Nissan Pathfinder (2009 year). Manual - part 47

AV-188

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U1255 SATELLITE RADIO TUNER

U1255 SATELLITE RADIO TUNER

Description

INFOID:0000000003939075

DTC Logic

INFOID:0000000003939076

Diagnosis Procedure

INFOID:0000000003939077

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

Check satellite radio tuner power supply and ground circuit. Refer to 

AV-196, "SATELLITE RADIO TUNER :

Diagnosis Procedure"

.

Is inspection result OK?

YES

>> Inspection End.

NO

>> Repair malfunctioning parts.

Part name

Description

SATELLITE RADIO TUNER

• Inputs the satellite radio signal from satellite radio antenna and outputs it to 

the AV control unit.

• It is controlled with the communication (communication signal, request sig-

nal) from AV control unit.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1255

SAT CONN
[U1255]

The satellite radio tuner power supply and ground circuit 
malfunction is detected

Satellite radio tuner power supply and 
ground circuit

2009 Pathfinder

AV

U1256 HAND FREE CONN

AV-189

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U1256 HAND FREE CONN

Description

INFOID:0000000003939078

U1256 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

U1256

• HAND FREE CONN

[U1256]

• Bluetooth control unit  power supply and ground circuit 

malfunction is detected

• A malfunction is detected in communication circuit be-

tween AV control unit and Bluetooth control unit

• A malfunction is detected in communication signal be-

tween AV control unit and Bluetooth control unit

• Bluetooth control unit power supply 

and ground circuits

• Communication circuit between AV 

control unit and Bluetooth control 
unit

2009 Pathfinder

AV-190

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U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000003939079

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

2009 Pathfinder

AV

U1310 AV CONTROL UNIT

AV-191

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U1310 AV CONTROL UNIT

Description

INFOID:0000000003939080

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

AV-287, "Removal and Installation"

.

DTC Logic

INFOID:0000000003939081

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-

287, "Removal and Installation"

2009 Pathfinder

AV-192

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POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT

AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000003939082

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

AWNIA0456ZZ

2009 Pathfinder

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-193

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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:0000000003939083

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

Connector

Terminal

Ignition switch 

position

Value (Approx.)

M93

2

ACC

9V

3

ALNIA0317GB

2009 Pathfinder

AV-194

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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-192, "AV CONTROL UNIT : Diagno-

sis 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:0000000003939084

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

2009 Pathfinder

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-195

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1.

Disconnect A/C and AV switch assembly connector M99. 

2.

Check voltage between the A/C and AV switch assembly con-
nector M99 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 M99 and ground.

Does continuity exist?

YES

>> Inspection End.

NO

>> Repair harness or ground.

BOSE SPEAKER AMP

BOSE SPEAKER AMP : Diagnosis Procedure

INFOID:0000000003939085

1.

CHECK FUSE

Check that the BOSE speaker amp. fuse is 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

1.

Turn ignition switch OFF.

2.

Disconnect BOSE speaker amp. connector.

3.

Check voltage between BOSE speaker amp. harness connector
B74 terminal 1 and ground.

Is battery voltage present?

YES

>> GO TO 3

NO

>> Check harness between BOSE speaker amp. and fuse.

3.

CHECK GROUND CIRCUIT

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M99

2

Ground

0V

Battery 
voltage

Battery 
voltage

ALNIA0315GB

Connector

Terminal

—

Continuity

M99

1

Ground

Yes

ALNIA0316GB

Unit

Terminal

Signal name

Fuse No.

BOSE speaker amp.

1

Battery power

29

(+)

(-)

Voltage (approx.)

Connector

Terminal

B74

1

Ground

Battery voltage

ALNIA0527GB

2009 Pathfinder