Nissan Pathfinder (2011 year). Instruction - part 30

AV

U1240 SWITCH CONN

AV-59

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

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U1240 SWITCH CONN

Description

INFOID:0000000006246463

U1240 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

U1240

• SWITCH CONN

[U1240]

• A/C and AV switch assembly  power supply and ground 

circuit malfunction is detected

• A malfunction is detected in communication circuit be-

tween AV control unit and A/C and AV switch assembly

• A malfunction is detected in communication signal be-

tween AV control unit and A/C and AV switch assembly

• A/C and AV switch assembly power 

supply and ground circuits

• Communication circuit between AV 

control unit and A/C and AV  switch 
assembly

2011 Pathfinder

AV-60

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

Description

INFOID:0000000006246464

DTC Logic

INFOID:0000000006246465

Diagnosis Procedure

INFOID:0000000006246466

Regarding Wiring Diagram information, refer to 

AV-94, "Wiring Diagram"

.

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit. Refer to 

AV-65, "DISPLAY UNIT : Diagnosis Procedure"

.

Is inspection result OK?

YES

>> GO TO 2

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY OF 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 M93

(A) terminals 11, 22 and AV control unit harness connector

M133 (B) terminals 56, 44.

4. Check continuity between display unit harness connector M93

(A) terminals 11, 22 and ground.

Are continuity results as specified?

YES

>> GO TO 3

Part name

Description

DISPLAY UNIT

• Display image is controlled by the serial communication from AV control unit.
• Inputs the RGB image signal (RGB, RGB area and RGB synchronizing) from 

AV control unit and the auxiliary image signal from the auxiliary input jacks.

• Outputs the synchronizing signals (HP and VP) to the AV control unit.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1243

FRONT DISP CONN
[U1243]

• Display unit power supply and ground circuit malfunc-

tion is detected

• Malfunction is detected on communication circuit be-

tween display unit and AV control unit

• Malfunction is detected on communication signal be-

tween display unit and AV control unit

• Display unit power supply and 

ground circuit

• Communication circuit between 

display unit and AV control unit

A

B

Continuity

Connector

Terminal

Connector

Terminal

M93

11

M133

56

Yes

22

44

A

—

Continuity

Connector

Terminal

M93

11

Ground

No

22

ALNIA0310GB

2011 Pathfinder

AV

U1243 DISPLAY UNIT

AV-61

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

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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 M93 ter-

minal 11 and ground with an oscilloscope or CONSULT-III.

Are voltage readings as specified?

YES

>> GO TO 4

NO

>> Replace AV control unit. Refer to 

AV-113, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector M93 terminal

22 and ground with an oscilloscope or CONSULT-III.

Are voltage readings as specified?

YES

>> Inspection End.

NO

>> Replace display unit. Refer to 

AV-115, "Removal and Installation"

.

(+)

(-)

Reference signal

Connector

Terminal

M93

11

Ground

ALNIA0311GB

PKIB5039J

(+)

(-)

Reference signal

Connector

Terminal

M93

22

Ground

ALNIA0312GB

PKIB5039J

2011 Pathfinder

AV-62

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000006246473

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]

• A/C and AV switch assembly  power supply and ground 

circuit malfunction is detected

• A malfunction is detected in communication circuit be-

tween AV control unit and A/C and AV switch assembly

• A malfunction is detected in communication signal be-

tween AV control unit and A/C and AV switch assembly

• A/C and AV switch assembly power 

supply and ground circuits

• Communication circuit between AV 

control unit and A/C and AV  switch 
assembly

2011 Pathfinder

AV

U1310 AV CONTROL UNIT

AV-63

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

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U1310 AV CONTROL UNIT

Description

INFOID:0000000006246474

Replace the AV control unit if this DTC is displayed. Refer to 

AV-113, "Removal and Installation"

.

DTC Logic

INFOID:0000000006246475

Part name

Description

AV CONTROL UNIT

• It is the master unit of the MULTI AV system  and it is connected to each control 

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and combination meter via CAN communication to ob-

tain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and 

parking brake). 

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Action to take

U1310

CONTROL UNIT (AV)
[U1310]

An initial diagnosis error is detected in AV communication 
circuit.

Replace AV control unit. Refer to 

AV-

113, "Removal and Installation"

.

2011 Pathfinder

AV-64

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000006246476

Regarding Wiring Diagram information, refer to 

AV-94, "Wiring Diagram"

.

1.

CHECK FUSES

Check that the following fuses of the AV control unit are not are not blown.

Are the fuses OK?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

POWER SUPPLY CIRCUIT CHECK

1. Disconnect AV control unit connectors M131 and M135. 

2. Check voltage between the AV control unit connectors M131

and M135 and ground.

Are the voltage results as specified?

YES

>> GO TO 3

NO

>> • Check connector housings for disconnected or loose

terminals.

• Repair harness or connector.

3.

GROUND CIRCUIT CHECK

1. Turn ignition switch OFF.

2. Check continuity between AV control unit harness connectors M131, M133, M134, M135 and ground.

Unit

Terminals

Signal name

Fuse No.

AV control unit

19

Battery power

29

7

Ignition switch ACC or ON

4

104

Ignition switch ON or START

12

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M131

7

Ground

0V

Battery 
voltage

Battery 
voltage

19

Ground

Battery 
voltage

Battery 
voltage

Battery 
voltage

M135

104

Ground

0V

0V

Battery 
voltage

ALNIA0875GB

2011 Pathfinder

AV

POWER SUPPLY AND GROUND CIRCUIT

AV-65

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

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Are the continuity results as specified?

YES

>> Inspection End.

NO

>> Repair AV control unit ground.

DISPLAY UNIT
DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000006246477

Regarding Wiring Diagram information, refer to 

AV-94, "Wiring Diagram"

.

1.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch to ACC.

2. Check voltage between display unit harness connector M93 and

ground.

Does specified voltage exist?

YES

>> GO TO 3

NO

>> GO TO 2

2.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect the display unit connector M93 and the AV control

unit connector M133.

3. Check continuity between the display unit harness connector

M93 (A) and the AV control unit connector M133 (B).

4. Check continuity between the display unit harness connector M93 (A) and ground.

Are continuity results as specified?

YES

>> Check AV control unit power and ground supply. Refer to 

AV-64, "AV CONTROL UNIT : Diagnosis

Procedure"

.

NO

>> Repair harness or connector.

(+)

(-)

Continuity

Connector

Terminal

M131

20

Ground

Yes

M133

54

M134

68

M135

85

Signal name

Connector

Terminal

Ignition switch 

position

Value (Approx.)

Inverter VCC

M93

2

ACC

9V

Signal VCC

3

ALNIA0317GB

A

B

Continuity

Connector

Terminal

Connector

Terminal

M93

2

M133

59

Yes

3

47

A

—

Continuity

Connector

Terminal

M93

2

Ground

No

3

ALNIA0318GB

2011 Pathfinder

AV-66

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO]

POWER SUPPLY AND GROUND CIRCUIT

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect display unit connector.

3. Check continuity between display unit harness connector and

ground.

Does continuity exist?

YES

>> Inspection End.

NO

>> Repair harness or connector.

A/C AND AV SWITCH ASSEMBLY
A/C AND AV SWITCH ASSEMBLY : Diagnosis Procedure

INFOID:0000000006246478

Regarding Wiring Diagram information, refer to 

AV-94, "Wiring Diagram"

.

1.

CHECK FUSE

Check that the fuse of the AC and AV switch assembly is not blown.

Is the fuse OK?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

POWER SUPPLY CIRCUIT CHECK

1. Disconnect A/C and AV switch assembly connector M98. 

2. Check voltage between the A/C and AV switch assembly con-

nector M98 and ground.

Are the voltage results as specified?

YES

>> GO TO 3

NO

>> • Check connector housings for disconnected or loose

terminals.

• Repair harness or connector.

3.

GROUND CIRCUIT CHECK

Connector

Terminal

—

Continuity

M93

1

Ground

Yes

ALNIA0319GB

Unit

Terminal

Signal name

Fuse No.

A/C and AV switch assembly

2

Ignition switch ACC or ON

4

(+)

(-)

OFF

ACC

ON

Connector

Terminal

M98

2

Ground

0V

Battery 
voltage

Battery 
voltage

ALNIA0315GB

2011 Pathfinder