Infiniti QX56 (JA60). Manual - part 62

 

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Infiniti QX56 (JA60). Manual - part 62

 

 

AV-56

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U121D AV CONTROL UNIT

U121D AV CONTROL UNIT

Description

INFOID:0000000005146277

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146278

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-III

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-

169, "Removal and Installation"

.

AV

U121E AV CONTROL UNIT

AV-57

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

C

D

E

F

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O

P

U121E AV CONTROL UNIT

Description

INFOID:0000000005146279

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146280

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-III

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-

169, "Removal and Installation"

.

AV-58

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U121F AV CONTROL UNIT

U121F AV CONTROL UNIT

Description

INFOID:0000000005146281

DTC Logic

INFOID:0000000005146282

Diagnosis Procedure

INFOID:0000000005146283

1.

CHECK AV CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

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

AV-68, "AV CONTROL UNIT : Diagnosis Pro-

cedure"

.

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-III

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.

AV

U1220 AV CONTROL UNIT

AV-59

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U1220 AV CONTROL UNIT

Description

INFOID:0000000005146284

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146285

DTC DETECTION LOGIC

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

CONSULT-III display

Detection condition

Action to take

U1220

XM SERIAL COMM
[U1220]

An internal malfunction is detected in AV control unit (sat-
ellite radio tuner communication malfunction).

Replace AV control unit. Refer 
to 

AV-169, "Removal and Instal-

lation"

.

 

 

 

 

 

 

 

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