Infiniti FX35, FX50 (S51). Manual - part 180

AV

U1243 FRONT DISPLAY UNIT

AV-493

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

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U1243 FRONT DISPLAY UNIT

DTC Logic

INFOID:0000000005247256

Diagnosis Procedure

INFOID:0000000005247257

1.

CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS

Check front display unit power supply and ground circuits. Refer to 

AV-510, "FRONT DISPLAY UNIT : Diagno-

sis Procedure"

.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION 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 Condition

Possible causes

U1243

FRONT DISP CONN
[U1243]

When either one of the following items is detected.

• front display unit power supply and ground circuit mal-

function is detected.

• malfunction is detected in communication circuits be-

tween front display unit and AV control unit.

• Front display unit power supply and 

ground circuit.

• Communication circuits between 

front display unit and AV control 
unit.

Front display unit

AV control unit

Continuity

Connector

Terminals

Connector

Terminals

M195

9

M210

89

Existed

10

73

Front display unit

Ground

Continuity

Connector

Terminals

M195

9

Not existed

10

AV-494

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1243 FRONT DISPLAY UNIT

Is inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit.

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.

(+)

(

−

)

Condition

Reference value

Front display unit

Connector

Terminal

M195

9

Ground

When adjusting display bright-
ness.

PKIB5039J

(+)

(

−

)

Condition

Reference value

Front display unit

Connector

Terminal

M195

10

Ground

When adjusting display bright-
ness.

PKIB5039J

AV

U1244 GPS ANTENNA

AV-495

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

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U1244 GPS ANTENNA

DTC Logic

INFOID:0000000005247259

Diagnosis Procedure

INFOID:0000000005247260

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.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1244

GPS ANTENNA CONN
[U1244]

GPS antenna connection malfunction is detected.

GPS antenna disconnection

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Terminal

153

Ground

5.0 V

AV-496

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1247 REAR DISPLAY UNIT

U1247 REAR DISPLAY UNIT

DTC Logic

INFOID:0000000005247262

Diagnosis Procedure

INFOID:0000000005247263

1.

CHECK REAR DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check rear display unit power supply and ground circuits. Refer to 

AV-511, "REAR DISPLAY UNIT : Diagnosis

Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY SERIAL COMMUNICATION CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear display unit connector and video distributor connector.

3.

Check continuity between rear display unit harness connector and video distributor harness connector.

4.

Check continuity between rear display unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK SERIAL COMMUNICATION SIGNAL

1.

Connect rear display unit connector and video distributor connector.

2.

Turn ignition switch ON.

3.

Check signal between rear display unit harness connector and ground.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1247

REAR DISP CONN
[U1247]

When either one of the following items is detected:
• rear display unit power supply and ground circuits are 

malfunctioning.

• serial communication circuits between video distributor 

and rear display unit are malfunctioning.

• Rear display unit power supply and 

ground circuits.

• Serial communication circuits be-

tween AV control unit and rear dis-
play unit.

Rear display unit

Video distributor

Continuity

Connector

Terminals

Connector

Terminals

B26

9

M97

39

Existed

10

40

Rear display unit

Ground

Continuity

Connector

Terminals

B26

9

Not existed

10