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 >

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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 

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 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 >

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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