headrest INFINITI QX56 2011 Factory Owner's Manual

AV
U125A HEADREST DISPLAY UNITAV-147
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U125A HEADREST DISPLAY UNIT
DTC LogicINFOID:0000000006216297
Diagnosis ProcedureINFOID:0000000006216298
1.CHECK HEADREST DISPLAY UNIT RH POWER SUPPLY AND GROUND CIRCUIT
Check headrest display unit RH power supply and ground circuits. Refer to AV-162, "
HEADREST DISPLAY
UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair malfunctioning parts.
2.CHECK CONTINUITY AV COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headrest display unit LH connector and headrest display unit RH connector.
3. Check continuity between headrest display unit LH harness connector and headrest display unit RH har- ness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK LOCATION RECOGNITION SIGNAL CIRCUIT
Check location recognition signal circuit between headrest display unit RH and ground. Refer to AV-175,
"Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace headrest display unit RH. Refer to AV-214, "Exploded View".
NO >> Repair harness or connector.
DTC Display contents of
CONSULT-III DTC Detection Condit
ion Possible causes
U125A 3RD DISP CONN
[U125A] When either one of the following items are detected:
 headrest display unit RH power supply and ground cir-
cuits are malfunctioning.
 AV communication circuits between headrest display unit LH and headrest display unit RH are malfunction-
ing.
 location recognition signal circuit between headrest dis- play unit RH and ground is malfunctioning.  Headrest display unit RH power
supply and ground circuits.
 AV communication circuits be- tween Headrest display unit LH and
headrest display unit RH.
 Location recognition signal circuit between headrest display unit RH
and ground.
Headrest display unit LH Headrest display unit RH Continuity
Connector Terminals Connector Terminals
B554 11
B574 12
Existed
13 14
Revision: 2010 May2011 QX56

AV
U1300 AV COMM CIRCUITAV-151
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U1300 AV COMM CIRCUIT
DescriptionINFOID:0000000006216305
U1300 is indicated when malfunction occurs in communica tion signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control uni ts connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
SELF-DIAGNOSIS RESULTS DISPLAY ITEM
DTC Display contents of
CONSULT-III DTC detection condition Possible malfunction factor
U1300
U1240  AV COMM CIRCUIT
[U1300]
 SWITCH CONN [U1240] When either one of the following items are detected:
 multifunction switch power supply and ground circuits
are malfunctioning.
 AV communication circuits between AV control unit
and multifunction switch are malfunctioning.  Multifunction switch power supply
and ground circuits.
 AV communication circuits between AV control unit and multifunction
switch.
U1300
U1246  AV COMM CIRCUIT
[U1300]
 VIDEO DIST CONN [U1246] When either one of the following items are detected:
 video distributor power supply and ground circuits are
malfunctioning.
 headrest display unit LH power supply and ground cir- cuits are malfunctioning.
 AV communication circuits between AV control unit and headrest display unit LH are malfunctioning.
 location recognition signal circuit between headrest
display unit LH and ground is malfunctioning.  Video distributor power supply and
ground circuits.
 Headrest display unit LH power sup- ply and ground circuits.
 AV communication circuits between AV control unit and headrest display
unit LH.
 Location recognition signal circuit between headrest display unit LH
and ground.
U1300
U125B  AV COMM CIRCUIT
[U1300]
 AROUND CAMERA
CONN [U125B] When either one of the following items are detected:
 around view monitor control unit power supply and
ground circuits are malfunctioning.
 AV communication circuits between AV control unit
and around view monitor control unit are malfunction-
ing.  Around view monitor control unit
power supply and ground circuits.
 AV communication circuits between AV control unit and around view
monitor control unit.
U1300
U125C  AV COMM CIRCUIT
[U1300]
 SONAR CONN
[U125C] When either one of the following items are detected:
 sonar control unit power supply and ground circuits are
malfunctioning.
 AV communication circuits between AV control unit and sonar control unit are malfunctioning.  Sonar control unit power supply and
ground circuits.
 AV communication circuits between AV control unit and sonar control
unit.
U1300
U1240
U125C U125B  AV COMM CIRCUIT
[U1300]
 SWITCH CONN [U1240]
 SONAR CONN [U125C]
 AROUND CAMERA
CONN [U125B]
AV communication circuits between AV control unit and
multifunction switch are malfunctioning. AV communication circuits between AV
control unit and multifunction switch.
U1300
U1240
U125C U125B U1246  AV COMM CIRCUIT
[U1300]
 SWITCH CONN
[U1240]
 SONAR CONN [U125C]
 AROUND CAMERA CONN [U125B]
 VIDEO DIST CONN
[U1246]
Revision: 2010 May2011 QX56

AV-162
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check harness between front display unit and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front display unit connector.
3. Check continuity between front display unit harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
HEADREST DISPLAY UNIT
HEADREST DISPLAY UNIT : Diagnosis ProcedureINFOID:0000000006216321
1.CHECK FUSE
Check for blown fuses.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Be sure to eliminate cause of malfunction before installing new fuse.
2.CHECK POWER SUPPLY CIRCUIT
Check voltage 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 3.
NO >> Check harness between headrest display unit and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headrest display unit connector.
3. Check continuity between headrest display unit harness connector and ground.
 *1: Headrest display unit LH
 *2: Headrest display unit RH
Signal name Connector Terminal Ignition switch position Value (Approx.)
Battery power su pply M215 11 OFF Battery voltage
ACC power supply M215 23 ACC Battery voltage
Signal name Connector Terminal Ignition switch position Continuity Ground M215 12 OFF Existed
Power source Fuse No. Battery 35
Signal name Connector Terminal Ignition switch position Value (Approx.)
Battery power supply B554
*1
B574*2
2
OFF Battery voltage
4
Signal name Connector Terminal Ignition switch position Continuity
Ground B554
*1
B574*2
1
OFF Existed
3
Revision: 2010 May2011 QX56

AV
COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT DIS-
PLAY UNIT)
AV-167
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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.
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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.
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Revision: 2010 May2011 QX56

AV
COMPOSITE IMAGE SIGNAL CIRCUIT (VIDEO DISTRIBUTOR TO HEADREST
DISPLAY UNIT)
AV-169
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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
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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.
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Revision: 2010 May2011 QX56

AV
IMAGE SWITCH SIGNAL CIRCUITAV-173
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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