2011 INFINITI QX56 USB

AV-40
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AV CONTROL UNIT)
AV Communication
When “AV communication” of “CAN Diag Support Monitor” is selected, the f\
ollowing function will be performed.
ECU IDENTIFICATION
The part number of AV control unit is displayed.
SELF DIAGNOSIS RESULT
 In CONSULT-III self-diagnosis, self-diagnosis results and error history are displayed collectively.
 The current malfunction indicates “CRNT”. The past malfunction indicates “PAST”.
 The timing is displayed as “0” if any of the e rror codes [U1000], [U1010], [U1300] and [U1310] is detected.
The counter increases by 1 if the condition is normal at the next ignition switch ON cycle.
Self-diagnosis Results Display Item
Data Monitor The diagnosis of vehicle signal that is input to the AV control unit can be performed.
Work Support Steering angle sensor can be adjusted.
Configuration Read and save the vehicle specification.
 Write the vehicle specification when replacing AV control unit.
Diagnosis mode Description
AV communication
AV&NAVI C/U
Displays the communication status from AV control unit to each unit as well as the error
counter.
AUDIO Displays the AV control unit communication status and the error counter.
Error item Description Possible malfunction factor/Action to take
CAN COMM CIRCUIT [U1000] CAN communication malfunction is detect-
ed.Refer to
AV- 11 8 , "
DiagnosisProcedure".
CONTROL UNIT (CAN) [U1010] CAN initial diagnosis malfunction is detect-
ed.
Replace the AV control unit if the malfunc-
tion occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
CONTROL UNIT (AV) [U1310]
AV communication circuit initial diagnosis
malfunction is detected.
Cont Unit [U1200]
AV control unit malfunction is detected.
GYRO NO CONN [U1201]
G-SENSOR NO CONN [U1202]
CAN CONT [U1216]
BLUETOOTH MODULE [U1217]
SUB CPU CONN [U1228]
iPod CERTIFICATION [U1229]
Built-in AUDIO CONN [U122E]
HDD CONN [U1218]
AV control unit malfunction is detected. If the music box function has no mal-
functions, then there is a possibility of
the detection of a temporary malfunc-
tion.
 Replace the AV control unit if the mal- function occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
HDD READ [U1219]
HDD WRITE [U121A]
HDD COMM [U121B]
HDD ACCESS [U121C]
GPS COMM [U1204]
GPS malfunction is detected. An intermittent error caused by strong
radio interference may be detected un-
less any symptom (GPS reception error,
etc.) occurs.
 Replace the AV control unit if the mal- function occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
GPS ROM [U1205]
GPS RAM [U1206]
GPS RTC [U1207]
USB CONTROLLER [U1225] USB connection malfunction is detected.
Check that the connection to the USB con-
nector is normal.
Revision: 2010 May2011 QX56

AV
DIAGNOSIS SYSTEM (AV CONTROL UNIT)AV-41
< SYSTEM DESCRIPTION >
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DSP CONN [U121D] AV control unit malfunction is detected. If a disc can be played, then there is a
possibility of the detection of a tempo-
rary malfunction.
 Replace the AV control unit if the mal- function occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
DSP COMM [U121E]
DVD COMM [U1227] AV control unit malfunction is detected.  If DVD can be played, then there is a
possibility of the detection of a tempo-
rary malfunction.
 Replace the AV control unit if the mal- function occurs constantly.
Refer to AV- 2 1 2 , "
Removal and Installa-
tion".
CONFIG UNFINISH [U122A] The writing of configuration data is incom-
plete.Write configuration data with CONSULT-
III.
ST ANGLE SEN CALIB [U1232] 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
BRC-64, "
Work Procedure".
FRONT DISP CONN [U1243] 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.
GPS ANTENNA CONN [U1244] GPS antenna connection malfunction is
detected.Check the connection of the GPS antenna
connector.
 AV COMM CIRCUIT [U1300]
 VIDEO DIST CONN [U1246] 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 DISP CONN [U125A] 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.
XM ANTENNA CONN [U1258] Satellite radio antenna connection mal-
function is detected.Satellite radio antenna disconnection.
USB OVERCURRENT [U1263] Detection of overcurrent in USB connect-
er.Check USB harness between the AV con-
trol unit and USB connector.
ANTENNA AMP TERMINAL
[OPEN or SHORT]
[U1264] Radio antenna amp. ON signal circuit mal-
function is detected.
Radio antenna amp. ON signal circuit be-
tween AV control unit and antenna amp.
AMP ON TERMINAL
[GND-SHORT or VB-SHORT]
[U1265] BOSE amp. ON signal circuit malfunction
is detected.
BOSE amp. ON signal circuit between AV
control unit and BOSE amp.
Error item Description Possible malfunction factor/Action to take
Revision: 2010 May2011 QX56

AV
AV CONTROL UNITAV-53
< ECU DIAGNOSIS INFORMATION >
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(Y/L) 15
(B) Steering switch signal B Input Ignition
switch
ON Keep pressing VOL DOWN
switch.
0 V
Keep pressing VOL UP
switch. 1.0 V
Keep pressing switch. 2.0 V
Keep pressing switch. 3.0 V
Except for above. 5.0 V
19
(Y/R) Ground Battery power supply Input Ignition
switch
OFF — Battery voltage
20
(B) Ground Ground — Ignition
switch ON —0 V
26
(LG) Ground AUX image signal Input Ignition
switch ON At front AUX image is dis-
played.
29
(W/B) Ground Disk eject signal Input Ignition
switch
ON Pressing the eject switch. 0 V
Except for above. 5.0 V
30
(R/W) Ground Mode change signal Output Ignition
switch ON Driver's Audio Stage ON 0 V
Driver's Audio Stage OFF 8.5 V
33
(L) Ground
Composite image signal
ground —Ignition
switch ON —0 V
34
(P) Ground Composite image signal Output Ignition
switch ON When DVD, USB or front
AUX image is displayed on
headrest display unit LH or
RH.
46
(V) Ground AUX image signal ground — Ignition
switch ON —0 V
47 — Shield — — — —
49
(R/W) Ground Switch ground — Ignition
switch
ON —0 V
53 — Shield — — — —
65
(W) Ground Parking brake signal Input Ignition
switch ON Parking brake is applied. 0 V
Parking brake is released. 4.5 V
67
(W) Ground Composite image signal
ground —Ignition
switch ON —0 V
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
SKIB2251J
SKIB2251J
Revision: 2010 May2011 QX56

AV-56
< ECU DIAGNOSIS INFORMATION >
AV CONTROL UNIT
106(W) 120
(R) Sound signal LH Output Ignition
switch ON When DVD or USB mode is
selected on headrest dis-
play unit LH or RH.
107 (B) 121
(G) Sound signal RH Output Ignition
switch ON When DVD or USB mode is
selected on headrest dis-
play unit LH or RH.
11 7 — S h i e l d — — — —
11 8 (O) 11 9
(W/L) AUX sound signal RH Input Ignition
switch ON When front AUX mode is
selected.
122 — Shield — — — —
129 (G) — USB ground — — — —
130 (R) — USB D
− signal — — — —
131 (W) — V BUS signal — — — —
132 (L) — USB D+ signal — — — —
133 — Shield — — — —
150 — FM sub Input — — —
151 — AM-FM main Input — — —
152 Ground Antenna amp. ON signal Input Ignition
switch ON —12.0 V
153 Ground GPS antenna signal Input Ignition
switch ON Not connected GPS anten-
na connector.
5.0 V
154 — Shield — — — —
157 Ground RGB digital image signal
(
− ) OutputIgnition
switch
ON Not connected connector. 1.3 V
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
SKIB3609E
SKIB3609E
SKIB3609E
Revision: 2010 May2011 QX56

AV-58
< ECU DIAGNOSIS INFORMATION >
AV CONTROL UNIT
DTC Display item Refer to
U1000 CAN COMM CIRCUIT [U1000] AV- 11 8 , "
DiagnosisProcedure"
U1010 CONTROL UNIT (CAN) [1010] AV- 11 9 , "DTC Logic"
U1200 Cont Unit [U1200]AV- 1 2 0 , "DTC Logic"
U1201 GYRO NO CONN [U1201]AV- 1 2 1 , "DTC Logic"
U1202 G-SENSOR NO CONN [U1202]AV- 1 2 2 , "DTC Logic"
U1204 GPS COMM [U1204]AV- 1 2 3 , "Diagnosis Procedure"
U1205 GPS ROM [U1205]AV- 1 2 4 , "Diagnosis Procedure"
U1206 GPS RAM [U1206]AV- 1 2 5 , "Diagnosis Procedure"
U1207 GPS RTC [U1207]AV- 1 2 6 , "Diagnosis Procedure"
U1216 CAN CONT [U1216] AV- 1 2 7 , "DTC Logic"
U1217 BLUETOOTH MODULE [U1217]AV- 1 2 8 , "DTC Logic"
U1218 HDD CONN [U1218]AV- 1 2 9 , "Diagnosis Procedure"
U1219 HDD READ [U1219]AV- 1 3 0 , "Diagnosis Procedure"
U121A HDD WRITE [U121A] AV- 1 3 1 , "Diagnosis Procedure"
U121B HDD COMM [U121B]AV- 1 3 2 , "Diagnosis Procedure"
U121C HDD ACCESS [U121C] AV- 1 3 3 , "Diagnosis Procedure"
U121D DSP CONN [U121D]AV- 1 3 4 , "Diagnosis Procedure"
U121E DSP COMM [U121E]AV- 1 3 5 , "Diagnosis Procedure"
U1225 USB CONTROLLER [U1225] AV- 1 3 6 , "DTC Logic"
U1227 DVD COMM [U1227]AV- 1 3 7 , "Diagnosis Procedure"
U1228 SUB CPU CONN [U1228] AV- 1 3 8 , "DTC Logic"
U1229 iPod CERTIFICATION [U1229]AV- 1 3 9 , "DTC Logic"
U122A CONFIG UNFINISH [U122A]AV- 1 4 0 , "Diagnosis Procedure"
U122E Built-in AUDIO CONN [U122E] AV- 1 4 1 , "DTC Logic"
U1232 ST ANGLE SEN CALIB [1232]AV- 1 4 2 , "Diagnosis Procedure"
U1243 FRONT DISP CONN [U1243]AV- 1 4 3 , "Diagnosis Procedure"
U1244 GPS ANTENNA CONN [U1244]AV- 1 4 5 , "Diagnosis Procedure"
U1258 XM ANTENNA CONN [U1258]AV- 1 4 6 , "Diagnosis Procedure"
U125A 3RD DISP CONN [U125A] AV- 1 4 7 , "Diagnosis Procedure"
U1263 USB OVERCURRENT [U1263]AV- 1 4 8 , "Diagnosis Procedure"
U1264ANTENNA AMP TERMINAL [OPEN or
SHORT] [U1264] AV- 1 4 9 , "Diagnosis Procedure"
U1265
AMP ON TERMINAL [GND-SHORT or VB-
SHORT] [U1265] AV- 1 5 0 , "Diagnosis Procedure"
U1310 CONTROL UNIT (AV) [U1310]
AV- 1 5 2 , "DTC Logic"
Revision: 2010 May2011 QX56

AV
HEADREST DISPLAY UNITAV-63
< ECU DIAGNOSIS INFORMATION >
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19
(L/Y) Ground Cont. ground — Ignition
switch ON —0 V
20
(W/L) Ground Image switch signal Output Ignition
switch ON When DVD, USB or front
AUX image is displayed on
headrest display unit.
0.5 V
When rear AUX image is
displayed on headrest dis-
play unit. 4.5 V
23
(R/L) Ground Composite image signal
ground
—Ignition
switch ON —0 V
24
(Y) Ground Composite image signal Input Ignition
switch ON When DVD, USB or front
AUX image is displayed on
headrest display unit.
25 — Shield — — — —
27
(R/W) Ground AV ground — Ignition
switch
ON —0 V
28 — Shield — — — —
30
(P) 29
(BR) Headphone sound signal
RH
InputIgnition
switch
ON Headphone sound output.
32
(SB) 31
(LG) Headphone sound signal
LH
InputIgnition
switch ON Headphone sound output.
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
SKIB2251J
SKIB3609E
SKIB3609E
Revision: 2010 May2011 QX56

AV-64
< ECU DIAGNOSIS INFORMATION >
VIDEO DISTRIBUTOR
VIDEO DISTRIBUTOR
Reference ValueINFOID:0000000006216230
TERMINAL LAYOUT
PHYSICAL VALUES
JSNIA3024ZZ
Terminal
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
1
(B) —Ground — Ignition
switch
ON —0 V
2
(Y/R) Ground Battery power supply Input Ignition
switch OFF — Battery voltage
3
(B) —Ground — Ignition
switch
ON —0 V
4
(V) Ground ACC power supply Input Ignition
switch ACC — Battery voltage
5
(V/W) Ground Cont. ground for headrest
display unit RH —Ignition
switch ON —0 V
6
(L/W) Ground ACC signal for headrest
display unit RH OutputIgnition
switch
OFF — 3.3 V
Ignition switch ACC —0 V
7
(W/R) Ground Cont. ground for headrest
display unit LH —Ignition
switch ON —0 V
8
(GR/R) GroundACC signal for headrest
display unit LH OutputIgnition
switch
OFF — 3.3 V
Ignition switch ACC —0 V
9
(O/B) Ground Image switch signal for
headrest display unit RH
InputIgnition
switch ON When DVD, USB or front
AUX image is displayed on
headrest display unit RH.
0.5 V
When rear AUX image is
displayed on headrest dis-
play unit RH. 4.5 V
Revision: 2010 May2011 QX56

AV
VIDEO DISTRIBUTORAV-65
< ECU DIAGNOSIS INFORMATION >
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10
(R/B) Ground
Image switch signal for
headrest display unit LH InputIgnition
switch
ON When DVD, USB or front
AUX image is displayed on
headrest display unit LH.
0.5 V
When rear AUX image is
displayed on headrest dis-
play unit LH. 4.5 V
14
(B) 15
(G) Headphone sound signal
RH for headrest display unit
RH
OutputIgnition
switch ON Output headphone sound
from headrest display unit
RH to headphone.
16
(W) 17
(R) Headphone sound signal
LH for headrest display unit
RH
Output
Ignition
switch
ON Output headphone sound
from headrest display unit
RH to headphone.
18
(P/L) Ground
AV ground for headrest dis-
play unit RH —Ignition
switch
ON —0 V
19
(P) Ground AV ground for headrest dis-
play unit LH
—Ignition
switch ON —0 V
20
(B) 21
(G) Headphone sound signal
RH for headrest display unit
LH
Output
Ignition
switch
ON Output headphone sound
from headrest display unit
LH to headphone.
22
(W) 23
(R) Headphone sound signal
LH for headrest display unit
LH
OutputIgnition
switch ON Output headphone sound
from headrest display unit
LH to headphone.
27
(W) Ground Composite image signal
ground for headrest display
unit RH
—Ignition
switch ON —0 V
28
(R)
Ground Composite image signal for
headrest display unit RH
OutputIgnition
switch ON When DVD, USB, front
AUX or rear AUX image is
displayed on headrest dis-
play unit RH.
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal name Input/
Output
SKIB3609E
SKIB3609E
SKIB3609E
SKIB3609E
SKIB2251J
Revision: 2010 May2011 QX56