Infiniti G35 (V35). Manual - part 128

AUDIO

AV-27

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AV

Trouble Diagnosis

NKS002J9

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The majority of the audio malfunctions are the result of outside causes (bad CD/cassette, electromagnetic
interference, etc.). Check the symptoms below to diagnose the malfunction.

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The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunction-
ing. Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and
operation of each piece of electrical equipment, and then determine the cause.

NOTE:
Noise resulting from variations in field strength, such as fading noise and multi-path noise, or external noise
from trains and other sources. It is not a malfunction.

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Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.

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Multi-path noise: This noise results from a time difference between the broadcast waves directly from the
station arriving at the antenna and the waves reflected by mountains or buildings.

Symptom

Possible malfunction location

Audio system does not work properly.

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Audio unit power supply circuit

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Audio unit

No sound can be heard from all speakers.

Base system

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Audio unit

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TEL ON signal circuit

BOSE system

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BOSE speaker amp. power supply and ground circuit

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BOSE speaker amp. ON signal circuit

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Audio unit

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BOSE speaker amp.

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TEL ON signal circuit

No sound can be heard from one or several speakers.

Base system

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Audio signal circuit between audio unit and speaker

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Speaker

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Tweeter

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Audio unit

BOSE system

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Audio signal circuit between audio unit and BOSE speaker amp.

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Audio signal circuit between BOSE speaker amp. and speaker

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Speaker

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Tweeter

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Audio unit

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BOSE speaker amp.

No sound can be heard from woofer.

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Audio signal circuit between BOSE speaker amp. and woofer

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Woofer

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BOSE speaker amp.

No sound can be heard from radio or noise is caught.

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Antenna amp. ON signal circuit

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Antenna feeder

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Antenna

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Antenna amp.

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Audio unit

AV-28

AUDIO

Power Supply Circuit Inspection

NKS002FA

1. 

CHECK FUSE

Check the following fuses of the BOSE speaker amp. and audio unit.

OK or NG

OK

>> GO TO 2.

NG

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

PG-3, "POWER SUPPLY ROUTING CIRCUIT"

 .

2. 

CHECK POWER SUPPLY CIRCUIT

1.

Check voltage between the audio unit harness connector and
ground.

2.

Check voltage between BOSE speaker amp. harness connector
and ground.

OK or NG

OK

>>

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INSPECTION END (Base system)

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GO TO 3. (BOSE system)

NG

>> Repair harness or connector.

Unit

Connector

Terminal

Signal name

Fuse No.

Audio unit

M40

6

Battery power

37

10

Ignition switch 

ACC or ON

6

BOSE speaker 
amp.

B123

1

Battery power

37

Unit

Terminal No.

OFF

ACC

(+)

(–)

Connec-

tor

Terminal

Audio unit

M40

6

Ground

Battery 
voltage

Battery 
voltage

10

Ground

0 V

Battery 
voltage

PKIA3814E

Unit

Terminal No.

OFF

ACC

(+)

(–)

Connec-

tor

Terminal

BOSE 
speaker amp.

B123

1

Ground

Battery 
voltage

Battery 
voltage

SKIA8541E

AUDIO

AV-29

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AV

3. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BOSE speaker amp. connector. 

3.

Check continuity between BOSE speaker amp. harness connec-
tor B123 terminal 17 and ground.

OK or NG

OK

>> INSPECTION END

NG

>> Repair harness or connector.

Steering Wheel Audio Control Switch Does Not Operate

NKS002FB

WITHOUT TELEPHONE SYSTEM

1. 

CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE

1.

Turn ignition switch OFF.

2.

Disconnect of steering wheel audio control switch connector.

3.

Check resistance of steering wheel audio control switch. Refer to 

AV-26, "Steering Wheel Audio Control

Switch Resistance Inspection"

 .

YES or NO

YES

>> GO TO 2.

NO

>> Replace steering wheel audio control switch.

2. 

CHECK STEERING WHEEL AUDIO CONTROL SWITCH CIRCUIT

1.

Disconnect audio unit connector.

2.

Check continuity between audio unit harness connector M39
and combination switch (spiral cable) harness connector M23.

OK or NG

OK

>> GO TO 3. 

NG

>> Repair harness or connector.

17 - Ground

: Continuity should exist.

SKIA4041E

Resistance value is OK?

Terminals

Continuity

Connector

Terminal

Connector

Terminal

M39

22

M23

24

Yes

23

32

25

31

SKIA4042E

AV-30

AUDIO

3. 

CHECK AUDIO UNIT

1.

Connect audio unit connector. 

2.

Turn ignition switch ON.

3.

Check voltage between audio unit harness connector M39 ter-
minal 22, 23 and ground.

OK or NG

OK

>> Replace combination switch (spiral cable). 

NG

>> Replace audio unit. 

WITH TELEPHONE SYSTEM

Refer to 

AV-105, "Steering Wheel Audio Control Switch Does Not Operate"

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Speed Sensitive Volume System Does Not Work

NKS002FC

1. 

CHECK VEHICLE SPEED OPERATION

Does speedometer operate normally?

YES or NO

YES

>> GO TO 2.

NO

>> Perform combination meter trouble diagnosis. Refer to 

DI-15, "Vehicle Speed Signal Inspection"

in “COMBINATION METERS”.

2. 

CHECK HARNESS

1.

Turn ignition switch OFF.

2.

Disconnect audio unit connector and combination meter connector.

3.

Check continuity between audio unit harness connector M39 ter-
minal 18 and combination meter harness connector M19 termi-
nal 14.

4.

Check continuity between audio unit harness connector M39 ter-
minal 18 and ground.

OK or NG

OK

>> GO TO 3.

NG

>>

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Check connector housings for disconnected or loose
terminals.

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Repair harness or connector.

22 - Ground

: Approx. 5 V

23 - Ground

: Approx. 5 V

SKIB0206E

18 – 14

: Continuity should exist.

18 – Ground

: Continuity should exist.

PKIB3843E