Infiniti G37 Coupe. Manual - part 833

LAN

LAN-5

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MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT ..................................................................

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Diagnosis Procedure .............................................

167

ECM BRANCH LINE CIRCUIT .........................

169

Diagnosis Procedure .............................................

169

A-BAG BRANCH LINE CIRCUIT  .....................

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Diagnosis Procedure .............................................

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AV BRANCH LINE CIRCUIT ............................

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Diagnosis Procedure .............................................

171

BCM BRANCH LINE CIRCUIT  ........................

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Diagnosis Procedure .............................................

172

PSB BRANCH LINE CIRCUIT  .........................

173

Diagnosis Procedure .............................................

173

TCM BRANCH LINE CIRCUIT  .........................

174

Diagnosis Procedure .............................................

174

AFS BRANCH LINE CIRCUIT  .........................

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Diagnosis Procedure .............................................

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DLC BRANCH LINE CIRCUIT  .........................

176

Diagnosis Procedure .............................................

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M&A BRANCH LINE CIRCUIT  ........................

177

Diagnosis Procedure .............................................

177

STRG BRANCH LINE CIRCUIT .......................

178

Diagnosis Procedure .............................................

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ADP BRANCH LINE CIRCUIT  .........................

179

Diagnosis Procedure .............................................

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ABS BRANCH LINE CIRCUIT  .........................

180

Diagnosis Procedure .............................................

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ICC BRANCH LINE CIRCUIT  ..........................

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Diagnosis Procedure .............................................

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IPDM-E BRANCH LINE CIRCUIT  ....................

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Diagnosis Procedure .............................................

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CAN COMMUNICATION CIRCUIT  ..................

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Diagnosis Procedure .............................................

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CAN SYSTEM (TYPE  8)

COMPONENT DIAGNOSIS  .......................

185

MAIN LINE BETWEEN BCM AND DLC CIR-
CUIT ..................................................................

185

Diagnosis Procedure .............................................

185

MAIN LINE BETWEEN DLC AND ADP CIR-
CUIT ................................................................

186

Diagnosis Procedure  .............................................

186

MAIN LINE BETWEEN ADP AND ABS CIR-
CUIT ................................................................

187

Diagnosis Procedure  .............................................

187

ECM BRANCH LINE CIRCUIT  .......................

189

Diagnosis Procedure  .............................................

189

A-BAG BRANCH LINE CIRCUIT ....................

190

Diagnosis Procedure  .............................................

190

AV BRANCH LINE CIRCUIT  ..........................

191

Diagnosis Procedure  .............................................

191

BCM BRANCH LINE CIRCUIT  .......................

192

Diagnosis Procedure  .............................................

192

PSB BRANCH LINE CIRCUIT  ........................

193

Diagnosis Procedure  .............................................

193

TCM BRANCH LINE CIRCUIT ........................

194

Diagnosis Procedure  .............................................

194

AFS BRANCH LINE CIRCUIT  ........................

195

Diagnosis Procedure  .............................................

195

DLC BRANCH LINE CIRCUIT  ........................

196

Diagnosis Procedure  .............................................

196

M&A BRANCH LINE CIRCUIT  .......................

197

Diagnosis Procedure  .............................................

197

STRG BRANCH LINE CIRCUIT  .....................

198

Diagnosis Procedure  .............................................

198

ADP BRANCH LINE CIRCUIT ........................

199

Diagnosis Procedure  .............................................

199

RAS BRANCH LINE CIRCUIT ........................

200

Diagnosis Procedure  .............................................

200

ABS BRANCH LINE CIRCUIT ........................

201

Diagnosis Procedure  .............................................

201

ICC BRANCH LINE CIRCUIT  .........................

202

Diagnosis Procedure  .............................................

202

IPDM-E BRANCH LINE CIRCUIT  ...................

203

Diagnosis Procedure  .............................................

203

CAN COMMUNICATION CIRCUIT  .................

204

Diagnosis Procedure  .............................................

204

LAN-6

< PRECAUTION >

[CAN FUNDAMENTAL]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precautions for Trouble Diagnosis

INFOID:0000000001665994

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. 

Precautions for Harness Repair

INFOID:0000000001665995

• 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

LAN

CAN COMMUNICATION SYSTEM

LAN-7

< FUNCTION DIAGNOSIS >

[CAN FUNDAMENTAL]

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FUNCTION DIAGNOSIS

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000001665996

• 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

INFOID:0000000001665997

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 

LAN-8, "CAN Communication Control Circuit"

.

LAN-8

< FUNCTION DIAGNOSIS >

[CAN FUNDAMENTAL]

CAN COMMUNICATION SYSTEM

CAN Communication Control Circuit

INFOID:0000000001665998

*: These are the only control units wired with both ends of CAN communication system.

SKIB8713E

Component

System description

CAN controller

It controls CAN communication signal transmission and reception, error detection, etc.

Transceiver IC

It converts digital signal into CAN communication signal, and CAN communication signal into digital 
signal.

Noise filter

It eliminates noise of CAN communication signal.

Termination circuit

*

(Resistance of approx. 120 

Ω

)

It produces potential difference.