INFINITI QX56 2011 Factory Service Manual

AV
U1243 FRONT DISPLAY UNITAV-143
< DTC/CIRCUIT DIAGNOSIS >
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U1243 FRONT DISPLAY UNIT
DTC LogicINFOID:0000000006216293
Diagnosis ProcedureINFOID:0000000006216294
1.CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS
Check front display unit power s upply and ground circuits. Refer to AV-161, "
FRONT DISPLAY UNIT : Diagno-
sis Procedure".
Is inspection result normal?
YES >> GO TO 2.
NO >> Repair malfunctioning parts.
2.CHECK CONTINUITY CO MMUNICATION CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect front display unit connector and AV control unit connector.
3. Check continuity between front display unit harness connector and AV control unit harness connector.
4. Check continuity between front display unit harness connector and ground.
Is inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK COMMUNICATION SIGNAL
1. Connect front display unit connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check signal between front display unit harness connector and ground.
DTC Display contents of
CONSULT-III DTC Detection Condit
ion Possible causes
U1243 FRONT DISP CONN
[U1243] When either one of the following items is detected.
 front display unit power supply and ground circuits are
malfunctioning.
 serial communication circuits between front display unit and AV control unit are malfunctioning.  Front display unit power supply and
ground circuits.
 Serial communication circuits be- tween front display unit and AV
control unit.
Front display unit AV control unit Continuity
Connector Terminals Connector Terminals
M215 9
M210 89
Existed
10 73
Front display unit GroundContinuity
Connector Terminals
M215 9
Not existed
10
Revision: 2010 May2011 QX56

AV-144
< DTC/CIRCUIT DIAGNOSIS >
U1243 FRONT DISPLAY UNIT
Is inspection result normal?
YES >> GO TO 4.
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
4.CHECK COMMUNICATION SIGNAL
Check signal between front display unit harness connector and ground.
Is inspection result normal?
YES >> INSPECTION END
NO >> Replace front display unit. Refer to AV-213, "
Removal and Installation".
(+)
(− ) Condition Reference value
Front display unit
Connector Terminal
M215 9 Ground When adjusting display bright-
ness.
PKIB5039J
(+)
(− ) Condition Reference value
Front display unit
Connector Terminal
M215 10 Ground When adjusting display bright-
ness.
PKIB5039J
Revision: 2010 May2011 QX56

AV
U1244 GPS ANTENNAAV-145
< DTC/CIRCUIT DIAGNOSIS >
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U1244 GPS ANTENNA
DTC LogicINFOID:0000000006216295
Diagnosis ProcedureINFOID:0000000006216296
1.GPS ANTENNA CHECK
Visually check GPS antenna and antenna feeder.
Is inspection result normal?
YES >> GO TO 2.
NO >> Repair malfunctioning parts.
2.CHECK AV CONTROL UNIT VOLTAGE
1. Disconnect GPS antenna connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit terminal and ground.
Is inspection result normal?
YES >> INSPECTION END
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
DTCDisplay contents of
CONSULT-III DTC Detection Condit
ion Possible causes
U1244 GPS ANTENNA CONN
[U1244] GPS antenna connection malfunction is detected. GPS antenna disconnection
(+)
(− ) Vol tag e
(Approx.)
AV c o n t r o l u n i t
Te r m i n a l153 Ground 5.0 V
Revision: 2010 May2011 QX56

AV-146
< DTC/CIRCUIT DIAGNOSIS >
U1258 SATELLITE RADIO ANTENNA
U1258 SATELLITE RADIO ANTENNA
DTC LogicINFOID:0000000006226137
Diagnosis ProcedureINFOID:0000000006226138
1.SATELLITE RADIO ANTENNA CHECK
Visually check satellite radio antenna and antenna feeder.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair malfunctioning parts.
2.CHECK AV CONTROL UNIT VOLTAGE
1. Disconnect satellite radio antenna connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
DTCDisplay contents of
CONSULT-III DTC Detection Condition Possible causes
U1258 XM ANTENNA CONN
[U1258] Satellite radio antenna connection malfunction is detect-
ed.
Satellite radio antenna disconnection.
(+)
(− ) Vo l ta g e
(Approx.)
AV c o n t r o l u n i t
Te r m i n a l159 Ground 5.0 V
Revision: 2010 May2011 QX56

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-148
< DTC/CIRCUIT DIAGNOSIS >
U1263 USB
U1263 USB
DTC LogicINFOID:0000000006216299
Diagnosis ProcedureINFOID:0000000006216300
1.CHECK USB HARNESS
Visually check USB harness.
Is the inspection result normal?
YES >> Replace AV control unit. Refer to AV-212, "Removal and Installation".
NO >> Replace USB harness.
DTC Display contents of
CONSULT-III DTC detection condition Possible malfunction factor
U1263 USB OVERCURRENT
[U1263] Detection of overcurrent in USB connector. Check USB harness between the AV
control unit and USB connector.
Revision: 2010 May2011 QX56

AV
U1264 ANTENNA AMP.AV-149
< DTC/CIRCUIT DIAGNOSIS >
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U1264 ANTENNA AMP.
DTC LogicINFOID:0000000006216301
Diagnosis ProcedureINFOID:0000000006216302
1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND ANTENNA AMP.
1. Turn ignition switch OFF.
2. Disconnect antenna amp. connector and AV control unit connector.
3. Check continuity between AV control unit harness connector and antenna amp. 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 VOLTAGE AV CONTROL UNIT
1. Connect 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 antenna amp. Refer to AV-224, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
DTCDisplay contents of
CONSULT-III DTC detection condition Possible malfunction factor
U1264 ANTENNA AMP TER-
MINAL
[U1264] Radio antenna amp. ON circuit is open or shorted.
Check antenna amp. ON signal circuit
between the AV control unit and radio
antenna amp.
AV control unit Antenna amp.
Continuity
Connector Terminals Connector Terminals
M319 152 M313 1 Existed
AV control unit GroundContinuity
Connector Terminals
M319 152 Not existed
(+) (–)Vol tag e
(Approx.)
AV c o n t r o l u n i t
Connector Terminals M319 152 Ground 12.0 V
Revision: 2010 May2011 QX56

AV-150
< DTC/CIRCUIT DIAGNOSIS >
U1265 BOSE AMP.
U1265 BOSE AMP.
DTC LogicINFOID:0000000006216303
Diagnosis ProcedureINFOID:0000000006216304
1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND BOSE AMP.
1. Turn ignition switch OFF.
2. Disconnect BOSE amp. connecto r and AV control unit connector.
3. Check continuity between AV control unit harness connector and BOSE amp. 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 AV CONTROL UNIT
1. Connect 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 BOSE amp. Refer to AV-223, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-212, "
Removal and Installation".
DTCDisplay contents of
CONSULT-III DTC detection condition Possible malfunction factor
U1265 AMP ON TERMINAL
[U1265] BOSE amp. ON signal circuit is open or shorted. Check BOSE amp. ON signal circuit
between the AV control unit and
BOSE amp.
AV control unit BOSE amp.
Continuity
Connector Terminals Connector Terminals
M208 1 B230 20 Existed
AV c o n t r o l u n i t GroundContinuity
Connector Terminals
M208 1 Not existed
(+) (–)Voltage
(Approx.)
AV c o n t r o l u n i t
Connector Terminals M208 1 Ground 12.0 V
Revision: 2010 May2011 QX56

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