Nissan Leaf. Instruction — 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)
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