2011 INFINITI QX56 steering

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

NORMAL OPERATING CONDITIONBRC-157
< SYMPTOM DIAGNOSIS > [INTELLIGENT BRAKE ASSIST]
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006228304
PRECAUTIONS FOR INTELLIGENT BRAKE ASSIST
 The IBA system is a not collision avoidance system. It is the driver′s responsibility to stay alert, drive safely
and be in control of the vehicle at all times.
 As there is a performance limit, it may not prov ide a warning or brake in certain conditions.
 The system will not detect the following objects:
- Pedestrians, animals, or obstacles in the roadway
- Oncoming vehicles in the same lane
 The system will not detect under the following conditions:
- When the sensor gets dirty and it is impossibl e to detect the distance from the vehicle ahead.
- When driving into a strong light (i.e. sunlight)
 The sensor generally detects the signals returned from the reflectors on a vehicle ahead. Therefore, the sys-
tem may not function properly under the following conditions:
- When the reflectors of the vehicle ahead are positioned high or close each other (including a small vehicle
such as motorcycles).
- When the sensor gets dirty or and it is impossi ble to detect the distance from the vehicle ahead.
- When the reflectors on the vehicle ahead is missing, damaged or covered.
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray.
- When visibility is low (such as rain, fog, snow, etc.).
- When snow or road spray from traveling vehicles are raised up.
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor visibility.
- When excessively heavy baggage is loaded in the rear seat or the luggage room of vehicle.
- When abruptly accelerating or decelerating.
- On steep downhill or roads with sharp curves.
- When there is a highly reflective object near the vehicle ahead (i.e. very close to other vehicle, signboard,
etc.).
- While towing a trailer or other vehicle.
 Depending on certain road conditions (curved, beginning of a curve), vehicle conditions (steering position,
vehicle position), or preceding vehicle ′s conditions (position in lane, etc. ), the system may not function prop-
erly.
 The system may not function in offset conditions.
 The system may not function when the distanc e to the vehicle ahead is extremely close.
 The system detect highly reflective objects such as reflectors, signs, white markers, and other stationary objects on the road or
near the traveling lane, and when in extreme conditions, detection
of these objects may caus e the system to function.
 The system is designed to automatically check the sensor ′s func-
tionality. If the sensor is covered with ice, a transparent or translu-
cent plastic bag, etc., the system may not detect them. In these
instances the system may not be able to warn properly. Be sure to
check and clean the sensor regularly.
 Excessive noise will interfere with the warning chime sound, and the chime may not be heard.
 Never step in under the brake pedal to avoid an accident when IBA
system turns ON.
 Sudden appearance of the vehicle in front (i.e. it abrupt ly cuts in) may not be detected and the system may
not warn soon enough.
 The system will be cancelled automatically with a beep sound and the IBA OFF indicator lamp will illuminate
under the following conditions:
- When the sensor window is dirty
- When the system malfunctions
JSFIA0385ZZ
Revision: 2010 May2011 QX56

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ICC SENSOR : Diagnosis Procedure .................
..
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C1A24 NP RANGE ...........................................113
DTC Logic ........................................................... ..113
Diagnosis Procedure .............................................113
C1A26 ECD MODE MALFUNCTION ...............115
DTC Logic ........................................................... ..115
Diagnosis Procedure .............................................115
C1A27 ECD POWER SUPPLY CIRCUIT .........116
DTC Logic ........................................................... ..116
Diagnosis Procedure .............................................116
C1A2A ICC SENSOR POWER SUPPLY CIR-
CUIT ..................................................................
117
DTC Logic ........................................................... ..117
Diagnosis Procedure .............................................117
C1A33 CAN TRANSMISSION ERROR ...........118
DTC Logic ........................................................... ..118
Diagnosis Procedure .............................................118
C1A34 COMMAND ERROR .............................119
DTC Logic ........................................................... ..119
Diagnosis Procedure .............................................119
C1A35 ACCELERATOR PEDAL ACTUATOR ..120
DTC Logic ........................................................... ..120
Diagnosis Procedure .............................................120
C1A36 ACCELERATOR PEDAL ACTUATOR
CAN COMM ......................................................
121
DTC Logic ........................................................... ..121
Diagnosis Procedure .............................................121
C1A37 ACCELERATOR PEDAL ACTUATOR
CAN 2 ...............................................................
122
DTC Logic ........................................................... ..122
Diagnosis Procedure .............................................122
C1A38 ACCELERATOR PEDAL ACTUATOR
CAN 1 ...............................................................
123
DTC Logic ........................................................... ..123
Diagnosis Procedure .............................................123
C1A39 STEERING ANGLE SENSOR ..............124
ADAS CONTROL UNIT ......................................... ..124
ADAS CONTROL UNIT : DTC Logic ....................124
ADAS CONTROL UNIT : Diagnosis Procedure ....124
ICC SENSOR ......................................................... ..124
ICC SENSOR : DTC Logic ....................................124
ICC SENSOR : Diagnosis Procedure ...................125
C1A40 SYSTEM SWITCH CIRCUIT ................126
DTC Logic ........................................................... ..126
Diagnosis Procedure .............................................126
Component Inspection (IBA OFF Switch) .............127
C1A50 ADAS CONTROL UNIT .......................128
DTC Logic ............................................................ ..128
Diagnosis Procedure .............................................128
C1F01 ACCELERATOR PEDAL ACTUATOR .129
DTC Logic ............................................................ ..129
Diagnosis Procedure .............................................129
C1F02 ACCELERATOR PEDAL ACTUATOR .130
DTC Logic ............................................................ ..130
Diagnosis Procedure .............................................130
C1F05 ACCELERATOR PEDAL ACTUATOR
POWER SUPPLY CIRCUIT ............................
131
DTC Logic ..............................................................131
Diagnosis Procedure .............................................131
U0104 ADAS CAN 1 .......................................132
DTC Logic ............................................................ ..132
Diagnosis Procedure .............................................132
U0121 VDC CAN 2 ..........................................133
ADAS CONTROL UNIT ......................................... ..133
ADAS CONTROL UNIT : DTC Logic .....................133
ADAS CONTROL UNIT : Diagnosis Procedure ....133
ICC SENSOR ......................................................... ..133
ICC SENSOR : DTC Logic ....................................133
ICC SENSOR : Diagnosis Procedure ....................134
U0126 STRG SEN CAN 1 ...............................135
ADAS CONTROL UNIT ......................................... ..135
ADAS CONTROL UNIT : DTC Logic .....................135
ADAS CONTROL UNIT : Diagnosis Procedure ....135
ICC SENSOR ......................................................... ..135
ICC SENSOR : DTC Logic ....................................135
ICC SENSOR : Diagnosis Procedure ....................136
U0235 ICC SENSOR CAN 1 ...........................137
DTC Logic ............................................................ ..137
Diagnosis Procedure .............................................137
U0401 ECM CAN 1 .........................................138
DTC Logic ..............................................................138
Diagnosis Procedure .............................................138
U0402 TCM CAN 1 ..........................................139
DTC Logic ............................................................ ..139
Diagnosis Procedure .............................................139
U0405 ADAS CAN 2 .......................................140
DTC Logic ............................................................ ..140
Diagnosis Procedure .............................................140
U0415 VDC CAN 1 ..........................................141
ADAS CONTROL UNIT ......................................... ..141
ADAS CONTROL UNIT : DTC Logic .....................141
ADAS CONTROL UNIT : Diagnosis Procedure ....141
ICC SENSOR ......................................................... ..141
Revision: 2010 May2011 QX56

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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 .................................................... ..
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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

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THE SYSTEM DOES NOT DETECT THE VE-
HICLE AHEAD AT ALL .................................. ..
171
Description .......................................................... ..171
Diagnosis Procedure .............................................171
NORMAL OPERATING CONDITION ...............173
Description .......................................................... ..173
REMOVAL AND INSTALLATION .............176
ICC SENSOR .................................................. ..176
Exploded View .................................................... ..176
Removal and Installation ..................................... ..176
ICC STEERING SWITCH ................................177
Exploded View .......................................................177
ASCD
SYSTEM DESCRIPTION .... .......................
178
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ............................................................
178
Information ........................................................... ..178
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-9
< SYSTEM DESCRIPTION > [ICC]
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006224265
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 : Compon ent 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 : Compon ent Parts Loca-
tion"
9. ABS actuator and electric 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

CCS-10
< SYSTEM DESCRIPTION >[ICC]
COMPONENT PARTS
Component Description
INFOID:0000000006224266
× : 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 inst rument 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 pres sure control 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 (control 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 (control 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

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