Infiniti QX56 (JA60). Manual - part 61

AV-52

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U1219 AV CONTROL UNIT

U1219 AV CONTROL UNIT

Description

INFOID:0000000005146269

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146270

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

U1219

HDD-READ
[U1219]

Internal malfunction of AV control unit (HDD read malfunc-
tion) is detected.

Replace AV control unit. Refer to 

AV-

169, "Removal and Installation"

.

AV

U121A AV CONTROL UNIT

AV-53

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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U121A AV CONTROL UNIT

Description

INFOID:0000000005146271

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146272

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

U121A

HDD-WRITE
[U121A]

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

Replace AV control unit. Refer to 

AV-

169, "Removal and Installation"

.

AV-54

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U121B AV CONTROL UNIT

U121B AV CONTROL UNIT

Description

INFOID:0000000005146273

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146274

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

U121B

HDD-COMM
[U121B]

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

Replace AV control unit. Refer to 

AV-

169, "Removal and Installation"

.

AV

U121C AV CONTROL UNIT

AV-55

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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D

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G

H

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A

O

P

U121C AV CONTROL UNIT

Description

INFOID:0000000005146275

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

AV-169, "Removal and Installation"

.

DTC Logic

INFOID:0000000005146276

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

U121C

HDD-ACCESS
[U121C]

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

Replace AV control unit. Refer to 

AV-

169, "Removal and Installation"

.