diagram INFINITI QX56 2008 Factory Workshop Manual

CHG
POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
CHG-9
< FUNCTION DIAGNOSIS >
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POWER GENERATION VOLTAG
E VARIABLE CONTROL SYSTEM
System DiagramINFOID:0000000001696181
System DescriptionINFOID:0000000001696182
Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.
NOTE:
When any malfunction is detected in the power generat ion variable voltage control system, power generation
is performed according to the characterist ic of the IC regulator in the generator.
Component DescriptionINFOID:0000000001696183
ALMIA0057GB
Component part Description
Battery current sensor The battery current sensor is installed on the battery cable at the
negative terminal. The battery current sensor detects the charg-
ing/discharging current of the battery and sends a voltage signal
to the ECM according to the current value detected.
ECM The battery current sensor detects the charging/discharging cur-
rent of the battery. The ECM judges the battery condition based on
this signal.
The ECM judges whether to request more output via the power
generation voltage variable control according to the battery condi-
tion.
When performing the power generation voltage variable control,
the ECM calculates the target power generation voltage according
to the battery condition and sends the calculated value as the pow-
er generation command value to the IPDM E/R.
IPDM E/R The IPDM E/R converts the received power generation command
value into a pulse width modulated (PWM) command signal and
sends it to the IC regulator.
Generator (IC regulator) The IC regulator controls the power generation voltage by the tar-
get power generation voltage based on the received PWM com-
mand signal.
When there is no PWM command signal, the generator performs
the normal power generation according to the characteristic of the
IC regulator.
Revision: March 2010
2008 QX56

CHG-16
< COMPONENT DIAGNOSIS >
CHARGING SYSTEM
CHARGING SYSTEM
Wiring DiagramINFOID:0000000001696192
AAMWA0085GB
Revision: March 20102008 QX56

DEF-1
DRIVER CONTROLS
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SECTION DEF
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CONTENTS
DEFOGGER
BASIC INSPECTION ....... .............................3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Repair Work Flow ................................................ ......3
FUNCTION DIAGNOSIS ...............................4
REAR WINDOW DEFOGGER SYSTEM ........ .....4
System Diagram .................................................. ......4
System Description ...................................................4
Component Parts Location ........................................5
Component Description .............................................5
DIAGNOSIS SYSTEM (BCM) .............................6
COMMON ITEM ..................................................... ......6
COMMON ITEM : CONSULT-III Function (BCM -
COMMON ITEM) .......................................................
6
REAR WINDOW DEFOGGER ............................... ......6
REAR WINDOW DEFOGGER : CONSULT-III
Function (BCM - REAR DEFOGGER) ......................
6
CAN COMMUNICATION .....................................7
System Description ............................................. ......7
COMPONENT DIAGNOSIS ..........................8
REAR WINDOW DEFOGGER SWITCH ........ .....8
Description .......................................................... ......8
Component Function Check ......................................8
Diagnosis Procedure .................................................8
REAR WINDOW DEFOGGER RELAY ...............9
Description .......................................................... ......9
Component Function Check ......................................9
Diagnosis Procedure .................................................9
REAR WINDOW DEFOGGER POWER SUP-
PLY AND GROUND CIRCUIT ............................
10
Description .......................................................... ....10
Component Function Check ....................................10
Diagnosis Procedure ...............................................10
Component Inspection ......................................... ....11
DOOR MIRROR DEFOGGER LH .....................12
Description ...............................................................12
Component Function Check ....................................12
Diagnosis Procedure ...............................................12
Component Inspection .............................................13
DOOR MIRROR DEFOGGER RH .....................14
Description ...............................................................14
Component Function Check ....................................14
Diagnosis Procedure ...............................................14
Component Inspection .............................................15
ECU DIAGNOSIS .........................................16
BCM (BODY CONTROL MODULE) .................16
Reference Value .................................................. ....16
Wiring Diagram ........................................................17
SYMPTOM DIAGNOSIS ..............................25
REAR WINDOW DEFOGGER AND DOOR
MIRROR DEFOGGER DO NOT OPERATE. ....
25
Diagnosis Procedure ........................................... ....25
REAR WINDOW DEFOGGER DOES NOT
OPERATE BUT BOTH OF DOOR MIRROR
DEFOGGER OPERATE. ...................................
26
Diagnosis Procedure ...............................................26
BOTH DOORS MIRROR DEFOGGER DON’T
OPERATE BUT REAR WINDOW DEFOG-
GER OPERATES ..............................................
27
Diagnosis Procedure ...............................................27
DRIVER SIDE DOOR MIRROR DEFOGGER
DOES NOT OPERATE. .....................................
28
Diagnosis Procedure ...............................................28
PASSENGER SIDE DOOR MIRROR DEFOG-
GER DOES NOT OPERATE. ............................
29
Revision: March 2010 2008 QX56

DEF-4
< FUNCTION DIAGNOSIS >
REAR WINDOW DEFOGGER SYSTEM
FUNCTION DIAGNOSIS
REAR WINDOW DEFOGGER SYSTEM
System DiagramINFOID:0000000001735602
System DescriptionINFOID:0000000001735603
Operation Description
• Turn rear window defogger switch ON when the ignition switch is turned ON. Then A/C and AV switch
assembly (rear window defogger switch) transmits rear window defogger switch signal to BCM.
• BCM transmits rear window defogger control signal to IPDM E/R and display unit via CAN communication when rear window defogger operates.
• IPDM E/R turns rear window defogger relay and heated mirror relay ON when rear window defogger switch
signal is received.
• Rear window defogger and door mirror defogger are supplied with power and operate when rear window defogger relay and heated mirror relay turn ON.
• Rear window defogger ON is displayed when signal is received.
Timer function
• BCM turns rear window defogger relay and heated mirror relay ON for approximately 15 minutes when rear window defogger switch is turned ON while ignition switch is ON. It makes rear window defogger and door
mirror defogger operate.
• Timer is canceled after pressing rear window defogger switch again during timer operation. Then BCM turns
rear window defogger relay and heated mirror relay OFF. The same reaction also occurs during timer opera-
tion, if the ignition switch is turned OFF.
INPUT/OUTPUT SIGNAL CHART
ALLIA0892GB
Switch Input signal to BCM BCM functionAcutuator
Rear window defogger switch Defogger switch signal Rear window defogger & door mirror
defogger control Rear window defogger
Door mirror defogger
Ignition switch Ignition signal
Revision: March 2010 2008 QX56

BCM (BODY CONTROL MODULE)DEF-17
< ECU DIAGNOSIS >
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Wiring DiagramINFOID:0000000001735636
ALLWA0058GB
Revision: March 2010 2008 QX56

DLK-1
BODY EXTERIOR, DOORS, ROOF & VEHICLE SECURITY
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SECTION DLK
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CONTENTS
DOOR & LOCK
WITH INTELLIGENT KEY SYSTEM
BASIC INSPECTION ....... .............................
6
DIAGNOSIS AND REPAIR WORKFLOW ..... .....6
Work Flow ........................................................... ......6
INSPECTION AND ADJUSTMENT .....................9
ADDITIONAL SERVICE WHEN REMOVING BAT-
TERY NEGATIVE TERMINAL ............................... ......
9
ADDITIONAL SERVICE WHEN REMOVING
BATTERY NEGATIVE TERMINAL : Description ......
9
ADDITIONAL SERVICE WHEN REMOVING
BATTERY NEGATIVE TERMINAL : Special Re-
pair Requirement ................................................. ......
9
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ......
9
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ..................................
9
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement .......
9
FUNCTION DIAGNOSIS ..............................10
DOOR LOCK FUNCTION .............................. ....10
DOOR LOCK AND UNLOCK SWITCH ................. ....10
DOOR LOCK AND UNLOCK SWITCH : System
Diagram ...................................................................
10
DOOR LOCK AND UNLOCK SWITCH : System
Description ..............................................................
10
DOOR LOCK AND UNLOCK SWITCH :
Component Parts Location ....................................
11
DOOR LOCK AND UNLOCK SWITCH :
Component Description ..........................................
11
DOOR REQUEST SWITCH ................................... ....12
DOOR REQUEST SWITCH : System Diagram ......12
DOOR REQUEST SWITCH : System Description ....12
DOOR REQUEST SWITCH :
Component Parts Location ....................................
15
DOOR REQUEST SWITCH :
Component Description ...................................... ....
17
INTELLIGENT KEY ................................................ ....17
INTELLIGENT KEY : System Diagram ....................17
INTELLIGENT KEY : System Description ...............17
INTELLIGENT KEY : Component Parts Location ....20
INTELLIGENT KEY : Component Description ........21
BACK DOOR OPENER FUNCTION .................23
BACK DOOR OPENER SWITCH .......................... ....23
BACK DOOR OPENER SWITCH : System Dia-
gram ........................................................................
23
BACK DOOR OPENER SWITCH : System De-
scription ...................................................................
23
BACK DOOR OPENER SWITCH :
Component Parts Location ....................................
28
BACK DOOR OPENER SWITCH :
Component Description ..........................................
28
INTELLIGENT KEY ................................................ ....29
INTELLIGENT KEY : System Diagram ....................29
INTELLIGENT KEY : System Description ...............29
INTELLIGENT KEY : Component Parts Location ....31
INTELLIGENT KEY : Component Description ........32
WARNING FUNCTION ......................................34
System Description ..................................................34
Component Parts Location ....................................38
KEY REMINDER FUNCTION ............................40
System Description ..................................................40
Component Parts Location ....................................41
HAZARD AND BUZZER REMINDER FUNC-
TION ..................................................................
43
System Diagram ......................................................43
System Description ..................................................43
Component Parts Location ....................................44
Component Description ..........................................46
HOMELINK UNIVERSAL TRANSCEIVER .......47
Revision: March 2010 2008 QX56

DLK-4
BACK DOOR CLOSE SWITCH SYSTEM .......133
Diagnosis Procedure ........................................... ..133
BACK DOOR SWITCH ....................................134
Diagnosis Procedure ........................................... ..134
CINCH LATCH MOTOR SYSTEM ...................135
Diagnosis Procedure ........................................... ..135
INTELLIGENT KEY UNIT POWER BACK
DOOR INPUT SIGNAL ....................................
136
Description ........................................................... ..136
Diagnosis Procedure .............................................136
INTELLIGENT KEY UNIT POWER BACK
DOOR OUTPUT SIGNAL ................................
137
Description ........................................................... ..137
Diagnosis Procedure .............................................137
HOMELINK UNIVERSAL TRANSCEIVER ......138
Wiring Diagram .................................................... ..138
Description .............................................................139
Component Function Check ................................140
Diagnosis Procedure .............................................140
ECU DIAGNOSIS ..................................... ..142
BCM (BODY CONTROL MODULE) ............... .142
Reference Value .................................................. ..142
Terminal Layout .....................................................144
Physical Values .....................................................144
Wiring Diagram — POWER DOOR LOCK SYS-
TEM — ..................................................................
150
Fail Safe ................................................................162
DTC Inspection Priority Chart .............................163
DTC Index ........................................................... ..163
INTELLIGENT KEY UNIT ................................165
Reference Value - Intelligent Key Unit ................. ..165
Reference Value - Steering Lock Solenoid ............168
Wiring Diagram — INTELLIGENT KEY SYSTEM
— ......................................................................... ..
169
Fail Safe ................................................................186
BACK DOOR CONTROL UNIT .......................187
Reference Value .................................................. ..187
Wiring Diagram—AUTOMATIC BACK DOOR
SYSTEM— ............................................................
189
Fail Safe .............................................................. ..199
SYMPTOM DIAGNOSIS ............................200
INTELLIGENT KEY SYSTEM SYMPTOMS ... .200
Symptom Table ................................................... ..200
DOOR LOCK FUNCTION SYMPTOMS ..........201
DOOR LOCK AND UNLOCK SWITCH ................. ..201
DOOR LOCK AND UNLOCK SWITCH : Symptom
Table ......................................................................
201
INTELLIGENT KEY ................................................ ..202
INTELLIGENT KEY : Symptom Table ..................202
BACK DOOR OPENER FUNCTION ................204
BACK DOOR OPENER SWITCH .......................... .204
BACK DOOR OPENER SWITCH : Symptom Ta-
ble ........................................................................ .
204
BACK DOOR SWITCH ........................................... .204
BACK DOOR SWITCH : Symptom Table .............205
INTELLIGENT KEY ................................................ .205
INTELLIGENT KEY : Symptom Table ..................205
WARNING FUNCTION SYMPTOMS ...............206
Symptom Table .................................................... .206
KEY REMINDER FUNCTION SYMPTOMS .....209
Symptom Table .................................................... .209
HAZARD FUNCTION ..................................... ..210
Symptom Table .................................................... .210
HORN FUNCTION ............................................211
Symptom Table .................................................... .211
HOMELINK UNIVERSAL TRANSCEIVER ......212
Symptom Table .................................................... .212
SQUEAK AND RATTLE TROUBLE DIAG-
NOSES ..............................................................
213
Work Flow ............................................................ .213
Inspection Procedure ............................................215
Diagnostic Worksheet ...........................................217
PRECAUTION ...........................................219
PRECAUTIONS .............................................. ..219
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
219
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ................................
219
Precaution for work ...............................................220
PREPARATION .........................................221
PREPARATION .............................................. ..221
Special Service Tool ............................................ .221
Commercial Service Tool ......................................222
ON-VEHICLE REPAIR ..............................223
HOOD ............................................................. ..223
Fitting Adjustment ................................................ .223
Removal and Installation of Hood Assembly ........224
Removal and Installation of Hood Lock Control ....225
Hood Lock Control Inspection ...............................226
DOOR ............................................................. ..228
Fitting Adjustment ................................................ .228
Removal and Installation .......................................229
Revision: March 2010 2008 QX56

DLK-10
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK FUNCTION
FUNCTION DIAGNOSIS
DOOR LOCK FUNCTION
DOOR LOCK AND UNLOCK SWITCH
DOOR LOCK AND UNLOCK SWITCH : System DiagramINFOID:0000000001538906
DOOR LOCK AND UNLOCK SW
ITCH : System DescriptionINFOID:0000000001538907
DOOR LOCK FUNCTION
Functions Available by Operating the Door Lock an d Unlock Switches on Driver Door and Passenger Door
• Interlocked with the locking operation of door lock and unlock switch, door lock actuators of all door lock
actuators are locked.
• Interlocked with the unlocking operation of door lock and unlock switch, door lock actuators of all door lock
actuators are unlocked.
Functions Available by Operating the Key Cylinder Switch on Driver Door
• Interlocked with the locking operation of door key cyli nder, door lock actuators of all door lock actuators are
locked.
Selective Unlock Operation
• When door key cylinder is unlocked, door lo ck actuator driver side is unlocked.
• When door key cylinder is unlocked for the second time within 5 seconds after the first operation, door lock actuators on all doors are unlocked.
Select unlock operation mode can be changed using DOOR LOCK-UNLOCK SET mode in “WORK SUP-
PORT”. Refer to DLK-48, "
DOOR LOCK : CONSULT-III Function (BCM - DOOR LOCK)".
Key Reminder System
Refer to DLK-40, "System Description".
ALKIA0703GB
Switch Input/output signal to BCM BCM functionActuator
Main power window and door
lock/unlock switch Door lock/unlock signal Door lock/unlock control Door lock actuator
Power window and door lock/
unlock switch
Door key cylinder switch
Revision: March 2010 2008 QX56

DLK-12
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK FUNCTION
DOOR REQUEST SWITCH
DOOR REQUEST SWITCH : System DiagramINFOID:0000000001538910
DOOR REQUEST SWITCH : System DescriptionINFOID:0000000001538911
Only when pressing the request switch, it is possible
to lock and unlock the door by carrying the Intelligent
Key.
• The Intelligent Key system is a system that makes it possible to lock and unlock the door locks (door lock/
unlock function) by carrying the Intelligent Key, which operates based on the results of electronic ID verifica-
tion using two-way communications between the Intelligent Key and the vehicle (BCM).
CAUTION:
The driver should always carry the Intelligent Key
• If an action that does not meet the operating conditions of the Intelligent Key system is taken, the buzzer
goes off to inform the driver (Warning chime function).
• When a door lock is locked or unlocked with request switch or remote controller button operation, the hazard
lamps flash and the Intelligent Key warning buzzer or horn sounds (Hazard and buzzer/horn reminder func-
tion).
• The settings for each function can be changed with the CONSULT-III.
• If an Intelligent Key is lost, a new Intelligent Key can be registered. A maximum of 4 Intelligent Keys can be
registered.
• It is possible to perform a diagnosis on the system and register an Intelligent Key with the CONSULT-III.
OPERATION DESCRIPTION/DOOR LOCK/UNLOCK
• When the BCM detects that each door request switch is pressed, it starts the outside key antenna and inside
key antenna corresponding to the pressed door request swit ch and transmits the request signal to the Intelli-
gent Key. And then, check that t he Intelligent Key is near the door.
• If the Intelligent Key is within the outside key ant enna detection area, it receives the request signal and
transmits the key ID signal to the BCM via remote keyless entry receiver.
• BCM receives the key ID signal and compares it with the registered key ID.
• BCM sends the door lock/unlock signal and sounds Intelli gent Key buzzer warning (lock: 2 times, unlock: 1
time) at the same time as a reminder.
OPERATION CONDITION
If the following conditions are not satisfied, door lock/unlock operation is not performed even if the request
switch is operated.
Door switch Transmits door open/close condition to BCM.
Passenger select unlock relay Enables or disables the unlocking of rear doors when this Intelligent Key option is selected. Item
Function
ALKIA0704GB
Revision: March 2010 2008 QX56

DOOR LOCK FUNCTIONDLK-17
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DOOR REQUEST SWITCH : Component DescriptionINFOID:0000000001538913
INTELLIGENT KEY
INTELLIGENT KEY : System DiagramINFOID:0000000001538914
INTELLIGENT KEY : System DescriptionINFOID:0000000001538915
The Intelligent Key has the same functions as the remote control entry system. In addition to other safety fea-
tures, it can be used to lock and unlock all doors as well as open the back door.
OPERATION DESCRIPTION/DOOR LOCK/UNLOCK FUNCTION
• When door lock/unlock button of the Intelligent Key is pressed, lock signal or unlock signal is transmitted from Intelligent Key to BCM via remote keyless entry receiver and Intelligent Key unit.
• When BCM receives the door lock/unlock signal, it oper ates door lock actuator, flashes the hazard lamp
(lock: 2 times, unlock: 1 time) and horn chirp signal to IPDM E/R at the same time as a reminder.
• IPDM E/R honks horn (lock: 2 times) as a reminder
OPERATION CONDITION
OPERATION AREA
• Operating Range
Item Function
Intelligent Key unit Receives lock/unlock signal from re mote keyless entry receiver, and then transmits to BCM.
BCM Controls the door lock function and room lamp function.
Door lock and unlock switch Transmits lock or unlock signal to BCM.
Door lock actuator Receives lock/unlock signal from BCM and locks/unlocks each door.
Door switch Transmits door open/close condition to BCM.
Remote keyless entry receiver Receives lock/unlock signal from the Intelligent Key, and then transmits to Intelligent Key unit.
Request switch Transmits lock/unlock operation to Intelligent Key unit.
Intelligent Key Transmits button operation to remote keyless entry receiver.
Outside key antenna Detects if Intelligent Key is outside the vehicle.
Inside key antenna Detects if Intelligent Key is inside the vehicle.
Intelligent Key warning buzzer Warns the user of the lock/unlock condition and inappropriate operations with the buzzer sound.
ALKIA0704GB
Remote controller operation Operation conditionOperation
Lock • All doors closed All doors lock
Unlock • Intelligent Key is out of the ignition key cylinder All doors unlock
Revision: March 2010 2008 QX56