INFINITI QX56 2006 Factory Service Manual

LAN-2Revision: November 20092006 QX56
Wiring Diagram — CAN — ..................................
... 98
Check Sheet ........................................................... 99 CHECK SHEET RESULTS (EXAMPLE) .......... .102
TROUBLE DIAGNOSIS FOR SYSTEM ................. .123
Inspection Between TCM and ICC Sensor Circuit .123
Inspection Between TCM and Driver Seat Control
Unit Circuit ........................................................... .124
Inspection Between ICC Sensor and ICC Unit Cir-
cuit ....................................................................... .125
Inspection Between ICC Unit and Driver Seat Con-
trol Unit Circuit ..................................................... .126
Inspection Between Driver Seat Control Unit and
Data Link Connector Circuit ................................. .126
Inspection Between Data Link Connector and ABS
Actuator and Electric Unit (Control Unit) Circuit ... .127
ECM Circuit Inspection ........................................ .128TCM Circuit Inspection .........................................
.129
ICC Sensor Circuit Inspection .............................. .129
ICC Unit Circuit Inspection ................................... .130
Driver Seat Control Unit Circuit Inspection .......... .130
Combination Meter Circuit Inspection .................. .131
Display Control Unit Circuit Inspection ................. .131
BCM Circuit Inspection ........................................ .132
Data Link Connector Circuit Inspection ................ .132
Steering Angle Sensor Circuit Inspection ............. .133
Front Air Control Circuit Inspection ...................... .133
Transfer Control Unit Circuit Inspection ............... .134
ABS Actuator and Electric Unit (Control Unit) Circuit
Inspection ............................................................. .134
IPDM E/R Circuit Inspection ................................ .135
CAN Communication Circuit Inspection ............... .135
IPDM E/R Ignition Relay Circuit Inspection .......... .137

PRECAUTIONSLAN-3
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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.
WARNING:

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, "
TROUBLE DIAGNOSES WORK FLOW" .
Precautions For Trouble DiagnosisUKS0017K
CAN SYSTEM

Do not apply voltage of 7.0 V or higher to the measurement terminals.

Use the tester with its open terminal voltage being 7.0 V or less.

Be sure to turn ignition switch OFF and disconnect the battery cable from the negative terminal before
checking the circuit.

LAN-4
[CAN]
PRECAUTIONS
Revision: November 20092006 QX56
Precautions For Harness RepairUKS0017L
CAN SYSTEM

Solder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (4.33 in).]

Do not perform bypass wire connections for the repair parts.
(The spliced wire will become separated and the characteristics
of twisted line will be lost.)
PKIA0306E
PKIA0307E

TROUBLE DIAGNOSES WORK FLOWLAN-5
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TROUBLE DIAGNOSES WORK FLOWPFP:00004
When Displaying CAN Communication System ErrorsUKS004SS
WHEN A MALFUNCTION IS DETECTED BY CAN COMMUNICATION SYSTEM

CAN communication line is open. (CAN H, CAN L, or both)

CAN communication line is shorted. (Ground, between CAN lines, or other harnesses)

The areas related to CAN communication of unit is malfunctioning.
WHEN A MALFUNCTION IS DETECTED EXCEPT CAN COMMUNICATION SYSTEM

Removal and installation of parts: When the units that perform CAN communication or the sensors related
to CAN communication are removed and installed, malfunction may be detected (or DTC other than CAN
communication may be detected).

Fuse blown out (removed): CAN communication of the unit may be stopped at such time.

Low voltage: If the voltage decreases because of battery discharge when IGN is ON, malfunction may be
detected by self-diagnosis according to the units.

LAN-6
[CAN]
TROUBLE DIAGNOSES WORK FLOW
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TROUBLE DIAGNOSIS FLOW CHART
Depending on the control unit which performs CAN communication, “U1010” may be indicated as the result of
self-diagnosis. Replace the control unit if “U1010” is indicated.

Step 1: Refer to LAN-7, "SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)" .

Step 2: Refer to LAN-8, "ACQUISITION OF DATA BY CONSULT-II" .

Step 3: Refer to LAN-9, "HOW TO USE CHECK SHEET TABLE" .

Step 4: Refer to LAN-10, "Example of Filling in Check Sheet When Initial Conditions Are Reproduced" .

Step 5: Refer to LAN-123, "TROUBLE DIAGNOSIS FOR SYSTEM" .
PKIC3663E

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Diagnosis ProcedureUKS004ST
SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)
Determine CAN system type from the equipment of the vehicle to select applicable check sheet.
PKIC3664E

LAN-8
[CAN]
TROUBLE DIAGNOSES WORK FLOW
Revision: November 20092006 QX56
ACQUISITION OF DATA BY CONSULT-II
Attach the data acquired by CONSULT-II on the check sheet determined according to CAN system type.(For
display control unit, transfer the data from the display screen of the vehicle to the CAN diagnosis support mon-
itor check sheet AV- 1 4 0 , "
CAN Communication Line Check" .)
PKIC4971E

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HOW TO USE CHECK SHEET TABLE
1. Unit names displayed on CONSULT-II
2.“No indication ”: Put a check mark to it if the unit name described in step 1 is not displayed on “SELECT
SYSTEM ” screen of CONSULT-II. (Unit communicating with CONSULT-II via CAN communication line)
“–” : Column not used (Unit communicating with CONSULT-II excluding CAN communication line)
3. “NG”: Display “NG” when malfunction is detected in the initial diagnosis of the diagnosed unit. Replace the
unit if “NG” is displayed.
“–” : Column not used (Initial diagnosis is not performed.)
4. “UNKWN”: Display “UNKWN” when the diagnosed unit does not transmit the data normally. Put a check
mark to it if “UNKWN” is displayed on CONSULT-II.
“–” : Column not used (Transmit diagnosis is not performed.)
5. “UNKWN”: Display “UNKWN ” when the diagnosed unit does not receive the data normally. Put a check
mark to it if “UNKWN” is displayed on CONSULT-II.
“–” : Column not used (It is not necessary for CAN communication trouble diagnosis.)
NOTE:
CAN communication diagnosis checks if CAN communication works normally. (Contents of data are not diag-
nosed.)

When the initial conditions are reproduced, refer to LAN-10, "Example of Filling in Check Sheet When Ini-
tial Conditions Are Reproduced" .

When the initial conditions are not reproduced, refer to LAN-14, "Example of Filling in Check Sheet When
Initial Conditions Are Not Reproduced" .
PKIC3656E

LAN-10
[CAN]
TROUBLE DIAGNOSES WORK FLOW
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Example of Filling in Check Sheet When Initial Conditions Are Reproduced
1. Put a check mark to “No indication” if some of unit names listed on the column of diagnosis system selec-
tion screen of a check sheet table are not displayed on “SELECT SYSTEM” screen attached to the check
sheet.
NOTE:
Put a check mark to “No indication” of AUTO DRIVE POS. because AUTO DRIVE POS. is not displayed
on “SELECT SYSTEM ” screen.
2. Confirm the unit name that “UNKWN” is displayed from the copy of “CAN DIAG SUPPORT MNTR” screen
of “ENGINE ” attached to the check sheet, and then put a check mark to the check sheet table.
NOTE:
In “CAN DIAG SUPPORT MNTR ” screen, “UNKWN” is displayed on “VDC/TCS/ABS”, “METER/M&A ”,
“BCM/SEC ” and “IPDM E/R ”. Put a check mark to it.
3. Confirm the unit name that “UNKWN” is displayed on the copy of “CAN DIAG SUPPORT MNTR ” screen
of “A/T ” as well as “ENGINE”. And then, put a check mark to the check sheet table.
NOTE:

For “A/T ”, “UNKWN ” is displayed on “VDC/TCS/ABS”, “METER/M&A ”, “ICC/e4WD ” and “AWD/4WD ”.
But put a check mark to “VDC/TCS/ABS” and “METER/M&A ” because “UNKWN ” is listed on the col-
umn of reception diagnosis of the check sheet table.
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4. Display control unit reads the CAN diagnosis support monitor check sheet (B) AV- 1 4 0 , "CAN Communi-
cation Line Check" transferred from the display screen (A). The transferred CAN diagnosis support mon-
itor check sheet is copied to the Check sheet, and conversed according to the Display control unit
Translation Sheet (C). And then put a check mark to the check sheet table.
NOTE:
In the CAN diagnosis support monitor check sheet (B), check marks are put to “CAN CIRC 3”, “CAN CIRC
6 ”, “CAN CIRC 8 ” and “CAN CIRC 9 ”. But, in the column of the check sheet table indication in Display
control unit Translation Sheet (C), “ECM” is listed only for “CAN CIRC 3”. Therefore, put a check mark to
“ECM ” because “UNKWN” is listed on the column of reception diagnosis of the check sheet table.
PKIC3658E