Nissan Versa Note. Instruction — part 111
BRC-8
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
COMPONENT PARTS
Component Description
INFOID:0000000009364880
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000009364881
Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS func-
tion, ABS function and EBD function.
ELECTRIC UNIT (CONTROL UNIT)
• Brake fluid pressure is controlled according to signals from each sensor.
• If malfunction is detected, the system enters fail-safe mode.
ACTUATOR
The following components are integrated with ABS actuator.
Pump
Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).
Motor Relay
Operates the motor ON/OFF according to signals from ABS actuator and electric unit (control unit).
Actuator Relay (Main Relay)
Operates each valve ON/OFF according to signals from ABS actuator and electric unit (control unit).
ABS IN Valve
Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT Valve
Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Cut Valve 1, Cut Valve 2
Shuts off the ordinary brake line from master cylinder, when VDC function and TCS function are activated.
Suction Valve 1, Suction Valve 2
Supplies the brake fluid from master cylinder to the pump, when VDC function and TCS function are activated.
Return Check Valve
Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each
valve when brake is released.
Reservoir
A.
View with steering wheel and spiral
cable removed
B.
Left side of instrument panel
C.
Left side of engine compartment
D.
Left side of engine compartment
E.
Right side of engine compartment
F.
Left front wheel assembly
G.
Near brake pedal area
H.
View with console removed
I.
Left rear wheel assembly
Component
Reference/Function
1
Steering angle sensor
BRC-9, "Steering Angle Sensor"
2
VDC OFF switch
3
IPDM E/R
PCS-5, "Component Parts Location"
4
Brake fluid level switch
BRC-9, "Brake Fluid Level Switch"
5
ABS actuator and electric unit (control unit)
BRC-8, "ABS Actuator and Electric Unit (Control Unit)"
6
Front wheel sensor
BRC-9, "Wheel Sensor and Sensor Rotor"
7
Stop lamp switch
8
Parking brake switch
9
Rear wheel sensor
BRC-9, "Wheel Sensor and Sensor Rotor"
10
Combination meter
COMPONENT PARTS
BRC-9
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when
decreasing pressure of brake caliper and wheel cylinder.
Yaw rate/side/decel G sensor
Calculates the following information that affects the vehicle, and transmits a signal to ABS actuator and elec-
tric unit (control unit) via communication lines.
• Vehicle rotation angular velocity (yaw rate signal)
• Vehicle lateral acceleration (side G signal) and longitudinal acceleration (decel G signal)
Pressure Sensor
Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Wheel Sensor and Sensor Rotor
INFOID:0000000009364882
NOTE:
• Wheel sensor of front wheel is installed on steering knuckle.
• Sensor rotor of front wheel is integrated in wheel hub assembly.
• Wheel sensor of rear wheel is installed on back plate of rear brake.
• Sensor rotor of rear wheel is installed on rear brake drum.
• Never measure resistance and voltage value using a tester because sensor is active sensor.
• Downsize and weight reduction is aimed. IC for detection portion
and magnet for sensor rotor are adopted.
• Power supply is supplied to detection portion so that magnetic field
line is read. Magnetic field that is detected is converted to current
signal.
• When sensor rotor rotates, magnetic field changes. Magnetic field
change is converted to current signals (rectangular wave) and is
transmitted to ABS actuator and electric unit (control unit). Change
of magnetic field is proportional to wheel speed.
Stop Lamp Switch
INFOID:0000000009364883
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Steering Angle Sensor
INFOID:0000000009364884
Detects the following information and transmits steering angle signal to ABS actuator and electric unit (control
unit) via CAN communication.
• Steering wheel rotation amount
• Steering wheel rotation angular velocity
• Steering wheel rotation direction
VDC OFF Switch
INFOID:0000000009364885
• Non-operational status or standby status of VDC and TCS functions can be selected using VDC OFF switch.
VDC OFF indicator lamp indicates the operation status of function. (ON: Non-operational status, OFF:
Standby status)
• VDC OFF indicator lamp turns OFF (standby status) when the engine is started again after it is stopped once
while VDC OFF indicator lamp is ON (non-operational status).
Brake Fluid Level Switch
INFOID:0000000009364886
Detects the brake fluid level in reservoir tank and transmits converted electric signal from combination meter to
ABS actuator and electric unit (control unit) via CAN communication.
Parking Brake Switch
INFOID:0000000009364887
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.
JPFIC0131GB
BRC-10
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
SYSTEM
VDC/TCS/ABS
VDC/TCS/ABS : System Diagram
INFOID:0000000009364888
VDC/TCS/ABS : System Description
INFOID:0000000009364889
• The system switches fluid pressure of each brake caliper and each wheel cylinder 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, TCS, ABS and EBD functions.
• Fail-safe function is available for each function and is activated by each function when system malfunction
occurs.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
AWFIA0806GB
SYSTEM
BRC-11
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VALVE OPERATION (VDC AND TCS FUNCTIONS)
The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-
ipers by operating each valve.
VDC and TCS Functions are Operating (Pressure Increases)
Component
Signal description
Steering angle sensor
Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
ECM
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM
Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• Parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• ABS warning lamp signal
• Brake warning lamp signal
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
JSFIA0670GB
Name
Not activated
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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