Infiniti FX35, FX50 (S51). Manual - part 177

AV

U121A AV CONTROL UNIT

AV-481

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121A AV CONTROL UNIT

DTC Logic

INFOID:0000000005474802

Diagnosis Procedure

INFOID:0000000005474803

1.

CHECK MUSIC BOX FUNCTION

Is music box function normal?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-562, "Exploded View"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U121A

HDD WRITE
[U121A]

AV control unit malfunction is detected.

• If the music box function has no 

malfunctions, then there is a possi-
bility of the detection of a temporary 
malfunction.

• Replace the AV control unit if the 

malfunction occurs constantly.

AV-482

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U121B AV CONTROL UNIT

U121B AV CONTROL UNIT

DTC Logic

INFOID:0000000005474805

Diagnosis Procedure

INFOID:0000000005474806

1.

CHECK MUSIC BOX FUNCTION

Is music box function normal?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-562, "Exploded View"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U121B

HDD COMM
[U121B]

AV control unit malfunction is detected.

• If the music box function has no 

malfunctions, then there is a possi-
bility of the detection of a temporary 
malfunction.

• Replace the AV control unit if the 

malfunction occurs constantly.

AV

U121C AV CONTROL UNIT

AV-483

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121C AV CONTROL UNIT

DTC Logic

INFOID:0000000005474808

Diagnosis Procedure

INFOID:0000000005474809

1.

CHECK MUSIC BOX FUNCTION

Is music box function normal?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-562, "Exploded View"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U121C

HDD ACCESS
[U121C]

AV control unit malfunction is detected.

• If the music box function has no 

malfunctions, then there is a possi-
bility of the detection of a temporary 
malfunction.

• Replace the AV control unit if the 

malfunction occurs constantly.

AV-484

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U121D AV CONTROL UNIT

U121D AV CONTROL UNIT

DTC Logic

INFOID:0000000005474811

Diagnosis Procedure

INFOID:0000000005474812

1.

CHECK PLAYBACK OF A DISK (CD)

Can a disk (CD) be played?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-562, "Exploded View"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U121D

DSP CONN
[U121D]

AV control unit malfunction is detected.

• If a disc can be played, then there 

is a possibility of the detection of a 
temporary malfunction.

• Replace the AV control unit if the 

malfunction occurs constantly.