Infiniti G37 Coupe. Manual - part 166

 

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Infiniti G37 Coupe. Manual - part 166

 

 

AV

U121A AV CONTROL UNIT

AV-417

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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U121A AV CONTROL UNIT

Description

INFOID:0000000001682745

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

AV-608, "Exploded View"

.

DTC Logic

INFOID:0000000001558811

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 communication. It operates each system according to communication 
signals from the AV control unit.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, satellite radio 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 is connected to BCM via CAN communication transmitting/receiving for the 

vehicle settings function.

• It inputs the illumination signals that are required for the display dimming con-

trol.

• 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-418

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U121B AV CONTROL UNIT

U121B AV CONTROL UNIT

Description

INFOID:0000000001682746

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

AV-608, "Exploded View"

.

DTC Logic

INFOID:0000000001558813

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 communication. It operates each system according to communication 
signals from the AV control unit.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, satellite radio 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 is connected to BCM via CAN communication transmitting/receiving for the 

vehicle settings function.

• It inputs the illumination signals that are required for the display dimming con-

trol.

• 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-419

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U121C AV CONTROL UNIT

Description

INFOID:0000000001682747

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

AV-608, "Exploded View"

.

DTC Logic

INFOID:0000000001558815

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 communication. It operates each system according to communication 
signals from the AV control unit.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, satellite radio 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 is connected to BCM via CAN communication transmitting/receiving for the 

vehicle settings function.

• It inputs the illumination signals that are required for the display dimming con-

trol.

• 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.

AV-420

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

U121D AV CONTROL UNIT

U121D AV CONTROL UNIT

Description

INFOID:0000000001682748

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

AV-608, "Exploded View"

.

DTC Logic

INFOID:0000000001558817

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 communication. It operates each system according to communication 
signals from the AV control unit.

• The AV control unit includes the audio, hands-free phone, voice control, navi-

gation, satellite radio 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 is connected to BCM via CAN communication transmitting/receiving for the 

vehicle settings function.

• It inputs the illumination signals that are required for the display dimming con-

trol.

• 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.

 

 

 

 

 

 

 

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