2010 INFINITI QX56 belt

PCS
PCS-1
ELECTRICAL & POWER CONTROL
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SECTION PCS
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CONTENTS
POWER CONTROL SYSTEM
IPDM E/R
BASIC INSPECTION ....... .............................
2
DIAGNOSIS AND REPAIR WORKFLOW ..... .....2
Work Flow ........................................................... ......2
FUNCTION DIAGNOSIS ...............................5
RELAY CONTROL SYSTEM ......................... .....5
System Diagram .................................................. ......5
System Description ...................................................6
Component Parts Location ........................................7
POWER CONTROL SYSTEM .............................8
System Diagram .................................................. ......8
System Description ...................................................8
SIGNAL BUFFER SYSTEM ................................9
System Diagram .................................................. ......9
System Description ...................................................9
POWER CONSUMPTION CONTROL SYS-
TEM ....................................................................
10
System Diagram .................................................. ....10
System Description .................................................10
Component Parts Location ......................................11
DIAGNOSIS SYSTEM (IPDM E/R) .....................12
Diagnosis Description ......................................... ....12
CONSULT - III Function (IPDM E/R) .......................14
COMPONENT DIAGNOSIS .........................17
U1000 CAN COMM CIRCUIT ...........................17
Description ........................................................... ....17
DTC Logic ................................................................17
Diagnosis Procedure ...............................................17
POWER SUPPLY AND GROUND CIRCUIT ....18
Diagnosis Procedure ...............................................18
ECU DIAGNOSIS .........................................19
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
19
Reference Value .................................................. ....19
Terminal Layout .......................................................21
Physical Values ................................................... ....22
Wiring Diagram ........................................................27
Fail Safe ..................................................................30
DTC Index ...............................................................32
PRECAUTION ..............................................33
PRECAUTIONS .................................................33
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
33
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ...................................
33
REMOVAL AND INSTALLATION ...............35
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
35
Removal and Installation of IPDM E/R ................ ....35
Revision: April 20092010 QX56

PCS
PRECAUTIONSPCS-33
< PRECAUTION > [IPDM E/R]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental
Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005367635
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000005367636
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecti ng both battery cables with the ignition knob in the
″ LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS , an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
Revision: April 20092010 QX56

PG
PG-1
ELECTRICAL & POWER CONTROL
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SECTION PG
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CONTENTS
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
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
BATTERY ....................................................... .....5
How to Handle Battery ........................................ ......5
Work Flow ........................................................... ......7
INSPECTION AND ADJUSTMENT .....................8
ADDITIONAL SERVICE WHEN REMOVING BAT-
TERY NEGATIVE TERMINAL ............................... ......
8
ADDITIONAL SERVICE WHEN REMOVING
BATTERY NEGATIVE TERMINAL : Special Re-
pair Requirement ................................................. ......
8
COMPONENT DIAGNOSIS ..........................9
POWER SUPPLY ROUTING CIRCUIT .......... .....9
Wiring Diagram — Battery Power Supply — ....... ......9
Wiring Diagram — Accessory Power Supply — .....18
Wiring Diagram — Ignition Power Supply — ..........22
Fuse ........................................................................30
Fusible Link .............................................................30
GROUND ...........................................................31
Ground Distribution .............................................. ....31
HARNESS .........................................................41
Harness Layout ................................................... ....41
ELECTRICAL UNITS LOCATION ....................61
Electrical Units Location ..........................................61
HARNESS CONNECTOR .................................64
Description ...............................................................64
STANDARDIZED RELAY .................................67
Description ...............................................................67
FUSE BLOCK - JUNCTION BOX (J/B) ............69
Terminal Arrangement .............................................69
FUSE, FUSIBLE LINK AND RELAY BOX ........70
Terminal Arrangement .............................................70
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
72
IPDM E/R Terminal Arrangement - Type A .............72
IPDM E/R Terminal Arrangement - Type B .............73
ON-VEHICLE REPAIR .................................74
BATTERY ..........................................................74
Removal and Installation ..................................... ....74
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... ...
75
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
75
Battery ................................................................. ....75
Revision: April 20092010 QX56

PG-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005260236
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005260237
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: April 20092010 QX56

PG-52
< COMPONENT DIAGNOSIS >
HARNESS
G3 B3 W/16 : Suspension control unitC5 B69 SMJ : To M40
E4 B6 W/18 : To D201 G2 B70 GR/3 : Rear combination lamp LH
C5 B7 — : Body ground D5 B72 BR/6 : Subwoofer
D4 B8 W/3 : Front door switch LH F3 B73 W/16 : Rear view camera control unit
C4 B9 Y/12 : Air bag diagnosis sensor unit C4 B74 Y/4 : Seat belt buckle pre-tensioner assembly LH
E5 B10 Y/2 : Front LH side air bag module F2 B75 W/10 : To B400
F3 B13 W/24 : ICC unit F2 B76 GR/2 : Luggage area antenna
E5 B14 Y/2 : Front LH seat belt pre-tensioner C3 B78 W/3 : Rear seat heater RH
E5 B15 Y/2 : LH side air bag (satellite) sensor E3 B79 W/3 : Rear seat heater LH
G3 B17 GR/24 : ICC unit Front seat LH harness
E3 B18 W/3 : Rear door switch LH D3 B200 W/16 : To B37
G1 B19 — : Body ground D5 B202 W/32 : Driver seat control unit
G2 B24 W/16 : Sonar control unit D5 B203 W/16 : Driver seat control unit
B4 B32 W/6 : To B124 C5 B204 GR/5 : Sliding motor LH
G2 B35 B/3 : Rear combination lamp LH D3 B205 W/4 : Reclining motor LH
D3 B37 W/16 : To B200 C4 B206 GR/5 : Lifting motor (front)
C5 B38 Y/2 : LH side front curtain air bag module D4 B207 GR/5 : Lifting motor (rear)
C5 B40 W/24 : To E34 D4 B208 W/10 : Power seat switch LH
C5 B41 W/12 : To E35 D4 B209 W/3 : Front seat heater LH
C5 B42 W/2 : To E36 D5 B210 W/4 : Lumbar support switch
B4 B43 W/16 : To B111 E5 B211 B/2 : Lumbar support motor
F1 B48 W/18 : To D401 Third row power folding seat sub-harness
F1 B49 W/2 : To D402 F2 B400 W/10 : To B75
F2 B52 W/2 : Rear power vent window motor LH E3 B401 GR/12 : Third row power folding seat control unit
F2 B54 Y/2 : LH side rear curtain air bag module E3 B402 W/10 : Third row power folding seat control unit
G3 B55 W/26 : Back door control unit F3 B403 GR/4 : Third row power folding seat motor LH
F2 B56 GR/16 : Sonar control unit (with front and rear
sonar system) E2 B404 W/4 : To B425
G2 B57 GR/10 : Sonar control unit (with front and rear
sonar system) E3 B425 W/4 : To B404
G1 B63 W/6 : Back door close switch E2 B426 GR/4 : Third row power folding seat motor RH
Revision: April 20092010 QX56

PG-54
< COMPONENT DIAGNOSIS >
HARNESS
ROOM LAMP HARNESS
F4 B111 W/16 : To B43B2 B153 W/2 : Cargo lamp
E3 B113 Y/12 : Air bag diagnosis sensor unit E5 B154 W/2 : To B303
D5 B114 Y/2 : RH side air bag (satellite) sensor B3 B155 B/6 : Air mix door motor (rear)
C3 B116 W/3 : Rear door switch RH B3 B156 B/6 : Mode door motor (rear)
F5 B117 — : Body ground E5 B157 Y/4 : Seat belt buckle pre-tensioner assembly RH
E5 B118 W/3 : Front seat heater RH C3 B162 BR/6: Third row power folding seat switch
passenger side (front)
A2 B119 W/2 : Condenser-3 A3 B163 W/6: Third row power folding seat switch
passenger side (rear)
A2 B120 W/2 : Condenser-4 C3 B164 W/6: Third row power folding seat switch
driver side (front)
F4 B124 W/6 : To B32 A3 B165 BR/6: Third row power folding seat switch
driver side (rear)
E4 B126 Y/2 : Front RH side air bag module B2 B166 B/2 : Rear sonar buzzer
D4 B127 Y/2 : Front RH seat belt pre-tensioner Front seat RH harness
C3 B128 Y/2 : RH side rear curtain air bag module E5 B303 W/2 : To B154
F3 B129 Y/2 : RH side front curtain air bag module E4 B308 W/10 : Power seat switch RH
A3 B130 GR/3 : Rear combination lamp RH E4 B309 GR/2 : Sliding motor RH
A3 B132 — : Body ground E5 B310 GR/2 : Lifting motor RH (rear)
A3 B133 W/4 : Variable blower control (re ar)E4 B311 GR/2 : Lifting motor RH (front)
B3 B134 W/2 : Rear blower motor E4 B350 W/8 : To B136
E3 B136 W/8 : To B350 E4 B351 B/18 : Occupant classification system control unit
D5 B137 W/3 : Belt tension sensor E4 B352 B/3 : Occupant classification system sensor
B2 B138 B/3 : Rear cargo power sock etE4 B372 W/2 : Reclining motor RH
A1 B139 W/16 : To D602
Revision: April 20092010 QX56

PG-66
< COMPONENT DIAGNOSIS >
HARNESS CONNECTOR
• Always confirm the lever is fully released (loosened) before attempting to disconnect or connect
these connectors to avoid damage to the connector housing or terminals.
HARNESS CONNECTOR (DIRECT-CONNECT SRS COMPONENT TYPE)
• SRS direct-connect type harness connectors are used on certain SRS components such as air bag modules
and seat belt pre-tensioners.
• Always pull up to release black locking tab prior to removing connector from SRS components.
• Always push down to lock black locking tab afte4r installing connector to SRS components.n When locked, the black locking tab is level with the connector housing.
CAUTION:
• Do not pull the harness or wi res when removing connectors
from SRS components.
1. Control unit with single lever 2. Control unit with dual lever 3. SMJ connector
A. Fasten A. FastenA. Fasten
B.Loosen B.LoosenB.Loosen
C.Lever C.Lever C.Lever
LKIA0670E
WHIA0103E
Revision: April 20092010 QX56

PWC-3
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ANTI-PINCH SYSTEM DOES NOT OPERATE
NORMALLY (PASSENGER SIDE) ................ ..
103
Diagnosis Procedure ........................................... ..103
ANTI-PINCH SYSTEM DOES NOT OPERATE
NORMALLY (REAR LH SIDE) .........................
104
Diagnosis Procedure ........................................... ..104
ANTI-PINCH SYSTEM DOES NOT OPERATE
NORMALLY (REAR RH SIDE) ........................
105
Diagnosis Procedure ........................................... ..105
AUTO OPERATION DOES NOT OPERATE
BUT MANUAL OPERATES NORMALLY
(DRIVER SIDE) .................................................
106
Diagnosis Procedure .............................................106
AUTO OPERATION DOES NOT OPERATE
BUT MANUAL OPERATES NORMALLY
(PASSENGER SIDE) ...................................... ..
107
Diagnosis Procedure ........................................... ..107
AUTO OPERATION DOES NOT OPERATE
BUT MANUAL OPERATES NORMALLY
(REAR LH SIDE) ..............................................
108
Diagnosis Procedure ........................................... ..108
AUTO OPERATION DOES NOT OPERATE
BUT MANUAL OPERATES NORMALLY
(REAR RH SIDE) ..............................................
109
Diagnosis Procedure ........................................... ..109
POWER WINDOW RETAINED POWER OP-
ERATION DOES NOT OPERATE PROPERLY
..
110
Diagnosis Procedure ........................................... ..110
DOES NOT OPERATE BY KEY CYLINDER
SWITCH ...........................................................
111
Diagnosis Procedure ........................................... ..111
KEYLESS POWER WINDOW DOWN DOES
NOT OPERATE ...............................................
112
Diagnosis Procedure .............................................112
POWER WINDOW LOCK SWITCH DOES
NOT FUNCTION ..............................................
113
Diagnosis Procedure .............................................113
REAR POWER VENT WINDOWS DO NOT
OPERATE .......................................................
114
Diagnosis Procedure .............................................114
PRECAUTION ............................................115
PRECAUTIONS ...............................................115
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
115
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .................................
115
ON-VEHICLE REPAIR ...............................117
POWER WINDOW MAIN SWITCH .................117
Removal and Installation ..................................... ..117
FRONT POWER WINDOW SWITCH ..............118
Removal and Installation .......................................118
REAR POWER WINDOW SWITCH ................119
Removal and Installation .......................................119
REAR POWER VENT WINDOW SWITCH .....120
Removal and Installation .......................................120
Revision: April 20092010 QX56