Nissan Quest E52. Manual - part 121

AV

U1255 SATELLITE RADIO TUNER

AV-363

< DTC/CIRCUIT DIAGNOSIS >

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U1255 SATELLITE RADIO TUNER

DTC Logic

INFOID:0000000009652166

Diagnosis Procedure

INFOID:0000000009652167

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-370, "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 and ground.

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-370, "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

B49

10

Existed

129

8

130

9

AV control unit

Ground

Continuity

Connector

Terminals

M176

122

Not existed

129

130

AV-364

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U1255 SATELLITE RADIO TUNER

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-404, "Removal and Installation"

.

4.

CHECK SATELLITE RADIO TUNER VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector.

3.

Connect satellite radio tuner.

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-424, "Removal and Installation"

.

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Connector

Terminals

M176

129

Ground

7.0 V

130

7.0 V

(+)

(

−

)

Voltage

(Approx.)

Satellite radio tuner

Connector

Terminal

B49

10

Ground

7.0 V

AV

U1300 AV COMM CIRCUIT

AV-365

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000009652168

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

DTC Detection Condition

Possible causes

U1300
U1240

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

When either one of the following items is detected:

• multifunction switch power supply and ground circuits 

are malfunctioning.

• AV communication circuits between AV control unit and 

multifunction switch are 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:
• rear display unit power supply and ground circuits are 

malfunctioning.

• AV communication circuits between AV control unit and 

rear display unit are malfunctioning.

• Rear display unit power supply and 

ground circuits.

• AV communication circuits be-

tween AV control unit and rear dis-
play unit.

U1300
U1256

• AV COMM CIRCUIT 

[U1300]

• HAND FREE CONN 

[U1256]

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

malfunctioning.

• AV communication circuits between AV control unit and 

TEL adapter unit are malfunctioning.

• TEL adapter unit power supply and 

ground circuits.

• AV communication circuits be-

tween AV control unit and TEL 
adapter unit.

U1300
U1240
U1246
U1256

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• VIDEO DIST CONN 

[U1246]

• HAND FREE CONN 

[U1256]

AV communication circuits between AV control unit and 
multifunction switch are malfunctioning.

AV communication circuits between 
AV control unit and multifunction 
switch.

AV-366

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U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009652169

DTC

Display contents of 

CONSULT

DTC detection condition

Possible malfunction factor

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication 
circuit.

Replace the AV control unit if the mal-
function occurs constantly.
Refer to 

AV-404, "Removal and In-

stallation"

.