Infiniti FX35, FX50 (S51). Manual - part 127

AV

U1300 AV COMM CIRCUIT

AV-281

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000005475947

U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U1300
U1240

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

When either one of the following items are detected:
• multifunction switch power supply and ground circuits 

are malfunctioning.

• AV communication circuits between AV control unit 

and multifunction switch are malfunctioning.

• Multifunction switch power supply 

and ground circuits.

• AV communication circuits between 

AV control unit and multifunction 
switch.

U1300

U125B

• AV COMM CIRCUIT 

[U1300]

• AROUND CAMERA 

CONN [U125B]

When either one of the following items are detected:
• around view monitor control unit power supply and 

ground circuits are malfunctioning.

• AV communication circuits between AV control unit 

and around view monitor control unit are malfunction-
ing.

• Around view monitor control unit 

power supply and ground circuits.

• AV communication circuits between 

AV control unit and around view 
monitor control unit.

U1300

U125C

• AV COMM CIRCUIT 

[U1300]

• SONAR CONN 

[U125C]

When either one of the following items are detected:
• sonar control unit power supply and ground circuits are 

malfunctioning.

• AV communication circuits between AV control unit 

and sonar control unit are malfunctioning.

• Sonar control unit power supply and 

ground circuits.

• AV communication circuits between 

AV control unit and sonar control 
unit.

U1300
U1240

U125B

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• AROUND CAMERA 

CONN [U125B]

AV communication circuits between AV control unit and 
multifunction switch are malfunctioning.

AV communication circuits between AV 
control unit and multifunction switch.

AV-282

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000005475761

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication 
circuit.

Replace the AV control unit if the mal-
function occurs constantly.

AV

B2700 CORNER SENSOR [FL]

AV-283

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

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B2700 CORNER SENSOR [FL]

DTC Logic

INFOID:0000000005475763

DTC DETECTION LOGIC

DTC No.

CONSULT-III indication

DTC detection condition

Troubleshooting

B2700

CORNER SENSOR [FL]
[B2700]

Corner sensor (FL) is malfunctioning.

Replace corner sensor (FL).

AV-284

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

B2701 SENSOR HARNESS OPEN [CR-FL]

B2701 SENSOR  HARNESS OPEN [CR-FL]

DTC Logic

INFOID:0000000005475765

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005475766

1.

CHECK HARNESS CORNER SENSOR (FL) SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect sonar control unit connector and corner sensor (FL) connector.

3.

Check continuity between sonar control unit harness connector and corner sensor (FL) harness connec-
tor.

4.

Check continuity between sonar control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK HARNESS CORNER SENSOR (FL) GROUND CIRCUIT

Check continuity between sonar control unit harness connector and corner sensor (FL) harness connector.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

DTC No.

CONSULT-III indication

DTC detection condition

Troubleshooting

B2701

SENSOR HARNESS 
OPEN [CR-FL] [B2701]

Corner sensor (FL) harness circuit is open.

Check corner sensor (FL) circuit.

Sonar control unit

Corner sensor (FL)

Continuity

Connector

Terminal

Connector

Terminal

M47

3

E154

1

Existed

Sonar control unit

Ground

Continuity

Connector

Terminal

M47

3

Not existed

Sonar control unit

Corner sensor (FL)

Continuity

Connector

Terminal

Connector

Terminal

M47

12

E154

2

Existed