Infiniti FX35, FX50 (S51). Manual - part 123

AV

U121B AV CONTROL UNIT

AV-265

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121B AV CONTROL UNIT

DTC Logic

INFOID:0000000005475662

Diagnosis Procedure

INFOID:0000000005475663

1.

CHECK MUSIC BOX FUNCTION

Is music box function normal?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-333, "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-266

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

U121C AV CONTROL UNIT

U121C AV CONTROL UNIT

DTC Logic

INFOID:0000000005475665

Diagnosis Procedure

INFOID:0000000005475666

1.

CHECK MUSIC BOX FUNCTION

Is music box function normal?

YES

>> Malfunction may be detected transitory.

NO

>> Replace AV control unit. Refer to 

AV-333, "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

U121D AV CONTROL UNIT

AV-267

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121D AV CONTROL UNIT

DTC Logic

INFOID:0000000005475668

Diagnosis Procedure

INFOID:0000000005475669

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-333, "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.

AV-268

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (SINGLE MONITOR)]

U121E AV CONTROL UNIT

U121E AV CONTROL UNIT

DTC Logic

INFOID:0000000005475671

Diagnosis Procedure

INFOID:0000000005475672

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-333, "Exploded View"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U121E

DSP COMM
[U121E]

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.