ground INFINITI QX56 2011 Factory Service Manual

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 >
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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 >
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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

AV-174
< DTC/CIRCUIT DIAGNOSIS >
IMAGE SWITCH SIGNAL CIRCUIT
Is the inspection result normal?
YES >> Replace video distributor. Refer to AV-215, "Removal and Installation".
NO >> Replace headrest display unit LH (RH). Refer to AV-214, "
Exploded View".
M2179
Ground When DVD, USB or front AUX
image is displayed on headrest
display unit RH.
0.5 V
When rear AUX image is dis-
played on headrest display unit
RH. 4.5 V
10 When DVD, USB or front AUX
image is displayed on headrest
display unit LH.
0.5 V
When rear AUX image is dis-
played on headrest display unit
LH. 4.5 V
Revision: 2010 May2011 QX56

AV
LOCATION RECOGNITION SIGNAL CIRCUITAV-175
< DTC/CIRCUIT DIAGNOSIS >
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LOCATION RECOGNITION SIGNAL CIRCUIT
DescriptionINFOID:0000000006216340
The headrest display unit operates by recognizing a mounti ng position by the input of the location recognition
signal.
Diagnosis ProcedureINFOID:0000000006216341
1.CHECK CONTINUITY LOCATION RECOGNITION SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headrest display unit connector LH (RH).
3. Check continuity between headrest display unit connector LH (RH) harness connector and ground.
*1: Headrest display unit LH
*2: Headrest display unit RH
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
Headrest display unit
GroundContinuity
Connector Terminals
B554
*110 Existed
B574
*29
Revision: 2010 May2011 QX56

AV-176
< DTC/CIRCUIT DIAGNOSIS >
DISK EJECT SIGNAL CIRCUIT
DISK EJECT SIGNAL CIRCUIT
DescriptionINFOID:0000000006216342
The eject signal is output to AV control unit when the eject switch of multifunction switch is pressed.
Diagnosis ProcedureINFOID:0000000006216343
1.CHECK CONTINUITY DISK EJECT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect multifunction switch c onnector and AV control unit connector.
3. Check continuity between multifunction switch harness connector and AV control unit harness connector.
4. Check continuity between multifunction switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK AV CONTROL UNIT VOLTAGE
1. Connect multifunction switch connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace preset switch. Refer to AV-227, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
Multifunction switch AV control unit
Continuity
Connector Terminal Connector Terminal
M72 14M20929 Existed
Multifunction switch GroundContinuity
Connector Terminal
M72 14 Not existed
(+) (− ) Condition Vo l ta g e
(Approx.)
AV c o n t r o l u n i t
Connector Terminal
M209 29 Ground Pressing the eject switch 0 V
Except for above 5.0 V
Revision: 2010 May2011 QX56

AV
MODE CHANGE SIGNAL CIRCUITAV-177
< DTC/CIRCUIT DIAGNOSIS >
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MODE CHANGE SIGNAL CIRCUIT
DescriptionINFOID:0000000006216344
 AV control unit transmits the mode change signal to BOSE amp.
 Driver's Audio Stage controls the speaker's output characte ristic by BOSE amp. so that the driver's seat is to
be the center of sounds.
Diagnosis ProcedureINFOID:0000000006216345
1.CHECK CONTINUITY MODE CHANGE SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BOSE amp. connector and AV control unit connector.
3. Check continuity between BOSE amp. harness connector and AV control unit harness connector.
4. Check continuity between BO SE amp. harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK MODE CHANGE SIGNAL
1. Connect BOSE amp. connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between BOSE amp. harness connector and ground.
Is the inspection result normal?
YES >> Replace BOSE amp. Refer to AV-223, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
AV control unit BOSE amp.
Continuity
Connector Terminal Connector Terminal
M209 30 B230 37 Existed
BOSE amp. GroundContinuity
Connector Terminal
B230 37 Not existed
(+) (− ) Condition Vo l ta g e
(Approx.)
BOSE amp.
Connector Terminal
B230 37 Ground Driver's Audio Stage ON. 0 V
Driver's Audio Stage OFF. 8.5 V
Revision: 2010 May2011 QX56

AV-178
< DTC/CIRCUIT DIAGNOSIS >
MICROPHONE SIGNAL CIRCUIT
MICROPHONE SIGNAL CIRCUIT
DescriptionINFOID:0000000006216346
Supply power from AV control unit to microphone. The microphone transmits the sound/voice to the AV control
unit.
Diagnosis ProcedureINFOID:0000000006216347
1.CHECK CONTINUITY BETWEEN AV CO NTROL UNIT AND MICROPHONE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AV control unit connector and microphone connector.
3. Check continuity between AV control uni t harness connector and microphone harness connector.
4. Check continuity between AV c ontrol unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK VOLTAGE MICROPHONE VCC
1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
3.CHECK MICROPHONE SIGNAL
1. Connect microphone connector.
2. Check signal between AV control unit harness connector.
AV control unit Microphone Continuity
Connector Terminals Connector Terminals
M210 71
R17 2
Existed
72 4
87 1
AV c o n t r o l u n i t GroundContinuity
Connector Terminals
M210 72
Not existed
87
(+) ( −)
Vo l ta g e
(Approx.)
AV c o n t r o l u n i t
Ground
Connector Terminal
M210 72 5.0 V
Revision: 2010 May2011 QX56

AV-180
< DTC/CIRCUIT DIAGNOSIS >
CAMERA IMAGE SIGNAL CIRCUIT
CAMERA IMAGE SIGNAL CIRCUIT
DescriptionINFOID:0000000006216348
Around view monitor control unit supplies to the front camera, rear camera and side camera. And then it
superimpose the images from each camera and outputs then to the front display unit.
Diagnosis ProcedureINFOID:0000000006216349
1.CHECK CONTINUITY CAMERA IMAGE SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front display unit connector and around view monitor control unit connector.
3. Check continuity between front display unit harne ss connector and around view monitor control unit har-
ness connector.
4. Check continuity between front display unit harness connector and ground.
Is inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK CAMERA IMAGE SIGNAL
1. Connect front display unit connector and around view monitor control unit connector.
2. Turn ignition switch ON.
3. Check signal between front display unit harness connector and ground.
Is inspection result normal?
YES >> Replace front display unit. Refer to AV-212, "Removal and Installation".
NO >> Replace around view monitor control unit. Refer to AV-233, "
Removal and Installation".
Front display unitAround view monitor control
unit Continuity
Connector Terminal Connector Terminal
M215 8 M48 27 Existed
Front display unit GroundContinuity
Connector Terminal
M215 8 Not existed
(+) (− ) Condition Reference value
Front display unit
Connector Terminal
M215 8 Ground At camera image is dis-
played.
SKIB2251J
Revision: 2010 May2011 QX56