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LAN

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K ELECTRICAL

B
SECTION
LAN SYSTEM C

E
CONTENTS
CAN FOR DISPLAY UNIT ........................................... 22 . F
DESCRIPTION OF "CAN DIAG SUPPORT
PRECAUTIONS ......................................................... 3 . MNTR" SCREEN FOR DISPLAY CONTROL
Precautions for Supplemental Restraint System UNIT ................................................................... 23
. G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- CAN COMMUNICATION .......................................... 24 .
SIONER" ................................................................. 3
. System Description ................................................ 24.
Precautions When Using CONSULT-II .................... 3 . Component Parts and Harness Connector Location 24 ...
CHECK POINTS FOR USING CONSULT-II ........ 3 . H
Schematic .............................................................. 25
.
Precautions for CAN System .................................. 3 . Wiring Diagram -- CAN -- .................................... 26 .
TROUBLE DIAGNOSES WORK FLOW ................... 5 . CAN Communication Unit ...................................... 29 .
When Displaying CAN Communication System TYPE 1 ............................................................... 30
. I
Errors ...................................................................... 5
. TYPE 2/TYPE 3 .................................................. 32 .
WHEN A MALFUNCTION IS DETECTED BY TYPE 4/TYPE 5 .................................................. 35 .
CAN COMMUNICATION SYSTEM ...................... 5 . CAN SYSTEM (TYPE 1) .......................................... 38 . J
WHEN A MALFUNCTION IS DETECTED Component Parts and Harness Connector Location 38 ...
EXCEPT CAN COMMUNICATION SYSTEM ....... 5 . Schematic .............................................................. 38
.
TROUBLE DIAGNOSIS FLOW CHART .............. 6 . Wiring Diagram -- CAN -- .................................... 38 .
Diagnosis Procedure ............................................... 7 . LAN
Check Sheet .......................................................... 39
.
SELECTING CAN SYSTEM TYPE (HOW TO CHECK SHEET RESULTS (EXAMPLE) ............ 41 .
USE SPECIFICATION TABLE) ............................ 7 . CAN SYSTEM (TYPE 2) .......................................... 53 .
ACQUISITION OF DATA BY CONSULT-II ........... 8 . Component Parts and Harness Connector Location 53 ... L
HOW TO USE CHECK SHEET TABLE ............... 9 . Schematic .............................................................. 53
.
CAN Diagnostic Support Monitor .......................... 16 . Wiring Diagram -- CAN -- .................................... 53 .
DESCRIPTION OF "CAN DIAG SUPPORT Check Sheet .......................................................... 54
. M
MNTR" SCREEN FOR ECM .............................. 16 . CHECK SHEET RESULTS (EXAMPLE) ............ 56 .
DESCRIPTION OF "CAN DIAG SUPPORT CAN SYSTEM (TYPE 3) .......................................... 68 .
MNTR" SCREEN FOR TCM .............................. 17 . Component Parts and Harness Connector Location 68 ...
DESCRIPTION OF "CAN DIAG SUPPORT Schematic .............................................................. 68
.
MNTR" SCREEN FOR ABS ACTUATOR AND Wiring Diagram -- CAN -- .................................... 68 .
ELECTRIC UNIT (CONTROL UNIT) .................. 18 . Check Sheet .......................................................... 69
.
DESCRIPTION OF "CAN DIAG SUPPORT CHECK SHEET RESULTS (EXAMPLE) ............ 71 .
MNTR" SCREEN FOR FRONT AIR CONTROL 19 ... CAN SYSTEM (TYPE 4) .......................................... 83 .
DESCRIPTION OF "CAN DIAG SUPPORT Component Parts and Harness Connector Location 83 ...
MNTR" SCREEN FOR BCM .............................. 20 . Schematic .............................................................. 83
.
DESCRIPTION OF "CAN DIAG SUPPORT Wiring Diagram -- CAN -- .................................... 83 .
MNTR" SCREEN FOR DRIVER SEAT CON- Check Sheet .......................................................... 84
.
TROL UNIT ........................................................ 20 . CHECK SHEET RESULTS (EXAMPLE) ............ 86 .
DESCRIPTION OF "CAN DIAG SUPPORT CAN SYSTEM (TYPE 5) .......................................... 99 .
MNTR" SCREEN FOR IPDM E/R ...................... 21 . Component Parts and Harness Connector Location 99 ...
DESCRIPTION OF "CAN DIAG MNTR" SCREEN Schematic .............................................................. 99
.

Revision: July 2006 LAN-1 2006 Quest
Wiring Diagram -- CAN -- .................................... 99 . Display Unit Circuit Inspection ............................. 120
.
Check Sheet ........................................................ 100 . Display Control Unit Circuit Inspection ................. 120 .
CHECK SHEET RESULTS (EXAMPLE) .......... 102 . Data Link Connector Circuit Inspection ................ 121 .
TROUBLE DIAGNOSIS FOR SYSTEM ................. 116 . BCM Circuit Inspection ........................................ 121
.
Inspection Between TCM and Data Link Connector Combination Meter Circuit Inspection .................. 122 .
Circuit .................................................................. 116
. Steering Angle Sensor Circuit Inspection ............. 122 .
ECM Circuit Inspection ........................................ 117 . Driver Seat Control Unit Circuit Inspection .......... 123 .
TCM Circuit Inspection ........................................ 117 . IPDM E/R Circuit Inspection ................................ 124
.
ABS Actuator and Electric Unit (Control Unit) Circuit CAN Communication Circuit Inspection ............... 124 .
Inspection ............................................................ 118
. IPDM E/R Ignition Relay Circuit Inspection .......... 126 .
Front Air Control Circuit Inspection ...................... 119 .

Revision: July 2006 LAN-2 2006 Quest
PRECAUTIONS
[CAN]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" UKS002EC

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 C
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: D
q 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. E
q 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. F
q 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.
G
Precautions When Using CONSULT-II UKS002EE

When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
H
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.
I
CHECK POINTS FOR USING CONSULT-II
1. Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
q If YES, GO TO 2.
J
q If NO, GO TO 5.

2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis
results? LAN
q If YES, GO TO 3.

q If NO, GO TO 4.

3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection. L
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" . M

Precautions for CAN System UKS002ED

q Do not apply voltage of 7.0 V or higher to terminal to be measured.
q Maximum open terminal voltage of tester in use must be less than 7.0 V.
q Before checking harnesses, turn ignition switch OFF and disconnect the battery cable from the negative
terminal.

Revision: July 2006 LAN-3 2006 Quest
PRECAUTIONS
[CAN]
q Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33 in).

PKIA0306E

q Do not make a bypass connection to repaired area. (If the cir-
cuit is bypassed, characteristics of twisted wire will be lost.)

PKIA0307E

Revision: July 2006 LAN-4 2006 Quest
TROUBLE DIAGNOSES WORK FLOW
[CAN]
TROUBLE DIAGNOSES WORK FLOW PFP:00004
A
When Displaying CAN Communication System Errors UKS004L3

WHEN A MALFUNCTION IS DETECTED BY CAN COMMUNICATION SYSTEM
q CAN communication line is open. (CAN H, CAN L, or both) B
q CAN communication line is shorted. (Ground, between CAN lines, or other harnesses)
q The areas related to CAN communication of unit is malfunctioning.
WHEN A MALFUNCTION IS DETECTED EXCEPT CAN COMMUNICATION SYSTEM C
q 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). D
q Fuse blown out (removed): CAN communication of the unit may be stopped at such time.
q 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. E

LAN

Revision: July 2006 LAN-5 2006 Quest
TROUBLE DIAGNOSES WORK FLOW
[CAN]
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.

SKIB6795E

q Step 1: Refer to LAN-7, "SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)" .
q Step 2: Refer to LAN-8, "ACQUISITION OF DATA BY CONSULT-II" .
q Step 3: Refer to LAN-9, "HOW TO USE CHECK SHEET TABLE" .
q Step 4: Refer to LAN-10, "Example of Filling in Check Sheet When Initial Conditions Are Reproduced" .
q Step 5: Refer to LAN-116, "TROUBLE DIAGNOSIS FOR SYSTEM" .

Revision: July 2006 LAN-6 2006 Quest
TROUBLE DIAGNOSES WORK FLOW
[CAN]
Diagnosis Procedure UKS004L4

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

G
SKIB6796E

LAN

Revision: July 2006 LAN-7 2006 Quest
TROUBLE DIAGNOSES WORK FLOW
[CAN]
ACQUISITION OF DATA BY CONSULT-II
Attach the data acquired by CONSULT-II on the check sheet determined according to CAN system type.
Transfer the data from the display screen of the vehicle to the CAN diagnosis monitor check sheet.
q With monochrome display: Refer to AV-159, "CAN Communication Line Check (With Monochrome Dis-
play Unit)" .
q With color display: Refer to AV-160, "CAN Communication Line Check (With Color Display Unit)" .
q With navigation system: Refer to AV-219, "CAN Communication Line Check" .

SKIB6797E

Revision: July 2006 LAN-8 2006 Quest
TROUBLE DIAGNOSES WORK FLOW
[CAN]
HOW TO USE CHECK SHEET TABLE
A

SKIB6798E
F
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)
G
"

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