Infiniti QX56 (Z62). Manual - part 70

AV-134

< DTC/CIRCUIT DIAGNOSIS >

U121D AV CONTROL UNIT

U121D AV CONTROL UNIT

DTC Logic

INFOID:0000000006216279

Diagnosis Procedure

INFOID:0000000006216280

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-212, "Removal and Installation"

.

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.
Refer to 

AV-212, "Removal and In-

stallation"

.

AV

U121E AV CONTROL UNIT

AV-135

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121E AV CONTROL UNIT

DTC Logic

INFOID:0000000006216281

Diagnosis Procedure

INFOID:0000000006216282

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-212, "Removal and Installation"

.

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.
Refer to 

AV-212, "Removal and In-

stallation"

.

AV-136

< DTC/CIRCUIT DIAGNOSIS >

U1225 AV CONTROL UNIT

U1225 AV CONTROL UNIT

DTC Logic

INFOID:0000000006216283

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-137

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U1227 AV CONTROL UNIT

DTC Logic

INFOID:0000000006216284

Diagnosis Procedure

INFOID:0000000006216285

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-212, "Removal and Installation"

.

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.
Refer to 

AV-212, "Removal and In-

stallation"

.