2009 INFINITI QX56 turn signal

AV-100
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
BACK DOOR SPEAKER
1. Connect AV control unit connector M42 and BOSE speaker
amp. connector M113.
2. Turn ignition switch to ACC.
3. Push “POWER” switch.
4. Check the signal between AV control unit harness connector M42 terminals with CONSULT-III or oscilloscope.
Is the audio signal voltage reading as specified?
YES >> Replace BOSE speaker amp. Refer to AV-181,
"Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and
Installation".
ConnectorTe r m i n a l s
Condition Reference
signal
(+) (-)
M42 45
Receive
audio sig-
nal
13 14
ALNIA0419GB
SKIA0177E
Revision: December 20092009 QX56

AV
SUBWOOFERAV-101
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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SUBWOOFER
DescriptionINFOID:0000000003776883
The AV control unit sends audio signals to the BOSE s peaker amp. The BOSE speaker amp. amplifies the
audio signals before sending them to the subwoofer using the audio signal circuits.
Diagnosis ProcedureINFOID:0000000003776884
1.VERIFY SUBWOOFER POWER AND GROUND SUPPLY
Check power and ground supply to the subwoofer. Refer to AV-71, "
WOOFER : Diagnosis Procedure"
Did the power and ground supply check OK?
YES >> GO TO 2.
NO >> • Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
2.HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M112 and sub- woofer connector.
2. Check continuity between BOSE speaker amp. harness connec-
tor M112 (A) and M113 (B) and subwoofer harness connector
B72 (C).
3. Check continuity between BOSE speaker amp. harness connec-
tor M112 (A) and M113 (B) and ground.
Are the continuity test results as specified?
YES >> GO TO 3.
NO >> • Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
3.SUBWOOFER AMP ON SIGNAL CHECK
1. Connect BOSE speaker amp. connector M112.
2. Turn ignition switch to ACC.
3. Push “POWER” switch.
4. Check voltage between subwoofer connector B72 terminal 4 and ground.
Are the voltage test results as specified?
YES >> GO TO 4.
NO >> Replace BOSE speaker amp. Refer to AV-181, "
Removal and Installation".
Connector Terminal Connector Terminal Continuity
A: M112 9
C: B72 2
Ye s
14 1
B: M113 25 4
Connector Terminal -Continuity
A: M112 9
Ground No
14
B: M113 25
ALNIA0365GB
(+)
(-) ACC
Connector Terminal
B72 4 Ground Battery voltage
ALNIA0364GB
Revision: December 20092009 QX56

AV-102
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
SUBWOOFER
4.SUBWOOFER AUDIO SIGNAL CHECK
1. Connect BOSE speaker amp. connec tor M112 and subwoofer connector B72.
2. Turn ignition switch to ACC.
3. Push “POWER” switch.
4. Check the signal between BOSE speaker amp. harness connec- tor M112 terminals with CONS ULT-III or oscilloscope.
Is the audio signal voltage as specified?
YES >> Replace subwoofer. Refer to AV-176, "Removal and Installation".
NO >> GO TO 5.
5.HARNESS CHECK
1. Disconnect AV control unit connector M42 and BOSE speaker amp. connector M113.
2. Check continuity between AV control unit harness connector M42 (A) and BOSE speaker amp. harness connector M113 (B).
3. Check continuity between AV control unit harness connector M42 (A) and ground.
Are the continuity test results as specified?
YES >> GO TO 6.
NO >> • Check connector housings for disconnected or loose terminals. • Repair harness or connector.
6.REAR DOOR SPEAKER SIGNAL CHECK
Connector Te r m i n a l s
Condition Reference
signal
(+) (-)
M112 9 14 Receive au-
dio signal
ALNIA0366GB
SKIA0177E
AB

Continuity
Connector Terminal Connector Terminal
M42 4
M113 21
Ye s
52
2
13 23
14 33
A —Contin u it y
Connector Terminal
M42 4
Ground No
5
13
14
ALNIA0418GB
Revision: December 20092009 QX56

AV
SUBWOOFERAV-103
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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1. Connect AV control unit connector M42 and BOSE speaker amp. connector M113.
2. Turn ignition switch to ACC.
3. Push “POWER” switch.
4. Check the signal between AV control unit harness connector M42 terminals with CONSULT-III or oscilloscope.
Is the audio signal voltage reading as specified?
YES >> Replace BOSE speak er amp. Refer to AV-181,
"Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and
Installation".
ConnectorTe r m i n a l s
Condition Reference
signal
(+) (-)
M42 45
Receive
audio sig-
nal
13 14
ALNIA0419GB
SKIA0177E
Revision: December 20092009 QX56

AV-104
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
AMP ON SIGNAL CIRCUIT
AMP ON SIGNAL CIRCUIT
DescriptionINFOID:0000000003776885
When the audio system is turned on, a voltage signal is supplied from the AV control unit to the BOSE speaker
amp. When this signal is received, the BOSE speaker amp. will turn on.
Diagnosis ProcedureINFOID:0000000003776886
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)
1. Turn audio system ON.
2. Check voltage between BOSE speaker amp. harness connector M113 terminal 31 and ground.
Is battery voltage present?
YES >> Inspection End.
NO >> GO TO 2.
2.CHECK AMP ON SIGNAL (AV CONTROL UNIT)
Check voltage between AV control unit harness connector M42 ter-
minal 1 and ground.
Is battery voltage present?
YES >> Repair harness or connector.
NO >> Replace AV control unit. Refer to AV-168, "
Removal and
Installation".
31 - Ground
: Battery voltage
ALNIA0369GB
1 - Ground: Battery voltage
ALNIA0420GB
Revision: December 20092009 QX56

AV
STEERING SWITCHAV-105
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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STEERING SWITCH
DescriptionINFOID:0000000003776887
When one of the steering wheel audio control switches is pushed, the resistance in the steering wheel audio
control switch circuit changes depending on which button is pushed.
Diagnosis ProcedureINFOID:0000000003776888
1.CHECK STEERING WHEEL AUDI O CONTROL SWITCH RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect steering wheel audio control switch connector M102.
3. Check resistance between steering switch connector terminals.
Do the steering wheel audio control switches check OK?
YES >> GO TO 2.
NO >> Replace steering wheel audio control switch. Refer to AV-178, "
Removal and Installation".
2.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect AV control unit connector M42 and spiral cable con- nector M30.
3. Check continuity between AV control unit harness connector M42 (A) and spiral cable harness connector M30 (B).
4. Check continuity between AV control unit connector M42 (A) and ground.
Are the continuity results as specified?
YES >> GO TO 3.
NO >> Repair harness.
Terminal Signal name Condition Resistance
(Ω )
(Approx.)
16 17 Seek (down)
Depress switch. 165
Volume (down) Depress VOL down switch. 652
Phone/End Depress switch. 0
20 17 Seek (up)
Depress switch. 165
Volume (up) Depress VOL up switch. 652
Phone/Send Depress switch. 0
WKIA4457E
AB
Continuity
Connector Terminal Connector Terminal
M42 6
M30 24
Ye s
15 31
16 32
A —Continuity
Connector Terminal
M42 6
Ground No
15
16
ALNIA0332GB

AV
MICROPHONE SIGNAL CIRCUITAV-107
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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MICROPHONE SIGNAL CIRCUIT
DescriptionINFOID:0000000003776889
Voice signals are transmitted from the microphone to the AV control unit using the microphone signal circuits.
Diagnosis ProcedureINFOID:0000000003776890
1.CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE
1. Turn ignition switch OFF.
2. Disconnect AV control unit connector and microphone connec- tor.
3. Check continuity between AV control unit harness connector M45 (A) and microphone harness connector R109 (B).
4. Check continuity between AV control unit harness connector M45 (A) and ground.
Are the continuity test results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK MICROPHONE POWER SUPPLY
1. Connect AV control unit connector and microphone connector.
2. Turn ignition switch ON.
3. Check voltage between microphone harness connector R109 terminal 4 and ground.
Is voltage reading approx. 5 volts?
YES >> GO TO 3.
NO >> Replace AV control unit. Refer to AV-168, "
Removal and
Installation".
3.CHECK MICROPHONE SIGNAL
AB
Continuity
Connector Terminal Connector Terminal
M45 72
R109 1
Ye s
71 2
70 4
A —Continuity
Connector Terminal
M45 70
GroundNo
71
72
AWLIA1603ZZ
4 - Ground : Approx. 5V
WKIA5796E
Revision: December 20092009 QX56

AV
NORMAL OPERATING CONDITIONAV-157
< SYMPTOM DIAGNOSIS > [AUDIO SYSTEM]
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000003776899
AUDIO SYSTEM
The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference,
etc.).
Noise
The following noise results from variations in field strength, such as fading noise and multi-path noise, or
external noise from trains and other sources. It is not a malfunction.
• Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
• Multi-path noise: This noise results from the waves sent directly from the broadcast station arriving at the antenna at a different time from the waves which reflect off mountains or buildings.
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
NAVIGATION SYSTEM
Basic Operation
Vehicle Mark
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
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 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
Symptom
Cause Remedy
No image is shown. Display brightness adjustment is set fully to DARK
side. Adjust the display brightness.
No guide sound is heard.
Audio guide volume is too low or
too high. Volume control is set to OFF, MIN or MAX. Adjust the audio guide volume.
Audio guidance is not available while the vehicle is
driving on a dark pink route.
System is not malfunctioning.
Screen is too dark.
Motion of the image is too slow. Temperature inside the vehicle is low.
Wait until the temperature inside the vehicle
reaches the proper temperature.
Small black or bright spots appear
on the screen. Symptom peculiar to a liquid crystal display (dis-
play unit). System is not malfunction.
Revision: December 20092009 QX56