Infiniti G37 Coupe. Manual - part 169

AV

U1244 GPS ANTENNA

AV-429

< COMPONENT DIAGNOSIS >

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U1244 GPS ANTENNA

Description

INFOID:0000000001558838

DTC Logic

INFOID:0000000001558839

Diagnosis Procedure

INFOID:0000000001558840

1.

GPS ANTENNA CHECK

Visually check GPS 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 GPS antenna connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit terminal 110 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit.

Part name

Description

GPS ANTENNA

GPS signal is received and transmitted to AV control unit.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1244

GPS ANETNNA CONN
[U1244]

GPS antenna connection malfunction is detected.

GPS antenna disconnection.

110 - Ground

: Approx. 5 V

AV-430

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U1250 CAMERA CONTROL UNIT

U1250 CAMERA CONTROL UNIT

Description

INFOID:0000000001558841

DTC Logic

INFOID:0000000001558842

Diagnosis Procedure

INFOID:0000000001558843

1.

CHECK CAMERA-CONNECTION RECOGNITION SIGNAL CIRCUIT

1.

Disconnect AV control unit connector and camera control unit connector.

2.

Check continuity between AV control unit harness connector terminal 40 and camera control unit harness
connector terminal 14.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AV CONTROL UNIT VOLTAGE

1.

Connect AV control unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit harness connector terminal 40 and ground.

Is the inspection result normal?

YES

>> Replace camera control unit.

NO

>> Replace AV control unit.

Part name

Description

CAMERA CONTROL UNIT

• Camera image signal is input from rear view camera, and camera image is in-

dicated on the display.

• Power (camera ON signal) is transmitted to rear view camera.
• Controlled by AV communication transmitted from AV control unit.
• AV control unit recognizes the presence of camera system with camera con-

nection recognition signal.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1250

CAMERA CONT. CONN
[U1250]

Malfunction is detected in Camera-connection recognition 
signal circuit.

Camera-connection recognition sig-
nal circuit.

40 - 14

: Continuity should exist.

40 - Ground

: Approx. 5 V

AV

U1258 SATELLITE RADIO ANTENNA

AV-431

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U1258 SATELLITE RADIO ANTENNA

Description

INFOID:0000000001558847

DTC Logic

INFOID:0000000001558848

Diagnosis Procedure

INFOID:0000000001558849

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 terminal 108 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit.

Part name

Description

SATELLITE RADIO ANTENNA

Satellite radio signal is received and transmitted to AV control unit.

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.

108 - Ground

: Approx. 5 V

AV-432

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U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000001558850

U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units 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

Description

Possible malfunction factor/Action to 

take

U1300
U121F

• AV COMM CIRCUIT 

[U1300]

• INTERNAL COMM 

[U121F]

• Malfunction is detected in AV control unit power sup-

ply and ground circuits.

• AV control unit malfunction is detected.

• AV control unit power supply and 

ground circuits.

• When there is no malfunction, AV 

control unit is malfunctioning.

U1300
U1240

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• Multifunction switch power supply and ground circuits 

malfunction is detected.

• Malfunction is detected in AV communication circuits 

between AV control unit and multifunction switch.

• Malfunction is detected in AV communication signal 

between AV control unit and multifunction switch.

• Multifunction switch power supply 

and ground circuits.

• AV communication circuits between 

AV control unit and multifunction 
switch.

U1300
U1252

• AV COMM CIRCUIT 

[U1300]

• REAR CAMERA 

LAN CONN [U1252]

• Malfunction is detected in camera control unit power 

supply and ground circuits.

• Malfunction is detected in AV communication signal 

between AV control unit and camera control unit.

Camera control unit power supply and 
ground circuits.

U1300
U1254

• AV COMM CIRCUIT 

[U1300]

• IPOD CONN [U1254]

• iPod adapter power supply and ground circuits mal-

function is detected.

• Malfunction is detected in AV communication circuits 

between camera control unit and iPod adapter.

• Malfunction is detected in AV communication signal 

between AV control unit and iPod adapter

• iPod adapter power supply and 

ground circuits.

• AV communication circuits between 

camera control unit and iPod adapt-
er.

U1300
U1252
U1254

• AV COMM CIRCUIT 

[U1300]

• REAR CAMERA 

LAN CONN [U1252]

• IPOD CONN [U1254]

Malfunction is detected in AV communication circuits 
between camera control unit and the junction of AV con-
trol unit and multifunction switch. 

AV communication circuits between 
camera control unit and the junction of 
AV control unit and multifunction 
switch.

U1300
U1240
U1252
U1254

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• REAR CAMERA 

LAN CONN [U1252]

• IPOD CONN [U1254]

Malfunction is detected in AV communication circuits 
between AV control unit and the junction of camera con-
trol unit and multifunction switch.

AV communication circuits between 
AV control unit and the junction of 
camera control unit and multifunction 
switch.