2007 INFINITI QX56 rear door

ATC-160
< SERVICE INFORMATION >
REFRIGERANT LINES
8. Remove the rear high- and low-pressure pipes bracket bolt (A)to release the bracket.
• Rear blower motor (1)
•⇐ : Front
9. Remove the rear high- and low-pressure pipes bolt (A) to dis- connect the rear high- and low-pressure pipes from the rear
expansion valve (1).
•⇐ : Front
CAUTION:
Cap or wrap the joint of the pipes with suitable material
such as vinyl tape to avoid the entry of air.
10. Disconnect the following electrical connectors: • Rear air mix door motor (1)
• Rear blower motor resistor (2)
• Rear blower motor (3)
•⇐ : Front
11. Disconnect the ducts from the rear heater and cooling unit assembly. Refer to ATC-145, "
Component".
12. Remove the rear heater and cooling unit assembly. CAUTION:
Cap or wrap the joint of the pipes with suitable material such as viny l tape to avoid the entry of air.
13. Remove the rear high- and low-pressure A/C pipes.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-152, "
Component".
CAUTION:
• Replace the O-ring of th e high/low-pressure pipe with a new one, then apply compressor oil to it
when installing it.
• After charging refrigerant, check for leaks.
Removal and Installati on for Underfloor Rear High- and Low-Pressure A/C and Heater
Core Pipes
INFOID:0000000003533300
REMOVAL
1. Drain the coolant from the engine cooling system. Refer to CO-9, "Changing Engine Coolant".
2. Disconnect the battery negative terminal.
3. Disconnect the generator harness.
4. Discharge the refrigerant. Refer to ATC-150, "
HFC-134a (R-134a) Service Procedure".
WJIA2312E
WJIA2313E
WJIA2314E

REFRIGERANT LINESATC-165
< SERVICE INFORMATION >
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3. Remove the rear blower speed resistor.
4. Remove the rear air mix door motor.
5. Remove the rear duct and blend door assembly. Refer to AT C -
148, "Removal and Installation".
6. Disassemble the rear heater and cooling unit assembly to remove the evaporator.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-rings on the rear A/C pipes with ne w ones. Apply compressor oil to the O-rings when
installing them.
• After charging refrigerant, check for leaks.
Removal and Installation for Front Expansion ValveINFOID:0000000003533305
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the front evaporator. Refer to ATC-163, "
Removal and Installation for Front Evaporator".
3. Remove the cooler grommet.
4. Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-rings on the A/C re frigerant pipes with new ones, then apply compressor oil to them
when installing them.
• After charging refrigerant, check for leaks.
Removal and Installation for Rear Expansion ValveINFOID:0000000003533306
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the luggage side lower finisher RH. Refer to EI-39
.
3. Disconnect the A/C refrigerant pi pes from the expansion valve.
CAUTION:
Cap or wrap the A/C refrigerant pipe ends with a suitable material such as vinyl tape to avoid the
entry of air and contaminants.
4. Remove the expansion valve.
LJIA0021E
WJIA0582E
Expansion valve bolts : 4 N·m (0.41 kg-m, 35 in-lb)
A/C refrigerant pipe to expansion valve bolt : Refer to ATC-152, "
Component".

AV-1
ELECTRICAL
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SECTION AV
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CONTENTS
AUDIO, VISUAL, NAVIGATION & TELEPHONE SYS-
TEM
SERVICE INFORMATION ............................3
PRECAUTIONS ...................................................3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
3
PREPARATION ...................................................4
Commercial Service Tool ..........................................4
AUDIO .................................................................5
Component Parts and Harness Connector Loca-
tion ............................................................................
5
System Description ...................................................6
Schematic .................................................................8
Wiring Diagram - AUDIO - .........................................9
Terminal and Reference Value for Audio Unit .........20
Terminal and Reference Value for BOSE Speaker
Amp .........................................................................
23
Terminal and Reference Value for Rear Audio Re-
mote Control Unit ....................................................
25
Terminal and Reference Value for AV Switch .........26
Terminal and Reference Value for Satellite Radio
Tuner (Factory Installed) .........................................
28
AV Switch Self-Diagnosis Function .........................28
Trouble Diagnosis ...................................................29
Noise Inspection ......................................................31
Power Supply Circuit Inspection .............................31
Satellite Radio Tuner (Factory Installed) Power
and Ground Supply Circuit Inspection .....................
32
Satellite Radio Tuner (Factory Installed) Commu-
nication Circuit Inspection .......................................
33
Satellite Radio Tuner (Factory Installed) Left
Channel Audio Signal Circuit Inspection .................
35
Satellite Radio Tuner (Factory Installed) Right
Channel Audio Signal Circuit Inspection .................
36
Steering Switch Check ............................................37
AV Switch Check .....................................................38
Audio Communication Line Check ..........................38
Sound Is Not Heard from Front Door Speaker or
Front Tweeter ..........................................................
39
Sound Is Not Heard from Rear Door Speaker or
Rear Door Tweeter ..................................................
41
Sound Is Not Heard from Center Speaker ...............44
Sound Is Not Heard from Subwoofer .......................44
Removal and Installation .........................................46
AUDIO ANTENNA .............................................52
System Description ..................................................52
Wiring Diagram - W/ANT - .......................................53
Location of Antenna .................................................54
Window Antenna Repair ..........................................54
TELEPHONE .....................................................56
Component Parts and Harness Connector Loca-
tion ...........................................................................
56
System Description ..................................................56
Wiring Diagram - H/PHONE - ..................................58
Terminal and Reference Value for Bluetooth Con-
trol Unit ....................................................................
60
Bluetooth Control Unit Self-Diagnosis Function ......60
Power Supply and Ground Circuit Inspection for
Bluetooth Control Unit .............................................
61
Removal and Installation .........................................62
DVD ENTERTAINMENT SYSTEM ....................64
Component Parts and Harness Connector Loca-
tion ...........................................................................
64
Description ...............................................................64
Schematic ................................................................66
Wiring Diagram - DVD - ...........................................67
Trouble Diagnosis ....................................................70
Power Supply Circuit Inspection ..............................70
Removal and Installation .........................................71
NAVIGATION SYSTEM ....................................73
System Description ..................................................73
CAN Communication System Description ...............75
Component Parts Location ......................................76
Schematic ................................................................77
Wiring Diagram - NAVI - ..........................................78
Schematic ................................................................85

AV-6
< SERVICE INFORMATION >
AUDIO
System Description
INFOID:0000000003533664
Refer to Owner's Manual for audio system operating instructions.
Power is supplied at all times
• through 15A fuse [No. 17, located in the fuse block (J/B)]
• to subwoofer terminal 6
• through 20A fuse [No. 31, located in the fuse and fusible link box]
• to audio unit terminal 6
• to BOSE speaker amp. terminal 1
• to AV switch terminal 1 and
• to display control unit terminal 1.
With the ignition switch in the ACC or ON position, power is supplied
• through 10A fuse [No. 4, located in the fuse block (J/B)]
• to audio unit terminal 10 and
• to AV switch terminal 2 and
• to display control unit terminal 10.
With the ignition switch in the ON or START position, power is supplied
• through 10A fuse [No. 12, located in the fuse block (J/B)]
• to display control unit terminal 12.
Ground is supplied through the case of the audio unit.
Ground is also supplied
• to subwoofer terminal 5
• through body grounds B7 and B19 and
• to BOSE speaker amp. terminal 17
• to AV switch terminal 5 and
• to display unit terminal 1 and
• to display control unit terminal 3
• through body grounds M57, M61 and M79.
Then audio signals are supplied
• through audio unit terminals 1, 2, 3, 4, 13, 14, 15 and 16
• to BOSE speaker amp. terminals 23, 24, 25, 26, 27, 28, 29 and 30.
Audio signals are amplified by the BOSE speaker amp.
The amplified audio signals are supplied
• through BOSE speaker amp. terminals 2, 3, 9,10,11,12, 13, 14, 15, 16, 18 and 19
• to terminals + and - of front door speaker LH and RH and
• to terminals + and - of front tweeter LH and RH and
• to terminals + and - of center speaker and
• to terminals + and - of rear door speaker LH and RH and
• to terminals + and - of rear door tweeter LH and RH and
• to terminals 1 and 2 of subwoofer.
When one of steering wheel audio control switches is pushed, the resistance in steering switch circuit changes
depending on which button is pushed.
Rear Audio Remote Control Unit
Power is supplied
• from audio unit terminal 32
• to rear audio remote control unit terminal 13.
Ground is supplied
• to rear audio remote control unit terminal 15
7. Display control unit
M94, M958. Front tweeter RH
M 1119. AV Switch
M98
10. Audio unit
M43, M44, M45, M4611. BOSE speaker amp
M112, M11312. Satellite radio tuner (pre-wiring or factory
installed, if equipped)
M41
13. Steering wheel audio control switches 14. Front door speaker LH, RH
D12, D11215. Rear door tweeter LH, RH
D208, D308
16. Rear door speaker LH, RH
D207, D30717. Driver seat 18. Subwoofer
B72
19. Rear audio remote control unit
R204

AV-20
< SERVICE INFORMATION >
AUDIO
Terminal and Reference Value for Audio Unit
INFOID:0000000003533667
Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of symptom
+–Ignition
switchOperation
2 (W) 1 (B)Audio sound
signal front
LHOutput ONReceive audio
signalNo sound from front
door speaker LH or
tweeter LH.
4 (Y) 3 (BR)Audio sound
signal front
RHOutput ONReceive audio
signalNo sound from front
door speaker RH or
tweeter RH.
5 (G/W) GroundAntenna
signalOutput ON – More than 10V Poor radio reception.
6 (Y) GroundBattery pow-
erInput – – Battery voltageSystem does not
work properly.
7 (BR) GroundIllumination
control sig-
nalInput ONIllumination con-
trol switch is op-
erated by lighting
switch in 1st posi-
tion.Changes between 0 and 12VAudio unit illumina-
tion cannot be con-
trolled.
8 (R/L) GroundIllumination
signalInput OFFLighting switch is
in 1st position.Battery voltageAudio unit illumina-
tion does not come
on when lighting
switch is in 1st posi-
tion. Lighting switch is
OFF.3V or less
9–Shield –– – 0VInterference and dis-
tortion heard from
speakers.
10 (V) Ground ACC signal Input ON – Battery voltageSystem does not
work properly.
12 (G/W) GroundAmp. ON
signalOutput ON – More than 6.5VAmp. does not work
properly.
14 (BR) 13 (B/R)Audio sound
signal rear
LHOutput ONReceive audio
signalNo sound from rear
door speaker LH or
rear door tweeter LH.
SKIA0177E
SKIA0177E
SKIA0177E

AUDIO
AV-21
< SERVICE INFORMATION >
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16 (L) 15 (B/W)Audio sound
signal rear
RHOutput ONReceive audio
signalNo sound from rear
door speaker RH or
rear door tweeter
RH.
21 (V) GroundRemote
control AOutput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
22 (P) GroundRemote
control BOutput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
23 (BR/Y) GroundRemote
control COutput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
24 (L) GroundRemote
control DOutput ON Audio unit ON 5VRear audio remote
control unit does not
operate properly.
25 (LG) –Remote
control
ground–– – 0VRear audio remote
control switches do
not function.
27 (O/L) 26 (O)Audio sound
signal LHOutput ONReceive audio
signalNo sound from LH
headphone channel.
29 (W) 28 (W/L)Audio sound
signal RHOutput ONReceive audio
signalNo sound from RH
headphone channel.
30 – Shield – – – 0VInterference and dis-
tortion heard from
headphones or rear
audio remote control
unit switches not op-
erating properly.
31 (O) GroundRemote
control en-
able signalOutput ON Audio unit ON 5VRear audio remote
control unit does not
operate.
32 (V) GroundRemote
control
switch pow-
er supplyOutput ON Audio unit ON 12VRear audio remote
control unit does not
operate. Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of symptom
+–Ignition
switchOperation
SKIA0177E
SKIA0177E
SKIA0177E

AUDIO
AV-23
< SERVICE INFORMATION >
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Terminal and Reference Value for BOSE Speaker AmpINFOID:0000000003533668
66 (W/L) Ground Audio TX Output ONOperate audio
volume Audio does not oper-
ate properly.
67 – Shield – ON – 0VInterference and dis-
tortion heard from
speakers.
70 – Shield – – – 0VInterference and dis-
tortion heard from
speakers.
71 (B) 69 (W)Voice guide
signalOutput ONPress the
"GUIDE/VOICE"
button.Only route guide and
operation guide are
not heard.
72 (W/B) GroundCD eject sig-
nalInput ONOperate EJECT
button0V→5VCD will not eject from
audio unit.
73 (Y/B) GroundCD load sig-
nalInput ONOperate LOAD
button0V→5VCD will not load into
audio unit. Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of symptom
+–Ignition
switchOperation
SKIA4402E
SKIA0171J
Te r m i n a l
(wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of
symptom
+–Ignition
switchOperation
1 (Y) Ground Battery Input – – Battery voltageSystem does not
work properly.
9 (SB) 10 (B/Y)Rear door
speaker LH
and rear door
tweeter LHOutput ONReceive audio
signalNo sound from rear
door speaker LH or
rear door tweeter
LH.
11 (O/L) 12 (R/L)Rear door
speaker RH
and rear door
tweeter RHOutput ONReceive audio
signalNo sound from rear
door speaker RH
or rear door tweet-
er RH.
SKIA0177E
SKIA0177E

AV-24
< SERVICE INFORMATION >
AUDIO
13 (L/W) 14 (L/R)Front door
speaker LH
and front
tweeter LHOutput ONReceive audio
signalNo sound from
front door speaker
LH or front tweeter
LH.
15 (W/B) 16 (L/B)Front door
speaker RH
and front
tweeter RHOutput ONReceive audio
signalNo sound from
front door speaker
RH or front tweeter
RH.
17 (B) Ground Ground – ON – – –
18 (V) 2 (R)Center speak-
erOutput ONReceive audio
signalNo sound from
center speaker.
19 (W) 3 (B) Subwoofer Output ONReceive audio
signalNo sound from
subwoofer.
22
(W/G)GroundSubwoofer ON
signalInput ON – More than 6.5VSubwoofer does
not work properly.
24 (L) 23 (B/W)Audio sound
signal rear RHInput ONReceive audio
signalNo sound from rear
door speaker RH
or rear door tweet-
er RH.
26 (BR) 25 (B/R)Audio sound
signal rear LHInput ONReceive audio
signalNo sound from rear
door speaker LH or
rear door tweeter
LH. Te r m i n a l
(wire color)
ItemSignal
input/
outputCondition
Reference value
(Approx.)Example of
symptom
+–Ignition
switchOperation
SKIA0177E
SKIA0177E
SKIA0177E
SKIA0177E
SKIA0177E
SKIA0177E