Nissan Maxima. Manual - part 101

AV-224

< DTC/CIRCUIT DIAGNOSIS >

[COLOR DISPLAY - W/O BOSE]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

Description

INFOID:0000000010064862

DTC Logic

INFOID:0000000010064863

Diagnosis Procedure

INFOID:0000000010064864

Regarding Wiring Diagram information, refer to 

AV-282, "Wiring Diagram - Without BOSE Audio System With-

out Navigation System"

.

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit. Refer to 

AV-232, "DISPLAY UNIT : Diagnosis Procedure"

.

Is inspection result OK?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY OF COMMUNICATION CIRCUIT

1. Turn ignition switch OFF.

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

3. Check continuity between display unit harness connector M141

(A) terminals 11, 22 and AV control unit harness connector M117

(B) terminals 56, 44.

4. Check continuity between display unit harness connector M141

(A) terminals 11, 22 and ground.

Are continuity results as specified?

Part name

Description

DISPLAY UNIT

• Display image is controlled by the serial communication from AV control unit.
• Inputs the RGB image signal (RGB, RGB area and RGB synchronizing) from 

AV control unit and the auxiliary image signal from the auxiliary input jacks.

• Outputs the synchronizing signals (HP and VP) to the AV control unit.

DTC

Display contents of 

CONSULT

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

M141

11

M117

56

Yes

22

44

A

—

Continuity

Connector

Terminal

M141

11

Ground

No

22

ALNIA0310GB

AV

U1243 DISPLAY UNIT

AV-225

< DTC/CIRCUIT DIAGNOSIS >

[COLOR DISPLAY - W/O BOSE]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK COMMUNICATION SIGNAL

1. Connect display unit connector and AV control unit connector.

2. Turn ignition switch ON.

3. Check signal between display unit harness connector M141 ter-

minal 11 and ground with an oscilloscope or CONSULT.

Are voltage readings as specified?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-311, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector M141 terminal

22 and ground with an oscilloscope or CONSULT.

Are voltage readings as specified?

YES

>> Inspection End.

NO

>> Replace display unit. Refer to  

AV-314, "Removal and Installation"

.

(+)

(-)

Reference signal

Connector

Terminal

M141

11

Ground

ALNIA0311GB

PKIB5039J

(+)

(-)

Reference signal

Connector

Terminal

M141

22

Ground

ALNIA0312GB

PKIB5039J

AV-226

< DTC/CIRCUIT DIAGNOSIS >

[COLOR DISPLAY - W/O BOSE]

U1263 USB

U1263 USB

DTC Logic

INFOID:0000000010064865

Diagnosis Procedure

INFOID:0000000010064866

1.

CHECK USB HARNESS

Visually check USB harness.
Is the inspection result normal?

YES

>> Replace AV control unit. Refer to 

AV-311, "Removal and Installation"

.

NO

>> Replace USB harness.

DTC

Display contents of 

CONSULT

DTC detection condition

Possible malfunction factor

U1263

USB OVERCURRENT
[U1263]

Detection of over current in USB interface.

Check USB harness between the AV 
control unit and USB interface.

AV

U1255 SATELLITE RADIO TUNER

AV-227

< DTC/CIRCUIT DIAGNOSIS >

[COLOR DISPLAY - W/O BOSE]

C

D

E

F

G

H

I

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K

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M

B

A

O

P

U1255 SATELLITE RADIO TUNER

Description

INFOID:0000000010064867

DTC Logic

INFOID:0000000010064868

Diagnosis Procedure

INFOID:0000000010064869

Regarding Wiring Diagram information, refer to 

AV-282, "Wiring Diagram - Without BOSE Audio System With-

out Navigation System"

.

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

Check satellite radio tuner power supply and ground circuit. Refer to 

AV-234, "SATELLITE RADIO TUNER :

Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M116 and satellite radio

tuner connector B111.

3. Check continuity between AV control unit harness connector

M116 (A) and satellite radio tuner harness connector B111 (B).

4. Check continuity between AV control unit harness connector M116 (A) and ground.

Part name

Description

SATELLITE RADIO TUNER

• Inputs the satellite radio signal from satellite radio antenna and outputs the 

sound signal to the AV control unit.

• It is controlled with the AV control unit and serial communication (communica-

tion signal and request signal).

DTC

Display contents of 

CONSULT

DTC Detection Condition

Possible causes

U1255

SAT CONN
[U1255]

When either one of the following items are detected:
• satellite radio tuner power supply and ground circuits 

are malfunctioning.

• serial communication circuits between AV control unit 

and satellite radio tuner are malfunctioning.

• serial communication or request signal between AV 

control unit and satellite radio tuner is malfunctioning.

• request signal circuit between AV control unit and sat-

ellite radio tuner is malfunctioning.

• Satellite radio tuner power supply 

and ground circuits.

• Serial communication circuits be-

tween AV control unit and satellite 
radio tuner.

• Request signal circuit between AV 

control unit and satellite radio tun-
er.

A

B

Continuity

Connector

Terminals

Connector

Terminals

M116

28

B111

28

Yes

29

29

30

30

A

—

Continuity

Connector

Terminals

AWNIA2034ZZ