Nissan Murano Z51. Manual - part 81

AV

U1255 SATELLITE RADIO TUNER

AV-103

< DTC/CIRCUIT DIAGNOSIS >

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U1255 SATELLITE RADIO TUNER

Description

INFOID:0000000005528501

DTC Logic

INFOID:0000000005528502

Diagnosis Procedure

INFOID:0000000005528503

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-113, "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 and satellite radio tuner connector.

3.

Check continuity between AV control unit harness connector terminals and satellite radio tuner harness
connector terminals.

4.

Check continuity between AV control unit harness connector terminals and ground.

Is the inspection result normal?

YES

>> GO TO 3.

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-III

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.

AV control unit

Satellite radio tuner

Continuity

Connector

Terminals

Connector

Terminals

M128

28

B48

8

Existed

29

9

30

10

AV control unit

Ground

Continuity

Connector

Terminals

M128

28

Not existed

29

30

AV-104

< DTC/CIRCUIT DIAGNOSIS >

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U1255 SATELLITE RADIO TUNER

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 terminal and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit.

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.

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Connector

Terminals

M128

28

Ground

7.0 V

29

(+)

(

−

)

Voltage

(Approx.)

Satellite radio tuner

Connector

Terminal

B48

10

Ground

7.0 V

AV

U1300 AV COMM CIRCUIT

AV-105

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000005528504

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

DTC Detection Condition

Possible causes

U1300
U1240

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

When either one of the following items are detected:
• multifunction switch power supply and ground circuits 

are malfunctioning.

• AV communication circuits between AV control unit and 

multifunction switch are malfunctioning.

• AV communication signal between AV control unit and 

multifunction switch is malfunctioning.

• Multifunction switch power supply 

and ground circuits.

• AV communication circuits be-

tween AV control unit and multi-
function switch.

U1300
U1246

• AV COMM CIRCUIT 

[U1300]

• VIDEO DIST CONN 

[U1246]

When either one of the following items are detected:
• video distributor power supply and ground circuits are 

malfunctioning.

• AV communication signal between AV control unit and 

video distributor is malfunctioning.

Video distributor power supply and 
ground circuits.

U1300
U1248

• AV COMM CIRCUIT 

[U1300]

• DVD DECK CONN 

[U1248]

When either one of the following items are detected:
• DVD player power supply and ground circuits are mal-

functioning.

• AV communication signal between AV control unit and 

DVD player is malfunctioning.

DVD player power supply and ground 
circuits.

U1300
U1252

• AV COMM CIRCUIT 

[U1300]

• REAR CAMERA LAN 

CONN [U1252]

When either one of the following items are detected:
• camera control unit power supply and ground circuits 

are malfunctioning.

• AV communication signal between AV control unit and 

camera control unit is malfunctioning.

• AV communication circuits between multifunction and 

camera control unit is malfunctioning. (Without DVD en-
tertainment system models)

• Camera control unit power supply 

and ground circuits.

• AV communication circuits be-

tween multifunction and camera 
control unit. (Without DVD enter-
tainment system models)

U1300
U1254

• AV COMM CIRCUIT 

[U1300]

• IPod CONN [U1254]

When either one of the following items are detected:
• iPod adapter power supply and ground circuits are mal-

functioning.

• AV communication circuits between multifunction 

switch and iPod adapter are malfunctioning.

• AV communication signal between AV control unit and 

iPod adapter is malfunctioning.

• iPod adapter power supply and 

ground circuits.

• AV communication circuits be-

tween multifunction switch unit and 
iPod adapter.

U1300
U1256

• AV COMM CIRCUIT 

[U1300]

• HAND FREE CONN 

[U1256]

When either one of the following items are detected:
• TEL adapter unit power supply and ground circuits are 

malfunctioning.

• AV communication circuits between camera control unit 

and TEL adapter unit are malfunctioning.

• AV communication signal between AV control unit and 

TEL adapter unit is malfunctioning.

• TEL adapter unit power supply and 

ground circuits.

• AV communication circuits be-

tween camera control unit and TEL 
adapter unit.

• AV communication circuits be-

tween multifunction switch and TEL 
adapter unit. (without rear view 
camera models)

U1300
U1252

U1256

*

• AV COMM CIRCUIT 

[U1300]

• REAR CAMERA LAN 

CONN [U1252]

• HAND FREE CONN 

[U1256]

*

When either one of the following items are detected:
• AV communication circuits between multifunction 

switch and camera control unit are malfunctioning. 
(without DVD player models)

• AV communication circuits between DVD player and 

camera control unit are malfunctioning. (with DVD play-
er models)

• AV communication circuits be-

tween multifunction switch and 
camera control unit. (without DVD 
player models)

• AV communication circuits be-

tween DVD player and camera 
control unit. (with DVD player mod-
els)

AV-106

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

U1300 AV COMM CIRCUIT

NOTE:

*: Non-equipped item is not displayed.

U1300
U1248
U1252
U1256

• AV COMM CIRCUIT 

[U1300]

• DVD DECK CONN 

[U1248]

• REAR CAMERA LAN 

CONN [U1252]

• HAND FREE CONN 

[U1256]

Malfunction is detected in AV communication circuits be-
tween video distributor and DVD player.

AV communication circuits between 
video distributor and DVD player.

U1300
U1246
U1248
U1252
U1256

• AV COMM CIRCUIT 

[U1300]

• VIDEO DIST CONN 

[U1246]

• DVD DECK CONN 

[U1248]

• REAR CAMERA LAN 

CONN [U1252]

• HAND FREE CONN 

[U1256]

Malfunction is detected in AV communication circuits be-
tween multifunction switch and video distributor.

AV communication circuits between 
multifunction switch and video distrib-
utor.

U1300
U1246
U1248
U1252
U1254
U1256

• AV COMM CIRCUIT 

[U1300]

• VIDEO DIST CONN 

[U1246]

• DVD DECK CONN 

[U1248]

• REAR CAMERA LAN 

CONN [U1252]

• IPod CONN [U1254]
• HAND FREE CONN 

[U1256]

Malfunction is detected in AV communication circuits be-
tween multifunction switch and iPod adapter.

AV communication circuits between 
multifunction switch and iPod adapt-
er.

U1300
U1240

U1254

*

U1256

*

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• IPod CONN [U1254]

*

• HAND FREE CONN 

[U1256]

*

When either one of the following items are detected:
• AV communication circuits between AV control unit and 

the branch point multifunction switch.

• AV communication circuits are malfunctioning.

• AV communication circuits be-

tween AV control unit and the 
branch point multifunction switch.

• Check and repair the short circuit in 

AV communication circuits.

U1300
U1240
U1246
U1248
U1252
U1254
U1256

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• VIDEO DIST CONN 

[U1246]

• DVD DECK CONN 

[U1248]

• REAR CAMERA LAN 

CONN [U1252]

• IPod CONN [U1254]
• HAND FREE CONN 

[U1256]

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes