INFINITI QX56 2011 Factory Service Manual

BRC-134
< REMOVAL AND INSTALLATION >[WITH VDC]
WHEEL SENSOR
REMOVAL AND INSTALLATION
WHEEL SENSOR
FRONT WHEEL SENSOR
FRONT WHEEL SENSOR : Exploded ViewINFOID:0000000006222670
CAUTION:
Replace wheel hub and bearing
assembly as an assembly when repl acing because wheel sensor can-
not be disassembled.
NOTE:
Front RH wheel sensor is symmetrically opposite of LH.
FRONT WHEEL SENSOR : Removal and InstallationINFOID:0000000006222671
CAUTION:
Replace wheel hub and bearing assembly as an assembly when repl acing because wheel sensor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18,
"Removal and Installation" (4WD).
CAUTION:
Never twist or pull front wheel sensor harness.
INSTALLATION
Note the following, and install in the reverse order of the removal.
1. Front LH wheel sensor harness con-
nector 2. Front LH wheel sensor 3. Bracket
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JPFIC0199GB
Revision: 2010 May2011 QX56

WHEEL SENSORBRC-135
< REMOVAL AND INSTALLATION > [WITH VDC]
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 Never twist front wheel sensor harness when installi ng front wheel sensor. Check that grommet is fully
inserted to bracket. Check that front wheel sensor harness is not twisted after installation.
 Check that front wheel sensor identificat ion line face toward the vehicle rear.
REAR WHEEL SENSOR
REAR WHEEL SENSOR : Exploded ViewINFOID:0000000006222672
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because wheel sensor can-
not be disassembled.
NOTE:
Rear RH wheel sensor is symmetrically opposite of LH.
REAR WHEEL SENSOR : Re moval and InstallationINFOID:0000000006222673
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because wheel sensor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to RAX-7, "Removal and Installation".
CAUTION:
Never twist or pull rear wheel sensor harness.
INSTALLATION
Note the following, and install in the reverse order of the removal.
Never twist rear wheel sensor harness when installing rear wheel sensor. Check that grommet is fully inserted
to bracket. Check that rear wheel sensor harness is not twisted after installation.
1. Rear LH wheel sensor harness con-
nector 2. Rear LH wheel sensor 3. Bracket
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JPFIC0200GB
Revision: 2010 May2011 QX56

BRC-136
< REMOVAL AND INSTALLATION >[WITH VDC]
SENSOR ROTOR
SENSOR ROTOR
FRONT SENSOR ROTOR
FRONT SENSOR ROTOR : Re
moval and InstallationINFOID:0000000006222674
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because sensor rotor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18,
"Removal and Installation" (4WD).
INSTALLATION
Install wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18, "Removal
and Installation" (4WD).
REAR SENSOR ROTOR
REAR SENSOR ROTOR : Removal and InstallationINFOID:0000000006222675
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because sensor rotor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to RAX-7, "Removal and Installation".
INSTALLATION
Install wheel hub and bearing assembly. Refer to RAX-7, "Removal and Installation".
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-137
< REMOVAL AND INSTALLATION > [WITH VDC]
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ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Removal and InstallationINFOID:0000000006222676
REMOVAL
1. Remove hydraulic booster assembly. Refer to BR-29, "Removal and Installation".
CAUTION:
After replacing the hydraulic booster assembly or motor/accumulator assembly, always follow the
accumulator disposal procedure to discard the hydraulic booster assembly or motor/accumulator
assembly. Refer to BR-33, "
Disposal".
2. Remove ABS actuator and electric unit (control unit). Refer to BR-30, "
Disassembly and Assembly".
INSTALLATION
Note the following, and install in the reverse order of removal.
 When installing brake tube, tighten to the specified torque using a crowfoot and torque wrench so that flare
nut and brake tube are not damaged. Refer to BR-22, "
FRONT : Exploded View".
 Never remove and install hydraulic booster assembly by holding harness.
 Bleed air from brake piping after installation. Refer to BR-11, "
Bleeding Brake System".
 Never apply excessive impact to hydraulic booster assembly, such as by dropping it.
 Check that connector is fully locked after hydraul ic booster assembly harness connector is installed.
 Perform decel G sensor calibration when hydraulic boos ter assembly [ABS actuator and electric unit (control
unit)] is replaced. Refer to BRC-66, "
Work Procedure".
Revision: 2010 May2011 QX56

BRC-138
< REMOVAL AND INSTALLATION >[WITH VDC]
YAW RATE/SIDE/DECEL G SENSOR
YAW RATE/SIDE/DECEL G SENSOR
Exploded ViewINFOID:0000000006222677
Removal and InstallationINFOID:0000000006222678
REMOVAL
CAUTION:
Never drop or strike yaw rate/side/decel G sensor,
because it has little endurance to impact. Never use
a pneumatic tool.
1. Remove console finisher assembly. Refer to IP-25, "
Removal and Installation".
2. Disconnect yaw rate/side/decel G sensor harness connector.
3. Remove yaw rate/side/decel G sensor.
INSTALLATION
Note the following, and install in the reverse order of removal.
 Never drop or strike yaw rate/transverse/decel G sensor, because it has little endurance to impact. Never
use a power tool.
 Perform decel G sensor calibration when yaw rate/si de/decel G sensor is removing/installing or replaced.
Refer to BRC-66, "
Work Procedure".
1. Yaw rate/side/decel G sensor 2. Yaw rate/side/decel G sensor har-
ness connector
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JPFIC0201GB
Revision: 2010 May2011 QX56

STEERING ANGLE SENSORBRC-139
< REMOVAL AND INSTALLATION > [WITH VDC]
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STEERING ANGLE SENSOR
Removal and InstallationINFOID:0000000006222679
REMOVAL
1. Remove spiral cable assembly. Refer to SR-14, "Removal and Installation".
2. Remove steering angle sensor.
INSTALLATION
Note the following, and install in the reverse order of removal.
 Perform steering angle sensor neutral position adjustm ent when steering angle sensor is removing/installing
or replaced. Refer to BRC-64, "
Work Procedure".
Revision: 2010 May2011 QX56

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 switch assembly (2WD models) or
4WD switch assembly (4WD models).
REMOVAL
1. Remove console finisher assembly from center console assembly. Refer to IP-25, "Removal and Installa-
tion".
2. Disconnect SNOW MODE / TOW MODE / VDC OFF s witch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
3. Press SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD switch assembly
(4WD models) fixing pawls, and remove SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD
models) or 4WD switch assembly (4WD models) from console finisher assembly.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

PRECAUTIONSBRC-141
< PRECAUTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
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PRECAUTION
PRECAUTIONS
Precautions for Preview Function ServiceINFOID:0000000006228290
CAUTION:
 Never look straight into th e laser beam discharger when adjusting laser beam aiming.
 Never use the ICC sensor removed from vehicle. Never disassemble or remodel.
 Erase DTC when replacing parts of ICC system. The n check the operation of ICC system after adjust-
ing laser beam aiming if necessary.
Revision: 2010 May2011 QX56

BRC-142
< SYSTEM DESCRIPTION >[BRAKE ASSIST (WITH PREVIEW FUNCTION)]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006248456
1. ICC steering switch 2. Information display, ICC system
warning lamp, IBA OFF indicator
lamp, buzzer
(On the combination meter)3. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion"
4. Transfer control unit
Refer to DLN-10, "
Component Parts
Location"
5. ICC brake hold relay 6. ECM
Refer to EC-16, "
Component Parts
Location"
7. ICC sensor 8. TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Component Parts Loca-
tion"
9. ABS actuator and el ectric unit (con-
trol unit)
Refer to BRC-10, "
Component Parts
Location"
10. Stop lamp switch 11. ICC brake switch 12. IBA OFF switch
JSOIA0362ZZ
Revision: 2010 May2011 QX56

COMPONENT PARTSBRC-143
< SYSTEM DESCRIPTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
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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