Infiniti QX56 (JA60). Manual - part 63

AV-60

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

Description

INFOID:0000000005146286

DTC Logic

INFOID:0000000005146287

Diagnosis Procedure

INFOID:0000000005146288

Regarding Wiring Diagram information, refer to 

AV-116, "Wiring Diagram"

.

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit. Refer to 

AV-69, "DISPLAY UNIT : Diagnosis Procedure"

.

Is inspection result OK?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect display unit connector M93 and AV control unit connector M43.

3. Check continuity between display unit harness connector M93

(A) terminals 11, 22 and AV control unit harness connector M43

(B) terminals 30, 31.

4. Check continuity between display unit harness connector M93

(A) terminals 11, 22 and ground.

Part name

Description

DISPLAY UNIT

• Display image is controlled by the serial communication from AV control unit.
• RGB image signal is input from AV control unit (RGB, RGB area and RGB syn-

chronizing). Auxiliary image signal is input from the auxiliary input jack. Cam-
era image signal is input from the camera control unit.

• Synchronize signal (HP, VP) is output to AV control unit.
• Touch panel function can be operated for each system by touching a display 

directly.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1243

FRONT DISP CONN
[U1243]

• Display unit power supply and ground circuit malfunc-

tion is detected.

• Malfunction is detected on communication circuit be-

tween display unit and AV control unit.

• Malfunction is detected on communication signal be-

tween display unit and AV control unit.

• Display unit power supply and 

ground circuit.

• Communication circuit between 

display unit and AV control unit.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M93

11

M43

30

Yes

22

31

A

—

Continuity

Connector

Terminal

M93

11

Ground

No

22

ALNIA0397GB

AV

U1243 DISPLAY UNIT

AV-61

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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B

A

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Are continuity results as specified?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK COMMUNICATION SIGNAL

1. Connect display unit connector M93 and AV control unit connec-

tor M43.

2. Turn ignition switch ON.

3. Check signal between display unit harness connector M93 ter-

minal 11 and ground.

Are voltage readings as specified?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-169, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector M93 terminal

22 and ground.

Are voltage readings as specified?

YES

>> Inspection end.

NO

>> Replace display unit. Refer to 

AV-171, "Removal and Installation"

.

Connector

Terminals

Reference Signal

(+)

(-)

M93

11

Ground

ALNIA0398GB

PKIB5039J

Connector

Terminals

Reference Signal

(+)

(-)

M93

22

Ground

ALNIA0399GB

PKIB5039J

AV-62

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U1244 GPS ANTENNA

U1244 GPS ANTENNA

Description

INFOID:0000000005146289

DTC Logic

INFOID:0000000005146290

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005146291

Regarding Wiring Diagram information, refer to 

AV-116, "Wiring Diagram"

.

1.

GPS ANTENNA CHECK

Inspect GPS antenna and antenna feeder for damage or poor connection.
Is the GPS antenna and feeder clean and undamaged?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK AV CONTROL UNIT VOLTAGE 

1. Turn ignition switch ON.

2. Check voltage between AV control unit connector M124 terminal

116 and ground.

Is the voltage reading as specified?

YES

>> Replace GPS antenna. Refer to 

AV-186, "Removal and

Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-169, "Removal and

Installation"

.

Part Name

Description

GPS ANTENNA

GPS signal is detected and transmitted to the AV control unit.

DTC

CONSULT-III display

Detection condition

U1244

GPS ANTENNA CONN
[U1244]

GPS antenna connection malfunction is detected.

116 - Ground

: Approx. 5V

ALNIA0400GB

AV

U1250 CAMERA CONTROL UNIT

AV-63

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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U1250 CAMERA CONTROL UNIT

Description

INFOID:0000000005146292

DTC Logic

INFOID:0000000005146293

Diagnosis Procedure

INFOID:0000000005146294

Regarding Wiring Diagram information, refer to 

AV-116, "Wiring Diagram"

.

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

M45 (A) terminal 84 and camera control unit harness connector

B73 (B) terminal 5.

3. Check continuity between AV control unit harness connector

M45 (A) terminal 84 and ground.

Are the continuity results as specified?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK AV CONTROL UNIT VOLTAGE

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 sent to rear view camera.
• Controlled by audio communication sent 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]

A malfunction is detected in camera-connection recogni-
tion signal circuit.

Camera-connection recognition sig-
nal circuit.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M45

84

B73

5

Yes

A

—

Continuity

Connector

Terminal

M45

84

Ground

No

ALNIA0401GB