Infiniti FX35 / FX45. Manual - part 756

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ELECTRICAL

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SECTION 

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CONTENTS

LAN SYSTEM

CAN FUNDAMENTAL

SERVICE INFORMATION  ............................

3

PRECAUTIONS ...................................................

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Precaution for Trouble Diagnosis ..............................

3

Precaution for Harness Repair ..................................

3

SYSTEM DESCRIPTION .....................................

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CAN Communication System ....................................

4

Diag on CAN  .............................................................

5

TROUBLE DIAGNOSIS  ......................................

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Condition of Error Detection ......................................

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Symptom When Error Occurs in CAN Communi-
cation System ............................................................

7

Self-Diagnosis .........................................................

10

CAN Diagnostic Support Monitor  ............................

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TROUBLE DIAGNOSES WORK FLOW  ............

13

Information Needed for Trouble Diagnosis  .............

13

How to Use CAN Communication Signal Chart  ......

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Trouble Diagnosis Flow Chart  .................................

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Trouble Diagnosis Procedure ..................................

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CAN

SERVICE INFORMATION  ...........................

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INDEX FOR DTC  ................................................

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DTC No. Index  ........................................................

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HOW TO USE THIS SECTION ...........................

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Caution ....................................................................

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Abbreviation List ......................................................

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PRECAUTIONS ..................................................

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Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................

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Precaution for Trouble Diagnosis ............................

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Precaution for Harness Repair ................................

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TROUBLE DIAGNOSIS  ....................................

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CAN Diagnostic Support Monitor .............................

39

CAN System Specification Chart .............................

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CAN Communication Signal Chart  ..........................

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Schematic ................................................................

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Wiring Diagram - CAN - ...........................................

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Interview Sheet ........................................................

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Data Sheet ...............................................................

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CAN System (Type 1) ..............................................

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CAN System (Type 2) ..............................................

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CAN System (Type 3) ..............................................

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CAN System (Type 4) ..............................................

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CAN System (Type 5) ..............................................

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CAN System (Type 6) ..............................................

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CAN System (Type 7) ..............................................

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CAN system (Type 8)  ..............................................

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Component Parts Location  ......................................

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Harness Layout  .......................................................

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Malfunction Area Chart ............................................

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Main Line Between TCM and Data Link Connector 

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Main Line Between Data Link Connector and Uni-
fied Meter and A/C Amp.  .........................................

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Main Line Between Unified Meter and A/C Amp. 
and ABS Actuator and Electric Unit (Control Unit) ....

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Main Line Between ABS Actuator and Electric Unit 
(Control Unit) and Driver Seat Control Unit .............

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ECM Branch Line Circuit  .........................................

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AWD Control Unit Branch Line Circuit .....................

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Display Control Unit Branch Line Circuit  .................

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ICC Unit Branch Line Circuit ....................................

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TCM Branch Line Circuit  .........................................

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BCM Branch Line Circuit  .........................................

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Data Link Connector Branch Line Circuit  ................

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Intelligent Key Unit Branch Line Circuit  ...................

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LDW Camera Unit Branch Line Circuit  ....................

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Steering Angle Sensor Branch Line Circuit  .............

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Unified Meter and A/C Amp. Branch Line Circuit ....

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ABS Actuator and Electric Unit (Control Unit) 
Branch Line Circuit  ..................................................

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ICC Sensor Branch Line Circuit ..............................

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Driver Seat Control Unit Branch Line Circuit  ..........

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IPDM E/R Branch Line Circuit .................................

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CAN Communication Circuit  ...................................

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PRECAUTIONS

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< SERVICE INFORMATION >

[CAN FUNDAMENTAL]

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SERVICE INFORMATION

PRECAUTIONS

Precaution for Trouble Diagnosis

INFOID:0000000001451944

CAUTION:

• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when

checking the harness. 

Precaution for Harness Repair

INFOID:0000000001451945

• Solder the repaired area and wrap tape around the soldered area.

NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost. 

• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-

tion line.

SKIB8766E

SKIB8767E

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< SERVICE INFORMATION >

[CAN FUNDAMENTAL]

SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

CAN Communication System

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• CAN communication is a multiplex communication system. This enables the system to transmit and receive

large quantities of data at high speed by connecting control units with two communication lines (CAN-H and
CAN-L).

• Control units on the CAN network transmit signals using the CAN communication control circuit. They

receive only necessary signals from other control units to operate various functions.

• CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.

SYSTEM DIAGRAM

Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.

SKIB8887E

Component

Description

Main line

CAN communication line between splices

Branch line

CAN communication line between splice and a control unit

Splice

A point connecting a branch line with a main line

Termination circuit

Refer to "CAN COMMUNICATION CONTROL CIRCUIT".