INFINITI QX56 2006 Factory Service Manual

AV-28
AUDIO
Revision: November 20092006 QX56
Terminals and Reference Value for Rear Audio Remote Control UnitEKS00BID
Terminal
(Wire color) ItemSignal
input/
output Condition
Reference value
(Approx.) Example of symptom
+ – Ignition
switch Operation
2 (G) 1 (B) Audio sound
signal LHInput ON Receive audio
signal No sound from LH
headphone channel.
4 (W) 3 (R) Audio sound
signal RHInput ON
Receive audio
signal No sound from RH
headphone channel.
5 –Shield –– – 0VInterference and dis-
tortion heard from
headphones or rear
audio remote control
unit switches not
operating properly.
6 (R/L) Ground Illumination Input ON Lighting switch
ON
12V
Rear audio remote
control unit does not
illuminate.
Lighting switch
OFF 0V
7 (LG) –Remote
control
ground
–– –
0VRear audio remote
control unit switches
do not function.
8 (O) Ground Remote
control
enable sig-
nalInput ON Audio unit ON
5VRear audio remote
control unit does not
operate.
9 (V) Ground Remote
control AInput ON Audio unit ON
5VRear audio remote
control unit does not
operate properly.
10 (P) Ground Remote
control BInput ON Audio unit ON
5VRear audio remote
control unit does not
operate properly.
11
(BR/Y) GroundRemote
control C
Input ON Audio unit ON
5VRear audio remote
control unit does not
operate properly.
12 (L) Ground Remote
control DInput ON Audio unit ON
5VRear audio remote
control unit does not
operate properly.
13 (V) Ground Remote
control
switch
power sup-
plyInput ON Audio unit ON
12VRear audio remote
control does not
operate.
15 (B) –Ground –ON – 0V –
SKIA0177E
SKIA0177E

AUDIOAV-29
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AV
Revision: November 2009 2006 QX56
Terminals and Reference Value for AV SwitchEKS00BIE
Terminal No.
(Wire color) ItemSignal
input/
output Condition
Vo l ta g e
(Approx.) Example of
symptom
+ – Ignition
switch Operation
1 (Y) Ground Battery
power Input OFF
–Battery voltage System does not
work properly.
2 (V) Ground ACC signal Input ACC –Battery voltage System does not
work properly.
3 (R/L) Ground Illumination
signal Input OFF Lighting 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) Ground Illumination
control signal Input ON Illumination 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) Ground Communica-
tion signal (+) Input/
output ON
– System does not
work properly.
7 –Shield
ground –– –
–
8 (LG) Ground Communica-
tion signal (-) Input/
output ON
– System does not
work properly.
12 (R) Ground Remote con-
trol A Input ON Press MODE
switch 0V
Steering wheel
audio controls
do not function.
Press SEEK UP
switch 0.75V
Press VOL UP switch 2V
Except for above 5V
13 (G) Ground Remote con-
trol B Input ON Press POWER
switch 0V
Steering wheel
audio controls
do not function.
Press SEEK
DOWN switch 0.75V
Press VOL DOWN switch 2V
Except for above 5V
14 (L) –Remote con-
trol ground –– –
–Steering wheel
audio controls
do not function.
16 (W/B) Ground CD EJECT
signal Output ON Pressed
0V
CD eject does
not function.
Released 5V
SKIA0175E
SKIA0176E

AV-30
AUDIO
Revision: November 20092006 QX56
Terminals and Reference Value for Satellite Radio Tuner (Factory Installed)EKS00GB2
17 (Y/B) GroundCD LOAD
signal Output ON Pressed
0V
CD load does
not function.
Released 5V
Terminal No.
(Wire color) ItemSignal
input/
output Condition
Voltage
(Approx.) Example of
symptom
+ – Ignition
switch Operation
Te r m i n a l
(Wire color) ItemSignal
input/
output Condition
Voltage
(approx.)
+ – Ignition
switch Operation
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 ONApprox. 0 V
28 (L) Ground REQ1
(SAT-AUDIO) Output ON
Set to the satellite radio
mode
29 (O/L) Ground Communication signal
(SAT-AUDIO)
Output ONSet to the satellite radio
mode
30 (W/L) Ground Communication 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

AUDIOAV-31
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AV
Revision: November 2009 2006 QX56
AV Switch Self-Diagnosis FunctionEKS00BIF
It can check ON/OFF operation of each switch in the AV switch and diagnose the input signals from the steer-
ing switch.
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.
WKIA4455E

AV-32
AUDIO
Revision: November 20092006 QX56
Trouble DiagnosisEKS00BIG
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-
155, "Unable to Operate All of AV Switches (Unable to Start Self-Diagnosis)" .
FOR RADIO ONLY
SymptomPossible cause
Inoperative

Audio unit power circuit check. Refer to AV- 3 5 , "Power Supply Circuit
Inspection" .

Audio communication line check. Refer to AV-136, "Audio Communication
Line Check (Between Display Control Unit and Audio Unit)" .

AV switch check. Refer to AV- 4 3 , "AV Switch Check" .
If above check is OK, replace audio unit.
Steering switch does not operate

Steering switch check. Refer to AV-41, "Steering Switch Check" .

AV switch check. Refer to AV- 4 3 , "AV Switch Check" .
If above check is OK, replace audio unit.
Audio information is not displayed on screen

Display unit check. Refer to AV- 11 2 , "Self-Diagnosis Mode (DCU)" .
All speakers do not sound

Audio unit

BOSE speaker amp. power supply and ground circuit check. Refer to AV- 3 5 ,
"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-44, "Sound Is Not Heard From Front
Door Speaker or Front Tweeter" .

Rear door speaker check. Refer to AV- 4 8 , "Sound Is Not Heard From Rear
Door Speaker or Rear Door Tweeter" .

Subwoofer check. Refer to AV- 5 2 , "Sound Is Not Heard From Subwoofer" .

Center speaker check. Refer to AV- 5 1 , "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.)
Symptom Possible cause
No sound

Audio unit

Antenna feeder, wiring or connections

Antenna amplifier, power supply, wiring or connections
Noisy

Audio unit

Audio unit case ground

Antenna feeder, wiring or connections

Antenna amplifier, power supply, wiring or connections

Noise prevention parts

Each electrical equipment

Wire harness of each piece of electrical equipment
All radio stations stored in memory are deleted

Audio unit power circuit check. Refer to AV-35, "Power Supply Cir-
cuit Inspection" .

Audio unit

AUDIOAV-33
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AV
Revision: November 2009 2006 QX56
NOTE:
1. 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.
FOR CD ONLY
FOR SATELLITE RADIO TUNER (FACTORY INSTALLED) ONLY
NOTE:
Pressing the SAT button, the display unit will display `NO SAT' when the following conditions exist:

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 InspectionEKS00BIH
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
Symptom Possible cause
CD cannot be inserted.

CD

Audio unit
CD cannot be ejected.
The CD cannot be played.
The sound skips, stops suddenly, or is distorted.
Symptom
Possible cause
Inoperative

Satellite radio tuner (factory installed) power and ground circuit inspection.
Refer to AV- 3 7 , "
Satellite Radio Tuner (Factory Installed) Power and Ground
Supply Circuit Inspection" .

Satellite radio tuner (factory installed) communication circuit inspection.
Refer to AV- 3 8 , "
Satellite Radio Tuner (Factory Installed) Communication
Circuit Inspection" .
If above check is OK, replace satellite radio tuner (factory installed). Refer
to AV- 5 8 , "
SATELLITE RADIO TUNER" .
Right or left channel does not sound

Satellite radio tuner (factory installed) right channel audio signal circuit
inspection. Refer to AV-41, "
Satellite Radio Tuner (Factory Installed) Right
Channel Audio Signal Circuit Inspection" .

Satellite radio tuner (factory installed) left channel audio signal circuit
inspection. Refer toAV- 4 0 , "
Satellite Radio Tuner (Factory Installed) Left
Channel Audio Signal Circuit Inspection" .
If above check is OK, replace satellite radio tuner (factory installed). Refer to
AV- 5 8 , "
SATELLITE RADIO TUNER" .
Poor reception

Location of vehicle. Make certain vehicle is in an open area.

Satellite radio antenna or antenna feeder. Refer to AV- 6 2 , "Location of
Antenna" .
Noisy

Satellite radio tuner (factory installed) ground.

Satellite radio tuner (factory installed) harness shield wires.

Electrical equipment (generator, bonding wire, etc.). Refer to AV-33, "Noise
Inspection" .

AV-34
AUDIO
Revision: November 20092006 QX56
Occurrence conditionPossible 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
operation 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
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

AUDIOAV-35
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AV
Revision: November 2009 2006 QX56
Power Supply Circuit InspectionEKS00BII
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 problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
UnitTerminals Signal name Fuse No.
Audio unit 6
Battery power 31
10 Ignition switch ACC or ON 4
AV switch 1
Battery power 31
2 Ignition switch ACC or ON 4
BOSE speaker amp. 1Battery power 31
Subwoofer 6Battery power 17

AV-36
AUDIO
Revision: November 20092006 QX56
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.
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.
Unit Terminal No.
OFF ACC ON
(+)
(-)
Connector Terminal
Audio unit M43 6Ground
Battery
voltage Battery
voltage Battery
voltage
10 Ground 0 V Battery
voltage Battery
voltage
SKIA1992E
Unit Terminal No.
OFF ACC ON
(+)
(-)
Connector Terminal
Sub-
woofer B72 6 Ground Battery
voltage Battery
voltage Battery
voltage
WKIA1598E
Unit Terminal No.
OFF ACC ON
(+)
(-)
Connector Terminal
BOSE
speaker
amp. M112 1 Ground
Battery
voltage Battery
voltage Battery
voltage
SKIA4311E
Continuity should exist.
WKIA1599E

AUDIOAV-37
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AV
Revision: November 2009 2006 QX56
Satellite Radio Tuner (Factory Installed) Power and Ground Supply Circuit
Inspection
EKS00GB3
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 problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
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.
Unit Terminals Signal name Fuse No.
Satellite radio tuner (factory
installed) 32
Battery power 31
36 Ignition switch ACC or ON 6
UnitTerminal No.
OFF ACC ON
(+)
(-)
Connector Terminal
Satellite
radio tuner
(factory
installed) M41
32 Ground
Battery
voltage Battery
voltage Battery
voltage
36 Ground 0V Battery
voltage Battery
voltage
WKIA4539E
Terminals
Continuity
Satellite radio tuner (factory
installed) Audio unit
Connector Terminal Connector Terminal
A: M41 25
B: M42 45
Ye s
26 46
WKIA4540E