Infiniti FX35, FX50 (S51). Manual - part 178

AV

U121E AV CONTROL UNIT

AV-485

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121E AV CONTROL UNIT

DTC Logic

INFOID:0000000005474814

Diagnosis Procedure

INFOID:0000000005474815

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

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.

AV-486

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1225 AV CONTROL UNIT

U1225 AV CONTROL UNIT

DTC Logic

INFOID:0000000005474817

DTC DETECTION LOGIC

DTC

Display contents of CON-

SULT-III

DTC detection condition

Possible malfunction factor

U1225

USB CONTROLLER 
[U1225]

USB connection malfunction is detected.

Check that the connection to the USB con-
nector is normal.

AV

U1227 AV CONTROL UNIT

AV-487

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U1227 AV CONTROL UNIT

DTC Logic

INFOID:0000000005474819

Diagnosis Procedure

INFOID:0000000005474820

1.

CHECK PLAYBACK OF A DISK (DVD)

Can a disc (DVD) 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

U1227

DVD COMM [U1227]

AV control unit malfunction is detected.

• If DVD 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-488

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION (TWIN MONITOR)]

U1228 AV CONTROL UNIT

U1228 AV CONTROL UNIT

DTC Logic

INFOID:0000000005474822

DTC DETECTION LOGIC

DTC

Display contents of CON-

SULT-III

DTC detection condition

Possible malfunction factor

U1228

SUB CPU CONN [U1228]

AV control unit malfunction is detected.

Replace the AV control unit if the malfunction 
occurs constantly.