Infiniti QX56 (Z62). Manual — part 73
AV-146
< DTC/CIRCUIT DIAGNOSIS >
U1258 SATELLITE RADIO ANTENNA
U1258 SATELLITE RADIO ANTENNA
DTC Logic
INFOID:0000000006226137
Diagnosis Procedure
INFOID: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"
.
DTC
Display 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.
(+)
(
−
)
Voltage
(Approx.)
AV control unit
Terminal
159
Ground
5.0 V
AV
U125A HEADREST DISPLAY UNIT
AV-147
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
U125A HEADREST DISPLAY UNIT
DTC Logic
INFOID:0000000006216297
Diagnosis Procedure
INFOID:0000000006216298
1.
CHECK HEADREST DISPLAY UNIT RH POWER SUPPLY AND GROUND CIRCUIT
Check headrest display unit RH power supply and ground circuits. Refer to
.
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
.
Is the inspection result normal?
YES
>> Replace headrest display unit RH. Refer to
NO
>> Repair harness or connector.
DTC
Display contents of
CONSULT-III
DTC Detection Condition
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
AV-148
< DTC/CIRCUIT DIAGNOSIS >
U1263 USB
U1263 USB
DTC Logic
INFOID:0000000006216299
Diagnosis Procedure
INFOID: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.
AV
U1264 ANTENNA AMP.
AV-149
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
U1264 ANTENNA AMP.
DTC Logic
INFOID:0000000006216301
Diagnosis Procedure
INFOID: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"
.
DTC
Display 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
Ground
Continuity
Connector
Terminals
M319
152
Not existed
(+)
(–)
Voltage
(Approx.)
AV control unit
Connector
Terminals
M319
152
Ground
12.0 V
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