Nissan Murano. Manual - part 116

AV-242

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U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000009721749

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

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
U1256

• AV COMM CIRCUIT 

[U1300]

• HAND FREE CONN 

[U1256]

When either one of the following items are 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 between 

AV control unit and TEL adapter unit.

U1300
U1240
U1256

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• HAND FREE CONN 

[U1256]

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

AV communication circuits between AV 
control unit and multifunction switch.

AV

U1310 AV CONTROL UNIT

AV-243

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U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009721750

DTC

Display contents of 

CONSULT

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.
Refer to 

AV-276, "Exploded View"

.

AV-244

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POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT

AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000009721751

1.

CHECK FUSE

Check for blown fuses.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Be sure to eliminate cause of malfunction before installing new fuse.

2.

CHECK POWER SUPPLY CIRCUIT

Check voltage between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness between AV control unit and fuse.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connectors.

3.

Check continuity between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

DISPLAY UNIT

DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000009721752

1.

CHECK POWER SUPPLY CIRCUIT (DISPLAY SIDE)

Check voltage between display unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT (CONTINUITY)

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector and display unit connector.

3.

Check continuity between AV control unit harness connector and display unit harness connector. 

Power source

Fuse No.

Battery

35

Ignition switch ACC or ON

19

Signal name

Connector No.

Terminal No.

Ignition switch position

Value (Approx.)

Battery power supply

M171

19

OFF

Battery voltage

ACC power supply

7

ACC

Battery voltage

Signal name

Connector No.

Terminal No.

Ignition switch position

Continuity 

Ground

M171

20

OFF

Existed

Signal name

Connector No.

Terminal No.

Ignition switch position

Value (Approx.)

Inverter VCC

M194

2

ACC

9.0 V

Signal VCC

3

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-245

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4.

Check continuity between display unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK POWER SUPPLY CIRCUIT (AV CONTROL UNIT SIDE)

1.

Connect the AV control unit harness connector.

2.

Turn ignition switch ACC.

3.

Check voltage between AV control unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit. Refer to 

AV-276, "Exploded View"

.

4.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect display unit connector.

3.

Check continuity between display unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

BOSE AMP.

BOSE AMP. : Diagnosis Procedure

INFOID:0000000009721753

1.

CHECK FUSE

Check for blown fuses.

Is the inspection result normal?

AV control unit

Display unit

Continuity

Connector

Terminal

Connector

Terminal

M172

48

M194

2

Existed

36

3

Existed

Display unit

Ground

Continuity

Connector

Terminal

M194

2

Not existed

3

Not existed

(+)

(

−

)

Ignition switch 

position

Voltage (Ap-

prox.)

AV control unit

Connector

Terminal

M172

48

Ground

ACC

9.0 V

36

9.0 V

Signal name

Connector No.

Terminal No.

Ignition switch position

Continuity 

Ground

M194

1

OFF

Existed

Power source

Fuse No.

Battery

23

24

25