Infiniti QX56 (Z62). Manual - part 80

AV-174

< DTC/CIRCUIT DIAGNOSIS >

IMAGE SWITCH SIGNAL CIRCUIT

Is the inspection result normal?

YES

>> Replace video distributor. Refer to 

AV-215, "Removal and Installation"

.

NO

>> Replace headrest display unit LH (RH). Refer to 

AV-214, "Exploded View"

.

M217

9

Ground

When DVD, USB or front AUX 
image is displayed on headrest 
display unit RH.

0.5 V

When rear AUX image is dis-
played on headrest display unit 
RH.

4.5 V

10

When DVD, USB or front AUX 
image is displayed on headrest 
display unit LH.

0.5 V

When rear AUX image is dis-
played on headrest display unit 
LH.

4.5 V

AV

LOCATION RECOGNITION SIGNAL CIRCUIT

AV-175

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

LOCATION RECOGNITION SIGNAL CIRCUIT

Description

INFOID:0000000006216340

The headrest display unit operates by recognizing a mounting position by the input of the location recognition
signal.

Diagnosis Procedure

INFOID:0000000006216341

1.

CHECK CONTINUITY LOCATION RECOGNITION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect headrest display unit connector LH (RH).

3.

Check continuity between headrest display unit connector LH (RH) harness connector and ground.

*1: Headrest display unit LH
*2: Headrest display unit RH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

Headrest display unit

Ground

Continuity

Connector

Terminals

B554

*1

10

Existed

B574

*2

9

AV-176

< DTC/CIRCUIT DIAGNOSIS >

DISK EJECT SIGNAL CIRCUIT

DISK EJECT SIGNAL CIRCUIT

Description

INFOID:0000000006216342

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

Diagnosis Procedure

INFOID:0000000006216343

1.

CHECK CONTINUITY DISK 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 and AV control unit harness connector.

4.

Check continuity between multifunction switch harness connector 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 and ground.

Is the inspection result normal?

YES

>> Replace preset switch. Refer to 

AV-227, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

Multifunction switch

AV control unit

Continuity

Connector

Terminal

Connector

Terminal

M72

14

M209

29

Existed

Multifunction switch

Ground

Continuity

Connector

Terminal

M72

14

Not existed

(+)

(

−

)

Condition

Voltage

(Approx.)

AV control unit

Connector

Terminal

M209

29

Ground

Pressing the eject switch

0 V

Except for above

5.0 V

AV

MODE CHANGE SIGNAL CIRCUIT

AV-177

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

MODE CHANGE SIGNAL CIRCUIT

Description

INFOID:0000000006216344

• 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:0000000006216345

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 and AV control unit harness connector.

4.

Check continuity between BOSE amp. harness connector 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 and AV control unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between BOSE amp. harness connector and ground.

Is the inspection result normal?

YES

>> Replace BOSE amp. Refer to 

AV-223, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

AV control unit

BOSE amp.

Continuity

Connector

Terminal

Connector

Terminal

M209

30

B230

37

Existed

BOSE amp.

Ground

Continuity

Connector

Terminal

B230

37

Not existed

(+)

(

−

)

Condition

Voltage

(Approx.)

BOSE amp.

Connector

Terminal

B230

37

Ground

Driver's Audio Stage ON.

0 V

Driver's Audio Stage OFF.

8.5 V