2008 INFINITI QX56 diagram

BRC-92
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Wiring Diagram
INFOID:0000000001686371
ABFWA0155GB
Revision: March 2010 2008 QX56

CCS-1
CRUISE CONTROL
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CCS
SECTION CCS
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CONTENTS
CRUISE CONTROL SYSTEM
BASIC INSPECTION ....... .............................3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Work Flow ........................................................... ......3
INSPECTION AND ADJUSTMENT .....................5
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ......
5
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ..................................
5
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement .......
5
LASER BEAM AIMING ADJUSTMENT ................ ......5
LASER BEAM AIMING ADJUSTMENT : Outline
of Laser Beam Aiming Adjustment Procedure ..........
5
LASER BEAM AIMING ADJUSTMENT : Prepara-
tion ...................................................................... ......
5
LASER BEAM AIMING ADJUSTMENT : Setting
up the ICC Target Board ...........................................
6
LASER BEAM AIMING ADJUSTMENT : Sensor
Adjustment ................................................................
7
ACTION TEST ....................................................... ......8
ACTION TEST : ICC System Running Test ..............8
FUNCTION DIAGNOSIS ..............................12
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ........................................................... ....
12
System Description ............................................. ....12
INTELLIGENT CRUISE CONTROL SYSTEM ....13
System Diagram .................................................. ....13
System Description .................................................13
Component Parts Location ......................................15
Component Description ...........................................16
DIAGNOSIS SYSTEM (ICC SENSOR INTE-
GRATED UNIT) ..................................................
17
Diagnosis Description ......................................... ....17
CONSULT-III Function (ICC) ............................... ....18
COMPONENT DIAGNOSIS .........................22
DTC 11 CONTROL UNIT ..................................22
DTC 11 CONTROL UNIT .................................... ....22
DTC 12 VDC CONTROL UNIT ..........................23
DTC 12 VDC CONTROL UNIT ................................23
DTC 20 CAN COMM CIRCUIT ..........................24
DTC 20 CAN COMM CIRCUIT ................................24
DTC 31 POWER SUPPLY CIR1, DTC 34
POWER SUPPLY CIR2 .....................................
25
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER
SUPPLY CIR2 .........................................................
25
DTC 41 VHCL SPEED SE CIRC .......................26
DTC 41 VHCL SPEED SE CIRC .............................26
DTC 43 VDC/TCS/ABS CIRC ...........................27
DTC 43 VDC/TCS/ABS CIRC .................................27
DTC 45 BRAKE SW/STOP L SW .....................28
DTC 45 BRAKE SW/STOP L SW ............................28
DTC 46 OPERATION SW CIRC .......................30
DTC 46 OPERATION SW CIRC ......................... ....30
DTC 74 LASER BEAM OFF CNTR ..................31
DTC 74 LASER BEAM OFF CNTR .........................31
DTC 90 STOP LAMP RLY FIX ..........................32
DTC 90 STOP LAMP RLY FIX ................................32
DTC 92 ECM CIRCUIT ......................................37
DTC 92 ECM CIRCUIT ............................................37
DTC 96 NP RANGE ..........................................38
DTC 96 NP RANGE ............................................ ....38
DTC 97 AT CIRCUIT .........................................39
DTC 97 AT CIRCUIT ...............................................39
Revision: March 2010 2008 QX56

CCS-2
DTC 98 GEAR POSITION .................................40
DTC 98 GEAR POSITION ................................... ...40
DTC 102 LASER STAIN ....................................41
DTC 102 LASER STAIN ...................................... ...41
DTC 103 LASER SENSOR FAIL .......................42
DTC 103 LASER SENSOR FAIL ......................... ...42
DTC 104 LASER AIMING INCMP .....................43
DTC 104 LASER AIMING INCMP ....................... ...43
DTC 107 LASER COMM FAIL ..........................44
DTC 107 LASER COMM FAIL ............................ ...44
DTC109 LASER HIGH TEMP ............................45
DTC 109 LASER HIGH TEMP ............................ ...45
ECU DIAGNOSIS ..................................... ...46
ICC UNIT ............................................................46
Terminal and Reference Va lue for ICC Unit ...........46
Wiring Diagram .................................................... ...47
Fail Safe .................................................................54
Diagnostic Trouble Code (DTC) Chart ....................55
SYMPTOM DIAGNOSIS .............................57
INTELLIGENT CRUISE CONTROL SYSTEM
SYMPTOMS .................................................... ...
57
Symptom Chart .................................................... ...57
MAIN SWITCH DOES NOT TURN ON, MAIN
SWITCH DOES NOT TURN OFF ......................
58
Diagnosis Procedure ........................................... ...58
ICC SYSTEM CANNOT BE SET (MAIN
SWITCH TURNS ON/OFF) ................................
59
Diagnosis Procedure ........................................... ...59
ICC STEERING SWITCH (OTHER THAN
MAIN SWITCH) DOES NOT FUNCTION ..........
60
Diagnosis Procedure ........................................... ...60
ICC SYSTEM DOES NOT CANCEL WHEN A/
T SELECTOR LEVER SETS ON "N" ................
61
Diagnosis Procedure ............................................ ...61
CHIME DOES NOT SOUND ..............................62
Diagnosis Procedure ............................................ ...62
DRIVING FORCE IS HUNTING .........................63
Diagnosis Procedure ............................................ ...63
ICC SYSTEM FREQUENTLY CANNOT DE-
TECT THE VEHICLE AHEAD/ DETECTION
ZONE IS SHORT ...............................................
64
Diagnosis Procedure ...............................................64
THE SYSTEM DOES NOT DETECT THE VE-
HICLE AHEAD AT ALL .....................................
65
Diagnosis Procedure ............................................ ...65
NORMAL OPERATING CONDITION ................66
Description ........................................................... ...66
PRECAUTION ............................................68
PRECAUTIONS .............................................. ...68
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
68
ICC System Service ................................................68
PREPARATION ..........................................69
PREPARATION .............................................. ...69
Special Service Tool ............................................ ...69
ON-VEHICLE REPAIR ...............................70
ICC C/U ..............................................................70
ICC Unit ............................................................... ...70
ICC SENSOR INTEGRATED UNIT ...................71
ICC Sensor .......................................................... ...71
ICC STEERING SWITCH ..................................72
Removal and Installation .........................................72
Revision: March 2010 2008 QX56

CCS
INTELLIGENT CRUISE CONTROL SYSTEMCCS-13
< FUNCTION DIAGNOSIS >
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INTELLIGENT CRUISE CONTROL SYSTEM
System DiagramINFOID:0000000001731809
System DescriptionINFOID:0000000001731810
• The Intelligent Cruise Control (ICC) system automatic ally maintains a selected distance from the vehicle
ahead according to that vehicle's speed, or at the set speed, if the road ahead is clear.
• The ICC function has two cruise control modes and brake assist (with preview function).
• To activate or deactivate the ICC system and set the vehicle speed and vehicle-to-vehicle distance, use the
ICC steering switch.
• The operation status of the ICC system is indicated on the ICC system display of the combination meter.
VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
• Vehicle-to-vehicle distance control mode, the vehicle can maintain the same speed as other vehicles without
the constant need to adjust the set speed as the dr iver would with a normal cruise control system.
• The system is intended to enhance the operation of the v ehicle when following the vehicle traveling in the
same lane and direction.
• If the ICC sensor integrated unit detects a slow er moving vehicle ahead, the system will reduce speed so
that the vehicle ahead can be followed at the selected distance.
• The system automatically controls the throttle and applies the brakes (up to 25% of vehicle braking power) if necessary.
• The detection range of the sensor is approximately 390 ft (120 m) ahead.
• Refer to Owner's Manual for Intelligent Cr uise Control System operating instructions.
CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE
• Conventional (fixed speed) cruise control mode is cruising at preset speeds.
• Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
BRAKE ASSIST (WITH PREVIEW FUNCTION)
• When the force applied to brake pedal exceeds a certain level, the Brake Assist is activated and generates a
greater braking force than that of a convent ional brake booster even with light pedal force.
• When the Preview Function identifies the need to apply the sudden brake by sensing the vehicle ahead in the same lane and the distance and relative speed from it, it applies the brake pre-pressure before driver
depresses the brake pedal and improves brake response by reducing its free play.
• Refer to Owner's Manual for BRAKE ASSIST (WITH PREVIEW FUNCTION) operating instructions.
WKIA1976E
Revision: March 2010 2008 QX56

CCS-16
< FUNCTION DIAGNOSIS >
INTELLIGENT CRUISE CONTROL SYSTEM
Component Description
INFOID:0000000001731812
× : Applicable
4. ICC brake hold relay E134 5. ICC sensor E426. ICC brake switch E37
7. Stop lamp switch E38 8. ICC unit B13, B17
(view with luggage side finisher low-
er LH removed)
Component Veh ic le-t o-
vehicle
distance
control mode Conventional
(Fixed speed)
cruise
control mode Brake assist
(With preview function) Description
ICC unit ××× Controls vehicle speed through ECM via CAN commu-
nication.
ICC sensor ××× Measures distance to objects in front of the vehicle and
transmits that information to the ICC unit.
ECM ××× Refer to EC-21, "
System Diagram".
ABS actuator and electric
unit (control unit) ×××
Refer to BRC-18, "
System Description".
Brake pressure sensor ×× Detects brake fluid pressure.
Brake booster ×× Adjusts brake fluid pressure based on command from
ABS actuator and electric unit (control unit).
BCM × Transmits front wiper request signal to ICC sensor inte-
grated unit through CAN communication.
TCM ×× Refer to TM-20, "
TCM Function".
Revision: March 2010 2008 QX56

CCS
ICC UNITCCS-47
< ECU DIAGNOSIS >
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Wiring DiagramINFOID:0000000001731893
AAOWA0002GB
Revision: March 2010 2008 QX56

CHG
CHG-1
ELECTRICAL & POWER CONTROL
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SECTION CHG
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CONTENTS
CHARGING SYSTEM
PRECAUTION .......
........................................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
2
Precaution for Power Generation Variable Voltage
Control System ..........................................................
3
PREPARATION ............................................4
PREPARATION .............................................. .....4
Special Service Tool ........................................... ......4
Commercial Service Tool ..........................................4
BASIC INSPECTION ....................................5
DIAGNOSIS AND REPAIR WORKFLOW ..... .....5
Work Flow ........................................................... ......5
FUNCTION DIAGNOSIS ...............................8
CHARGING SYSTEM ..................................... .....8
System Diagram .................................................. ......8
System Description ...................................................8
Component Description ............................................8
POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM .................................
9
System Diagram .................................................. ......9
System Description ...................................................9
Component Description .............................................9
COMPONENT DIAGNOSIS .........................10
CHARGING SYSTEM PRELIMINARY IN-
SPECTION ....... .................................................
10
Inspection Procedure ........................................... ....10
POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM OPERATION IN-
SPECTION ........................................................
11
Inspection Procedure ........................................... ....11
B TERMINAL CIRCUIT .....................................13
Description ...............................................................13
Diagnosis Procedure ...............................................13
L TERMINAL CIRCUIT .....................................14
Description ...............................................................14
Diagnosis Procedure ...............................................14
S TERMINAL CIRCUIT .....................................15
Description ...............................................................15
Diagnosis Procedure ...............................................15
CHARGING SYSTEM .......................................16
Wiring Diagram ........................................................16
SYMPTOM DIAGNOSIS ..............................21
CHARGING SYSTEM .......................................21
Symptom Table ................................................... ....21
ON-VEHICLE REPAIR .................................22
GENERATOR ....................................................22
Removal and Installation ..................................... ....22
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... ...
23
GENERATOR ....................................................23
Generator ............................................................ ....23
Revision: March 2010 2008 QX56

CHG-8
< FUNCTION DIAGNOSIS >
CHARGING SYSTEM
FUNCTION DIAGNOSIS
CHARGING SYSTEM
System DiagramINFOID:0000000001696178
System DescriptionINFOID:0000000001696179
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Component DescriptionINFOID:0000000001696180
ALMIA0207GB
Component part Description
Generator Terminal “1”
Refer to CHG-13, "
Description".
Terminal “2” Refer to CHG-15, "
Description".
Terminal “3” Refer to CHG-14, "
Description".
Terminal “4” Used for the power generation voltage variable control system.
Refer to
CHG-9, "
System Description".
Combination meter (C harge warning lamp) The IC regulator warning function activates to illuminate the
charge warning lamp if any of the following symptoms occur while
generator is operating:
• Excessive voltage is produced.
• No voltage is produced.
IPDM E/R Used for the power generation voltage variable control system.
Refer to
CHG-9, "
System Description".
Revision: March 2010 2008 QX56