2011 INFINITI QX56 AUX

AV-72
< ECU DIAGNOSIS INFORMATION >
AROUND VIEW MONITOR CONTROL UNIT
17
(SB) — AV communication signal (H)
Input/
Output —— —
18
(LG) — AV communication signal (L) Input/
Output —— —
23
(LG) Ground Auxiliary infrared LED power
supply OutputIgnition
switch ON “CAMERA” switch is ON or
shift position is “R”.
5.5 V
27
(W) Ground Camera image signal Output Ignition
switch ON At camera image display
28 — Shield — — — —
29
(Y) 30
(G) Side camera passenger side
image signal
InputIgnition
switch
ON “CAMERA” switch is ON or
shift position is “R”.
31 — Shield — — — —
32
(B) Ground
Side camera passenger side
ground —Ignition
switch
ON —0 V
33
(W) Ground Side camera passenger side
communication signal Input/
Output Ignition
switch ON “CAMERA” switch is ON or
shift position is “R”.
34
(R) Ground Side camera passenger side
power supply OutputIgnition
switch ON “CAMERA” switch is ON or
shift position is “R”.
6.0 V
35
(Y) Ground Rear camera communication
signal Input/
Output Ignition
switch ON “CAMERA” switch is ON or
shift position is “R”.
36
(R) Ground Rear camera power supply Output Ignition
switch ON “CAMERA” switch is ON or
shift position is “R”.
6.0 V
37 — Shield — — — —
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
SKIB2251J
JSNIA0834GB
JSNIA0836GB
JSNIA0836GB
Revision: 2010 May2011 QX56

AV
COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT DIS-
PLAY UNIT)
AV-167
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
COMPOSITE IMAGE SIGNAL CIRCUI T (AV CONTROL UNIT TO FRONT
DISPLAY UNIT)
DescriptionINFOID: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 ProcedureINFOID:0000000006216329
1.CHECK CONTINUITY COMPOS ITE 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 GroundContinuity
Connector Terminal
M210 68 Not existed
(+) (− ) Condition Reference value
AV control unit
Connector Terminal
M210 68 Ground At DVD image is displayed.
SKIB2251J
Revision: 2010 May2011 QX56

AV-168
< DTC/CIRCUIT DIAGNOSIS >
COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO VIDEO DISTRIB-
UTOR)
COMPOSITE IMAGE SIGNAL CIRCUI T (AV CONTROL UNIT TO VIDEO
DISTRIBUTOR)
DescriptionINFOID: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 ProcedureINFOID:0000000006216331
1.CHECK CONTINUITY COMPOS ITE 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 har ness 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 GroundContinuity
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
Revision: 2010 May2011 QX56

AV
COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEADREST
DISPLAY UNIT)
AV-169
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEAD-
REST DISPLAY UNIT)
DescriptionINFOID: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 ProcedureINFOID:0000000006216333
1.CHECK CONTINUITY COMPOS ITE IMAGE SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect video distributor connecto r and headrest display unit connector.
3. Check continuity between video distributor harne ss 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
*124 Existed
28 B574
*224 Existed
Headrest display unit GroundContinuity
Connector Terminal
B554
*124 Not existed
B574
*224
(+)
(− ) Condition Reference value
Headrest display unit
Connector Terminal
Revision: 2010 May2011 QX56

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*124
GroundWhen DVD, USB or front AUX im-
age is displayed on headrest dis-
play unit LH or RH.
B574
*224
SKIB2251J
Revision: 2010 May2011 QX56

AV
AUX IMAGE SIGNAL CIRCUIT (FRONT AUXILIARY INPUT JACKS TO AV CON-
TROL UNIT)
AV-171
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
AUX IMAGE SIGNAL CIRCUIT (FRONT AUXILIARY INPUT JACKS TO AV
CONTROL UNIT)
DescriptionINFOID:0000000006216334
 Transmits the image signal of AUX device from fr ont auxiliary input jacks to AV control unit.
 AV control unit transmits the image signal t hat is input to the front display unit.
Diagnosis ProcedureINFOID: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 auxiliar y 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 malf unction 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 GroundContinuity
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
Revision: 2010 May2011 QX56

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)
DescriptionINFOID:0000000006216336
 Transmits the image signal of AUX device from r ear auxiliary input jacks to the video distributor.
 Video distributor transmits the image signal that is input to the headrest display unit.
Diagnosis ProcedureINFOID: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 auxili ary 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 GroundContinuity
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
Revision: 2010 May2011 QX56

AV
IMAGE SWITCH SIGNAL CIRCUITAV-173
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
IMAGE SWITCH SIGNAL CIRCUIT
DescriptionINFOID: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 displa y unit to video distributor, image output from AV con-
trol unit and image output from auxiliary input jacks switch.
Diagnosis ProcedureINFOID: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 har ness 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
*120 M217 10 Existed
B574
*220 9 Existed
Headrest display unit GroundContinuity
Connector Terminal
B554
*120 Not existed
B574
*220
(+)
(− ) Condition Vo l ta g e
(Approx.)
Video distributor
Connector Terminal
Revision: 2010 May2011 QX56