Nissan Quest E52. Manual - part 83

AV

U1300 AV COMM CIRCUIT

AV-211

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000009652039

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-212

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

U1310 AV CONTROL UNIT

U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009652040

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-250, "Removal and In-

stallation"

.

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-213

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

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POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT

AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000009652041

1.

CHECK FUSE

Check for blown fuses.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Be sure to eliminate cause of malfunction before installing new fuse.

2.

CHECK POWER SUPPLY CIRCUIT

Check voltage between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness between AV control unit and fuse.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connectors.

3.

Check continuity between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

FRONT DISPLAY UNIT

FRONT DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000009652042

1.

CHECK POWER SUPPLY CIRCUIT (DISPLAY SIDE)

Check voltage between display unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

Power source

Fuse No.

Battery

35

Ignition switch ACC or ON

19

Signal name

AV control unit

Probe

Condition

Standard

Reference value

Terminal

Connector

(+)

(

−

)

Ignition switch

Battery power supply

M171

19

20

OFF

9.0 - 15.6 V

Battery voltage

ACC power supply

7

ACC

9.0 - 16.0 V

Signal name

Connector

Terminal

Ignition switch position

Continuity 

Ground

M171

20

OFF

Existed

Signal name

Front display 

unit

Probe

Condition

Standard

Voltage

(Approx.)

Terminal

Connector

(+)

(

−

)

Ignition switch

Inverter VCC

M156

2

17

OFF

8.0 - 9.5 V

8.8 V

Signal VCC

3

14

ACC

AV-214

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

POWER SUPPLY AND GROUND CIRCUIT

2.

CHECK POWER SUPPLY CIRCUIT (CONTINUITY)

1.

Turn ignition switch OFF.

2.

Disconnect the harness connector between front display unit and AV control unit.

3.

Check continuity between front display unit harness connector and AV control unit harness connector. 

4.

Check continuity between front display unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK POWER SUPPLY CIRCUIT (AV CONTROL UNIT SIDE)

1.

Connect the AV control unit harness connector.

2.

Turn ignition switch ACC.

3.

Check voltage between AV control unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit. Refer to 

AV-250, "Removal and Installation"

.

4.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front display unit connector.

3.

Check continuity between front display unit harness connectors and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

REAR DISPLAY UNIT

REAR DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000009652043

1.

CHECK FUSE

Check for blown fuses.

Front display unit

AV control unit

Continuity

Connector

Terminal

Connector

Terminal

M156

2

M172

48

Existed

3

36

Front display unit

Ground

Continuity

Connector

Terminal

M156

2

Not existed

3

Probe

Standard

Voltage

(Approx.)

(+)

(

−

)

AV control unit

Connector

Terminal

Connector

Terminal

M172

48

M172

49

8.0 - 9.5 V

8.8 V

36

37

Signal name

Connector

Terminal

Ignition switch position

Continuity 

Ground

M156

1

OFF

Existed