Nissan Pathfinder. Manual - part 119

AV

U1300 AV COMM CIRCUIT

AV-303

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITH BOSE]

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000009174583

U1300 is indicated when a malfunction occurs in the communication signal of the multi AV system. Indicated

simultaneously, without fail, the malfunction of control units connected to the AV control unit through communi-

cation circuits. Determine the possible malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

CONSULT Display

DTC Detection Condition

Possible Cause

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

When any of the following is detected:
• A/C and AV switch assembly power supply or 

ground circuit malfunction.

• AV communication circuit malfunction between 

AV control unit and A/C and AV switch assem-
bly.

• A/C and AV switch assembly power supply and 

ground circuits.

• AV communication circuits between AV control 

unit and A/C and AV switch assembly.

• AV COMM CIRCUIT

[U1300]

• HAND FREE CONN

[U1256]

When any of the following is detected:
• Bluetooth

®

 control unit power supply or ground 

circuit malfunction.

• AV communication circuit malfunction between 

AV control unit and Bluetooth

®

 control unit.

• Bluetooth

®

 control unit power supply and ground 

circuits.

• AV communication circuits between AV control 

unit and Bluetooth

®

 control unit.

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

• HAND FREE CONN

[U1256]

AV communication circuit malfunction between AV 
control unit and A/C and AV switch assembly.

AV communication circuits between AV control unit 
and A/C and AV switch assembly.

AV-304

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITH BOSE]

U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009174584

CONSULT Display

DTC Detection Condition

Possible Cause

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV com-
munication circuit.

Replace the AV control unit if the malfunction occurs 
constantly.
Refer to 

AV-365, "Removal and Installation"

.

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-305

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITH BOSE]

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POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000009174585

Regarding Wiring Diagram information, refer to 

AV-242, "Wiring Diagram"

.

1.

CHECK FUSE

Check that the following fuses are not blown.

Are the fuses blown?

YES

>> Replace the blown fuse after repairing the affected circuit.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect AV control unit connectors M42 and M44.

3. Check voltage between AV control unit connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between AV control unit connector M44 terminal 52 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace harness or connectors.

DISPLAY UNIT
DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000009174586

Regarding Wiring Diagram information, refer to 

AV-242, "Wiring Diagram"

.

1.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT 1

Terminal No.

Signal name

Fuse No.

29

Ignition signal

29 (5A)

39

ACC power supply

65 (10A)

51

Battery power supply

15 (15A)

AV control unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M42

29

—

Ignition switch: ON

Battery voltage

M44

39

Ignition switch: ACC

51

Ignition switch: OFF

AV control unit

Ground

Continuity 

Connector

Terminal

M44

52

—

Yes

AV-306

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITH BOSE]

POWER SUPPLY AND GROUND CIRCUIT

Check voltage between display unit harness connector M93 terminals 2, 3 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M45 and display unit connector.

3. Check continuity between AV control unit connector M45 terminals 64, 76 and display unit connector M93

terminals 3, 2. 

4. Check continuity between AV control unit connector M45 terminals 64, 76 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT 2

1. Connect the AV control unit connector M45.

2. Check voltage between AV control unit connector M45 terminals 64, 76 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace AV control unit. Refer to 

AV-365, "Removal and Installation"

.

4.

CHECK INVERTER GROUND AND SIGNAL GROUND CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M45 and display unit connector.

3. Check continuity between AV control unit connector M45 terminals 63, 75 and display unit connector M93

terminals 14, 13. 

Display unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M93

2

—

Ignition switch: ACC

9.0 V

3

AV control unit

Display unit

Continuity

Connector

Terminal

Connector

Terminal

M45

64

M93

3

Yes

76

2

AV control unit

Ground

Continuity

Connector

Terminal

M45

64

—

No

76

AV control unit

Ground

Condition

Voltage

(Approx.)

(+)

(

−)

Connector

Terminal

M45

64

—

Ignition switch: ACC

9.0 V

76