2010 INFINITI QX56 wiring

AV-102
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
SUBWOOFER
SUBWOOFER
DescriptionINFOID:0000000005146337
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:0000000005146338
Regarding Wiring Diagram information, refer to AV-116, "Wiring Diagram".
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
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
Revision: April 20092010 QX56

AV
AMP ON SIGNAL CIRCUITAV-105
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
C
D
E
F
G H
I
J
K L
M B A
O P
AMP ON SIGNAL CIRCUIT
DescriptionINFOID:0000000005146339
When the audio system is turned on, a voltage signal is s upplied from the AV control unit to the BOSE speaker
amp. When this signal is received, t he BOSE speaker amp. will turn on.
Diagnosis ProcedureINFOID:0000000005146340
Regarding Wiring Diagram information, refer to AV-116, "Wiring Diagram".
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-169, "
Removal and
Installation".
31 - Ground
: Battery voltage
ALNIA0369GB
1 - Ground: Battery voltage
ALNIA0420GB
Revision: April 20092010 QX56

AV-106
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
STEERING SWITCH
STEERING SWITCH
DescriptionINFOID:0000000005146341
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:0000000005146342
Regarding Wiring Diagram information, refer to AV-116, "Wiring Diagram".
1.CHECK STEERING WHEEL AUDIO 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-179, "
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 c ontrol unit connector M42 (A) and ground.
Terminal Signal name ConditionResistance
(Ω)
(Approx.)
16 17 Seek (down)
Depress switch. 165
Volume (down) Depress VOL down switch. 487
Phone/Send Depress switch. 0
20 17 Seek (up)
Depress switch. 165
Volume (up) Depress VOL up switch. 487
Mode/End 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
Revision: April 20092010 QX56

AV-108
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
MICROPHONE SIGNAL CIRCUIT
MICROPHONE SIGNAL CIRCUIT
DescriptionINFOID:0000000005146343
Voice signals are transmitted from the microphone to the
AV control unit using the microphone signal circuits.
Diagnosis ProcedureINFOID:0000000005146344
Regarding Wiring Diagram information, refer to AV-116, "Wiring Diagram".
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-169, "
Removal and
Installation".
3.CHECK MICROPHONE SIGNAL
AB
Continuity
Connector Terminal Connector Terminal
M45 72
R109 1
Ye s
71 2
70 4
A —Con tin uit y
Connector Terminal
M45 70
GroundNo
71
72
AWLIA1603ZZ
4 - Ground : Approx. 5V
WKIA5796E
Revision: April 20092010 QX56

AV-116
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AV CONTROL UNIT
Wiring Diagram
INFOID:0000000005146346
ABNWA0012GB
Revision: April 20092010 QX56

AV-158
< SYMPTOM DIAGNOSIS >[AUDIO SYSTEM]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000005146353
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 s ent 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, AV control unit malfunc-
tion
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: April 20092010 QX56

AV-166
< PRECAUTION >[AUDIO SYSTEM]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005358679
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005327545
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: April 20092010 QX56

BCS-2
COMB SW .................................................................25
COMB SW : CONSULT-III Function (BCM -
COMB SW) .............................................................
25
IMMU ...................................................................... ...26
IMMU : CONSULT-III Function (BCM - IMMU) .......26
BATTERY SAVER ................................................. ...26
BATTERY SAVER : CONSULT-III Function (BCM
- BATTERY SAVER) ........................................... ...
26
TRUNK ................................................................... ...27
TRUNK : CONSULT-III Function (BCM - TRUNK) ...27
RETAINED PWR .................................................... ...27
RETAINED PWR : CONSULT-III Function (BCM -
RETAINED PWR) ...................................................
27
SIGNAL BUFFER ................................................... ...27
SIGNAL BUFFER : CONSULT-III Function (BCM
- SIGNAL BUFFER) ................................................
28
AIR PRESSURE MONITOR ................................... ...28
AIR PRESSURE MONITOR : Diagnosis Descrip-
tion ..........................................................................
28
AIR PRESSURE MONITOR : CONSULT-III Func-
tion ....................................................................... ...
30
THEFT ALM ........................................................... ...30
THEFT ALM : CONSULT-III Function (BCM -
THEFT ALM) ..........................................................
30
PANIC ALARM ....................................................... ...31
PANIC ALARM : CONSULT-III Function (BCM -
PANIC ALARM) ................................................... ...
31
COMPONENT DIAGNOSIS ........................32
U1000 CAN COMM CIRCUIT ......................... ...32
Description ........................................................... ...32
DTC Logic ...............................................................32
Diagnosis Procedure ..............................................32
POWER SUPPLY AND GROUND CIRCUIT .....33
Diagnosis Procedure ........................................... ...33
COMBINATION SWITCH INPUT CIRCUIT .......35
Diagnosis Procedure ............................................ ...35
Special Repair Requirement ...................................36
COMBINATION SWITCH OUTPUT CIRCUIT ...37
Diagnosis Procedure ...............................................37
Special Repair Requirement ...................................37
COMBINATION SWITCH ..................................38
Description ........................................................... ...38
Diagnosis Procedure ...............................................38
ECU DIAGNOSIS .......................................40
BCM (BODY CONTROL MODULE) ............... ...40
Reference Value .................................................. ...40
Terminal Layout ......................................................43
Physical Values .......................................................43
Wiring Diagram .......................................................49
Fail Safe .................................................................53
DTC Inspection Priority Chart ...............................54
DTC Index ..............................................................54
SYMPTOM DIAGNOSIS ............................56
COMBINATION SWITCH SYSTEM SYMP-
TOMS .............................................................. ...
56
Symptom Table .................................................... ...56
PRECAUTION ............................................57
PRECAUTIONS .............................................. ...57
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
57
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
57
ON-VEHICLE REPAIR ...............................59
BCM (BODY CONTROL MODULE) ............... ...59
Removal and Installation .........................................59
Revision: April 20092010 QX56