2008 INFINITI QX56 ignition

AV-98
< 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-172, "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: March 2010 2008 QX56

AV
SUBWOOFERAV-99
< 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-177,
"Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV
STEERING SWITCHAV-101
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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STEERING SWITCH
DescriptionINFOID:0000000001696137
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:0000000001696138
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-174, "
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-103
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
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MICROPHONE SIGNAL CIRCUIT
DescriptionINFOID:0000000001696139
Voice signals are transmitted from the microphone to the AV control unit using the microphone signal circuits.
Diagnosis ProcedureINFOID:0000000001696140
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-164, "
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
ALNIA0422GB
4 - Ground : Approx. 5V
WKIA5796E
Revision: March 2010 2008 QX56

AV
AV CONTROL UNITAV-105
< ECU DIAGNOSIS > [AUDIO SYSTEM]
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ECU DIAGNOSIS
AV CONTROL UNIT
Reference ValueINFOID:0000000001696141
VALUES ON THE DIAGNOSIS TOOL
CONSULT-III data monitor item
TERMINAL LAYOUT
PHYSICAL VALUES
Display Item Dis-
play Vehicle status
Remarks
VHCL SPD SIG ON Vehicle speed >0 km/h (0 MPH)
Changes in indication may be delayed. This is
normal.
OFF Vehicle speed =0 km/h (0 MPH)
PKB SIG ON Parking brake is applied.
Changes in indication may be delayed. This is
normal.
OFF Parking brake is released.
ILLUM SIG ON
Block the light beam from the auto
light optical sensor when the light
SW is ON.
—
OFF Expose the auto light optical sensor
to light when the light SW is OFF or
ON.
IGN SIG ON Ignition switch ON
—
OFF Ignition switch in ACC position
REV SIG ON Selector lever in R position
Changes in indication may be delayed. This is
normal.
OFF Selector lever in any position other
than R
ALNIA0670GB
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
1
(GR/L) Ground Amp. ON signal
OutputIgnition
switch ON —
Battery voltage
2
(LG) 3
(V) Pre-amp. audio signal front
LH
OutputIgnition
switch ON Audio output
SKIB3609E
Revision: March 2010
2008 QX56

AV-106
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AV CONTROL UNIT
4
(L) 5
(B/W) Pre-amp. audio signal rear
LH
OutputIgnition
switch ON Audio output
6
(Y) 15 Steering switch signal A Input Ignition
switch
ON Pressing switch
0V
Pressing switch 0.75
Pressing VOL up switch 2V
Except for above 5V
7
(V) Ground ACC power supply
InputIgnition
switch ACC −
Battery voltage
9
(R/L) Ground Illumination signal
Input OFFLighting switch is OFF
0V
Lighting switch is ON Battery voltage
10 — Shield — —— —
11
(BR) 12
(B/R) Pre-amp. audio signal front
RH
OutputIgnition
switch ON Audio output
13
(W) 14
(B) Audio signal rear RH Output Ignition
switch
ON Audio output
15 Ground Steering switch signal
ground —Ignition
switch
ON —0
V
16
(G) 15 Steering switch signal B Input Ignition
switch ON Pressing switch
0V
Pressing switch 0.75V
Pressing VOL down switch 2V
Except for above 5V
19
(Y) Ground Battery power supply Input Ignition
switch OFF —
Battery voltage
20
(B) Ground Ground
—Ignition
switch
ON —0
V
Terminal
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIB3609E
SKIB3609E
SKIB3609E
Revision: March 2010 2008 QX56

AV
AV CONTROL UNITAV-107
< ECU DIAGNOSIS > [AUDIO SYSTEM]
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(W) 24 RGB signal (R: red) Output Ignition
switch ON Start confirmation/adjust-
ment mode, and then dis-
play color bar by selecting
“Color Spectrum Bar” on
DISPLAY DIAGNOSIS
screen.
22
(B) 24 RGB signal (G: green) Output Ignition
switch ON Start confirmation/adjust-
ment mode, and then dis-
play color bar by selecting
“Color Spectrum Bar” on
DISPLAY DIAGNOSIS
screen.
23
(R) 24 RGB signal (B: blue) Output Ignition
switch ON Start confirmation/adjust-
ment mode, and then dis-
play color bar by selecting
“Color Spectrum Bar” on
DISPLAY DIAGNOSIS
screen.
24 Ground RGB signal ground —Ignition
switch OFF —0
V
25
(W) 26 RGB synchronizing signal Output Ignition
switch ON —
26
(G) Ground RGB synchronizing signal
ground
—Ignition
switch ON —0
V
27
(O) Ground RGB area (YS) signal Output Ignition
switch ON At RGB image displayed
5V
At rear view camera image
displayed
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIB2238J
SKIB2236J
SKIB2237J
SKIB3603E
PKIB4948J
Revision: March 2010 2008 QX56

AV-108
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AV CONTROL UNIT
28
(W/L) Ground Horizontal synchronizing
(HP) signal InputIgnition
switch ON —
29
(O/L) Ground Vertical synchronizing (VP)
signal
InputIgnition
switch On —
30
(V) Ground Communication signal
(CONT
→DISP) OutputIgnition
switch ON When adjusting display-
brightness
31
(LG) Ground
Communication signal
(DISP→CONT) InputIgnition
switch
ON When adjusting display-
brightness
32 — Shield — —— —
39
(W) 55
(B) DVD audio signal LH Input Ignition
switch ON When DVD player is oper-
ating
40
(R) 56
(G) DVD audio signal RH Input Ignition
switch
ON When DVD player is oper-
ating
45
(SB) Ground CD/DVD eject signal Input — Pressing the eject switch
0V
Except for above 3.3V
46 — Shield — —— —
Terminal
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIB3601E
SKIB3598E
PKIB5039J
PKIB5039J
SKIB3609E
SKIB3609E
Revision: March 2010 2008 QX56