INFINITI QX56 2007 Factory Service Manual

AUDIO
AV-31
< SERVICE INFORMATION >
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• Loss of power to the satellite radio tuner (factory installed)
• Open or short in the REQ1, TXD, or RXD circuits.
If the satellite antenna is disconnected or inoperative, the display unit will display ANTENNA.
Noise InspectionINFOID:0000000003533674
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and opera-
tion of each piece of electrical equipment, and determine the cause.
NOTE:
The source of the noise can be found easily by listening to the noise while removing the fuses of electrical
components, one by one.
TYPE OF NOISE AND POSSIBLE CAUSE
Power Supply Circuit InspectionINFOID:0000000003533675
1.CHECK FUSES
Check that the following fuses are not blown.
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to PG-
3.
2.POWER SUPPLY CIRCUIT CHECK
1. Disconnect audio unit connector M43, subwoofer connector B72 and BOSE speaker amp. connector
M112.
2. Check voltage between the audio unit and ground.
Occurrence condition Possible cause
Occurs only when engine is ON.A continuous growling noise occurs. The speed of
the noise varies with changes in the engine speed.• Ignition components
A whistling noise occurs while the engine speed is
high. A booming noise occurs while the engine is
running and the lighting switch is ON.• Generator
The occurrence of the noise is linked with the operation of the fuel pump. • Fuel pump condenser
Noise only occurs when various
electrical components are oper-
ating.A cracking or snapping sound occurs with the op-
eration of various switches.• Relay malfunction, audio unit malfunction
The noise occurs when various motors are operat-
ing.• Motor case ground
•Motor
The noise occurs constantly, not just under certain conditions.• Rear defogger coil malfunction
• Open circuit in printed heater
• Poor ground of antenna amplifier or anten-
na feeder line
A cracking or snapping sound occurs while the vehicle is being driven, especially when
it is vibrating excessively.• Ground wire of body parts
• Ground due to improper part installation
• Wiring connections or a short circuit
Unit Terminals Signal name Fuse No.
Audio unit6 Battery power 31
10 Ignition switch ACC or ON 4
AV switch1 Battery power 31
2 Ignition switch ACC or ON 4
BOSE speaker amp. 1 Battery power 31
Subwoofer 6 Battery power 17

AV-32
< SERVICE INFORMATION >
AUDIO
3. Check voltage between subwoofer and ground.
4. Check voltage between BOSE speaker amp. and ground.
OK or NG
OK >> GO TO 3.
NG >> • Check connector housings for disconnected or loose
terminals.
• Repair harness or connector.
3.GROUND CIRCUIT CHECK
Check continuity between subwoofer harness connector B72 termi-
nal 5 and BOSE speaker amp. harness connector M112 terminal 17
and ground.
OK or NG
OK >> Inspection End.
NG >> • Check connector housings for disconnected or loose
terminals.
• Repair harness or connector.
Satellite Radio Tuner (Factory Installed) Power and Ground Supply Circuit Inspection
INFOID:0000000003533676
1.CHECK FUSES
• Check that the following fuses are not blown.
UnitTe r m i n a l N o .
OFF ACC ON (+)
(-)
Connector Terminal
Audio unit M436GroundBattery
voltageBattery
voltageBattery
voltage
10 Ground 0 VBattery
voltageBattery
voltage
SKIA1992E
UnitTe r m i n a l N o .
OFF ACC ON (+)
(-)
Connector Terminal
Subwoof-
erB72 6 GroundBattery
voltageBattery
voltageBattery
voltage
WKIA1598E
UnitTe r m i n a l N o .
OFF ACC ON (+)
(-)
Connector Terminal
BOSE
speaker
amp.M112 1 GroundBattery
voltageBattery
voltageBattery
voltage
SKIA4311E
Continuity should exist.
WKIA1599E

AUDIO
AV-33
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to PG-
3.
2.POWER SUPPLY CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) M41 connector.
3. Check voltage between the satellite radio tuner (factory installed) and ground.
OK or NG
OK >> GO TO 3.
NG >> • Check connector housings for disconnected or loose
terminals.
• Repair harness or connector.
3.GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Inspect satellite radio tuner (factory installed) case ground.
3. Disconnect satellite radio tuner (factory installed) connector M41 (A) and audio unit connector M42 (B).
4. Check continuity between satellite radio tuner (factory installed) and audio unit.
OK or NG
OK >> Inspection End.
NG >> • Check connector housings for disconnected or loose
terminals.
• Repair harness, connector or satellite radio tuner (factory installed) case ground.
Satellite Radio Tuner (Factory Installed) Communication Circuit InspectionINFOID:0000000003533677
1.CHECK HARNESS - 1
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M42.
Unit Terminals Signal name Fuse No.
Satellite radio tuner (factory in-
stalled)32 Battery power 31
36 Ignition switch ACC or ON 4
UnitTerminal No.
OFF ACC ON (+)
(-)
Connector Terminal
Satellite
radio tuner
(factory in-
stalled)M4132 GroundBattery
voltageBattery
voltageBattery
voltage
36 Ground 0VBattery
voltageBattery
voltage
WKIA4539E
Te r m i n a l s
Continuity Satellite radio tuner (factory in-
stalled)Audio unit
Connector Terminal Connector Terminal
A: M4125
B: M4245
Ye s
26 46
WKIA4540E

AV-34
< SERVICE INFORMATION >
AUDIO
3. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 28 and audio unit harness
connector M42 (B) terminal 48
4. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 28 and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2.CHECK HARNESS - 2
1. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 29 and audio unit harness
connector M42 (B) terminal 49
2. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 29 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK HARNESS - 3
1. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 30 and audio unit harness
connector M42 (B) terminal 50
2. Check continuity between satellite radio tuner (factory installed)
harness connector M41 (A) terminal 30 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK REQ1 SIGNAL
1. Connect satellite radio tuner (factory installed) connector and audio unit connector.
2. Turn ignition switch to ACC
3. Check signal between satellite radio tuner (factory installed) har-
ness connector M41 terminal 28 and ground with CONSULT-ll or
oscilloscope.
OK or NG
OK >> GO TO 5.Continuity should exist.
Continuity should not exist.
WKIA4541E
Continuity should exist.
Continuity should not exist.
WKIA4542E
Continuity should exist.
Continuity should not exist.
WKIA4543E
28 - Ground : Refer to AV-28, "Terminal
and Reference Value for Satel-
lite Radio Tuner (Factory In-
stalled)".
WKIA4544E

AUDIO
AV-35
< SERVICE INFORMATION >
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NG >> Replace audio unit. Refer to AV-46, "Removal and Installation".
5.CHECK TXD SIGNAL
1. Check signal between satellite radio tuner (factory installed) har-
ness connector M41 terminal 29 and ground with CONSULT-ll or
oscilloscope.
OK or NG
OK >> GO TO 6.
NG >> Replace audio unit. Refer to AV-46, "
Removal and
Installation".
6.CHECK RXD SIGNAL
1. Check signal between satellite radio tuner (factory installed) har-
ness connector M41 terminal 30 and ground with CONSULT-ll or
oscilloscope.
OK or NG
OK >> Replace satellite radio tuner (factory installed). Refer to
AV-46, "
Removal and Installation".
NG >> Replace audio unit. Refer to AV-46, "
Removal and Installation".
Satellite Radio Tuner (Factory Installed) Left Channel Audio Signal Circuit Inspection
INFOID:0000000003533678
1.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M41 (A) and audio unit connector M42 (B).
3. Check continuity between satellite radio tuner (factory installed) and audio unit.
4. Check continuity between satellite radio tuner (factory installed)
and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.29 - Ground : Refer to AV-28, "
Terminal
and Reference Value for Satel-
lite Radio Tuner (Factory In-
stalled)".
WKIA4545E
30 - Ground : Refer to AV-28, "Terminal
and Reference Value for Satel-
lite Radio Tuner (Factory In-
stalled)".
WKIA4546E
Te r m i n a l s
Continuity Satellite radio tuner (factory in-
stalled)Audio unit
Connector Terminal Connector Terminal
A: M4121
B: M4241
Ye s
22 42
Te r m i n a l s
Continuity Satellite radio tuner (factory installed)
—
Connector Terminal
A: M4121
Ground No
22
WKIA4547E

AV-36
< SERVICE INFORMATION >
AUDIO
2.CHECK LEFT CHANNEL AUDIO SIGNAL
1. Connect satellite radio tuner (factory installed) and audio unit.
2. Turn ignition switch ON.
3. Check signal between satellite radio tuner (factory installed)
connector M41 terminals 21 and 22 with CONSULT-ll or oscillo-
scope.
OK or NG
OK >> Replace satellite radio tuner (factory installed). Refer to
AV-46, "
Removal and Installation".
NG >> Replace audio unit. Refer to AV-46, "
Removal and Installation".
Satellite Radio Tuner (Factory Installed) Right Channel Audio Signal Circuit Inspection
INFOID:0000000003533679
1.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M41 (A) and audio unit connector M42 (B).
3. Check continuity between satellite radio tuner (factory installed) and audio unit.
4. Check continuity between satellite radio tuner (factory installed)
and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2.CHECK RIGHT CHANNEL AUDIO SIGNAL
1. Connect satellite radio tuner (factory installed) and audio unit.
2. Turn ignition switch ON.21 - 22 : Refer to AV-28, "
Terminal
and Reference Value for Sat-
ellite Radio Tuner (Factory In-
stalled)".
WKIA4548E
Te r m i n a l s
Continuity Satellite radio tuner (factory in-
stalled)Audio unit
Connector Terminal Connector Terminal
A: M4123
B: M4243
Ye s
24 44
Te r m i n a l s
Continuity Satellite radio tuner (factory installed)
—
Connector Terminal
A: M4123
Ground No
24
WKIA4549E

AUDIO
AV-37
< SERVICE INFORMATION >
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3. Check signal between satellite radio tuner (factory installed)
connector M41 terminals 23 and 24 with CONSULT-ll or oscillo-
scope.
OK or NG
OK >> Replace satellite radio tuner (factory installed). Refer to
AV-46, "
Removal and Installation".
NG >> Replace audio unit. Refer to AV-46, "
Removal and Installation".
Steering Switch CheckINFOID:0000000003533680
1.AV SWITCH SELF-DIAGNOSIS FUNCTION CHECK
1. Start AV switch self-diagnosis function. Refer to AV-28, "
AV Switch Self-Diagnosis Function".
2. Operate steering switch.
Does steering switch operate normally?
YES >> Inspection End.
NO >> GO TO 2.
2.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect AV switch connector M98 and spiral cable connector M30.
3. Check continuity between spiral cable harness connector terminal and AV switch harness connector ter-
minal.
4. Check continuity between AV switch and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3.SPIRAL CABLE CHECK
1. Disconnect spiral cable connectors M30 and M102.23 - 24 : Refer to AV-28, "
Terminal
and Reference Value for Sat-
ellite Radio Tuner (Factory In-
stalled)".
WKIA4550E
Te r m i n a l s
Continuity Spiral cable AV switch
Connector Terminal Connector Terminal
M3032
M9813
Ye s 31 14
24 12
Te r m i n a l s
Continuity AV switch
—
Connector Terminal
M9812
Ground No 13
14
WKIA1600E

AV-38
< SERVICE INFORMATION >
AUDIO
2. Check continuity between spiral cable terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace spiral cable. Refer to SRS-37, "
Removal and Installation".
4.CHECK STEERING SWITCH RESISTANCE
Check resistance between steering switch terminals.
OK or NG
OK >> Inspection End.
NG >> Replace steering switch. Refer to AV-46, "
Removal and Installation".
AV Switch CheckINFOID:0000000003533681
1.AV SWITCH SELF-DIAGNOSIS FUNCTION CHECK
1. Perform AV switch self-diagnosis function. Refer to AV-28, "
AV Switch Self-Diagnosis Function".
Does AV switch operate normally?
YES >> Inspection End.
NO >> GO TO 2.
2.CHECK AV SWITCH POWER SUPPLY AND GROUND CIRCUIT
1. Check AV switch power supply and ground circuit. Refer to AV-113, "
Power Supply and Ground Circuit
Inspection for AV Switch".
OK or NG
YES >> Replace AV switch. Refer to AV-145, "Removal and Installation".
NO >> Repair malfunctioning part.
Audio Communication Line CheckINFOID:0000000003533682
1.CHECK AUDIO COMMUNICATION LINE
Start audio communication line check. Refer to AV-119, "
Audio Communication Line Check (Between Display
Control Unit and Audio Unit)".
OK or NG
OK >> Inspection End.
NG >> Replace malfunctioning part.
Te r m i n a l s
Continuity Spiral cable
Connector Terminal Connector Terminal
M3032
M10216
Ye s 31 17
24 20
WKIA4424E
Terminal Signal name ConditionResistance
(Ω)
(Approx.)
16 17Seek (down) Depress (station) down switch. 165
Power Depress power switch. 0
Volume (down) Depress volume down switch. 652
20 17Seek (up) Depress (station) up switch. 165
Mode Depress mode switch. 0
Volume (up) Depress volume up switch. 652
WKIA4457E

AUDIO
AV-39
< SERVICE INFORMATION >
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Sound Is Not Heard from Front Door Speaker or Front TweeterINFOID:0000000003533683
1.HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M113 and suspect speaker connector.
2. Check continuity between BOSE speaker amp. harness connec-
tor terminal M113 and suspect speaker harness connector ter-
minal.
3. Check continuity between BOSE speaker amp. harness connec-
tor terminal M113 and ground.
OK or NG
OK >> GO TO 2.
NG >> • Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
2.FRONT SPEAKER SIGNAL CHECK
1. Connect BOSE speaker amp. connector M113 and suspect speaker connector.
2. Turn ignition switch to ACC.
3. Push “POWER” switch.
Te r m i n a l s
Continuity BOSE speaker amp. Speaker or tweeter
Connector Terminal Connector Terminal
M11313
D12+
Ye s 14 -
15
D112+
16 -
13
M109+
14 -
15
M 111+
16 -
Te r m i n a l s
Continuity BOSE speaker amp.
—
Connector Terminal
M11313
Ground No 14
15
16
WKIA2018E

AV-40
< SERVICE INFORMATION >
AUDIO
4. Check the signal between BOSE speaker amp. harness connec-
tor M113 terminals with CONSULT-II or oscilloscope.
OK or NG
OK >> Replace suspect speaker. Refer to AV-46, "Removal
and Installation" or AV-46, "Removal and Installation".
NG >> GO TO 3.
3.HARNESS CHECK
1. Disconnect audio unit connector M43 and BOSE speaker amp. connector M113.
2. Check continuity between audio unit harness connector termi-
nals and BOSE speaker amp. harness connector terminals.
3. Check continuity between audio unit harness connector terminal
and ground.
OK or NG
OK >> GO TO 4.
NG >> • Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
4.FRONT SPEAKER SIGNAL CHECK
1. Connect audio unit connector and BOSE speaker amp. connector.
2. Turn ignition switch ACC.
Te r m i n a l s
Condi-
tionReference
signal (+) (-)
Con-
nectorTe r m i n a lCon-
nectorTe r m i n a l
M11313
M11314
Re-
ceive
audio
signal 15 16
WKIA4555E
SKIA0177E
Te r m i n a l s
Continuity Audio unit BOSE speaker amp.
Connector Terminal Connector Terminal
M431
M11329
Ye s 230
327
428
Te r m i n a l s
Continuity Audio unit
—
Connector Terminal
M431
Ground No 2
3
4
SKIA4284E