

INFOID:0000000010723642

• Advanced hill descent control function is applied to 4WD models with gasoline engine.
• At a steep descent, vehicle speed is normally controlled by the driver

′

s brake operation. On the other hand,

advanced hill descent control function automatically reduces and maintains vehicle speed.

• Advanced hill descent control function starts when all of the following conditions are satisfied: hill descent

control switch is ON and, vehicle speed is 25 km/h (15.5 MPH) or less, the inclination is 10% or more and
selector lever is in the other than P and N position.

• Advanced hill descent control function is cancelled when depressing the accelerator pedal or brake pedal.

(Advanced hill descent control function restarts when releasing the accelerator pedal or brake pedal.)
NOTE:
• While driving in the forward direction, the vehicle decelerates when the brake pedal is depressed and

maintains the speed [15 km/h (9.3 MPH) or less] achieved at a brake pedal release.

• While driving in the forward direction, the vehicle accelerates when the accelerator pedal is depressed and

maintains a speed [15 km/h (9.3 MPH) or less] achieved at an accelerator pedal release.

• As for M/T models, although the hill descent control indicator lamp blinks and advanced hill descent control

function becomes deactivated when engine coolant water temperature is low, this is normal. (advanced hill
descent control function starts when engine coolant water temperature rises and hill descent control indica-
tor lamp turns ON.)

• hill descent control switch is ON and turns ON when advanced hill descent control function are operation or

satisfied to operational conditions.

• The Stop lamp of the rear combination lamp stays ON during the operation of advanced hill descent control

function.

• Slight vibrations are felt on the brake pedal and the operation noises occur, when advanced hill descent con-

trol function operates. This is not a malfunction because it is caused by advanced hill descent control func-
tion that is normally operated.

• Fail-safe function is adopted. When a malfunction occurs in advanced hill descent control function, the oper-

ation of the hill descent control switch does not turn ON or blink the hill descent control indicator lamp on the
combination meter, and the control is suspended for VDC function, TCS function, brake limited slip differen-
tial (BLSD) function, brake assist function, brake force distribution function, hill start assist function,

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

Chassis control module

Mainly receives the following signals from ABS actuator and electric unit (control unit) via 
CAN communication.
• hill start assist display request signal
Mainly transmits the following signals to combination meter via CAN communication.
• hill start assist display request 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-65

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

advanced hill descent control function, 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, 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:
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.

JSFIA2370GB