Infiniti G35 (V35) Sedan. Manual — part 95

AV-152

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U1000 CAN COMM CIRCUIT

COMPONENT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000000964639

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each
control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to

LAN-28, "CAN Communication Signal Chart"

.

DTC Logic

INFOID:0000000000964640

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000000964641

1.

PERFORM SELF DIAGNOSTIC

1.

Turn ignition switch ON and wait for 2 second or more.

2.

Check “Self Diagnostic Result” of “MULTI AV”.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to “LAN system”. Refer to

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to GI section. Refer to

GI-39, "Intermittent Incident"

.

DTC

Display contents of CON-

SULT-III

Diagnostic item is detected when ...

Probable malfunction location

U1000

CAN COMM CIRCUIT

When AV control unit is not transmitting or re-
ceiving CAN communication signal for 2 sec-
onds or more.

CAN communication system

AV

U1010 CONTROL UNIT (CAN)

AV-153

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C

D

E

F

G

H

I

J

K

L

M

B

N

A

O

P

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000000964642

Initial diagnosis of AV control unit.

DTC Logic

INFOID:0000000000964643

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000000964644

1.

REPLACE AV CONTROL UNIT

When DTC U1010 is detected, replace AV control unit.

>> INSPECTION END

DTC

Display contents of CON-

SULT-III

Diagnostic item is detected when ...

Probable malfunction location

U1010

CONTROL UNIT (CAN)

CAN initial diagnosis malfunction is detected

AV control unit

AV-154

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U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

Description

INFOID:0000000000964645

Replace the AV control unit if this DTC is displayed. Refer to

AV-292, "Exploded View"

.

DTC Logic

INFOID:0000000000964646

Part name

Description

AV CONTORL UNIT

• It is the master unit of the MULTI AV system, and it is connected to each control

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and unified meter and A/C amp via CAN communica-

tion to obtain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and

parking brake).

DTC

Display contents of

CONSULT-III

DTC Detection Condition

Action to take

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication
circuit.

Replace AV control unit

AV

U1200 AV CONTROL UNIT

AV-155

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C

D

E

F

G

H

I

J

K

L

M

B

N

A

O

P

U1200 AV CONTROL UNIT

Description

INFOID:0000000000964647

Replace the AV control unit if this DTC is displayed. Refer to

AV-292, "Exploded View"

.

DTC Logic

INFOID:0000000000964648

Part name

Description

AV CONTORL UNIT

• It is the master unit of the MULTI AV system, and it is connected to each control

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and unified meter and A/C amp via CAN communica-

tion to obtain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and

parking brake).

DTC

Display contents of

CONSULT-III

DTC Detection Condition

Action to take

U1200

Cont Unit
FLASH- ROM
[U1200]

An internal malfunction is detected in AV control unit
(FLASH-ROM).

Replace AV control unit