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
.
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
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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
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B
A
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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
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