2011 INFINITI QX56 display

AV
U1300 AV COMM CIRCUITAV-151
< DTC/CIRCUIT DIAGNOSIS >
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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-152
< DTC/CIRCUIT DIAGNOSIS >
U1310 AV CONTROL UNIT
U1310 AV CONTROL UNIT
DTC LogicINFOID:0000000006216306
DTCDisplay contents of
CONSULT-III DTC detection condition Possible malfunction factor
U1310 CONTROL UNIT (AV)
[U1310] An initial diagnosis error is detected in AV communication
circuit. Replace the AV control unit if the mal-
function occurs constantly.
Refer to
AV- 2 1 2 , "
Removal and In-
stallation".
Revision: 2010 May2011 QX56

AV
POWER SUPPLY AND GROUND CIRCUITAV-161
< DTC/CIRCUIT DIAGNOSIS >
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POWER SUPPLY AND GROUND CIRCUIT
AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006216319
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 AV control unit harness connectors and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check harness between AV control unit and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AV control unit connectors.
3. Check continuity between AV control unit harness connectors and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
FRONT DISPLAY UNIT
FRONT DISPLAY UNIT : Diagnosis ProcedureINFOID:0000000006216320
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 front display unit harness connector and ground.
Power source Fuse No.
Battery 35
Ignition switch ACC or ON 19
Signal name Connector Terminal Ignition switch position Value (Approx.)
Battery power supply M208 19 OFF Battery voltage ACC power supply M208 7 ACC Battery voltage
Signal name Connector Terminal Ignition switch position Continuity Ground M208 20 OFF Existed
Power source Fuse No. Battery 35
Ignition switch ACC or ON 19
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-166
< DTC/CIRCUIT DIAGNOSIS >
RGB DIGITAL IMAGE SIGNAL CIRCUIT
RGB DIGITAL IMAGE SIGNAL CIRCUIT
DescriptionINFOID:0000000006216326
Transmit the image displayed with AV control unit with RGB digital image signal to the front display unit.
Diagnosis ProcedureINFOID:0000000006216327
1.CHECK CONTINUITY RGB DIGI TAL 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 har ness 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 GroundContinuity
Connector Terminals
M322 27
Not existed
28
(+)
(− ) Condition Voltage
(Approx.)
Front display unit
Connector Terminal
M322 27
Ground — 1.3 V
28
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.
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 >
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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