2011 INFINITI QX56 Factory Service Manual

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Page 529 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-12
< SYSTEM DESCRIPTION >[WITH VDC]
COMPONENT PARTS
1. Transfer control unit
Refer to DLN-10, "
Component Parts
Location". 2. ECM
Refer to EC-16, "
Component Parts
Location". 3. Control valve

Page 530 of 5598

INFINITI QX56 2011 Factory Service Manual
COMPONENT PARTSBRC-13
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Component DescriptionINFOID:0000000006222560
*1: Models with Advanced Driver Assistance System
*2: Models wit

Page 531 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-14
< SYSTEM DESCRIPTION >[WITH VDC]
COMPONENT PARTS
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000006222561
Electric unit (control unit) is in tegrated with actuator and motor/accu

BRC-14
< SYSTEM DESCRIPTION >[WITH VDC]
COMPONENT PARTS
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000006222561
Electric unit (control unit) is in tegrated with actuator and motor/accumulator assembly and comprehensively
controls VDC function, TCS function, AB S 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 fr om 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 fr om ABS actuator and electric unit (control unit).
Actuator Relay (Main Relay)
Operates each valve ON/OFF according to signals fr om 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 accu mulator pressure to the front system, according to a
signal transmitted from the ABS actuat or and electric unit (control unit).
Suction Valve 2
Suction valve 2 releases accumulator pressure, accord ing 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 act uator 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 RotorINFOID: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.
Revision: 2010 May2011 QX56

Page 532 of 5598

INFINITI QX56 2011 Factory Service Manual
COMPONENT PARTSBRC-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.

COMPONENT PARTSBRC-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 pr oportional to wheel speed.
Stop Lamp SwitchINFOID:0000000006222563
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Steering Angle SensorINFOID: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 sensorINFOID:0000000006222565
Calculates the following information that affects the v ehicle 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 SwitchINFOID:0000000006222566
Detects the brake fluid level in reservoir tank and trans mits converted electric signal from ABS actuator and
electric unit (control unit), when brake fluid level is the specified level or less.
Parking Brake SwitchINFOID: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 SwitchINFOID: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 arbi trary 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 differentia l (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
Revision: 2010 May2011 QX56

Page 533 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-16
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
SYSTEM
System DescriptionINFOID:0000000006222569
The system switches fluid pressure of each brake caliper to increase, to hold or to decrease accordin

Page 534 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-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/decal G s ensor and ABS actuator and electric unit (control unit)
*2: Mode

Page 535 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-18
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
Front RH caliper
Pressurized brake fluid from accumulator is supplied
to front RH caliper through master cylinder part, cut
valve 1 and ABS IN valve.

Page 536 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-19
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Front RH caliper
Pressurized brake fluid from accumulator is supplied to front RH caliper through master cylinder p

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