2005 INFINITI QX4 Factory Service Manual

lock change wheel trunk ABS rear entertainment sport mode

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INFINITI QX4 2005 Factory Service Manual LAN-2Revision: October 20052005 QX56 IPDM E/R Ignition Relay Circuit Check ................... 89
Component Inspection ............................................ 89
ECM/IPDM E/R INTERNAL CIRCUIT IN

LAN-2Revision: October 20052005 QX56 IPDM E/R Ignition Relay Circuit Check ................... 89
Component Inspection ............................................ 89
ECM/IPDM E/R INTERNAL CIRCUIT INSPEC-
TION .................................................................... 89
CAN SYSTEM (TYPE 3) ........................................... 90
System Description ................................................. 90
Component Parts and Harness Connector Location ... 90
Schematic ............................................................... 91
Wiring Diagram - CAN - .......................................... 92
Work Flow ............................................................... 95
CHECK SHEET ................................................... 97
CHECK SHEET RESULTS (EXAMPLE) ............. 99
Circuit Check Between TCM and Driver Seat Con-
trol Unit .................................................................115
Circuit Check Between Driver Seat Control Unit and
Data Link Connector .............................................116
Circuit Check Between Data Link Connector and
IPDM E/R ..............................................................117
ECM Circuit Check ...............................................118
TCM Circuit Check ...............................................118
Driver Seat Control Unit Circuit Check .................119
Combination Meter Circuit Check .........................119
Display Control Unit Circuit Check ........................120
BCM Circuit Check ...............................................120
Data Link Connector Circuit Check .......................121
Steering Angle Sensor Circuit Check ...................121
Front Air Control Circuit Check .............................122
Transfer Control Unit Circuit Check ......................122
ABS Actuator and Electric Unit (Control Unit) Circuit
Check ...................................................................123
IPDM E/R Circuit Check .......................................123
CAN Communication Circuit Check ......................124
IPDM E/R Ignition Relay Circuit Check .................124
Component Inspection ..........................................125
ECM/IPDM E/R INTERNAL CIRCUIT INSPEC-
TION ..................................................................125CAN SYSTEM (TYPE 4) .......................................... 126
System Description ............................................... 126
Component Parts and Harness Connector Location . 126
Schematic ............................................................. 127
Wiring Diagram - CAN - ........................................ 128
Work Flow ............................................................. 131
CHECK SHEET ................................................. 133
CHECK SHEET RESULTS (EXAMPLE) ............ 136
Circuit Check Between TCM and ICC Sensor ...... 156
Circuit Check Between ICC Sensor and ICC Unit . 157
Circuit Check Between ICC Unit and Driver Seat
Control Unit ........................................................... 158
Circuit Check Between Driver Seat Control Unit and
Data Link Connector ............................................. 158
Circuit Check Between Data Link Connector and
IPDM E/R .............................................................. 159
ECM Circuit Check ................................................ 160
TCM Circuit Check ................................................ 160
ICC Sensor Circuit Check ..................................... 161
ICC Unit Circuit Check .......................................... 161
Driver Seat Control Unit Circuit Check .................. 162
Combination Meter Circuit Check ......................... 162
Display Control Unit Circuit Check ........................ 163
BCM Circuit Check ................................................ 163
Data Link Connector Circuit Check ....................... 164
Steering Angle Sensor Circuit Check .................... 164
Front Air Control Circuit Check ............................. 165
Transfer Control Unit Circuit Check ...................... 165
ABS Actuator and Electric Unit (Control Unit) Circuit
Check .................................................................... 166
IPDM E/R Circuit Check ........................................ 166
CAN Communication Circuit Check ...................... 167
IPDM E/R Ignition Relay Circuit Check ................. 167
Component Inspection .......................................... 168
ECM/IPDM E/R INTERNAL CIRCUIT INSPEC-
TION .................................................................. 168

Page 2282 of 3419

INFINITI QX4 2005 Factory Service Manual PRECAUTIONS
LAN-3
[CAN]
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Revision: October 20052005 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONE

PRECAUTIONS
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UKS0017I
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 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WA RN ING:
To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer.
Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions When Using CONSULT-IIUKS0017J
When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
CHECK POINTS FOR USING CONSULT-II
1. Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
–If YES, GO TO 2.
–If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis
results?
–If YES, GO TO 3.
–If NO, GO TO 4.
3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection.
4. Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
tion. Therefore, erase the self-diagnosis results.
5. Diagnose CAN communication system. Refer to LAN-5, "
CAN Communication Unit" .
Precautions For Trouble DiagnosisUKS0017K
CAN SYSTEM
Do not apply voltage of 7.0V or higher to the measurement terminals.
Use the tester with its open terminal voltage being 7.0V or less.
Be sure to turn ignition switch off and disconnect negative battery terminal before checking the circuit.

Page 2283 of 3419

INFINITI QX4 2005 Factory Service Manual LAN-4
[CAN]
PRECAUTIONS
Revision: October 20052005 QX56
Precautions For Harness RepairUKS0017L
CAN SYSTEM
Solder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (

Page 2284 of 3419

INFINITI QX4 2005 Factory Service Manual CAN COMMUNICATION
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Revision: October 20052005 QX56
CAN COMMUNICATIONPFP:23710
System DescriptionUKS000NU
CAN (Controller Area Network) is a serial communication l

Page 2285 of 3419

INFINITI QX4 2005 Factory Service Manual LAN-6
[CAN]
CAN COMMUNICATION
Revision: October 20052005 QX56
Input/output signal chart
T: Transmit R: Receive
Signals ECM TCMDriver
seat
con-
trol
unitCom-
bina-
tion
meterDis-
play
con-
trol

Page 2286 of 3419

INFINITI QX4 2005 Factory Service Manual CAN COMMUNICATION
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Revision: October 20052005 QX56
Fuel level sensor signal R T
Fuel level low warning signal T R
ASCD SET lamp signal T R
ASCD CRUISE lamp signal

Page 2287 of 3419

INFINITI QX4 2005 Factory Service Manual LAN-8
[CAN]
CAN COMMUNICATION
Revision: October 20052005 QX56
TYPE2
System diagram
Type2
Input/output signal chart
T: Transmit R: Receive
PKIA8134E
Signals ECM TCMICC
sen-
sorICC
unitDriver
seat

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INFINITI QX4 2005 Factory Service Manual CAN COMMUNICATION
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Revision: October 20052005 QX56
A/C switch/indicator signalTR
RT
Cooling fan speed request signal T R R
Position light request signal R T R
Low

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