Infiniti QX56 (JA60). Manual — part 61
![](/vehicles/zatt/vend/genn/keseke.png)
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
169, "Removal and Installation"
.
![](/vehicles/zatt/vend/genn/kere.png)
AV
U121A AV CONTROL UNIT
AV-53
< COMPONENT DIAGNOSIS >
[AUDIO SYSTEM]
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
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
![](/vehicles/zatt/vend/genn/jugit.png)
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
169, "Removal and Installation"
.
![](/vehicles/zatt/vend/genn/tey.png)
AV
U121C AV CONTROL UNIT
AV-55
< COMPONENT DIAGNOSIS >
[AUDIO SYSTEM]
C
D
E
F
G
H
I
J
K
L
M
B
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
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