Infiniti QX56 (Z62). Manual - part 78

AV-166

< DTC/CIRCUIT DIAGNOSIS >

RGB DIGITAL IMAGE SIGNAL CIRCUIT

RGB DIGITAL IMAGE SIGNAL CIRCUIT

Description

INFOID:0000000006216326

Transmit the image displayed with AV control unit with RGB digital image signal to the front display unit.

Diagnosis Procedure

INFOID:0000000006216327

1.

CHECK CONTINUITY RGB DIGITAL IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front display unit connector and AV control unit connector.

3.

Check continuity between front display unit harness connector and AV control unit harness connector.

4.

Check continuity between front display unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK RGB DIGITAL IMAGE SIGNAL

1.

Connect AV control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between front display unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace front display unit. Refer to 

AV-213, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

Front display unit

AV control unit

Continuity

Connector

Terminals

Connector

Terminals

M322

27

M321

157

Existed

28

158

Front display unit

Ground

Continuity

Connector

Terminals

M322

27

Not existed

28

(+)

(

−

)

Condition

Voltage

(Approx.)

Front display unit

Connector

Terminal

M322

27

Ground

—

1.3 V

28

AV

COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT DIS-

PLAY UNIT)

AV-167

< DTC/CIRCUIT DIAGNOSIS >

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COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT
DISPLAY UNIT)

Description

INFOID:0000000006216328

• DVD is played by inserting DVD into the AV control unit.
• DVD image signals are transmitted to the front display unit and video distributor.
• AV control unit receives the image signal from the front auxiliary input jacks and then transmits it to the front

display unit.

• AV control unit receives the image signal from the USB (video data) and then transmits it to the front display

unit and video distributor.

• Video distributor receives the image signal from the AV control unit and then transmits it to the headrest dis-

play unit.

Diagnosis Procedure

INFOID:0000000006216329

1.

CHECK CONTINUITY COMPOSITE IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector and front display unit connector.

3.

Check continuity between AV control unit harness connector and front display unit harness connector.

4.

Check continuity between AV control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK COMPOSITE IMAGE SIGNAL

1.

Connect AV control unit connector and front display unit connector.

2.

Turn ignition switch ON.

3.

Check signal between AV control unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace front display unit. Refer to 

AV-213, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

AV control unit

Front display unit

Continuity

Connector

Terminal

Connector

Terminal

M210

68

M215

18

Existed

AV control unit

Ground

Continuity

Connector

Terminal

M210

68

Not existed

(+)

(

−

)

Condition

Reference value

AV control unit

Connector

Terminal

M210

68

Ground

At DVD image is displayed.

SKIB2251J

AV-168

< DTC/CIRCUIT DIAGNOSIS >

COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO VIDEO DISTRIB-

UTOR)

COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO VIDEO
DISTRIBUTOR)

Description

INFOID:0000000006216330

• DVD is played by inserting DVD into the AV control unit.
• DVD image signals are transmitted to the front display unit and video distributor.
• AV control unit receives the image signal from the front auxiliary input jacks and then transmits it to the front

display unit.

• AV control unit receives the image signal from the USB (video data) and then transmits it to the front display

unit and video distributor.

• Video distributor receives the image signal from the AV control unit and then transmits it to the headrest dis-

play unit.

Diagnosis Procedure

INFOID:0000000006216331

1.

CHECK CONTINUITY COMPOSITE IMAGE SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector and video distributor connector.

3.

Check continuity between AV control unit harness connector and video distributor harness connector.

4.

Check continuity between video distributor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK COMPOSITE IMAGE SIGNAL

1.

Connect AV control unit connector and video distributor connector.

2.

Turn ignition switch ON.

3.

Check signal between video distributor harness connector and ground.

Is the inspection result normal?

YES

>> Replace video distributor. Refer to 

AV-215, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

AV control unit

Video distributor

Continuity

Connector

Terminal

Connector

Terminal

M209

34

M218

34

Existed

Video distributor

Ground

Continuity

Connector

Terminal

M218

34

Not existed

(+)

(

−

)

Condition

Reference value

Video distributor

Connector

Terminal

M218

34

Ground

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

SKIB2251J

AV

COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEADREST 

DISPLAY UNIT)

AV-169

< DTC/CIRCUIT DIAGNOSIS >

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COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEAD-
REST DISPLAY UNIT)

Description

INFOID:0000000006216332

• DVD is played by inserting DVD into the AV control unit.
• DVD image signals are transmitted to the front display unit and video distributor.
• AV control unit receives the image signal from the front auxiliary input jacks and then transmits it to the front

display unit.

• AV control unit receives the image signal from the USB (video data) and then transmits it to the front display

unit and video distributor.

• Video distributor receives the image signal from the AV control unit and then transmits it to the headrest dis-

play unit.

Diagnosis Procedure

INFOID:0000000006216333

1.

CHECK CONTINUITY COMPOSITE IMAGE SIGNAL CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect video distributor connector and headrest display unit connector.

3.

Check continuity between video distributor harness connector and headrest display unit 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 COMPOSITE IMAGE SIGNAL

1.

Connect video distributor connector and rear display unit connector.

2.

Turn ignition switch ON.

3.

Check signal between rear display unit harness connector using an oscilloscope.

Video distributor

Headrest display unit

Continuity

Connector

Terminal

Connector

Terminal

M217

32

B554

*1

24

Existed

28

B574

*2

24

Existed

Headrest display unit

Ground

Continuity

Connector

Terminal

B554

*1

24

Not existed

B574

*2

24

(+)

(

−

)

Condition

Reference value

Headrest display unit

Connector

Terminal