Nissan Pathfinder (2012 year). Manual - part 63

AV-322

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U121A AV CONTROL UNIT

U121A AV CONTROL UNIT

Description

INFOID:0000000007347862

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

AV-420, "Removal and Installation"

.

DTC Logic

INFOID:0000000007347863

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121A

HDD-WRITE
[U121A]

Internal malfunction of AV control unit (HDD write mal-
function) is detected.

Replace AV control unit. Refer to 

AV-

420, "Removal and Installation"

.

August 2012

2012 Pathfinder

AV

U121B AV CONTROL UNIT

AV-323

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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U121B AV CONTROL UNIT

Description

INFOID:0000000007347864

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

AV-420, "Removal and Installation"

.

DTC Logic

INFOID:0000000007347865

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121B

HDD-COMM
[U121B]

Internal malfunction of AV control unit (HDD communica-
tion error) is detected.

Replace AV control unit. Refer to 

AV-

420, "Removal and Installation"

.

August 2012

2012 Pathfinder

AV-324

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U121C AV CONTROL UNIT

U121C AV CONTROL UNIT

Description

INFOID:0000000007347866

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

AV-420, "Removal and Installation"

.

DTC Logic

INFOID:0000000007347867

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121C

HDD-ACCESS
[U121C]

Internal malfunction of AV control unit (HDD access error) 
is detected.

Replace AV control unit. Refer to 

AV-

420, "Removal and Installation"

.

August 2012

2012 Pathfinder

AV

U121D AV CONTROL UNIT

AV-325

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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U121D AV CONTROL UNIT

Description

INFOID:0000000007347868

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

AV-420, "Removal and Installation"

.

DTC Logic

INFOID:0000000007347869

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121D

DSP CONN
[U121D]

Internal malfunction of AV control unit (DSP connection 
error) is detected.

Replace AV control unit. Refer to 

AV-

420, "Removal and Installation"

.

August 2012

2012 Pathfinder

AV-326

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U121E AV CONTROL UNIT

U121E AV CONTROL UNIT

Description

INFOID:0000000007347870

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

AV-420, "Removal and Installation"

.

DTC Logic

INFOID:0000000007347871

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121E

DSP COMM
[U121E]

Internal malfunction of AV control unit (DSP communica-
tion error) is detected.

Replace AV control unit. Refer to 

AV-

420, "Removal and Installation"

.

August 2012

2012 Pathfinder

AV

U121F AV CONTROL UNIT

AV-327

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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U121F AV CONTROL UNIT

Description

INFOID:0000000007347872

DTC Logic

INFOID:0000000007347873

Diagnosis Procedure

INFOID:0000000007347874

1.

CHECK AV CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check audio control unit power supply and ground circuit. Refer to 

AV-334, "AV CONTROL UNIT : Diagnosis

Procedure"

.

Is inspection result OK?

YES

>> Inspection End.

NO

>> Repair malfunctioning parts.

Part name

Description

AV CONTROL UNIT

• Integrates HDD (hard disk drive) allowing map data and music data to be 

stored.

• 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.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, and vehicle information functions.

• 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

DTC Detection Condition

Action to take

U121F

INTERNAL COMM
[U121F]

Internal malfunction of AV control unit (internal communi-
cation error) is detected.

AV control unit power supply and 
ground circuit

August 2012

2012 Pathfinder

AV-328

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

Description

INFOID:0000000007347875

DTC Logic

INFOID:0000000007347876

Diagnosis Procedure

INFOID:0000000007347877

Regarding Wiring Diagram information, refer to 

AV-385, "Wiring Diagram - With Navigation System"

.

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit. Refer to 

AV-335, "DISPLAY UNIT : Diagnosis Procedure"

.

Is inspection result OK?

YES

>> GO TO 2

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect display unit connector M92 and AV control unit connector M37.

3. Check continuity between display unit harness connector M92

(A) terminals 11, 22 and AV control unit harness connector M37

(B) terminals 30, 31.

4. Check continuity between display unit harness connector M92

(A) terminals 11, 22 and ground.

Part name

Description

DISPLAY UNIT

• Display image is controlled by the serial communication from AV control unit.
• RGB image signal is input from AV control unit (RGB, RGB area and RGB syn-

chronizing). Auxiliary image signal is input from the auxiliary input jack. Cam-
era image signal is input from the rear view camera.

• Synchronize signal (HP, VP) is output to AV control unit.
• Touch panel function can be operated for each system by touching a display 

directly.

DTC

Display contents of 

CONSULT

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

M92

11

M37

30

Yes

22

31

A

—

Continuity

Connector

Terminal

M92

11

Ground

No

22

AWNIA1787ZZ

August 2012

2012 Pathfinder

AV

U1243 DISPLAY UNIT

AV-329

< DTC/CIRCUIT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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Are continuity results as specified?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK COMMUNICATION SIGNAL

1. Connect display unit connector M92 and AV control unit connec-

tor M37.

2. Turn ignition switch ON.

3. Check signal between display unit harness connector M92 ter-

minal 11 and ground.

Are voltage readings as specified?

YES

>> GO TO 4

NO

>> Replace AV control unit. Refer to 

AV-420, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector M92 terminal

22 and ground.

Are voltage readings as specified?

YES

>> Inspection End.

NO

>> Replace display unit. Refer to 

AV-422, "Removal and Installation"

.

Connector

Terminals

Reference Signal

(+)

(-)

M92

11

Ground

ALNIA0398GB

PKIB5039J

Connector

Terminals

Reference Signal

(+)

(-)

M92

22

Ground

ALNIA0399GB

PKIB5039J

August 2012

2012 Pathfinder