2009 INFINITI QX56 steering

PCS-32
< PRECAUTION >[IPDM E/R]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005851897
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:0000000005851898
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: December 20092009 QX56

PCS
PRECAUTIONSPCS-33
< PRECAUTION > [IPDM E/R]
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5. When the repair work is completed, return the ignition switch to the
″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Revision: December 20092009 QX56

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PG-1
ELECTRICAL & POWER CONTROL
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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 ....................64
Electrical Units Location ..........................................64
HARNESS CONNECTOR .................................67
Description ...............................................................67
STANDARDIZED RELAY .................................70
Description ...............................................................70
FUSE BLOCK - JUNCTION BOX (J/B) ............72
Terminal Arrangement .............................................72
FUSE, FUSIBLE LINK AND RELAY BOX ........73
Terminal Arrangement .............................................73
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
75
IPDM E/R Terminal Arrangement ............................75
ON-VEHICLE REPAIR .................................76
BATTERY ..........................................................76
Removal and Installation ..................................... ....76
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... ...
77
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
77
Battery ................................................................. ....77
Revision: December 20092009 QX56

PG-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005852239
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:0000000005852240
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: December 20092009 QX56

PG
PRECAUTIONSPG-3
< PRECAUTION >
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5. When the repair work is completed, return the ignition switch to the
″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Precaution for Power Generation Variable Voltage Control SystemINFOID:0000000003776561
CAUTION:
For this model, the battery current sensor that is installed to the negative battery cable measures the
charging/discharging current of the battery and performs various engine controls. If an electrical com-
ponent is connected directly to the negative battery terminal, the current flowing through that compo-
nent will not be measured by the battery current sensor. This condition may cause a malfunction of
the engine control system and battery discharge m ay occur. Do not connect an electrical component
or ground wire directly to the battery terminal.
Revision: December 20092009 QX56

PG-8
< BASIC INSPECTION >
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
ADDITIONAL SERVICE WHEN REMOVING BATTERY NEGATIVE TERMINAL
ADDITIONAL SERVICE WHEN REMOVING BATTERY NEGATIVE TERMINAL : Spe-
cial Repair Requirement
INFOID:0000000005864655
Required Procedure After Battery Disconnection
System ItemReference
Engine Control Idle Air Volume Learning Refer to EC-18
.
Brake Control Steering Angle Sensor Neutral Position Refer to BRC-8
.
Glasses, Window and Mirrors Power Window System Initialization Refer to TSB.
Body, Lock & Security Automatic Back Door Initialization Refer to DLK-9
.
Roof Sunroof Memory Reset/Initialization Refer to RF-5
.
Seats Automatic Drive Positioner System Initialization Refer to Owner's Manual.
Audio-Visual System Audio (Radio Preset)
Refer to Owner's Manual.
Navigation System Refer to Owner's Manual.
Rear View Monitor Guiding Line Adjustment Refer to AV- 7
.
Revision: December 20092009 QX56

PG-44
< COMPONENT DIAGNOSIS >
HARNESS
A3 M6 W/10 : To E10A3 M82 W/2 : Circuit breaker-2
A2 M7 B/5 : Passenger select unlock relay G4 M84 W/16 : To B101
A3 M8 W/16 : To D2 A3 M85 W/3 : Tilt motor assembly
A2 M9 BR/24 : To D1 B3 M86 W/2 : Tilt motor assembly
A3 M10 Y/4 : To E29 B3 M87 B/5 : Rear power vent window relay (open)
A3 M11 B/1 : Parking brake switch B3 M89 B/5 : Rear power vent window relay (close)
C3 M12 GR/6 : Key switch and ignition knob switch B3 M91 W/16 : To E26
D3 M13 BR/2 : Front passenger air bag OFF indicator A2 M92 B/6 : Power liftgate switch
A2 M14 GR/6 : Diode-3 D1 M93 W/24 : Display unit
B3 M15 W/4 : Steering lock solenoid A2 M95 W/6 : Rear power vent window switch
A2 M16 GR/6 : ADP steering switch A2 M96 BR/6 : Pedal adjusting switch
B2 M17 W/8 : Steering angle sensor C2 M98 W/16 : A/C and AV switch assembly
C2 M18 W/40 : BCM (body control module) C3 M99 BR/2 : Foot lamp LH
C2 M19 W/15 : BCM (body control module) F4 M100 BR/2 : Foot lamp RH
C2 M20 B/15 : BCM (body control module) E3 M104 W/4 : Aux jack
C3 M21 W/4 : NATS antenna AMP. F2 M105 Y/2 : Front passenger air bag module
C3 M22 W/16 : Data link connector F2 M106 O/2 : Front passenger air bag module
B1 M23 W/12 : Combination meter F3 M107 B/5 : Front blower relay
C1 M24 W/40 : Combination meter D5 M108 B/6 : Yaw rate/ side/ decel G sensor
F2 M25 B/4 : Remote keyless entry receiver A1 M109 BR/2 : Front tweeter LH
B2 M26 W/6 : Ignition switch D2 M110 BR/2 : Center speaker
B2 M28 W/16 : Combination switch F2 M111 BR/2 : Front tweeter RH
B2 M29 Y/6 : Combination switch (spiral cable) C2 M112 BR/14 : BOSE speaker amp.
B3 M30 GR/8 : Combination switch (spiral cable) C2 M113 BR/23 : BOSE speaker amp.
G4 M31 SMJ : To E152 A2 M116 GR/8 : Sonar system OFF switch
C3 M32 W/4 : In-vehicle sensor A2 M117 GR/8 : Rear sonar system OFF switch
B3 M33 W/32 : Automatic drive position control unit B1 M118 B/2 : Front sonar buzzer
B3 M34 W/16 : Automatic drive position control unit F2 M120 W/4 : Remote keyless entry receiver
C5 M35 Y/28 : Air bag diagnosis sensor unit F4 M122 W/4 : Variable blower control (front)
G4 M36 SMJ : To B149 C3 M123 W/2 : Tire pressure warning check connector
G3 M37 B/1 : Fuse block (J/B) D2 M139 B/2 : Diode-1
G3 M38 B/2 : Fuse block (J/B) D1 M140 B/2 : Diode-2
D3 M39 W/8 : Fuse block (J/B) C2 M141 GR/8 : 4WD shift switch
A3 M40 SMJ : To B69 E1 M142 B/6 : Mode door motor (front)
D2 M42 W/20 : AV control unit E3 M143 B/6 : Air mix door motor (passenger)
D2 M43 W/12 : AV control unit C1 M144 B/6 : Defroster door motor
D2 M44 W/32 : AV control unit E3 M146 GR/2 : Intake sensor
D3 M45 W/40 : AV control unit D3 M147B/6 : Air mix doo r motor (driver)
B1 M47 B/2 : Sonar buzzer D2 M148 W/4 : Headlamp aiming switch
D2 M49 B/26 : A/C auto amp. D3 M149 W/4 : Clock
D2 M50 L/26 : A/C auto amp. B1 M150 W/2 : Ignition keyhole illumination
B3 M51 L/4 : Trailer tow relay 1 A3 M158 W/10 : To D3
B2 M52 W/2 : Combination switch (spiral cable) Console sub-harness
D3 M53 B/3 : Front power socket LH D4 M201 W/16 : To M56
E3 M54 B/3 : Front power socket RH (for cigarette
lighter) D4 M202 BR/24 : To M64
Revision: December 20092009 QX56

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< COMPONENT DIAGNOSIS >
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D2 M55 W/4 : Hazard switch
D4 M203 W/12 : A/T shift selector
D4 M56 W/16 : To M201 D5 M205 W/32 : DVD player
A3 M57 — : Body ground D5 M207 B/3 : Console power socket
F2 M58 B/6 : Intake door motor C4 M208 BR/20 : To M69
F3 M59 BR/2 : Glove box lamp C5 M209 W/2: Inside key antenna 2 (rear of center
console)
G3 M60 W/6 : Fuse block (J/B) C4 M210 GR/2: Inside key antenna 3 (front of center
console)
C3 M61 — : Body ground C4 M212 W/6 : Rear heated seat switch LH
F4 M62 B/2 : Front blower motor C4 M213 BR/6 : Rear heated seat switch RH
D4 M63 BR/20 : To M251 Console switch sub-harness
D4 M64 BR/24 : To M202 D4 M251 BR/20 : To M63
F2 M65 W/4 : To M301 D4 M252 BR/6 : Front heated seat switch RH
G3 M66 B/1 : To E33 C4 M253 GR/6 : VDC OFF switch
C3 M69 BR/20 : To M208 C3 M255 W/6 : Front heated seat switch LH
A2 M70 W/40 : Intelligent key unit C4 M256 B/2 : A/T shift selector
A2 M71 L/4 : Heated steering relay C4 M260 W/6 : Heated steering wheel switch
D3 M73 BR/6 : Back-up lamp relay Optical sensor sub-harness
G3 M74 BR/24 : To D102 F1 M301 W/4 : To M65
G3 M75 W/10 : To D101 D1 M302 B/4 : Optical sensor
A3 M76 W/6 : Electric brake (pre-wiring)
E2 M77 Y/4 : Front passenger air bag module
(service replacement)
Revision: December 20092009 QX56