Nissan Pathfinder. Manual - part 79

AV

U1310 AV CONTROL UNIT

AV-143

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

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U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009174468

CONSULT Display

DTC Detection Condition

Possible Cause

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV com-
munication circuit.

Replace the AV control unit if the malfunction occurs 
constantly.
Refer to 

AV-187, "Removal and Installation"

.

AV-144

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000009174469

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK FUSE

Check that the following fuses are not blown.

Are the fuses blown?

YES

>> Replace the blown fuse after repairing the affected circuit.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect AV control unit connectors M124 and M125.

3. Check voltage between AV control unit connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between AV control unit connector M125 terminal 52 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace harness or connectors.

DISPLAY UNIT
DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000009174470

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT 1

Terminal No.

Signal name

Fuse No.

29

Ignition signal

29 (5A)

39

ACC power supply

65 (10A)

51

Battery power supply

15 (15A)

AV control unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M124

29

—

Ignition switch: ON

Battery voltage

M125

39

Ignition switch: ACC

51

Ignition switch: OFF

AV control unit

Ground

Continuity 

Connector

Terminal

M125

52

—

Yes

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-145

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

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Check voltage between display unit harness connector M93 terminals 2, 3 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M136 and display unit connector.

3. Check continuity between AV control unit connector M136 terminals 64, 76 and display unit connector

M93 terminals 3, 2. 

4. Check continuity between AV control unit connector M136 terminals 64, 76 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK INVERTER VCC AND SIGNAL VCC (POWER SUPPLY) CIRCUIT 2

1. Connect the AV control unit connector M45.

2. Check voltage between AV control unit connector M136 terminals 64, 76 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace AV control unit. Refer to 

AV-187, "Removal and Installation"

.

4.

CHECK INVERTER GROUND AND SIGNAL GROUND CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M45 and display unit connector.

3. Check continuity between AV control unit connector M136 terminals 63, 75 and display unit connector

M93 terminals 14, 13. 

Display unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M93

2

—

Ignition switch: ACC

9.0 V

3

AV control unit

Display unit

Continuity

Connector

Terminal

Connector

Terminal

M136

64

M93

3

Yes

76

2

AV control unit

Ground

Continuity

Connector

Terminal

M136

64

—

No

76

AV control unit

Ground

Condition

Voltage

(Approx.)

(+)

(

−)

Connector

Terminal

M136

64

—

Ignition switch: ACC

9.0 V

76

AV-146

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

POWER SUPPLY AND GROUND CIRCUIT

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness or connectors.

5.

CHECK DISPLAY UNIT GROUND CIRCUIT

Check continuity between display unit connector M93 terminal 1 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace harness or connectors.

SATELLITE RADIO TUNER
SATELLITE RADIO TUNER : Diagnosis Procedure

INFOID:0000000009174471

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK FUSE

Check that the following fuses are not blown.

Are the fuses blown?

YES

>> Replace the blown fuse after repairing the affected circuit.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect satellite radio tuner connector B2.

3. Check voltage between satellite radio tuner connector B2 terminal 32, 36 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between satellite radio tuner connector B2 terminal 35 and ground.

AV control unit

Display unit

Continuity

Connector

Terminal

Connector

Terminal

M136

63

M93

14

Yes

75

13

Display unit

Ground

Continuity

Connector

Terminal

M93

1

—

Yes

Terminal No.

Signal name

Fuse No.

32

Battery power supply

15 (15A)

36

ACC power supply

65 (10A)

Satellite radio tuner

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

B2

32

—

Ignition switch: OFF

Battery voltage

36

Ignition switch: ACC