Infiniti G37 Coupe. Manual - part 74

AV

AUX IMAGE SIGNAL CIRCUIT

AV-49

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AUX IMAGE SIGNAL CIRCUIT

Description

INFOID:0000000001689679

• Transmits the image signal of AUX device from auxiliary input jacks to AV control unit.
• AV control unit transmits the image signal that is inputted to the display unit.

Diagnosis Procedure

INFOID:0000000001689678

1.

CHECK CONTINUITY AUX IMAGE SIGNAL CIRCUIT (AUX INPUT JACKS AND AV CONTROL UNIT)

1.

Turn ignition switch OFF.

2.

Disconnect auxiliary input jacks connector and AV control unit connector.

3.

Check continuity between auxiliary input jacks harness connector terminal 7 and AV control unit harness
connector terminal 66.

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 (AUX INPUT JACKS TO AV CONTROL UNIT)

1.

Connect display unit connector and AV control 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

>> GO TO 3.

NO

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

3.

CHECK CONTINUITY AUX IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT AND DISPLAY UNIT)

1.

Turn ignition switch OFF.

2.

Disconnect auxiliary input jacks connector and AV control unit connector.

3.

Check continuity between display unit harness connector terminal 15 and AV control unit harness connec-
tor terminal 36.

4.

Check continuity between display unit harness connector terminal 15 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK AUX IMAGE SIGNAL

7 - 66

: Continuity should exist.

7 - Ground

: Continuity should not exist.

Terminal

Condition

Reference value

7 - Ground

Ignition 

switch 

ON

At AUX image is displayed.

SKIB2251J

15 - 36

: Continuity should exist.

15 - Ground

: Continuity should not exist.

AV-50

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AUX IMAGE SIGNAL CIRCUIT

1.

Connect AV control unit connector and display unit connector.

2.

Turn ignition switch ON.

3.

Check signal between display unit harness connector terminal 15 and ground.

Is the inspection result normal?

YES

>> Replace display unit.

NO

>> Replace AV control unit.

Terminal

Condition

Reference value

15 - Ground

Ignition 

switch 

ON

At AUX image is displayed.

SKIB2251J

AV

CD EJECT SIGNAL CIRCUIT

AV-51

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CD EJECT SIGNAL CIRCUIT

Description

INFOID:0000000001689680

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

Diagnosis Procedure

INFOID:0000000001689681

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 103.

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 103 and ground.

Is the inspection result normal?

YES

>> Replace preset switch.

NO

>> Replace AV control unit.

14 - 103

: Continuity should exist.

14 - Ground

: Continuity should not exist.

103 - Ground

Except for above
: Approx. 3.3 V

AV-52

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COMMUNICATION SIGNAL CIRCUIT (CONT-SAT)

COMMUNICATION SIGNAL CIRCUIT (CONT-SAT)

Description

INFOID:0000000001689682

Satellite radio tuner and AV control unit are connected with a serial communication. They transmit the opera-
tion signal from AV control unit to satellite radio tuner, and transmit the display signal from satellite radio tuner
to AV control unit. 

Diagnosis Procedure

INFOID:0000000001689683

1.

CHECK CONTINUITY COMMUNICATION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect satellite radio tuner connector and AV control unit connector.

3.

Check continuity between satellite radio tuner harness connector terminals 9, 10 and AV control unit har-
ness connector terminals 29, 30.

4.

Check continuity between satellite radio tuner harness connector terminals 9, 10 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK COMMUNICATION SIGNAL

1.

Connect satellite radio tuner connector and AV control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between satellite radio tuner harness connector terminal 9 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace satellite radio tuner.

3.

CHECK COMMUNICATION SIGNAL

Check signal between satellite radio tuner harness connector terminal 10 and ground.

Is the inspection result normal?

YES

>> Replace satellite radio tuner.

9 - 29

: Continuity should exist.

10 - 30

: Continuity should exist.

9, 10 - Ground

: Continuity should not exist.

Terminal

Condition

Reference value

9 - Ground

Ignition 

switch 

ON

When satellite radio mode is se-
lected.

SKIA9300J

Terminal

Condition

Reference value

10 - Ground

Ignition 

switch 

ON

When satellite radio mode is se-
lected.

SKIA9301J