2011 INFINITI QX56 USB

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INFINITI QX56 2011 Factory Service Manual
AV
AV-3
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U125A HEADREST DISPLAY UNIT .............. ..147
DTC Logic ........................................................... ..147
Diagnosis Procedure ..............

AV
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U125A HEADREST DISPLAY UNIT .............. ..147
DTC Logic ........................................................... ..147
Diagnosis Procedure .............................................147
U1263 USB .......................................................148
DTC Logic ........................................................... ..148
Diagnosis Procedure .............................................148
U1264 ANTENNA AMP. ...................................149
DTC Logic ........................................................... ..149
Diagnosis Procedure .............................................149
U1265 BOSE AMP. ..........................................150
DTC Logic ........................................................... ..150
Diagnosis Procedure .............................................150
U1300 AV COMM CIRCUIT .............................151
Description .......................................................... ..151
U1310 AV CONTROL UNIT .............................152
DTC Logic ........................................................... ..152
B2700 CORNER SENSOR [FL] .......................153
DTC Logic ........................................................... ..153
B2701 SENSOR HARNESS OPEN [CR-FL] ...154
DTC Logic ........................................................... ..154
Diagnosis Procedure .............................................154
B2702 CORNER SENSOR [FR] ......................155
DTC Logic ........................................................... ..155
B2703 SENSOR HARNESS OPEN [CR-FR] ...156
DTC Logic ........................................................... ..156
Diagnosis Procedure .............................................156
B2704 CORNER SENSOR [RL] ......................157
DTC Logic ........................................................... ..157
B2705 SENSOR HARNESS OPEN [CR-RL] ...158
DTC Logic ........................................................... ..158
Diagnosis Procedure .............................................158
B2706 CORNER SENSOR [RR] ......................159
DTC Logic ........................................................... ..159
B2707 SENSOR HARNESS OPEN [CR-RR] ..160
DTC Logic .............................................................160
Diagnosis Procedure .............................................160
POWER SUPPLY AND GROUND CIRCUIT ....161
AV CONTROL UNIT .............................................. ..161
AV CONTROL UNIT : Diagnosis Procedure .........161
FRONT DISPLAY UNIT ......................................... ..161
FRONT DISPLAY UNIT : Diagnosis Procedure ....161
HEADREST DISPLAY UNIT ................................. ..162
HEADREST DISPLAY UNIT : Diagnosis Proce-
dure ..................................................................... ..
162
VIDEO DISTRIBUTOR .......................................... ..163
VIDEO DISTRIBUTOR : Diagnosis Procedure ......163
BOSE AMP. ........................................................... ..163
BOSE AMP. : Diagnosis Procedure ......................163
AROUND VIEW MONITOR CONTROL UNIT .........164
AROUND VIEW MONITOR CONTROL UNIT : Di-
agnosis Procedure ............................................... ..
164
SONAR CONTROL UNIT (WITH AROUND VIEW
MONITOR) ............................................................. ..
165
SONAR CONTROL UNIT (WITH AROUND VIEW
MONITOR) : Diagnosis Procedure ........................
165
RGB DIGITAL IMAGE SIGNAL CIRCUIT ......166
Description .............................................................166
Diagnosis Procedure .............................................166
COMPOSITE IMAGE SIGNAL CIRCUIT (AV
CONTROL UNIT TO FRONT DISPLAY UNIT) .
167
Description ........................................................... ..167
Diagnosis Procedure .............................................167
COMPOSITE IMAGE SIGNAL CIRCUIT (AV
CONTROL UNIT TO VIDEO DISTRIBUTOR) .
168
Description .............................................................168
Diagnosis Procedure .............................................168
COMPOSITE IMAGE SIGNAL CIRCUIT (VID-
EO DISTRIBUTOR TO HEADREST DISPLAY
UNIT) ...............................................................
169
Description .............................................................169
Diagnosis Procedure .............................................169
AUX IMAGE SIGNAL CIRCUIT (FRONT AUX-
ILIARY INPUT JACKS TO AV CONTROL
UNIT) ...............................................................
171
Description .............................................................171
Diagnosis Procedure .............................................171
AUX IMAGE SIGNAL CIRCUIT (REAR AUX-
ILIARY INPUT JACKS TO VIDEO DISTRIBU-
TOR) ................................................................
172
Description .............................................................172
Diagnosis Procedure .............................................172
IMAGE SWITCH SIGNAL CIRCUIT ................173
Description .............................................................173
Diagnosis Procedure .............................................173
LOCATION RECOGNITION SIGNAL CIR-
CUIT ................................................................
175
Description .............................................................175
Diagnosis Procedure .............................................175
DISK EJECT SIGNAL CIRCUIT .....................176
Description .............................................................176
Diagnosis Procedure .............................................176
MODE CHANGE SIGNAL CIRCUIT ...............177
Description .............................................................177
Revision: 2010 May2011 QX56

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USB CONNECTOR ........................................ ..230
Removal and Installation ..................................... ..230
MICROPHONE ...................

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INFINITI QX56 2011 Factory Service Manual
AV-10
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Component Description
INFOID:0000000006216214
1. Squawker RH 2. Center speaker 3. Corner sensor front RH
4. Squawker LH 5. Front camera 6. Corner sensor f

AV-10
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Component Description
INFOID:0000000006216214
1. Squawker RH 2. Center speaker 3. Corner sensor front RH
4. Squawker LH 5. Front camera 6. Corner sensor front LH
7. Side camera LH 8. Front door speaker LH 9. Headrest display unit LH
10. Rear door tweeter LH 11. Rear door speaker LH 12. Roof speaker LH
13. Woofer 14. Corner sensor rear LH 15. Satellite radio antenna
16. Rear camera 17. Corner sensor rear RH 18. BOSE amp.
19. Roof speaker RH 20. Antenna amp. 21. Rear door speaker RH
22. Rear door tweeter RH 23. Headrest display unit RH 24. Front door speaker RH
25. Side camera RH and infrared LED
(auxiliary lighting) 26. Front display unit 27. Steering switch
28. Sonar control unit 29. Steering angle sensor 30. Preset switch
31. Around view monitor control unit 32. USB connector 33. Front auxiliary input jacks
34. Rear auxiliary input jacks 35. AV control unit 36. Video distributor
37. Multifunction switch 38. GPS antenna 39. Microphone A. Luggage side lower finisher LH re-
moved condition B.Luggage side lower finisher RH re-
moved condition C.Headlining assembly removed condi-
tion
D. Instrument lower
panel LH removed
condition E. Spiral cable part F. Cluste
r lid C removed condition
G. Within center console H. Instrument panel rear side
Part name Description
AV control unit Integrates hard disk drive (HDD) allowing map data and music data to be stored.
It is the master unit of the MULTI AV system, and it is connected to each control
unit by communication. It operates each system according to communication sig-
nals from the AV control unit.
The AV control unit includes the audio, hands-free phone, navigation, USB con- nection, DVD play and vehicle information functions.
It is connected to ECM and combination meter via CAN communication to obtain
necessary information for the vehicle information function.
It inputs the illumination signals that are required for the front display dimming con- trol.
It inputs the signals for driving status recognition (vehicle speed, reverse and park- ing brake).
The RGB digital image signal and composite image signal are output to front dis-
play unit.
Switches image and sound output to video distributor, inputting image switch sig- nal from headrest display unit via AV communication.
Amp. ON signal and mode change signal transmitted to BOSE amp.
Update of map data is performed with the DVD-ROM.
Front display unit Front display image is controlled by the serial communication from AV control unit.
RGB digital image signal is input from AV control unit.
Composite image signal is input from AV control unit.
Camera image signal is input from around view monitor control unit.
Touch panel function can be operated for each system by touching a display di-
rectly.
Headrest display unit Composite image signal [USB (video data), DVD and auxiliary input images] is in-
put from the video distributor.
It receives the DVD/AUX/USB sound signal from the video distributor, and then transmits it to the headphones.
Outputs image switch signal to video distributor via hard wire, according to rear seat remote controller operation.
Outputs image switch signal to AV control unit via AV communication, according to
rear seat remote controller operation.
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
AV-12
< SYSTEM DESCRIPTION >
COMPONENT PARTS
*1: Image signals cannot be received from iPod®.
Side camera RH It inputs the power supply from around view monitor control unit and outputs the
image

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INFINITI QX56 2011 Factory Service Manual
AV-14
< SYSTEM DESCRIPTION >
SYSTEM
MULTI AV SYSTEM : System Description
INFOID:0000000006216216
Multi AV system means that the following systems are integrated.
COMMUNICATION SIGNAL
AV control un

AV-14
< SYSTEM DESCRIPTION >
SYSTEM
MULTI AV SYSTEM : System Description
INFOID:0000000006216216
Multi AV system means that the following systems are integrated.
COMMUNICATION SIGNAL
AV control unit function by transmitting/receiving dat a one by one with each unit (slave unit) that configures
them completely as a master unit by connecting between units that configure MULTI AV system with two AV
communication lines (H, L).
Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
AV control unit is connected by CAN communication, and it receives data signal from ECM and combination
meter It computes and displays fuel economy information value with the obtained information. Transmitting/
receiving of data signal is performed by BCM. Also, it transmits the required signal of vehicle setting and
receives the response signal.
AV control unit is connected with front display unit and serial communication, and it transmits the required
signal of display and display control and receives the response signal from front display unit.
NAVIGATION SYSTEM FUNCTION
Description
The AV control unit controls navigation function whil e GPS tuner has built-in map data, GYRO (angle speed
sensor), on the HDD (Hard Disk Drive).
The AV control unit inputs operation signal with communication signal, through display (touch panel) and multifunction switch and steering switch.
Guide sound is output to front speaker through BOSE am p. from AV control unit when operating navigation
system.
A vehicle position is calculated with the GYRO (angl e speed sensor), vehicle sensor, signal from GPS satel-
lite and map data stored on HDD (Hard Disk Drive), and transmits the map image signal (RGB image, RGB
area, RGB image synchronizing) to the display.
Position Detection Principle
The navigation system periodically calculates the current vehicle
position according to the following three types of signals.
Travel distance of the vehicle as determined by the vehicle speed
sensor
Vehicle turning angle determined by the gyroscope (angular speed
sensor)
The travel direction of the v ehicle determined by the GPS antenna
(GPS information)
The current position of the vehicle is then identified by comparing the
calculated vehicle position with map data, which is stored in the HDD
(Hard Disk Drive) (map-matching), and indicated on the screen with
a current location mark. More accurate data is used by comparing
position detection results from GPS to the map-matching.
FUNCTION NAME
Navigation system function Audio function
DVD play function
Front auxiliary input function USB connection function
Mobile entertainment system Hands-free phone function Touch panel function
Around view monitor function
Camera assistance sonar system Vehicle information function
Auto Light adjustment system
JSNIA0177GB
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
AV
SYSTEMAV-17
< SYSTEM DESCRIPTION >
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Operating signal is transmitted to AV control unit wit h AV communication when it is operated by multifunction
switch or preset sw

AV
SYSTEMAV-17
< SYSTEM DESCRIPTION >
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Operating signal is transmitted to AV control unit wit h AV communication when it is operated by multifunction
switch or preset switch. The disk ejection operating signal is performed by hardwire.
Operating signal is transmitted to AV control unit with steering switch signal when it is operated by steering
switch.
Screen Display
Switching of display is performed with serial comm unication between front display unit and AV control unit.
AM/FM Radio Mode
AM/FM radio tuner is built into AV control unit.
AM/FM radio wave is received by radio antenna, next it is amplified by antenna amp., and finally it is input to
AV control unit.
FM radio wave is received by FM sub antenna, and it is transmitted to the AV control unit directly.
Audio signal is input to BOSE amp. and BOSE amp. outputs to each speaker.
Satellite Radio Mode
Satellite radio tuner is built into AV control unit.
Sound signal (satellite radio) is received by satel lite radio antenna and transmitted to AV control unit. AV
control unit outputs sound signal to BOSE amp. The si gnal is also outputted from BOSE amp. to each
speaker.
CD Mode
CD function is built into AV control unit.
AV control unit outputs audio signal to BOSE amp., and BOSE amp. outputs to each speaker when CD is
inserted to AV control unit.
Bluetooth™ Audio Mode
Bluetooth™ audio function is built into AV control unit.
Bluetooth
™ audio can play music data in the portable audio by means of Bluetooth™ communications
between the portable audio and the AV control unit.
AV control unit outputs audio signal to BOSE amp., and BOSE amp. outputs to each speaker.
Music Box Mode
Music CD data is stored on HDD that is built into AV control unit, and it can be played.
AV control unit outputs music (sound signal) that is stored on HDD to BOSE amp., and BOSE amp. outputs
to each speaker.
Speed Sensitive Volume
Volume level of this system gone up and down autom atically in proportion to the vehicle speed.
The control level can be selected by the customer.
Driver's Audio Stage
Driver's Audio Stage controls the speaker's output characte ristic by BOSE amp. so that the driver's seat is to
be the center of sounds.
ON/OFF signals of Driver's Audio Stage are transmitt ed from AV control unit to BOSE amp. using mode
change signal.
DVD PLAY FUNCTION
DVD is played by inserting DVD into the AV control unit.
DVD image signals are transmitted to the front display unit, and DVD sound signals are transmitted to each
speaker via BOSE amp.
DVD image signals and sound signals are transmitted to the headrest display unit via the video distributor.
The headrest display unit transmits the sound signals to the headphone via infrared communication.
USB CONNECTION FUNCTION
Connecting iPod® or USB memory allows the driver to play iPod® music files or USB memory-stored music
files, video data, and image viewer data.
Sound signals of music files stored in iPod
® or USB memory are transmitted from the USB connector to the
AV control unit. The AV control unit transmits t he sound signals to the BOSE amp. and video distributor.
Sound signals transmitted from the BOSE amp. to each speaker, and sound signals transmitted from the
video distributor to headphone via headrest display unit
Video signals and image viewer file signals are transmitt ed from the USB connector to the AV control unit.
The data and files are displayed on the front display unit screen.
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INFINITI QX56 2011 Factory Service Manual
AV-18
< SYSTEM DESCRIPTION >
SYSTEM
Video signals are transmitted from the USB connector to the AV control unit. The data and files are displayed
on the headrest display unit screen.
iPod
® is re

AV-18
< SYSTEM DESCRIPTION >
SYSTEM
Video signals are transmitted from the USB connector to the AV control unit. The data and files are displayed
on the headrest display unit screen.
iPod
® is recharged when connected to USB connector.
Only files that meet the following conditions will be played.
NOTE:
iPod
® is a trademark of Apple inc., regist ered in the U.S. and other countries.
Image signals cannot be received from iPod
®.
Use the enclosed USB harness when connecting iPod
® to USB connector.
If a video-sound codec combination is not satisfied, its video file may not be played.
Signals cannot be transmitted to video dist ributor under the following conditions:
- Only sound signal or only image viewer data is stored in iPod
®
- Only sound signal or only image viewer data is stored in USB memory
FRONT AUXILIARY INPUT FUNCTION
Image and sound can be output from an external devic e by connecting a device with front auxiliary input
jacks.
AUX image signals are transmitted to each unit as follows:
- To the front display unit via AV control unit.
- To the headrest display unit via AV control unit and video distributor.
AUX sound signals are transmitted to each unit as follows:
- To each speaker via AV control unit and BOSE amp.
- To the video distributor via AV control unit, and headphone sound signals are transmitted to infrared commu-
nication between headrest display unit and headphone.
MOBILE ENTERTAINMENT SYSTEM
Image and sound (DVD, USB memory-stored video data and front auxiliary input) played by AV control unit can be enjoyed in rear seat using headrest display unit and headphone.
Image and sound of external device connected to rear aux iliary input jacks for rear seat can be enjoyed in
rear seat using headrest display unit and headphone. Al so, image and sound from rear auxiliary input jacks
can be selected and played individually on each side as well as on both sides.
Headrest display unit has the self-diagnosis function. Refer to AV-49, "
On Board Diagnosis Function".
NOTE:
Image signal and sound signal from rear auxiliary input ja cks is not transmitted to front display unit and each
speaker.
Operating Signal
The mobile entertainment system can be controlled by one of the rear seat remote controller.
It receives the operation signal of the rear seat remote controller by the remote control receiver built into
headrest display unit, and then transmits it to the AV control unit and the video distributor.
Headphone Sound
Sound signal output from AV control unit or rear auxilia ry input jacks are transmitted to headrest display unit
via video distributor.
Headphone sound signals are transmitted to infrared communication between headrest display unit and
headphone.
Screen headrest display
Image signal output from AV control unit or rear auxili ary input jacks are transmitted to headrest display unit
via video distributor.
Image switch signal is input from headrest display uni t to AV control unit or from headrest display unit to
video distributor, according to rear seat remote controller operation.
When image switch signal is transmitted from headrest display unit to AV control unit via AV communication,
image played by AV control unit (DVD, USB memory-sto red video data, and front auxiliary input) switches.
When image switch signal is input from headrest displa y unit to video distributor via hard wire, image output
from AV control unit and image output from rear auxiliary input jacks switch.
Music file Video file Image viewer file
File format “MP3”, “WMA”, “AAC”, “M4A” “DivX”, “MPEG4 (ASF)” “JPEG”
File extension “.mp3”, “.wma”, “.aac”, “.m4 a” “.divx”, “.afs”, “.avi” “.jpg”, “.jpeg”
Maximum file size 2 GB 2 GB 2 MB
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
AV-36
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AV CONTROL UNIT)
Unfinished configurationThe writing of configuration data is incom-
plete.Write configuration data with CONSULT-III.
USB Controller Com

AV-36
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AV CONTROL UNIT)
Unfinished configurationThe writing of configuration data is incom-
plete.Write configuration data with CONSULT-III.
USB Controller Communication Error USB connection malfunction is detected. Check that the connection to the USB con-
nector is normal.
DVD Mechanism Communication Error AV control unit malfunction is detected. If DVD can be played, then there is a
possibility of the detection of a temporary
malfunction.
Replace the AV control unit if the mal- function occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
Steer. Angle Sensor Calibration Predictive course line center position ad-
justment of the steering angle sensor is in-
complete.Adjust the predictive course line center po-
sition of the steering angle sensor.
Refer to
AV- 3 9 , "
CONSULT-III Function".
Front Display Connection Error When either one of the following items are
detected:
front display unit power supply and
ground circuits are malfunctioning.
Serial communication circuits between AV control unit and front display unit are
malfunctioning. Front display unit power supply and
ground circuits.
Serial communication circuits between AV control unit and front display unit.
AV COMM CIRCUIT
2nd Display Co nnection Error When either one of the following items are
detected:
video distributor power supply and
ground circuits are malfunctioning.
headrest display unit LH power supply and ground circuits are malfunctioning.
AV communication circuits between AV
control unit and headrest display unit LH
are malfunctioning.
location recognition signal circuit be-
tween headrest display unit LH and
ground is malfunctioning. Video distributor power supply and
ground circuits.
Headrest display unit LH power supply and ground circuits.
AV communication circuits between AV control unit and headrest display unit LH.
Location recognition signal circuit be-
tween headrest display unit LH and
ground.
3rd Display Connection Error When either one of the following items are
detected:
headrest display unit RH power supply
and ground circuits are malfunctioning.
AV communication circuits between
headrest display unit LH and headrest
display unit RH are malfunctioning.
location recognition signal circuit be- tween headrest display unit RH and
ground is malfunctioning. Headrest display unit RH power supply
and ground circuits.
AV communication circuits between headrest display unit LH and headrest
display unit RH.
Location recognition signal circuit be- tween headrest display unit RH and
ground.
AM/FM antenna amplifier short to ground Radio antenna amp. ON signal circuit mal-
function is detected.Radio antenna amp. ON signal circuit be-
tween AV control unit and antenna amp.
AM/FM antenna amplifier open
Ext_Amp_ON output terminal short to
ground BOSE amp. ON signal circuit malfunction is
detected.BOSE amp. ON signal circuit between AV
control unit and BOSE amp.
Ext_Amp_ON output terminal :open
GPS Antenna Error GPS antenna connection malfunction is de-
tected.Check the connection of the GPS antenna
connector.
XM Antenna Connection Error Satellite radio antenna connection malfunc-
tion is detected.
Satellite radio antenna disconnection.
USB electric current Error Detection of overcurrent in USB connector. Check USB harness between the AV con-
trol unit and USB connector.
Error item Description Possible malfunction factor/Action to take
Revision: 2010 May2011 QX56

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