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 >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
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 >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
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
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