Nissan Pathfinder (2008 year). Manual - part 28

AV-64

< COMPONENT DIAGNOSIS >

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U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000001450795

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]

• A/C and AV switch assembly  power supply and ground 

circuit malfunction is detected

• A malfunction is detected in communication circuit be-

tween AV control unit and A/C and AV switch assembly

• A malfunction is detected in communication signal be-

tween AV control unit and A/C and AV switch assembly

• A/C and AV switch assembly power 

supply and ground circuits

• Communication circuit between AV 

control unit and A/C and AV  switch 
assembly

AV

U1310 AV CONTROL UNIT

AV-65

< COMPONENT DIAGNOSIS >

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U1310 AV CONTROL UNIT

Description

INFOID:0000000001450783

Replace the AV control unit if this DTC is displayed. Refer to 

AV-134, "Removal and Installation"

.

DTC Logic

INFOID:0000000001450784

Part name

Description

AV CONTROL UNIT

• It is the master unit of the MULTI AV system  and it is connected to each control 

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and combination meter via CAN communication to ob-

tain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and 

parking brake). 

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Action to take

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication 
circuit.

Replace AV control unit. Refer to 

AV-

134, "Removal and Installation"

.

AV-66

< COMPONENT DIAGNOSIS >

[MID AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT

AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000001450796

1.

CHECK FUSES

Check that the following fuses of the AV control unit are not are not blown.

Are the fuses OK?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

POWER SUPPLY CIRCUIT CHECK

1.

Disconnect AV control unit connectors M42 and M70. 

2.

Check voltage between the AV control unit connectors M42 and
M70 and ground.

Are the voltage results as specified?

YES

>> GO TO 3

NO

>> • Check connector housings for disconnected or loose

terminals.

• Repair harness or connector.

3.

GROUND CIRCUIT CHECK

Unit

Terminals

Signal name

Fuse No.

AV control unit

19

Battery power

29

7

Ignition switch ACC or ON

4

104

Ignition switch ON or START

12

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M42

7

Ground

0V

Battery 
voltage

Battery 
voltage

19

Ground

Battery 
voltage

Battery 
voltage

Battery 
voltage

M70

104

Ground

0V

0V

Battery 
voltage

ALNIA0875GB

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-67

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1.

Turn ignition switch OFF.

2.

Check continuity between AV control unit harness connectors
M42, M45 and M70 and ground.

Are the continuity results as specified?

YES

>> Inspection End.

NO

>> Repair AV control unit ground.

DISPLAY UNIT

DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000001450797

1.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch to ACC.

2.

Check voltage between display unit harness connector M93 and
ground.

Does specified voltage exist?

YES

>> GO TO 3

NO

>> GO TO 2

2.

CHECK POWER SUPPLY CIRCUIT

(+)

(-)

Continuity

Connector

Terminal

M42

20

Ground

Yes

M45

54

M70

85

ALNIA0314GB

Signal name

Connector 

No.

Terminal 

No.

Ignition switch 

position

Value (Approx.)

Inverter VCC

M93

2

ACC

9V

Signal VCC

3

ALNIA0317GB

AV-68

< COMPONENT DIAGNOSIS >

[MID AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the display unit connector M93 and the AV control
unit connector M45.

3.

Check continuity between the display unit harness connector
M93 (A) and the AV control unit connector M45 (B).

4.

Check continuity between the display unit harness connector M93 (A) and ground.

Are continuity results as specified?

YES

>> Check AV control unit power and ground supply. Refer to 

AV-66, "AV CONTROL UNIT : Diagnosis

Procedure"

.

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect display unit connector.

3.

Check continuity between display unit harness connector and
ground.

Does continuity exist?

YES

>> INSPECTION END.

NO

>> Repair harness or connector.

A/C AND AV SWITCH ASSEMBLY

A/C AND AV SWITCH ASSEMBLY : Diagnosis Procedure

INFOID:0000000001450798

1.

CHECK FUSE

Check that the fuse of the AC and AV switch assembly is not blown.

Is the fuse OK?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

POWER SUPPLY CIRCUIT CHECK

A

B

Continuity

Connector

Terminal

Connector

Terminal

M93

2

M45

59

Yes

3

47

A

—

Continuity

Connector

Terminal

M93

2

Ground

No

3

ALNIA0318GB

Connector

Terminal

—

Continuity

M93

1

Ground

Yes

ALNIA0319GB

Unit

Terminal

Signal name

Fuse No.

A/C and AV switch assembly

2

Ignition switch ACC or ON

4

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-69

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1.

Disconnect A/C and AV switch assembly connector M98. 

2.

Check voltage between the A/C and AV switch assembly con-
nector M98 and ground.

Are the voltage results as specified?

YES

>> GO TO 3

NO

>> • Check connector housings for disconnected or loose

terminals.

• Repair harness or connector.

3.

GROUND CIRCUIT CHECK

1.

Turn ignition switch OFF.

2.

Check continuity between A/C and AV switch assembly harness
connector M98 and ground.

Are the continuity results as specified?

YES

>> Inspection End.

NO

>> Repair harness or ground.

SATELLITE RADIO TUNER

SATELLITE RADIO TUNER : Diagnosis Procedure

INFOID:0000000001450799

1.

CHECK FUSES

Check that the following fuses of the satellite radio tuner (factory installed) are not blown.

Are the fuses OK?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

POWER SUPPLY CIRCUIT CHECK

1.

Turn ignition switch OFF.

2.

Disconnect satellite radio tuner (factory installed) connector M41. 

3.

Check voltage between the satellite radio tuner (factory installed) and ground.

Are the voltage readings as specified?

YES

>> GO TO 3

NO

>> • Check connector housings for disconnected or loose

terminals.

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M98

2

Ground

0V

Battery 
voltage

Battery 
voltage

ALNIA0315GB

Connector

Terminal

—

Continuity

M98

1

Ground

Yes

ALNIA0316GB

Unit

Terminals

Signal name

Fuse No.

Satellite radio tuner (factory in-
stalled)

32

Battery power

17

36

Ignition switch ACC or ON

4

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M41

32

Ground

Battery 
voltage

Battery 
voltage

Battery 
voltage

36

0V

Battery 
voltage

Battery 
voltage

WKIA4539E

AV-70

< COMPONENT DIAGNOSIS >

[MID AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

• Repair harness or connector.

3.

GROUND CIRCUIT CHECK

Inspect satellite radio tuner (factory installed) case ground.

Does case ground pass inspection?

YES

>> Inspection End.

NO

>> Repair satellite radio tuner (factory installed) case ground.

REAR VIEW CAMERA CONTROL UNIT

REAR VIEW CAMERA CONTROL UNIT : Diagnosis Procedure

INFOID:0000000001451511

1.

CHECK FUSE

Check that the following fuses of the rear view camera control unit are not blown.

Are the fuses OK?

YES

>> GO TO 2

NO

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

2.

CHECK POWER SUPPLY CIRCUIT

Check voltage between rear view camera control unit harness con-
nector B176 and ground.

Are the voltage readings as specified?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear view camera control unit connector.

3.

Check continuity between rear view camera control unit harness
connector B176 terminal 3 and ground.

Does continuity exist?

YES

>> Inspection End.

NO

>> Repair harness or connector.

REAR VIEW CAMERA

REAR VIEW CAMERA : Diagnosis Procedure

INFOID:0000000001451512

1.

CHECK POWER SUPPLY CIRCUIT (REAR VIEW CAMERA SIDE)

1.

Turn ignition switch ON.

2.

Shift transmission into reverse.

Unit

Terminals

Signal name

Fuse No.

Rear view camera control unit

1

Battery power

29

2

Ignition switch ACC or ON

4

Signal name

Connector 

No.

Terminal 

No.

Ignition switch 

position

Value (Approx.)

Battery power supply

B176

1

OFF

Battery voltage

ACC power supply

2

ACC

ALLIA0244ZZ

Connector Terminal 

— 

Continuity 

B176

3 Ground 

Yes 

ALLIA0245ZZ

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-71

< COMPONENT DIAGNOSIS >

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3.

Check voltage between rear view camera harness connector
D551 and ground.

Is voltage reading approximately 6 volts?

YES

>> GO TO 4

NO

>> GO TO 2

2.

CHECK POWER SUPPLY CIRCUIT (CONTINUITY)

1.

Turn ignition switch OFF.

2.

Disconnect rear view camera and rear view camera control unit connectors.

3.

Check continuity between rear view camera harness connector
D551 (A) terminal 1 and rear view camera control unit harness
connector B176 (B) terminal 8. 

4.

Check continuity between rear view camera harness connector
D551 (A) terminal 1 and ground. 

Are continuity test results as specified?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK POWER SUPPLY CIRCUIT (REAR VIEW CAMERA CONTROL UNIT SIDE)

1.

Connect rear view camera control unit harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between rear view camera control unit harness
connector B176 and ground.

Is voltage reading approximately 6 volts?

YES

>> Inspection End.

NO

>> Replace rear view camera control unit. Refer to 

AV-147,

"Removal and Installation"

.

4.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear view camera harness connector.

Signal name

Connector 

No.

Terminal 

No.

Transmission 

position

Value (Approx.)

Camera ON signal

D551

1

Reverse

6V

ALLIA0243ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

D551

1

B176

8

Yes

A

—

Continuity

Connector

Terminal

D551

1

Ground

No

ALLIA0246ZZ

Signal name

Connector 

No.

Terminal 

No.

Transmission 

position

Value (Approx.)

Camera ON signal

B176

8

Reverse

6V

ALLIA0247ZZ