Infiniti G37 Coupe. Manual — part 101
AV
U1255 SATELLITE RADIO TUNER
AV-157
< COMPONENT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1255 SATELLITE RADIO TUNER
Description
INFOID:0000000001559282
DTC Logic
INFOID:0000000001559283
Diagnosis Procedure
INFOID:0000000001559284
1.
CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuit. Refer to
AV-164, "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.
AV-158
< COMPONENT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
U1255 SATELLITE RADIO TUNER
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace AV control unit.
4.
CHECK SATELLITE RADIO TUNER
1.
Turn ignition switch OFF.
2.
Disconnect AV control unit connector.
3.
Connect satellite radio tuner.
4.
Turn ignition switch ON.
5.
Check voltage between satellite radio tuner harness connector terminal 10 and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace satellite radio tuner.
28 - Ground
: Approx 7.5 V
29 - Ground
: Approx 7.0 V
10 - Ground
: Approx 7.0 V
AV
U1300 AV COMM CIRCUIT
AV-159
< COMPONENT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1300 AV COMM CIRCUIT
Description
INFOID:0000000001559016
U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
SELF-DIAGNOSIS RESULTS DISPLAY ITEM
DTC
Display contents of
CONSULT-III
DTC Detection Condition
Possible causes
U1300
U1240
• AV COMM CIRCUIT
[U1300]
• SWITCH CONN
[U1240]
• Multifunction switch power supply and ground circuit
malfunction is detected.
• Malfunction is detected in AV communication circuit be-
tween AV control unit and multifunction switch.
• Malfunction is detected in AV communication signal be-
tween AV control unit and multifunction switch.
• Multifunction switch power supply
and ground circuits.
• AV communication circuit between
AV control unit and multifunction
switch.
U1300
U1254
• AV COMM CIRCUIT
[U1300]
• IPod CONN
[U1254]
• iPod adapter power supply and ground circuit malfunc-
tion is detected.
• Malfunction is detected in AV communication circuit be-
tween AV control unit and iPod adapter.
• A malfunction is detected in AV communication signal
between AV control unit and iPod adapter.
• iPod adapter power supply and
ground circuits.
• AV communication circuit between
AV control unit and iPod adapter.
U1300
U1256
• AV COMM CIRCUIT
[U1300]
• HAND FREE CONN
[U1256]
• TEL adapter unit power supply and ground circuit mal-
function is detected.
• Malfunction is detected in AV communication circuit be-
tween AV control unit and TEL adapter unit.
• Malfunction is detected in AV communication signal be-
tween AV control unit and TEL adapter unit.
• TEL adapter unit power supply and
ground circuit.
• AV communication circuit between
AV control unit and TEL adapter
unit.
U1300
U1240
U1254
U1256
• AV COMM CIRCUIT
[U1300]
• SWITCH CONN
[U1240]
• IPod CONN
[U1254]
• HAND FREE CONN
[U1256]
Malfunction is detected in AV communication circuit be-
tween AV control unit and the branch point multifunction
switch and AV control unit.
AV communication circuit between
AV control unit and the branch point
multifunction switch and AV control
unit.
AV-160
< COMPONENT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure
INFOID:0000000001559017
1.
CHECK FUSE
Check for blown fuses.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Be sure to eliminate cause of malfunction before installing new fuse.
2.
CHECK POWER SUPPLY CIRCUIT
Check voltage between AV control unit harness connectors and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check harness between AV control unit and fuse.
3.
CHECK GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect AV control unit connectors.
3.
Check continuity between AV control unit harness connectors and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair harness or connector.
DISPLAY UNIT
DISPLAY UNIT : Diagnosis Procedure
INFOID:0000000001559018
1.
CHECK POWER SUPPLY CIRCUIT (DISPLAY SIDE)
Check voltage between display unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
Power source
Fuse No.
Battery
34
Ignition switch ACC or ON
19
Ignition switch ON or START
3
Signal name
Connector No.
Terminal No.
Ignition switch position
Value (Approx.)
Battery power supply
M81
19
OFF
12 V
ACC power supply
M81
7
ACC
12 V
Ignition signal
M85
104
ON
12 V
Signal name
Connector No.
Terminal No.
Ignition switch position
Continuity
Ground
M81
20
OFF
Existed
M85
85
Signal name
Connector No.
Terminal No.
Ignition switch position
Value (Approx.)
Inverter VCC
M71
2
ACC
9 V
Signal VCC
3
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