4WD INFINITI QX56 2011 Factory Owner's Guide

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

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

SYSTEM
BRC-145
< SYSTEM DESCRIPTION > [BRAKE ASSIST (WITH PREVIEW FUNCTION)]
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SYSTEM
BRAKE ASSIST (WITH PREVIEW FUNCTION)
BRAKE ASSIST (WITH PREVIEW F UNCTION) : System DescriptionINFOID:0000000006228293
FUNCTION DESCRIPTION
When the Preview Function identifies the need to apply emergency braking by sensing a vehicle ahead in the
same lane and the distance and relative speed from it, it applies the brake pre-pressure before the driver
depress the brake pedal and helps improve brake response by reducing pedal free play.
The Preview Function shares component parts and diagnosis with the Intelligent Cruise Control (ICC) system.
CAUTION:
This system is only an aid to assist braking oper ation and is not a collision warning or avoidance
device. It is the driver ′s responsibility to stay aler t, drive safely and be in control of the vehicle at all
times.
OPERATION DESCRIPTION
 The system detects the distance to the vehicle in fr ont with the ICC sensor of ICC and judges the necessity
of emergency braking.
 The system detects the accelerator pedal release operati on of the driver by the accelerator pedal position
sensor and estimates the driver's brake operation intention.
 If the system is judged that the emergency braking is nec essary and that the driver has the intention to oper-
ate the brake, the ABS actuator and electric unit (control unit) applies pre-pressure to reduce brake pedal
play.
NOTE:
This system will not operate under the following conditions:
 When the vehicle is moving at approx imately 32 km/h (20 MPH) or less.
 When the 4WD shift switch is in the 4H or 4L position.
END OF OPERATION
The pre-pressure function ceases when the following conditions are met:
1. When the driver depresses the acce lerator pedal or the brake pedal.
2. If the driver does not operate the accelerator pedal or brake pedal within approximately 1 second.
Revision: 2010 May2011 QX56

COMPONENT PARTSBRC-151
< SYSTEM DESCRIPTION > [INTELLIGENT BRAKE ASSIST]
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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 in put 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
Stop lamp switch
××××
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

SYSTEM
BRC-153
< SYSTEM DESCRIPTION > [INTELLIGENT BRAKE ASSIST]
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Fail-safe Indication
NOTE:
When the IBA turns OFF, the IBA OFF indicator lamp will illuminate.
Condition Description Indication on the combination meter
When the 4WD shift switch is in the 4H or
4L position The system is temporary unavailable.
(Without the warning chime)
JSFIA0444ZZ
Condition Description Indication on the combination meter
 When the sensor window is dirty
 When the system malfunction The system will be cancelled automatically
with a beep sound.
When driving into a strong light
(i.e. sunlight) The system is temporary unavailable.
(Without the warning chime)
JSFIA0392ZZ
Revision: 2010 May2011 QX56

CCS-4
ICC SENSOR : DTC Logic ....................................141
ICC SENSOR : Diagnosis Procedure ....................142
U0428 STRG SEN CAN 2 ................................143
ADAS CONTROL UNIT ......................................... ..143
ADAS CONTROL UNIT : DTC Logic .....................143
ADAS CONTROL UNIT : Diagnosis Procedure .....143
ICC SENSOR ......................................................... ..143
ICC SENSOR : DTC Logic ....................................143
ICC SENSOR : Diagnosis Procedure ....................144
U1000 CAN COMM CIRCUIT ..........................145
ADAS CONTROL UNIT ......................................... ..145
ADAS CONTROL UNIT : Description ....................145
ADAS CONTROL UNIT : DTC Logic .....................145
ADAS CONTROL UNIT : Diagnosis Procedure .....145
ICC SENSOR ......................................................... ..145
ICC SENSOR : Description ...................................145
ICC SENSOR : DTC Logic ....................................145
ICC SENSOR : Diagnosis Procedure ....................146
U1010 CONTROL UNIT (CAN) .......................147
ADAS CONTROL UNIT ......................................... ..147
ADAS CONTROL UNIT : Description ....................147
ADAS CONTROL UNIT : DTC Logic .....................147
ADAS CONTROL UNIT : Diagnosis Procedure .....147
ICC SENSOR ......................................................... ..147
ICC SENSOR : Description ...................................147
ICC SENSOR : DTC Logic ....................................147
ICC SENSOR : Diagnosis Procedure ....................147
U150B ECM CAN 3 .........................................148
DTC Logic ............................................................ ..148
Diagnosis Procedure .............................................148
U150C VDC CAN 3 ..........................................149
DTC Logic ............................................................ ..149
Diagnosis Procedure .............................................149
U150D TCM CAN 3 ..........................................150
DTC Logic ............................................................ ..150
Diagnosis Procedure .............................................150
U150E BCM CAN 3 .........................................151
DTC Logic ............................................................ ..151
Diagnosis Procedure .............................................151
U1502 ICC SENSOR CAN COMM CIRC ........152
DTC Logic ............................................................ ..152
Diagnosis Procedure .............................................152
U1513 METER CAN 3 .....................................153
DTC Logic ............................................................ ..153
Diagnosis Procedure .............................................153
U1514 STRG SEN CAN 3 ................................154
DTC Logic ............................................................ ..154
Diagnosis Procedure ............................................ .154
U1515 ICC SENSOR CAN 3 ............................155
DTC Logic ............................................................ .155
Diagnosis Procedure .............................................155
U1517 ACCELERATOR PEDAL ACTUATOR
CAN 3 ...............................................................
156
DTC Logic ............................................................ .156
Diagnosis Procedure .............................................156
U1520 4WD CAN 3 ...........................................157
DTC Logic ............................................................ .157
Diagnosis Procedure .............................................157
POWER SUPPLY AND GROUND CIRCUIT ....158
ADAS CONTROL UNIT .......................................... .158
ADAS CONTROL UNIT : Diagnosis Procedure ....158
ICC SENSOR .......................................................... .158
ICC SENSOR : Diagnosis Procedure ...................158
SYMPTOM DIAGNOSIS ...........................160
INTELLIGENT CRUISE CONTROL SYSTEM
SYMPTOMS .................................................... ..
160
Symptom Table .................................................... .160
MAIN SWITCH DOES NOT TURN ON, MAIN
SWITCH DOES NOT TURN OFF .....................
161
Description ........................................................... .161
Diagnosis Procedure .............................................161
ICC SYSTEM CANNOT BE SET (MAIN
SWITCH TURNS ON/OFF) ...............................
162
Description ........................................................... .162
Diagnosis Procedure .............................................162
ICC STEERING SWITCH (OTHER THAN
MAIN SWITCH) DOES NOT FUNCTION .........
164
Description ........................................................... .164
Diagnosis Procedure .............................................164
ICC SYSTEM DOES NOT CANCEL WHEN A/
T SELECTOR LEVER SETS ON "N" ...............
165
Description ........................................................... .165
Diagnosis Procedure .............................................165
CHIME DOES NOT SOUND .............................166
Description ........................................................... .166
Diagnosis Procedure .............................................166
DRIVING FORCE IS HUNTING ........................168
Description ........................................................... .168
Diagnosis Procedure .............................................168
FREQUENTLY CANNOT DETECT THE VEHI-
CLE AHEAD / DETECTION ZONE IS SHORT ..
169
Description ........................................................... .169
Diagnosis Procedure .............................................169
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-11
< SYSTEM DESCRIPTION > [ICC]
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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 in put 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
Stop lamp switch
××××
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

CCS
SYSTEMCCS-13
< SYSTEM DESCRIPTION > [ICC]
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Transmit unit Signal name Description
ECM CAN com-
munica-
tionClosed throttle position signal Receives idle position state (ON/OFF)
Accelerator pedal position signal Receives accelerator pedal position (angle)
ICC prohibition signal
Receives an operable/inoperable state of the ICC sys-
tem
ICC steering switch
signal Main switch signal
Receives the operational state of the ICC steering
switch
SET/COAST switch
signal
CANCEL switch sig-
nal
RESUME/ACCEL-
ERATE switch signal
DISTANCE switch
signal
Engine speed signal Receives engine speed
Stop lamp switch signal Receives an operational state of the brake pedal
ICC brake switch signal Receives an operational state of the brake pedal
Snow mode signal Receives an operational state of the snow mode
TCM CAN com-
munica-
tionInput speed signal Receives the number of revolutions of input shaft
Current gear position signal Receives a current gear position
Shift position signal Receives a selector lever position
Output shaft revolution signal Receives the number of revolutions of output shaft
ABS actuator
and electric unit
(control unit) CAN com-
munica-
tionABS malfunction signal Receives
a malfunction state of ABS
ABS operation signal Receives an operational state of ABS
ABS warning lamp signal Receives an ON/OFF state of ABS warning lamp
TCS malfunction signal Receives a malfunction state of TCS
TCS operation signal Receives an operational state of TCS
VDC OFF switch signal Receives an ON/OFF state of VDC
VDC malfunction signal Receives a malfunction state of VDC
VDC operation signal Receives an operational state of VDC
Vehicle speed signal (ABS) Receives wheel speeds of four wheels
Stop lamp switch signal Receives an operational state of the brake pedal
Yaw rate signal Receives yaw rate acting on the vehicle
Combination
meter CAN com-
munica-
tion
Parking brake switch signal Receives an operational state of the parking brake
BCM CAN com-
munica-
tion
Front wiper request signal Receives an operational state of front wiper(s)
Steering angle
sensor CAN com-
munica-
tionSteering angle sensor malfunction signal Receives a malfunction state of steering angle sensor
Steering angle sensor signal
Receives the number of revolutions, turning direction of
the steering wheel
Steering angle speed signal Receives the turning angle speed of the steering wheel
Transfer control
unit CAN com-
munica-
tion
Current 4WD mode signal Receives a mode selection state of the 4WD mode
Revision: 2010 May2011 QX56

CCS-18
< SYSTEM DESCRIPTION >[ICC]
SYSTEM
 When the SET/COAST switch is pushed under the following condi-
tions, the system cannot be set. A warning chime will sound and
the set speed indicator and own vehicle indicator will blink.
- When the SNOW mode switch is ON (To use the ICC system, turn
OFF the SNOW mode switch, push the MAIN switch to turn OFF
the ICC system and reset the ICC system by pushing the MAIN
switch again.)
- When the 4WD shift switch is not AUTO position. (To use the ICC
system, shift the AUTO position, push the MAIN switch to turn OFF
the ICC system and reset the ICC system by pushing the MAIN
switch again.)
- When the VDC is OFF. (To use the ICC system, turn ON the VDC system, push the MAIN switch to turn OFF the I CC system and reset the ICC system by pushing the MAIN
switch again.)
- When ABS or VDC (including the TCS) operates.
- When driving into a strong light (i.e., sunlight).
- When the wheel is slipping. (To use the ICC system, make sure the wheels are no longer spinning, push the
MAIN switch to turn OFF the ICC system and rese t the ICC system by pushing the MAIN switch again.)
Cancel Conditions
1. When CANCEL switch is pressed.
2. When brake pedal is depressed.
3. When the vehicle ahead is not detected below the speed of 24 km/h (15 MPH).
4. When the selector lever is not in the “D” position or manual mode.
5. When the parking brakes are applied.
6. When the system judges the vehicle is at standstill.
7. When the front wiper s are operating at HI.
(If the vehicle is equipped with a rain sensing auto-wi per, the system may cancel when the wipers are set
to AUTO.)
8. When the SNOW mode switch is turned ON.
9. When 4WD shift switch is not AUTO position
10. When ABS or VDC (including the TCS) operates.
11. When the MAIN switch is turned OFF.
12. When a wheel slips.
13. When driving into a strong light (i.e., sunlight).
14. When the VDC is turned OFF.
15. When the system malfunction occurs.
CONVENTIONAL (FIXED SPEED) CR UISE CONTROL MODE FUNCTION
CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE FUNCTION : System
JPOIA0223ZZ
Revision: 2010 May2011 QX56

CCS-24
< SYSTEM DESCRIPTION >[ICC]
OPERATION
WARNING LAMP AND AUTOMATIC CANCELLATION DISPLAY
NOTE:
Condition Display on ICC system display
When own vehicle comes closer to the vehicle ahead and it is judged that the distance be-
tween the vehicles is not sufficient
JSOIA0301ZZ
Condition Description Display on ICC system display
Warning
display  When the VDC is turned OFF
 When the VDC or ABS (in-
cluding the TCS) operates
 When a wheel slips
 When the 4WD shift switch is not AUTO
 When the SNOW mode switch is turned ON
 When driving into a strong light (i.e., sunlight) A chime sounds and the control is automatically
canceled.
NOTE:
When the conditions listed above are no longer
present, turn the system OFF using the MAIN
switch.
Turn the ICC system back on to use the system.
When the sensor window is
dirty, making it impossible to de-
tect a vehicle ahead. A chime sounds and the control is automatically
canceled.
NOTE:
Park the vehicle in a safe place, turn the engine
OFF.
Clean the sensor window with a soft cloth and
then perform the settings again.
When the ICC system is mal-
functioning A chime sounds and the control is automatically
canceled.
NOTE:
Turn the engine OFF and restart engine. If there
is no malfunction, it is possible to set the system.
Automatic
cancella-
tion display  When brake pedal is de-
pressed
 When CANCEL switch is pressed
 When a vehicle ahead is not
detected below the speed of
24 km/h (15 MPH)
 When the system judges the
vehicle is at standstill
 When the selector lever is not in “D” position or manual
mode
 When the front wipers are op- erating at HI
(If the vehicle is equipped
with a rain sensing auto-wip-
er, the system may cancel
when the wipers are set to
AUTO)
 When the parking brake are
applied A chime sounds and the control is automatically
canceled.
NOTE:
 The system will be in a standby, after the control
is automatically canceled.
 A chime sounds when the control is automati-
cally canceled, except when brake pedal is de-
pressed or when CANCEL switch is pressed.
JSOIA0302ZZ
JSOIA0303ZZ
JSOIA0304ZZ
JSOIA0292ZZ
Revision: 2010 May2011 QX56