Infiniti G37 Coupe. Manual — part 69
AV
U1000 CAN COMM CIRCUIT
AV-29
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
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COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000001684419
CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independently). In CAN communication, control units are connected with 2
communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each
control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to
LAN-25, "CAN System Specification Chart"
DTC Logic
INFOID:0000000001684420
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000001684421
1.
PERFORM SELF-DIAGNOSTIC
1.
Turn ignition switch ON and wait for 2 seconds or more.
2.
Check “Self Diagnostic Result” of “MULTI AV”.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Refer to “LAN system”. Refer to
LAN-16, "Trouble Diagnosis Flow Chart"
NO
>> Refer to GI section. Refer to
GI-38, "Intermittent Incident"
.
DTC
Display contents of CON-
SULT-III
Diagnostic item is detected when ...
Probable malfunction location
U1000
CAN COMM CIRCUIT
AV control unit is not transmitting or receiving
CAN communication signal for 2 seconds or
more.
CAN communication system.
AV-30
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000001684422
Initial diagnosis of AV control unit.
DTC Logic
INFOID:0000000001684423
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000001684424
1.
REPLACE AV CONTROL UNIT
When DTC U1010 is detected, replace AV control unit.
>> INSPECTION END
DTC
Display contents of CON-
SULT-III
Diagnostic item is detected when ...
Probable malfunction location
U1010
CONTROL UNIT (CAN)
CAN initial diagnosis malfunction is detected.
AV control unit.
AV
U1310 AV CONTROL UNIT
AV-31
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[BASE AUDIO WITHOUT NAVIGATION]
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U1310 AV CONTROL UNIT
Description
INFOID:0000000001684425
Replace the AV control unit if this DTC is displayed. Refer to
DTC Logic
INFOID:0000000001684426
Part name
Description
AV CONTROL UNIT
• 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.
• AV control unit includes audio function and vehicle information function.
• 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).
• Auxiliary image signal is input from the auxiliary input jacks.
DTC
Display contents of
CONSULT-III
DTC Detection Condition
Action to take
U1310
CONTROL UNIT (AV)
[U1310]
An initial diagnosis error is detected in AV communication
circuit.
Replace AV control unit.
AV-32
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
U1200 AV CONTROL UNIT
U1200 AV CONTROL UNIT
Description
INFOID:0000000001684427
Replace the AV control unit if this DTC is displayed. Refer to
.
DTC Logic
INFOID:0000000001684428
Part name
Description
AV CONTROL UNIT
• 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.
• AV control unit includes audio function and vehicle information function.
• 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).
• Auxiliary image signal is input from the auxiliary input jacks.
DTC
Display contents of
CONSULT-III
DTC Detection Condition
Action to take
U1200
Cont Unit
FLASH- ROM
[U1200]
An internal malfunction is detected in AV control unit
(FLASH-ROM).
Replace AV control unit.
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