Nissan Pathfinder (2009 year). Manual - part 25

AV-12

< FUNCTION DIAGNOSIS >

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AUDIO SYSTEM

FUNCTION DIAGNOSIS

AUDIO SYSTEM

System Diagram

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System Description

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AUDIO SYSTEM

The audio system consists of the following components
• Audio unit
• Window antenna (audio)
• Front door speakers
• Front tweeters
• Rear door speakers
When the audio system is on, radio signals are received by the window antenna. The audio unit then sends
audio signals to the front door speakers, front tweeters and rear speakers.
Refer to Owner's Manual for audio system operating instructions.

Component Parts Location

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AWNIA0625GB

ALNIA0554GB

2009 Pathfinder

A V

AUDIO SYSTEM

AV-13

< FUNCTION DIAGNOSIS >

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Component Description

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1.

Front tweeter LH M109

2.

Audio unit M38

3.

Front tweeter RH M111

4.

Front door speaker
LH D12
RH D112

5.

Rear door speaker 
LH D209
RH D309

Part name

Description

Audio unit

Controls audio system functions

Front door speakers

• Outputs audio signal from audio unit
• Outputs high, mid and low range sounds

Front tweeters

• Outputs audio signal from audio unit
• Outputs high range sounds

Rear door speakers

• Outputs audio signal from audio unit
• Outputs high, mid and low range sounds

2009 Pathfinder

AV-14

< COMPONENT DIAGNOSIS >

[BASE AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

COMPONENT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

AUDIO UNIT

AUDIO UNIT : Diagnosis Procedure

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1.

CHECK FUSES

Check that the following fuses 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 audio unit connector M38. 

2.

Check voltage between the audio unit connector M38 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

Inspect audio unit case ground.

Does case ground pass inspection?

YES

>> Inspection End.

NO

>> Repair audio unit case ground.

Unit

Terminals

Signal name

Fuse No.

Audio unit

19

Battery power

29

7

Ignition switch ACC or ON

4

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M38

19

Ground

Battery 
voltage

Battery 
voltage

Battery 
voltage

7

Ground

0V

Battery 
voltage

Battery 
voltage

WKIA5769E

2009 Pathfinder

AV

FRONT DOOR SPEAKER

AV-15

< COMPONENT DIAGNOSIS >

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FRONT DOOR SPEAKER

Description

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The audio unit sends audio signals to the front door speakers using the front door speaker circuits.

Diagnosis Procedure

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1.

HARNESS CHECK

1.

Disconnect audio unit connector M38 (A) and suspect speaker
connector (B).

2.

Check continuity between audio unit harness connector M38 (A)
terminal and suspect speaker harness connector (B) terminal.

3.

Check continuity between audio unit harness connector M38 (A)
terminal and ground.

Are continuity results as specified?

YES

>> GO TO 2

NO

>> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

2.

FRONT SPEAKER SIGNAL CHECK

A B

Continuity

Connector

Terminal

Connector

Terminal

M38

2

D12

1

Yes

3

2

11

D112

1

12

2

A 

—

Continuity

Connector

Terminal

M38

2

Ground

No

3

11

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AWNIA0031ZZ

2009 Pathfinder

AV-16

< COMPONENT DIAGNOSIS >

[BASE AUDIO]

FRONT DOOR SPEAKER

1.

Connect audio unit connector and front speaker connector.

2.

Turn ignition switch to ACC.

3.

Push “POWER” switch.

4.

Check the signal between audio unit harness connector termi-
nals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified?

YES

>> Replace speaker. Refer to 

AV-37, "Removal and Instal-

lation"

.

NO

>> Replace audio unit. Refer to 

AV-34, "Removal and

Installation"

.

Connector

Terminal

Condition

Reference

signal

(+)

(-)

M38

2

3

Receive audio 
signal

11

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AWNIA0032ZZ

SKIA0177E

2009 Pathfinder

AV

FRONT TWEETER

AV-17

< COMPONENT DIAGNOSIS >

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 FRONT TWEETER 

Description

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The audio unit sends audio signals to the front tweeters using the front tweeter circuits.

Diagnosis Procedure

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1.

HARNESS CHECK

1.

Disconnect audio unit connector M38 (A) and suspect front
tweeter connector (B).

2.

Check continuity between audio unit harness connector M38 (A)
and suspect front tweeter harness connector (B).

3.

Check continuity between audio unit harness connector M38 (A)
and ground.

Are the continuity results as specified?

YES

>> GO TO 2

NO

>> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

2.

TWEETER SIGNAL CHECK

A

B

Continuity

Connector

Terminal

Connector

Terminal

M38

2

M109

1

Yes

3

2

11

M111

1

12

2

A

—

Continuity

Connector

Terminal

M38

2

Ground

No

3

11

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AWNIA0031ZZ

2009 Pathfinder

AV-18

< COMPONENT DIAGNOSIS >

[BASE AUDIO]

FRONT TWEETER

1.

Connect audio unit connector and front tweeter connector.

2.

Turn ignition switch to ACC.

3.

Push “POWER” switch.

4.

Check the signal between audio unit harness connector termi-
nals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified?

YES

>> Replace tweeter. Refer to 

AV-36, "Removal and Installa-

tion"

.

NO

>> Replace audio unit. Refer to 

AV-34, "Removal and

Installation"

.

Connector

Terminals

Condition

Reference signal

(+)

(-)

M38

2

3

Receive audio 
signal

11

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AWNIA0032ZZ

SKIA0177E

2009 Pathfinder

AV

REAR DOOR SPEAKER

AV-19

< COMPONENT DIAGNOSIS >

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REAR DOOR SPEAKER

Description

INFOID:0000000003938931

The audio unit sends audio signals to the rear door speakers using the rear door speaker circuits.

Diagnosis Procedure

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1.

HARNESS CHECK

1.

Disconnect audio unit connector M38 (A) and suspect speaker
connector.

2.

Check continuity between audio unit harness connector M38 (A)
and suspect speaker harness connector (B).

3.

Check continuity between audio unit harness connector M38 (A)
and ground.

Are the continuity results as specified?

YES

>> GO TO 2

NO

>> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

2.

REAR SPEAKER SIGNAL CHECK

A B

Continuity

Connector

Terminal

Connector

Terminal

M38

4

D207

1

Yes

5

2

13

D307

1

14

2

A

—

Continuity

Connector

Terminal

M38

4

Ground

No

5

13

14

AWNIA0033ZZ

2009 Pathfinder