Infiniti FX35, FX50 (S51). Manual - part 81

AV

U1255 SATELLITE RADIO TUNER

AV-97

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit.

4.

CHECK SATELLITE RADIO TUNER

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector.

3.

Connect satellite radio tuner.

4.

Turn ignition switch ON.

5.

Check voltage between satellite radio tuner harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace satellite radio tuner.

M206

129

Ground

7.5 V

130

7.0 V

(+)

(

−

)

Voltage

(Approx.)

Satellite radio tuner

Connector

Terminal

B236

10

Ground

7.0 V

AV-98

< DTC/CIRCUIT DIAGNOSIS >

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U1263 USB

U1263 USB

DTC Logic

INFOID:0000000005528951

Diagnosis Procedure

INFOID:0000000005528952

1.

CHECK USB HARNESS

Visually check USB harness.

Is the inspection result normal?

YES

>> Replace AV control unit. Refer to 

AV-136, "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

U1300 AV COMM CIRCUIT

AV-99

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000005246803

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 causes

U1300
U1240

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

When either one of the following items is 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 be-

tween AV control unit and multi-
function switch.

U1300
U1256

• AV COMM CIRCUIT

[U1300]

• HAND FREE CONN

[U1256]

When either one of the following items is detected:

• TEL adapter unit power supply and ground circuits are 

malfunctioning.

• AV communication circuits between AV control unit and 

TEL adapter unit are malfunctioning.

• TEL adapter unit power supply and 

ground circuits.

• AV communication circuits be-

tween AV control unit and TEL 
adapter unit.

U1300
U1240
U1256

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

• HAND FREE CONN

[U1256]

Malfunction is detected in AV communication circuits be-
tween AV control unit and multifunction switch.

AV communication circuits between 
AV control unit and multifunction 
switch.

AV-100

< DTC/CIRCUIT DIAGNOSIS >

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U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000005528961

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.