Nissan Note E12. Instruction — part 79
COMPONENT PARTS
BRC-7
< SYSTEM DESCRIPTION >
[ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Component Description
INFOID:0000000009365050
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000009365051
Electric unit (control unit) is integrated with actuator and comprehensively controls 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.
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
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when
decreasing pressure of brake caliper and wheel cylinder.
Wheel Sensor and Sensor Rotor
INFOID:0000000009365052
NOTE:
• Wheel sensor of front wheel is installed on steering knuckle.
A
Parking brake switch
(view with console removed)
B
Combination meter
C
IPDM E/R
D
Brake fluid level switch
(view with IPDM E/R removed)
E
ABS actuator and electric unit (con-
trol unit)
F
Front wheel sensor
G
Stop lamp switch
H
Rear wheel sensor
No.
Component
Reference/Function
1
Parking brake switch
2
Combination meter
MWI-6, "METER SYSTEM : Combination Meter"
3
IPDM E/R
PCS-4, "Component Parts Location"
4
Brake fluid level switch
BRC-8, "Brake Fluid Level Switch"
5
ABS actuator and electric unit (con-
trol unit)
BRC-7, "ABS Actuator and Electric Unit (Control Unit)"
6
Front wheel speed sensor
BRC-7, "Wheel Sensor and Sensor Rotor"
7
Stop lamp switch
8
Rear wheel speed sensor
BRC-8
< SYSTEM DESCRIPTION >
[ABS]
COMPONENT PARTS
• 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:0000000009365053
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Brake Fluid Level Switch
INFOID:0000000009365056
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:0000000009365057
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
SYSTEM
BRC-9
< SYSTEM DESCRIPTION >
[ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
SYSTEM
ABS
ABS : System Diagram
INFOID:0000000009365058
ABS : System Description
INFOID:0000000009365059
• 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 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.
VALVE OPERATION (ABS AND EBD FUNCTIONS)
The control unit built into the ABS actuator and electric unit (control unit) controls fluid pressure of the brake
calipers by operating each valve.
ALFIA0392GB
Component
Signal description
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
BRC-10
< SYSTEM DESCRIPTION >
[ABS]
SYSTEM
Brake Pedal Applied or ABS Function Operating (Pressure Increases)
Front RH brake caliper
• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the front RH brake caliper from
the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS
OUT valve is closed.
Front LH brake caliper
• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the front LH brake caliper from
the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS
OUT valve is closed.
Rear RH wheel cylinder
• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the rear RH wheel cylinder from
the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS
OUT valve is closed.
Rear LH wheel cylinder
• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the rear LH wheel cylinder from
the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS
OUT valve is closed.
JSFIA0679GB
Name
Not activated
During pressure increases
Cut valve 1
Power supply is not supplied (open)
Power supply is not supplied (open)
Cut valve 2
Power supply is not supplied (open)
Power supply is not supplied (open)
Suction valve 1
Power supply is not supplied (close)
Power supply is not supplied (close)
Suction valve 2
Power supply is not supplied (close)
Power supply is not supplied (close)
ABS IN valve
Power supply is not supplied (open)
Power supply is not supplied (open)
ABS OUT valve
Power supply is not supplied (close)
Power supply is not supplied (close)
Each brake caliper and each wheel cylinder
(fluid pressure)
—
Pressure increases
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