2011 INFINITI QX56 Factory Service Manual

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Page 657 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-140
< REMOVAL AND INSTALLATION >[WITH VDC]
VDC OFF SWITCH
VDC OFF SWITCH
Removal and InstallationINFOID:0000000006222680
NOTE:
VDC OFF switch is integrated in SNOW MODE / TOW
MODE / VDC OFF swit

Page 658 of 5598

INFINITI QX56 2011 Factory Service Manual
PRECAUTIONSBRC-141
< PRECAUTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
PRECAUTION
PRECAUTIONS
Precautions for Preview Function ServiceINFOID:0000000006228290
CAUTI

Page 659 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-142
< SYSTEM DESCRIPTION >[BRAKE ASSIST (WITH PREVIEW FUNCTION)]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006248456
1. ICC steering switch 2. Infor

Page 660 of 5598

INFINITI QX56 2011 Factory Service Manual
COMPONENT PARTSBRC-143
< SYSTEM DESCRIPTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Component DescriptionINFOID:0000000006248457
× : Applicable
13. Steering angle

COMPONENT PARTSBRC-143
< SYSTEM DESCRIPTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Component DescriptionINFOID:0000000006248457
× : Applicable
13. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location"
14. ADAS control unit
Refer to DAS-13, "
Component Parts
Location"
A. Back side of engine room (RH) B. Front bumper (center) C. Upper side of brake pedal
D. Under side of instrument lower driver
panel
Component Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
ADAS control unit ×××× ADAS control unit calculates a target distance between vehicles
and a target speed, based on signals received from each sensor
and switch to transmit an engine torque command value to ECM
and a brake fluid pressure cont rol signal to ABS actuator and
electric unit (control unit) via CAN communication
ADAS control unit transmits buzzer output signal to combination
meter via CAN communication
ICC sensor ×××× ICC sensor detects light reflected from a vehicle ahead by irra-
diating laser forward and calculates a distance from the vehicle
ahead and a relative speed, based on the detected signal
ICC sensor transmits the presence/absence of vehicle ahead and the distance from the vehicle to ADAS control unit via ITS
communication
ECM ×××× ECM transmits the accelerator pedal position signal, ICC brake
switch signal, stop lamp switch signal, ICC steering switch sig-
nal, etc. to ADAS control unit via CAN communication
ECM controls the electric throttle control actuator based on the engine torque demand received from the ADAS control unit via
CAN communication
ABS actuator and electric unit
(control unit) ×××× ABS actuator and electric unit (c
ontrol unit) transmits the vehicle
speed signal (wheel speed), stop lamp signal and VDC/TCS/
ABS system operation condition to ADAS control unit via CAN
communication
ABS actuator and electric unit (c ontrol unit) controls the brake,
based on a brake fluid pressure control signal received from the
ADAS control unit via CAN communication
BCM ×BCM transmits the front wiper request signal to ADAS control unit
via CAN communication
TCM ××TCM transmits the signal related to A/T control to ADAS control
unit via CAN communication
Revision: 2010 May2011 QX56

Page 661 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-144
< SYSTEM DESCRIPTION >[BRAKE ASSIST (WITH PREVIEW FUNCTION)]
COMPONENT PARTS
NOTE:
Only IBA system uses
Combination meter
××××Performs the following operations using the signals received

BRC-144
< SYSTEM DESCRIPTION >[BRAKE ASSIST (WITH PREVIEW FUNCTION)]
COMPONENT PARTS
NOTE:
Only IBA system uses
Combination meter
××××Performs the following operations using the signals received from
the ADAS control unit via the CAN communication
Displays the ICC system operation status using the meter dis-
play signal
Illuminates the ICC system warning lamp using the ICC warning
lamp signal
Illuminates the IBA OFF indicator lamp using the IBA OFF indi- cator lamp signal
Operates the buzzer (ICC warning chime) using the buzzer out- put signal
ICC steering switch ×× ICC steering switch allows the ON/OFF of the Intelligent Cruise
Control and the settings of a vehicle speed and distance be-
tween vehicles
ICC steering switch signal is transmitted to ECM. ECM transmits the signal to the ADAS control unit via CAN communication
ICC brake switch ×××× ICC brake switch is turned OFF and stop lamp switch is turned
ON, when depressing the brake pedal
ICC brake switch signal is input to ECM. These signals are transmitted from ECM to ADAS control unit via CAN communi-
cation
Stop lamp switch signal is input to ECM and ABS actuator and electric unit (control unit). These signals are transmitted from
ECM and ABS actuator and electric unit (control unit) to ADAS
control unit via CAN communication
St op la mp sw i tc h
××××
ICC brake hold relay ××ICC brake hold relay activates the stop lamp by ICC brake hold re-
lay drive signal (stop lamp drive signal) outputted by the ADAS
control unit
Transfer control unit ××××Transfer control unit transmits a mode selection state of 4WD shift
switch to the ADAS control unit via CAN communication
IBA OFF switch ×
NoteIBA OFF switch signal is input to the ADAS control unit
Steering angle sensor ×Measures the rotation amount, rotation speed, and rotation direc-
tion of steering wheel, and then transmits them to ADAS control
unit via CAN communication
Component
Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
Revision: 2010 May2011 QX56

Page 662 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEM
BRC-145
< SYSTEM DESCRIPTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
SYSTEM
BRAKE ASSIST (WITH PREVIEW FUNCTION)
BRAKE ASSIST (WITH PREVIEW F UNCTION) : Syst

Page 663 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-146
< DTC/CIRCUIT DIAGNOSIS >[BRAKE ASSIST (WITH PREVIEW FUNCTION)]
BRAKE ASSIST (WITH PREVIEW FUNCTION)
DTC/CIRCUIT DIAGNOSIS
BRAKE ASSIST (WITH PR
EVIEW FUNCTION)
Diagnosis ProcedureINFOID:0000

Page 664 of 5598

INFINITI QX56 2011 Factory Service Manual
NORMAL OPERATING CONDITIONBRC-147
< SYMPTOM DIAGNOSIS > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
SYMPTOM DIAGNOSIS
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000

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