Infiniti G37 Coupe. Manual — part 70
AV
U1216 AV CONTROL UNIT
AV-33
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
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U1216 AV CONTROL UNIT
Description
INFOID:0000000001684429
Replace the AV control unit if this DTC is displayed. Refer to
DTC Logic
INFOID:0000000001684430
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
U1216
CAN CONT
[U1216]
Internal malfunction of AV control unit (CAN controller) is
detected.
Replace AV control unit.
AV-34
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
U1243 DISPLAY UNIT
U1243 DISPLAY UNIT
Description
INFOID:0000000001689654
DTC Logic
INFOID:0000000001689655
Diagnosis Procedure
INFOID:0000000001689656
1.
CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. Refer to
AV-39, "DISPLAY UNIT : Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair malfunctioning parts.
2.
CHECK CONTINUITY COMMUNICATION CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect display unit connector and AV control unit connector.
3.
Check continuity between display unit harness connector terminals 11, 22 and AV control unit harness
connector terminals 56, 44.
4.
Check continuity between display unit harness connector terminals 11, 22 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK COMMUNICATION SIGNAL
1.
Connect display unit connector and AV control unit connector.
2.
Turn ignition switch ON.
3.
Check signal between display unit harness connector terminal 11 and ground.
Part name
Description
DISPLAY UNIT
• Display image is controlled by the serial communication from AV control unit.
• Inputs the RGB image signal (RGB, RGB area and RGB synchronizing) from
AV control unit and the auxiliary image signal from the auxiliary input jacks.
• Outputs the synchronizing signals (HP and VP) to the AV control unit.
DTC
Display contents of
CONSULT-III
DTC Detection Condition
Possible causes
U1243
FRONT DISP CONN
[U1243]
• Display unit power supply and ground circuit malfunc-
tion is detected.
• Malfunction is detected in communication circuit be-
tween AV control unit and display unit.
• Malfunction is detected in communication signal be-
tween AV control unit and display unit.
• Display unit power supply and
ground circuit.
• Communication circuit between AV
control unit and display unit.
11 - 56
: Continuity should exist.
22 - 44
: Continuity should exist.
11, 22 - Ground
: Continuity should not exist.
AV
U1243 DISPLAY UNIT
AV-35
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
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Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace AV control unit.
4.
CHECK COMMUNICATION SIGNAL
Check signal between display unit harness connector terminal 22 and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace display unit.
Terminal
Condition
Reference value
11 - Ground
Ignition
switch
ON
When adjusting display bright-
ness.
PKIB5039J
Terminal
Condition
Reference value
22 - Ground
Ignition
switch
ON
When adjusting display bright-
ness.
PKIB5039J
AV-36
< COMPONENT DIAGNOSIS >
[BASE AUDIO WITHOUT NAVIGATION]
U1255 SATELLITE RADIO TUNER
U1255 SATELLITE RADIO TUNER
Description
INFOID:0000000001689657
DTC Logic
INFOID:0000000001689658
Diagnosis Procedure
INFOID:0000000001689659
1.
CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuit. Refer to
AV-41, "SATELLITE RADIO TUNER :
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair malfunctioning parts.
2.
CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect AV control unit connector and satellite radio tuner connector.
3.
Check continuity between AV control unit harness connector terminals 28, 29, 30 and satellite radio tuner
harness connector terminals 8, 9, 10.
4.
Check continuity between AV control unit harness connector terminals 28, 29 and 30.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AV CONTROL UNIT VOLTAGE
1.
Connect AV control unit connector.
2.
Turn ignition switch ON.
3.
Check voltage between AV control unit harness connector terminal 28, 29 and ground.
Part name
Description
SATELLITE RADIO TUNER
• Inputs the satellite radio signal from satellite radio antenna and outputs it to the
AV control unit.
• It is controlled with the communication (communication signal, request signal)
from AV control unit.
DTC
Display contents of
CONSULT-III
DTC Detection Condition
Possible causes
U1255
SAT CONN
[U1255]
• Satellite radio tuner power supply and ground circuit
malfunction is detected.
• Malfunction is detected in communication circuit be-
tween AV control unit and satellite radio tuner.
• Malfunction is detected in communication signal be-
tween AV control unit and satellite radio tuner.
• Malfunction is detected in request signal circuit be-
tween AV control unit and satellite radio tuner.
• Satellite radio tuner power supply
and ground circuit.
• Communication circuit between AV
control unit and satellite radio tun-
er.
• Request signal circuit between AV
control unit and satellite radio tun-
er.
28 - 8
: Continuity should exist.
29 - 9
: Continuity should exist.
30 - 10
: Continuity should exist.
28 - Ground
: Continuity should not exist.
29 - Ground
: Continuity should not exist.
30 - Ground
: Continuity should not exist.
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