Infiniti QX56 (Z62). Manual — part 132
COMPONENT PARTS
BRC-13
< SYSTEM DESCRIPTION >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Component Description
INFOID:0000000006222560
*1: Models with Advanced Driver Assistance System
*2: Models with 4WD system
D.
ABS warning lamp, brake warning
lamp, VDC warning lamp, VDC OFF
indicator lamp
E.
Back of spiral cable assembly
F.
Center console assembly
G.
Under center console assembly
H.
Rear wheel hub and bearing assem-
bly
Component
Reference/Function
ABS actuator and electric unit
(control unit)
Motor/accumulator assembly
BRC-14, "ABS Actuator and Electric Unit (Control Unit)"
Motor relay
Actuator relay (main relay)
ABS IN valve
ABS OUT valve
Cut valve 1
Cut valve 2
Suction valve 1
Suction valve 2
Control pressure sensor
*1
Accumulator pressure sensor
Master cylinder pressure sensor
Wheel sensor
BRC-14, "Wheel Sensor and Sensor Rotor"
Stop lamp switch
Steering angle sensor
BRC-15, "Steering Angle Sensor"
Yaw rate/side/decel G sensor
BRC-15, "Yaw Rate/Side/Decel G sensor"
Brake fluid level switch
BRC-15, "Brake Fluid Level Switch"
Parking brake switch
BRC-15, "Parking Brake Switch"
VDC OFF switch
ECM
Mainly transmits the following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
• Accelerator pedal position signal
• Engine speed signal
Mainly receives the following signals from ABS actuator and
electric unit (control unit) via CAN communication.
• Target throttle position signal
TCM
Mainly transmits the following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
• Shift position signal
• Current gear position signal
Transfer control unit
*2
Mainly transmits the following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
• Current 4WD mode signal
ABS warning lamp
Brake warning lamp
VDC warning lamp
VDC OFF indicator lamp
BRC-14
< SYSTEM DESCRIPTION >
[WITH VDC]
COMPONENT PARTS
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000006222561
Electric unit (control unit) is integrated with actuator and motor/accumulator assembly and comprehensively
controls VDC function, TCS function, ABS function, EBD function, hill start assist function or brake limited slip
differential function.
ELECTRIC UNIT (CONTROL UNIT)
• Brake fluid pressure, engine and transmission are 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.
Motor/accumulator Assembly
Pump
• Operates the pump drive according to signals from ABS actuator and electric unit (control unit) by the motor.
Motor
• Operates the motor drive according to signals from ABS actuator and electric unit (control unit).
Accumulator
• The accumulator accumulates brake fluid conveyed by the motor and pump.
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 and ABS OUT Valve
Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and
electric unit (control unit).
Cut Valve 1, Cut Valve 2
Shuts off the ordinary brake line from master cylinder to signals from ABS actuator and electric unit (control
unit).
Suction Valve 1
Suction Valve 1 switches the brake path to convey accumulator pressure to the front system, according to a
signal transmitted from the ABS actuator and electric unit (control unit).
Suction Valve 2
Suction valve 2 releases accumulator pressure, according to a signal transmitted from the ABS actuator and
electric unit (control unit).
Control Pressure Sensor (models with Advanced Driver Assistance System)
Detects the brake fluid pressure of brake caliper side and transmits a signal to ABS actuator and electric unit
(control unit).
Accumulator Pressure Sensor
The accumulator pressure sensor detects brake fluid pressure accumulated in the accumulator and conveys
the detected result to the ABS actuator and electric unit (control unit).
Master cylinder Pressure Sensor
Detects the brake fluid pressure of master cylinder part and transmits a signal to ABS actuator and electric unit
(control unit).
Wheel Sensor and Sensor Rotor
INFOID:0000000006222562
NOTE:
• Wheel sensor and sensor rotor is integrated in wheel hub assembly.
• Never measure resistance and voltage value using a tester because sensor is active sensor.
COMPONENT PARTS
BRC-15
< SYSTEM DESCRIPTION >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
• 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:0000000006222563
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:0000000006222564
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
Yaw Rate/Side/Decel G sensor
INFOID:0000000006222565
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) / longitudinal acceleration (decel G signal)
Brake Fluid Level Switch
INFOID:0000000006222566
Detects the brake fluid level in reservoir tank and transmits converted electric signal from ABS actuator and
electric unit (control unit), when brake fluid level is the specified level or less.
Parking Brake Switch
INFOID:0000000006222567
Detects the operation status of parking brake switch and transmits converted electric signal from combination
meter to ABS actuator and electric unit (control unit).
VDC OFF Switch
INFOID:0000000006222568
• VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
• The operation of the VDC OFF switch enables the arbitrary switching of the VDC function between stop sta-
tus and standby status. The status of the function is indicated by the VDC OFF indicator lamp. (ON: Non-
operational status, OFF: Standby status)
- VDC function
NOTE:
Brake limited slip differential (BLSD) control operates.
- TCS function
• 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).
JPFIC0131GB
BRC-16
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
SYSTEM
System Description
INFOID:0000000006222569
• 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, hill start assist function and brake limited slip dif-
ferential (BLSD) function
• Fail-safe function is available for each function and is activated by each function when system malfunction
occurs.
• The adoption of the 4WD switch assembly (4WD shift switch and VDC OFF switch) enables to change the
control characteristics of the VDC function, the TCS function and the brake limited slip differential (BLSD)
function into an optimal characteristics, based on a state of the 4WD shift switch. (Models with 4WD system)
SYSTEM DIAGRAM
NOTE:
Transfer control unit is applied to models with 4WD system.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JPFIC0182GB
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
ECM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Accelerator pedal position signal
• Engine speed signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Target throttle position signal
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