Nissan Maxima. Manual - part 141

AV-384

< DTC/CIRCUIT DIAGNOSIS >

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U1255 SATELLITE RADIO TUNER

U1255 SATELLITE RADIO TUNER

Description

INFOID:0000000009471336

DTC Logic

INFOID:0000000009471337

Diagnosis Procedure

INFOID:0000000009471338

Regarding Wiring Diagram information, refer to 

AV-449, "Wiring Diagram - With BOSE Audio system Without

Navigation System"

.

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-392, "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 M153 and satellite radio

tuner connector B111.

3. Check continuity between AV control unit harness connector

M153 (A) and satellite radio tuner harness connector B111 (B).

4. Check continuity between AV control unit harness connector M153 (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

M153

28

B111

28

Yes

29

29

30

30

A

—

Continuity

Connector

Terminals

AWNIA2034ZZ

AV

U1255 SATELLITE RADIO TUNER

AV-385

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C

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B

A

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P

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

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 M153

and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-481, "Removal and Installation"

.

4.

CHECK SATELLITE RADIO TUNER

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector.

3. Connect satellite radio tuner.

4. Turn ignition switch ON.

5. Check voltage between satellite radio tuner harness connector

terminal ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace satellite radio tuner. Refer to 

AV-494, "Removal and Installation"

.

M153

28

Ground

No

29

30

(+)

(

−)

Voltage

(Approx.)

Connector

Terminals

M153

28

Ground

7.0V

29

ALNIA1179ZZ

(+)

(

−)

Voltage

(Approx.)

Connector

Terminal

B111

30

Ground

7.0V

ALNIA1180ZZ

AV-386

< DTC/CIRCUIT DIAGNOSIS >

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U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000009471339

U1300 is indicated when a communication signal malfunction occurs. U1300 is indicated along with DTCs that

identify components connected to the AV control unit through communication lines. Determine the possible

malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

DTC

Display contents of 

CONSULT

DTC Detection Condition

Possible causes

U1300
U1240

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

When either one of the following items are detected:
• A/C and AV switch assembly power supply and ground 

circuits are malfunctioning.

• AV communication circuits between AV control unit and 

A/C and AV switch assembly are malfunctioning.

• AV communication signal between AV control unit and 

A/C and AV switch assembly is malfunctioning.

• A/C and AV switch assembly power 

supply and ground circuits.

• AV communication circuits be-

tween AV control unit and A/C and 
AV switch assembly.

AV

U1310 AV CONTROL UNIT

AV-387

< DTC/CIRCUIT DIAGNOSIS >

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U1310 AV CONTROL UNIT

Description

INFOID:0000000009471340

Replace the AV control unit if this DTC is displayed. Refer to 

AV-481, "Removal and Installation"

.

DTC Logic

INFOID:0000000009471341

Part name

Description

AV CONTROL UNIT

• It is the master unit of the MULTI AV system  and it is connected to each control 

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and combination meter via CAN communication to ob-

tain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and 

parking brake). 

DTC

Display contents of 

CONSULT

DTC Detection Condition

Action to take

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication 
circuit.

Replace AV control unit. Refer to 

AV-

481, "Removal and Installation"

.