2009 INFINITI QX56 electric

MWI
METER SYSTEMMWI-17
< FUNCTION DIAGNOSIS >
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O PODO/TRIP METER : Component DescriptionINFOID:0000000003776612
SHIFT POSITION INDICATOR
SHIFT POSITION INDICATOR : System DiagramINFOID:0000000003776613
SHIFT POSITION INDICATOR : System DescriptionINFOID:0000000003776614
The TCM receives A/T indicator signals from the tr ansmission range switch. The TCM then sends A/T position
indicator signals to the combination meter via CAN co mmunication lines. The combination meter indicates the
received shift position.
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
Unit Description
Combination meter Converts the vehicle speed signal
received from the ABS actuator and electric unit (control unit) via
CAN communication to mileage, and it displays the accumulated mileage to the odo/trip meter.
ABS actuator and electric unit
(control unit) Transmits the vehicle speed signal to the combination meter via CAN communication.
AWNIA1906GB
Revision: December 20092009 QX56

MWI-18
< FUNCTION DIAGNOSIS >
METER SYSTEM
SHIFT POSITION INDICATOR : Component Parts Location
INFOID:0000000003776615
SHIFT POSITION INDICATOR : Component DescriptionINFOID:0000000003776616
WARNING LAMPS/INDICATOR LAMPS
WARNING LAMPS/INDICATOR LAMPS : System DiagramINFOID:0000000003776617
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control
unit) E125 6. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Displays the shift position on the information display using shift position signal received from TCM.
TCM Transmits the shift position signal to the combination meter via CAN communication.
JSNIA0449GB
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-19
< FUNCTION DIAGNOSIS >
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WARNING LAMPS/INDICATOR LAMPS : System DescriptionINFOID:0000000003776618
OIL PRESSURE WARNING LAMP
• IPDM E/R reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch sig-
nal to the combination meter via BCM with the CAN communication line.
• The combination meter turns the oil pressure warning lamp ON/OFF according to the oil pressure switch sig- nal received via CAN communication.
WARNING LAMPS/INDICATOR LAMPS : Component Parts LocationINFOID:0000000003776619
WARNING LAMPS/INDICATOR LAMPS : Component DescriptionINFOID:0000000003776620
INFORMATION DISPLAY
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Turns the oil pressure warning lamp ON/OFF according to the oil pressure switch signal received
from BCM by means of communication.
IPDM E/R Reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch signal
to the combination meter via BCM with the CAN communication line.
Oil pressure switch Refer to MWI-35, "
Description".
BCM Transmits the oil pressure switch signal received from IPDM E/R via CAN communication to the
combination meter via CAN communication.
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-21
< FUNCTION DIAGNOSIS >
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INFORMATION DISPLAY : Co mponent Parts LocationINFOID:0000000003776623
INFORMATION DISPLAY : Component DescriptionINFOID:0000000003776624
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Controls the information display according to the signal received from each unit.
Fuel level sensor unit Refer to MWI-33, "
Description".
BCM Transmits signals provided by various units to the combination meter via CAN communication line.
Washer level switch Transmits the washer level signal to the combination meter.
Parking brake switch Refer to MWI-36, "
Description".
Door switch Transmits the door switch signals to BCM.
Back door latch (door ajar switch) Transmits the back door switch signal to BCM.
Glass hatch ajar switch Transmits the glass hatch ajar switch signal to BCM.
TCM Transmits A/T oil temperature signal to the combination meter with CAN communication line.
Revision: December 20092009 QX56

MWI
DTC B2205 VEHICLE SPEED CIRCUITMWI-29
< COMPONENT DIAGNOSIS >
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DTC B2205 VEHICLE SPEED CIRCUIT
DescriptionINFOID:0000000003776630
The ABS actuator and electric unit (control unit) provi des a vehicle speed signal to the combination meter via
CAN communication lines.
DTC LogicINFOID:0000000003776631
Diagnosis ProcedureINFOID:0000000003776632
Symptom: Displays “VEHICLE SPEED CIRC [B2205]” as a self-diagnosis result of combination meter.
1.CHECK COMBINATION METER INPUT SIGNAL
1. Start engine and select “M ETER/M&A” on CONSULT-III.
2. Using “SPEED METER” on “DATA MONITOR”, compare the value of DATA MONITOR with speedometer
pointer of combination meter. Speedometer and DATA MONITOR indications should be close.
Is the inspection result normal?
YES >> Perform ABS actuator and electric uni t (control unit) self-diagnosis. Refer to BRC-24, "CONSULT-
III Function (ABS)".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
DTC CONSULT-III display Detection condition
B2205 VEHICLE SPEED CIRC
[B2205]
Malfunction is detected when an erroneous speed signal is received for 2 seconds or more.
Revision: December 20092009 QX56

MWI-100
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005867495
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:0000000005867496
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

PB-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005867887
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:0000000005867888
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
PCS-1
ELECTRICAL & POWER CONTROL
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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 ................................................... ....21
Wiring Diagram ........................................................26
Fail Safe ..................................................................29
DTC Index ...............................................................31
PRECAUTION ..............................................32
PRECAUTIONS .................................................32
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
32
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ...................................
32
REMOVAL AND INSTALLATION ...............34
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
34
Removal and Installation of IPDM E/R ................ ....34
Revision: December 20092009 QX56