Infiniti QX56 (Z62). Manual - part 79

AV-170

< DTC/CIRCUIT DIAGNOSIS >

COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEADREST 

DISPLAY UNIT)

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

Is the inspection result normal?

YES

>> Replace headrest display unit. Refer to 

AV-214, "Exploded View"

.

NO

>> Replace video distributor. Refer to 

AV-215, "Removal and Installation"

.

B554

*1

24

Ground

When DVD, USB or front AUX im-
age is displayed on headrest dis-
play unit LH or RH.

B574

*2

24

SKIB2251J

AV

AUX IMAGE SIGNAL CIRCUIT (FRONT AUXILIARY INPUT JACKS TO AV CON-

TROL UNIT)

AV-171

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

AUX IMAGE SIGNAL CIRCUIT (FRONT AUXILIARY INPUT JACKS TO AV
CONTROL UNIT)

Description

INFOID:0000000006216334

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

Diagnosis Procedure

INFOID:0000000006216335

1.

CHECK CONTINUITY AUX IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front auxiliary input jacks connector and AV control unit connector.

3.

Check continuity between front auxiliary input jacks harness connector and AV control unit harness con-
nector.

4.

Check continuity between front auxiliary input jacks harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AUX IMAGE SIGNAL

1.

Connect front auxiliary input jacks connector and AV control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between front auxiliary input jacks harness connector and ground.

Is the inspection result normal?

YES

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

NO

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

Front auxiliary input jacks

AV control unit

Continuity

Connector

Terminal

Connector

Terminal

M139

7

M209

26

Existed

Front auxiliary input jacks

Ground

Continuity

Connector

Terminal

M139

7

Not existed

(+)

(

−

)

Condition

Reference value

Front auxiliary input jacks

Connector

Terminal

M139

7

Ground

At front AUX image is dis-
played.

SKIB2251J

AV-172

< DTC/CIRCUIT DIAGNOSIS >

AUX IMAGE SIGNAL CIRCUIT (REAR AUXILIARY INPUT JACKS TO VIDEO DIS-

TRIBUTOR)

AUX IMAGE SIGNAL CIRCUIT (REAR AUXILIARY INPUT JACKS TO VID-
EO DISTRIBUTOR)

Description

INFOID:0000000006216336

• Transmits the image signal of AUX device from rear auxiliary input jacks to the video distributor.
• Video distributor transmits the image signal that is input to the headrest display unit.

Diagnosis Procedure

INFOID:0000000006216337

1.

CHECK CONTINUITY AUX IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear auxiliary input jacks connector and video distributor connector.

3.

Check continuity between rear auxiliary input jacks harness connector and video distributor harness con-
nector.

4.

Check continuity between rear auxiliary input jacks harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AUX IMAGE SIGNAL

1.

Connect rear auxiliary input jacks connector and video distributor connector.

2.

Turn ignition switch ON.

3.

Check signal between rear auxiliary input jacks harness connector and ground.

Is the inspection result normal?

YES

>> Replace video distributor. Refer to 

AV-215, "Removal and Installation"

.

NO

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

Rear auxiliary input jacks

Video distributor

Continuity

Connector

Terminal

Connector

Terminal

M98

7

M218

40

Existed

Rear auxiliary input jacks

Ground

Continuity

Connector

Terminal

M98

7

Not existed

(+)

(

−

)

Condition

Reference value

Rear auxiliary input jacks

Connector

Terminal

M98

7

Ground

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

SKIB2251J

AV

IMAGE SWITCH SIGNAL CIRCUIT

AV-173

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

IMAGE SWITCH SIGNAL CIRCUIT

Description

INFOID:0000000006216338

• Image switch signal is input from headrest display unit to video distributor, according to rear seat remote

controller operation.

• When image switch signal is input from headrest display unit to video distributor, image output from AV con-

trol unit and image output from auxiliary input jacks switch.

Diagnosis Procedure

INFOID:0000000006216339

1.

CHECK CONTINUITY IMAGE SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect headrest display unit connector and video distributor connector.

3.

Check continuity between headrest display unit harness connector and video distributor harness connec-
tor.

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

4.

Check continuity between headrest display unit harness connector and ground.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK VIDEO DISTRIBUTOR VOLTAGE 

1.

Connect headrest display unit connector and video distributor connector.

2.

Turn ignition switch ON.

3.

Check voltage between video distributor harness connector and ground.

Headrest display unit

Video distributor

Continuity

Connector

Terminal

Connector

Terminal

B554

*1

20

M217

10

Existed

B574

*2

20

9

Existed

Headrest display unit

Ground

Continuity

Connector

Terminal

B554

*1

20

Not existed

B574

*2

20

(+)

(

−

)

Condition

Voltage

(Approx.)

Video distributor

Connector

Terminal