Infiniti G35 (V35) Sedan. Manual - part 147

AV-360

< COMPONENT DIAGNOSIS >

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U1220 AV CONTROL UNIT

U1220 AV CONTROL UNIT

Description

INFOID:0000000000964802

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

AV-530, "Exploded View"

.

DTC Logic

INFOID:0000000000964803

Part name

Description

AV CONTORL 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 unified meter and A/C amp. via CAN communica-

tion to obtain 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

U1220

XM SERIAL COMM
[U1220]

Internal malfunction of AV control unit (satellite radio tuner 
communication error) is detected.

Replace AV control unit

AV

U121A AV CONTROL UNIT

AV-361

< COMPONENT DIAGNOSIS >

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U121A AV CONTROL UNIT

Description

INFOID:0000000000964804

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

AV-530, "Exploded View"

.

DTC Logic

INFOID:0000000000964805

Part name

Description

AV CONTORL 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 unified meter and A/C amp. via CAN communica-

tion to obtain 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

U121A

HDD-WRITE
[U121A]

Internal malfunction of AV control unit (HDD write mal-
function) is detected.

Replace AV control unit

AV-362

< COMPONENT DIAGNOSIS >

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U121B AV CONTROL UNIT

U121B AV CONTROL UNIT

Description

INFOID:0000000000964806

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

AV-530, "Exploded View"

.

DTC Logic

INFOID:0000000000964807

Part name

Description

AV CONTORL 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 unified meter and A/C amp. via CAN communica-

tion to obtain 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

U121B

HDD-COMM
[U121B]

Internal malfunction of AV control unit (HDD communica-
tion error) is detected.

Replace AV control unit

AV

U121C AV CONTROL UNIT

AV-363

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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D

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G

H

I

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K

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N

A

O

P

U121C AV CONTROL UNIT

Description

INFOID:0000000000964808

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

AV-530, "Exploded View"

.

DTC Logic

INFOID:0000000000964809

Part name

Description

AV CONTORL 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 unified meter and A/C amp. via CAN communica-

tion to obtain 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

U121C

HDD-ACCESS
[U121C]

Internal malfunction of AV control unit (HDD access error) 
is detected.

Replace AV control unit