Nissan Murano. Manual - part 115

AV-238

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

DTC Logic

INFOID:0000000009721745

Diagnosis Procedure

INFOID:0000000009721746

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit. Refer to 

AV-244, "DISPLAY UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY 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 and AV control unit harness connector.

4.

Check continuity between display unit harness connector and ground.

Is the inspection result normal?

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 and ground.

DTC

Display contents of 

CONSULT

DTC detection condition

Possible malfunction factor

U1243

FRONT DISP CONN
[U1243]

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

functioning.

• serial communication circuits between display unit and 

AV control unit are malfunctioning.

• Display unit power supply and 

ground circuits.

• Serial communication circuits be-

tween display unit and AV control 
unit.

Display unit

AV control unit

Continuity

Connector

Terminals

Connector

Terminals

M194

11

M172

51

Existed

22

39

Display unit

Ground

Continuity

Connector

Terminals

M194

11

Not existed

12

AV

U1243 DISPLAY UNIT

AV-239

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-276, "Exploded View"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace display unit. Refer to 

AV-277, "Exploded View"

.

(+)

(

−

)

Condition

Reference value

Display unit

Connector

Terminal

M194

11

Ground

When adjusting display bright-
ness.

PKIB5039J

(+)

(

−

)

Condition

Reference value

Display unit

Connector

Terminal

M194

22

Ground

When adjusting display bright-
ness.

PKIB5039J

AV-240

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

U1255 SATELLITE RADIO TUNER

U1255 SATELLITE RADIO TUNER

DTC Logic

INFOID:0000000009721747

Diagnosis Procedure

INFOID:0000000009721748

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-246, "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 and satellite radio tuner harness connector.

4.

Check continuity between AV control unit harness connector.

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 signal between AV control unit harness connector and ground.

DTC

Display contents of 

CONSULT

DTC Detection Condition

Possible causes

U1255

SAT CONN
[U1255]

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

malfunctioning.

• communication circuits between AV control unit and 

satellite radio tuner are malfunctioning.

• request signal circuit between AV control unit and sat-

ellite radio tuner are malfunctioning.

• Satellite radio tuner power supply 

and ground circuit.
Refer to 

AV-246, "SATELLITE RA-

DIO TUNER : Diagnosis Proce-
dure"

.

• Communication circuit between AV 

control unit and satellite radio tun-
er.

• Request signal circuit between AV 

control unit and satellite radio tun-
er.

AV control unit

Satellite radio tuner

Continuity

Connector

Terminals

Connector

Terminals

M176

122

B48

10

Existed

129

8

130

9

AV control unit

Ground

Continuity

Connector

Terminals

M176

122

Not existed

129

130

AV

U1255 SATELLITE RADIO TUNER

AV-241

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-276, "Exploded View"

.

4.

CHECK SATELLITE RADIO TUNER VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector.

3.

Connect satellite radio tuner connector.

4.

Turn ignition switch ON.

5.

Check signal between satellite radio tuner harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace satellite radio tuner. Refer to 

AV-297, "Exploded View"

.

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Connector

Terminals

M176

129

Ground

7.0 V

130

7.0 V

(+)

(

−

)

Voltage

(Approx.)

Satellite radio tuner

Connector

Terminal

B48

10

Ground

7.0 V