Nissan Leaf. Manual - part 306

BRC-14

< SYSTEM DESCRIPTION >

[WITH VDC]

COMPONENT PARTS

Brake Pedal Position Switch

INFOID:0000000010120024

Detects the operation status of brake pedal and transmits converted

electric signal to ABS actuator and electric unit (control unit).

Steering Angle Sensor

INFOID:0000000010120025

Detects the following information and transmits steering angle signal

to ABS actuator and electric unit (control unit) via CAN communica-

tion:

• Steering wheel rotation amount

• Steering wheel rotation angular velocity

• Steering wheel rotation direction

Yaw Rate/Side/Decel G Sensor

INFOID:0000000010120026

Calculates the following information that affects the vehicle, and

transmits a signal to ABS actuator and electric unit (control unit) via

communication lines:

• Vehicle rotation angular velocity (yaw rate signal)

• Vehicle lateral acceleration (side G signal) and longitudinal accel-

eration (decel G signal)

Brake Fluid Level Switch

INFOID:0000000010120027

Detects the brake fluid level in reservoir tank and transmits con-

verted electric signal from combination meter to ABS actuator and

electric unit (control unit) via CAN communication, when brake fluid

level is the specified level or less.

JSFIA1144ZZ

JSFIA1145ZZ

JSFIA1146ZZ

JSFIA1833ZZ

COMPONENT PARTS

BRC-15

< SYSTEM DESCRIPTION >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Parking Brake Switch

INFOID:0000000010120028

Detects the operation status of parking brake switch and transmits

converted electric signal from combination meter to ABS actuator

and electric unit (control unit) via CAN communication.

VDC OFF Switch

INFOID:0000000010120029

• Non-operational status or standby status of the following functions

can be selected using VDC OFF switch. VDC OFF indicator lamp

indicates the operation status of function (ON: Non-operational sta-

tus, OFF: Standby status):

- VDC function

- TCS function

NOTE:

Brake limited slip differential (BLSD) function control operates:

• VDC OFF indicator lamp turns OFF (standby status) when the

READY is started again after it is stopped once while VDC OFF

indicator lamp is ON (non-operational status).

JSFIA1627ZZ

JSFIA1148ZZ

BRC-16

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

SYSTEM

System Description

INFOID:0000000010120030

• The system switches fluid pressure of each brake caliper to increase, to hold or to decrease according to

signals from control unit in ABS actuator and electric unit (control unit). This control system is applied to

VDC function, TCS function, ABS function, EBD function, brake limited slip differential (BLSD) function and

brake assist function.

• If a malfunction occurs in the electrically-driven intelligent brake unit, the VDC function performs control

(boost operation).

• Fail-safe function is available for each function and is activated by each function when system malfunction

occurs.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

JSFIA2064GB

Component

Signal description

Yaw rate/side/decel G sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via com-
munication line

*1

:

• Yaw rate signal
• Side G sensor signal
• Decel G sensor signal

VCM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication:
• Accelerator pedal position signal
• VCM control signal
• Shift position signal

Electrically-driven intelligent brake

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication and brake communication line

*2

:

• Electrically-driven intelligent brake control signal
• Brake warning lamp request signal
• Brake system warning lamp request signal

SYSTEM

BRC-17

< SYSTEM DESCRIPTION >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

*1: Communication line between yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit)

*2: CAN communication line between electrically-driven intelligent brake unit and ABS actuator and electric

unit (control unit)

VALVE OPERATION [VDC FUNCTION, TCS FUNCTION, BRAKE LIMITED SLIP DIFFERENTIAL
(BLSD) FUNCTION AND BRAKE ASSIST FUNCTION

The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-

ipers, respectively, by operating each valve.

When VDC Function, TCS Function, Brake Limited Slip Differential (BLSD) Function and Brake Assist Function are
in Operation (During Pressure Increases)

Steering angle sensor

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

Combination meter

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

Component

Signal description

JSFIA1835GB

Name

Not activated

During pressure increases

Cut valve 1

Power supply is not supplied (open)

Power supply is supplied (close)

Cut valve 2

Power supply is not supplied (open)

Power supply is supplied (close)

Suction valve 1

Power supply is not supplied (close)

Power supply is supplied (open)

Suction valve 2

Power supply is not supplied (close)

Power supply is supplied (open)

ABS IN valve

Power supply is not supplied (open)

Power supply is not supplied (open)