2007 INFINITI QX56 ignition

AUDIO
AV-25
< SERVICE INFORMATION >
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Terminal and Reference Value for Rear Audio Remote Control UnitINFOID:0000000003533669
28 (Y) 27 (BR)Audio sound
signal front RHInput ONReceive audio
signalNo sound from
front door speaker
RH or front tweeter
RH.
30 (W) 29 (B)Audio sound
signal front LHInput ONReceive audio
signalNo sound from
front door speaker
LH or front tweeter
LH.
31 (G/W) GroundAmp. ON sig-
nalInput ON – More than 6.5VSystem does not
work properly. Te r m i n a l
(wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of
symptom
+–Ignition
switchOperation
SKIA0177E
SKIA0177E
Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of symptom
+–Ignition
switchOperation
2 (G) 1 (B)Audio sound
signal LHInput ONReceive audio
signalNo sound from LH
headphone channel.
4 (W) 3 (R)Audio sound
signal RHInput ONReceive audio
signalNo sound from RH
headphone channel.
5 – Shield – – – 0VInterference and dis-
tortion heard from
headphones or rear
audio remote control
unit switches not op-
erating properly.
6 (R/L) Ground Illumination Input ONLighting switch
ON12V
Rear audio remote
control unit does not
illuminate. Lighting switch
OFF0V
7 (LG) –Remote
control
ground–– – 0VRear audio remote
control unit switches
do not function.
SKIA0177E
SKIA0177E

AV-26
< SERVICE INFORMATION >
AUDIO
Terminal and Reference Value for AV Switch
INFOID:0000000003533670
8 (O) GroundRemote
control en-
able signalInput ON Audio unit ON 5VRear audio remote
control unit does not
operate.
9 (V) GroundRemote
control AInput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
10 (P) GroundRemote
control BInput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
11
(BR/Y)GroundRemote
control CInput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
12 (L) GroundRemote
control DInput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
13 (V) GroundRemote
control
switch pow-
er supplyInput ON Audio unit ON 12VRear audio remote
control does not op-
erate.
15 (B) – Ground – ON – 0V –Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of symptom
+–Ignition
switchOperation
Te r m i n a l N o .
(Wire color)
ItemSignal
input/
outputCondition
Vo l ta g e
(Approx.)Example of
symptom
+–Ignition
switchOperation
1 (Y) Ground Battery power Input OFF – Battery voltageSystem does not
work properly.
2 (V) Ground ACC signal Input ACC – Battery voltageSystem does not
work properly.
3 (R/L) GroundIllumination
signalInput OFFLighting switch is
ON (position 1).Battery voltageAV switch illumi-
nation does not
come on when
lighting switch is
ON (position 1). Turn lighting switch
OFF.Approx. 3.0V or less
4 (BR) GroundIllumination
control signalInput ONIllumination control
switch is operated
by lighting switch in
1st position.Changes between 0 and 12V.AV switch illumi-
nation cannot be
controlled.
5 (B) Ground Ground – ON – 0V –
6 (V) GroundCommunica-
tion signal (+)Input/
outputON –System does not
work properly.
7 – Shield ground – – – –
SKIA0175E

AUDIO
AV-27
< SERVICE INFORMATION >
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8 (LG) GroundCommunica-
tion signal (-)Input/
outputON –System does not
work properly.
12 (R) GroundRemote con-
trol AInput ONPress MODE
switch 0V
Steering wheel
audio controls
do not function. Press SEEK UP
switch0.75V
Press VOL UP
switch2V
Except for above 5V
13 (G) GroundRemote con-
trol BInput ONPress POWER
switch 0V
Steering wheel
audio controls
do not function. Press SEEK
DOWN switch0.75V
Press VOL DOWN
switch2V
Except for above 5V
14 (L) –Remote con-
trol ground–– – –Steering wheel
audio controls
do not function.
16 (W/B) GroundCD EJECT
signalOutput ONPressed 0V
CD eject does
not function.
Released 5V
17 (Y/B) GroundCD LOAD
signalOutput ONPressed 0V
CD load does
not function.
Released 5V Terminal No.
(Wire color)
ItemSignal
input/
outputCondition
Vol tag e
(Approx.)Example of
symptom
+–Ignition
switchOperation
SKIA0176E

AV-28
< SERVICE INFORMATION >
AUDIO
Terminal and Reference Value for Satellite Radio Tuner (Factory Installed)
INFOID:0000000003533671
AV Switch Self-Diagnosis FunctionINFOID:0000000003533672
It can check ON/OFF operation of each switch in the AV switch and diagnose the input signals from the steer-
ing switch.
Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Vol tag e
(approx.)
+–Ignition
switchOperation
22 (R) 21 (G) Audio signal LH Output ON Receive audio signal.
24 (W) 23 (B) Audio signal RH Output ON Receive audio signal.
25
– Shield ––
––
26 ON Approx. 0 V
28 (L) GroundREQ1
(SAT-AUDIO)Output ONSet to the satellite radio
mode
29 (O/L) GroundCommunication signal
(SAT-AUDIO)Output ONSet to the satellite radio
mode
30 (W/L) GroundCommunication signal
(AUDIO-SAT)Input ONSet to the satellite radio
mode
32 (Y)
GroundBattery power supply
InputOFF
−Battery voltage
36 (V) ACC power supply ACC
37 – Antenna signal – – –
SKIB3609E
SKIB3609E
SKIB3825E
SKIB3824E
SKIB3826E

AUDIO
AV-29
< SERVICE INFORMATION >
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STARTING THE SELF-DIAGNOSIS MODE
1. Turn ignition switch from OFF to ACC.
2. Within 10 seconds press and hold the switches “MEMORY 1”
and “MEMORY 6” simultaneously for 3 seconds.
Then the self-diagnosis operates. A single beep indicates self-
diagnosis mode is active.
3. Press each switch and listen for beep.
NOTE:
CD player LOAD and EJECT buttons are not included in this test
and will not beep when pressed.
EXITING THE SELF-DIAGNOSIS MODE
Turn ignition switch OFF. Then the self-diagnosis ends.
DIAGNOSIS FUNCTION
• It can check for continuity of the switches by sounding the beep when each AV switch and steering switch is
pressed.
• It can check for continuity of harness between AV switch and steering switch.
Trouble DiagnosisINFOID:0000000003533673
The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference,
etc.). Check the inspection items below to diagnose the malfunction.
MALFUNCTION WITH RADIO AND CD
Before proceeding, confirm that other AV switch functions (except audio functions) operate. If not, refer to AV-
134, "Unable to Operate All of AV Switches (Unable to Start Self-Diagnosis)".
WKIA4455E
Symptom Possible cause
Inoperative• Audio unit power circuit check. Refer to AV- 3 1 , "
Power Supply Circuit Inspec-
tion".
• Audio communication line check. Refer to AV- 3 8 , "
Audio Communication
Line Check".
• AV switch check. Refer to AV- 3 8 , "
AV S w i t c h C h e c k".
If above check is OK, replace audio unit. Refer to AV- 4 6 , "
Removal and Instal-
lation".
Steering switch does not operate• Steering switch check. Refer to AV- 3 7 , "
Steering Switch Check".
• AV switch check. Refer to AV- 3 8 , "
AV S w i t c h C h e c k".
If above check is OK, replace audio unit. Refer to AV- 4 6 , "
Removal and Instal-
lation".
Audio information is not displayed on screen • Display unit check. Refer to AV- 9 8 , "
Self-Diagnosis Mode (DCU)".
All speakers do not sound• Audio unit
• BOSE speaker amp. power supply and ground circuit check. Refer to AV- 3 1 ,
"Power Supply Circuit Inspection".
• BOSE speaker amp. ON signal
• BOSE speaker amp.
One or several speakers do not sound• Front door speaker check. Refer to AV- 3 9 , "
Sound Is Not Heard from Front
Door Speaker or Front Tweeter".
• Rear door speaker check. Refer to AV- 4 1 , "
Sound Is Not Heard from Rear
Door Speaker or Rear Door Tweeter".
• Subwoofer check. Refer to AV- 4 4 , "
Sound Is Not Heard from Subwoofer".
• Center speaker check. Refer to AV- 4 4 , "
Sound Is Not Heard from Center
Speaker".
Poor sound• Audio unit
• BOSE speaker amp.
• Speaker
Noisy• Audio unit
• BOSE speaker amp.
• Electrical equipment (generator, bonding wire, etc.)

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

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