Infiniti G37 Coupe. Manual - part 173

AV

AUX IMAGE SIGNAL CIRCUIT

AV-445

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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AUX IMAGE SIGNAL CIRCUIT

Description

INFOID:0000000001558873

Transmits the image signal of external device from auxiliary input jacks to display unit.

Diagnosis Procedure

INFOID:0000000001558874

1.

CHECK CONTINUITY AUX IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect auxiliary input jacks connector and display unit connector.

3.

Check continuity between auxiliary input jacks harness connector terminal 7 and display unit harness con-
nector terminal 15.

4.

Check continuity between auxiliary input jacks harness connector terminal 7 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AUX IMAGE SIGNAL

1.

Connect auxiliary input jacks connector and display unit connector.

2.

Turn ignition switch ON.

3.

Check signal between auxiliary input jacks harness connector terminal 7 and ground.

Is the inspection result normal?

YES

>> Replace display unit.

NO

>> Check that there is no malfunction in the external device.

7 - 15

: Continuity should exist.

7 - Ground

: Continuity should not exist.

Terminal

Condition

Reference value

7 - Ground

Ignition 

switch 

ON

At AUX image is displayed.

SKIB2251J

AV-446

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

MODE CHANGE SIGNAL CIRCUIT

MODE CHANGE SIGNAL CIRCUIT

Description

INFOID:0000000001907375

• AV control unit transmits the mode change signal to BOSE amp. 
• Driver's Audio Stage controls the speaker's output characteristic by BOSE amp. so that the driver's seat is to

be the center of sounds.

Diagnosis Procedure

INFOID:0000000001907376

1.

CHECK CONTINUITY MODE CHANGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BOSE amp. connector and AV control unit connector.

3.

Check continuity between BOSE amp. harness connector terminal 37 and AV control unit harness con-
nector terminal 44.

4.

Check continuity between BOSE amp. harness connector terminal 37 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK MODE CHANGE SIGNAL

1.

Connect BOSE amp. connector.

2.

Turn ignition switch ON.

3.

Check signal between BOSE amp. harness connector terminal 37 and ground.

Is the inspection result normal?

YES

>> Replace AV control unit.

NO

>> Replace BOSE amp.

37 - 44

: Continuity should exist.

37 - Ground

: Continuity should not exist.

Terminal

Condition

Reference value

37 - Ground

Ignition 

switch 

ON

—

8.5  V

AV

CD EJECT SIGNAL CIRCUIT

AV-447

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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CD EJECT SIGNAL CIRCUIT

Description

INFOID:0000000001558875

The eject signal is output to AV control unit when the eject switch of multifunction switch is pressed.

Diagnosis Procedure

INFOID:0000000001558876

1.

CHECK CONTINUITY CD EJECT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect multifunction switch connector and AV control unit connector.

3.

Check continuity between multifunction switch harness connector terminal 14 and AV control unit harness
connector terminal 85.

4.

Check continuity between multifunction switch harness connector terminal 14 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AV CONTROL UNIT VOLTAGE 

1.

Connect multifunction switch connector and AV control unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit harness connector terminal 85 and ground.

Is the inspection result normal?

YES

>> Replace preset switch.

NO

>> Replace AV control unit.

14 - 85

: Continuity should exist.

14 - Ground

: Continuity should not exist.

85 - Ground

Pressing the eject switch
: Approx. 0 V

85 - Ground

Except for above
: Approx. 5 V

AV-448

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

MICROPHONE SIGNAL CIRCUIT

MICROPHONE SIGNAL CIRCUIT

Description

INFOID:0000000001558877

Supply power from AV control unit to microphone. The microphone transmits the sound/voice to the AV control
unit.

Diagnosis Procedure

INFOID:0000000001558878

1.

CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector and microphone connector.

3.

Check continuity between AV control unit harness connector terminals 26, 27, 28 and microphone har-
ness connector terminals 4, 2, 1.

4.

Check continuity between AV control unit harness connector terminals 26, 28 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK VOLTAGE MICROPHONE VCC 

1.

Connect AV control unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit harness connector terminals 26 and 27.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace AV control unit.

3.

CHECK MICROPHONE SIGNAL 

1.

Connect microphone connector.

2.

Check signal between AV control unit harness connector terminals 28 and 27.

Is the inspection result normal?

YES

>> Replace AV control unit.

NO

>> Replace microphone.

26 - 4

: Continuity should exist.

27 - 2

: Continuity should exist.

28 - 1

: Continuity should exist.

26, 28 - Ground

: Continuity should not exist.

26 - 27

: Approx. 5 V

Terminal

Condition

Reference value

28 - 27

Ignition 

switch 

ON

Give a voice.

PKIB5037J