Infiniti FX35, FX50 (S51). Manual - part 181

AV

U1247 REAR DISPLAY UNIT

AV-497

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace rear display unit.

4.

CHECK SERIAL COMMUNICATION SIGNAL

Check signal between rear display unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace video distributor.

(+)

(

−

)

Condition

Reference value

Rear display unit

Connector

Terminal

B26

9

Ground

Ignition 

switch 

ON

Rear seat re-
mote controller 
operation when 
AUX or DVD im-
age is displayed 
on rear dis-
played.

PKIB5039J

(+)

(

−

)

Condition

Reference value

Rear display unit

Connector

Terminal

B26

10

Ground

Ignition 

switch 

ON

Rear seat re-
mote controller 
operation when 
AUX or DVD im-
age is displayed 
on rear dis-
played.

PKIB5039J

AV-498

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1258 SATELLITE RADIO ANTENNA

U1258 SATELLITE RADIO ANTENNA

DTC Logic

INFOID:0000000005247265

Diagnosis Procedure

INFOID:0000000005247266

1.

SATELLITE RADIO ANTENNA CHECK

Visually check satellite radio antenna and antenna feeder.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK AV CONTROL UNIT VOLTAGE 

1.

Disconnect satellite radio antenna connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit terminal and ground.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1258

XM ANTENNA CONN
[U1258]

Satellite radio antenna connection malfunction is detect-
ed.

Satellite radio antenna disconnection

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Terminal

159

Ground

4.0 V

AV

U1263 USB

AV-499

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

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U1263 USB

DTC Logic

INFOID:0000000005474840

Diagnosis Procedure

INFOID:0000000005474841

1.

CHECK USB HARNESS

Visually check USB harness.

Is the inspection result normal?

YES

>> Replace AV control unit. Refer to 

AV-578, "Exploded View"

.

NO

>> Replace USB harness.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U1263

USB OVERCURRENT
[U1263]

Detection of overcurrent in USB connector.

Check USB harness between the AV 
control unit and USB connector.

AV-500

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000005511843

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]

around view monitor control unit power supply and 
ground circuits are malfunctioning.

Around view monitor control unit power 
supply and ground circuits.

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
U1246
U1247

• AV COMM CIRCUIT 

[U1300]

• VIDEO DIST CONN 

[U1246]

• REAR DISP CONN 

[U1247]

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

malfunctioning.

• AV communication circuits between around view mon-

itor control unit and video distributor are malfunction-
ing.

• Video distributor power supply and 

ground circuits.

• AV communication circuits between 

around view monitor control unit and 
video distributor.

U1300
U1246
U1247

U125B

• AV COMM CIRVUIT 

[U1300]

• VIDEO DIST CONN 

[U1246]

• REAR DISP CONN 

[1247]

• AROUND CAMERA 

CONN [U125B]

AV communication circuits between AV control unit and 
around view monitor control unit are malfunctioning.

AV communication circuits between AV 
control unit and around view monitor 
control unit.

U1300
U1240
U1246
U1247

U125B

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• VIDEO DIST CONN 

[U1246]

• REAR DISP CONN 

[U1247]

• 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.