air condition INFINITI QX56 2009 Factory Owner's Guide

AV-58
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
U121F AV CONTROL UNIT
U121F AV CONTROL UNIT
DescriptionINFOID:0000000004110660
DTC LogicINFOID:0000000003776828
Diagnosis ProcedureINFOID:0000000003776829
1.CHECK AV CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT
Check AV control unit power supply and ground circuit. Refer to AV-68, "
AV CONTROL UNIT : Diagnosis Pro-
cedure".
Is inspection result OK?
YES >> Inspection End.
NO >> Repair malfunctioning parts.
Part name Description
AV CONTROL UNIT • Integrates HDD (hard disk dr
ive) 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 means of communication. It operates each system according to com-
munication signals from the AV control unit.
• The AV control unit includes the audio, hands-free phone, voice control, navi-
gation, and vehicle information functions.
• It is connected to ECM and combination meter via CAN communication to ob- tain necessary information for the vehicle information function.
• It inputs the automatic brightness ON/OFF signals that are required for the dis- play dimming control.
• It inputs the signals for driving status recognition (vehicle speed, reverse and parking brake).
DTC Display contents of
CONSULT-III DTC Detection Condition
Action to take
U121F INTERNAL COMM
[U121F] Internal malfunction of AV control unit (internal communi-
cation error)
is detected. AV control unit power supply and
ground circuit.
Revision: December 20092009 QX56

AV-60
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
U1243 DISPLAY UNIT
U1243 DISPLAY UNIT
DescriptionINFOID:0000000003776832
DTC LogicINFOID:0000000003776833
Diagnosis ProcedureINFOID:0000000003776834
1.CHECK DISPLAY UNIT POWER
SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. Refer to AV-69, "
DISPLAY UNIT : Diagnosis Procedure".
Is inspection result OK?
YES >> GO TO 2.
NO >> Repair malfunctioning parts.
2.CHECK CONTINUITY CO MMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit connector M43.
3. Check continuity between display unit harness connector M93 (A) terminals 11, 22 and AV control unit harness connector M43
(B) terminals 30, 31.
4. Check continuity between display unit harness connector M93 (A) terminals 11, 22 and ground.
Are continuity results as specified?
YES >> GO TO 3.
NO >> Repair harness or connector.
Part name Description
DISPLAY UNIT • Display image is controlled by the serial communication from AV control unit.
• RGB image signal is input from AV control unit (RGB, RGB area and RGB syn-
chronizing). Auxiliary image signal is input from the auxiliary input jack. Cam-
era image signal is input from the camera control unit.
• Synchronize signal (HP, VP) is output to AV control unit.
• Touch panel function can be operated for each system by touching a display directly.
DTC Display contents of
CONSULT-III DTC Detection Condition
Possible causes
U1243 FRONT DISP CONN
[U1243] • Display unit power supply and ground circuit malfunc-
tion is detected.
• Malfunction is detected on communication circuit be- tween display unit and AV control unit.
• Malfunction is detected on communication signal be-
tween display unit and AV control unit. • Display unit power supply and
ground circuit.
• Communication circuit between display unit and AV control unit.
AB Continuity
Connector Terminal Connector Terminal
M93 11
M43 30
Ye s
22 31
A —Contin u it y
Connector Terminal
M93 11
Ground No
22
ALNIA0397GB
Revision: December 20092009 QX56

AV-62
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
U1244 GPS ANTENNA
U1244 GPS ANTENNA
DescriptionINFOID:0000000003776835
DTC LogicINFOID:0000000003776836
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000003776837
1.GPS ANTENNA CHECK
Inspect GPS antenna and antenna feeder for damage or poor connection.
Is the GPS antenna and feeder clean and undamaged?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK AV CONTROL UNIT VOLTAGE
1. Turn ignition switch ON.
2. Check voltage between AV control unit connector M124 terminal 116 and ground.
Is the voltage reading as specified?
YES >> Replace GPS antenna. Refer to AV-185, "Removal and
Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and
Installation".
Part Name Description
GPS ANTENNA GPS signal is detected and transmitted to the AV control unit.
DTC CONSULT-III display Detection condition
U1244 GPS ANTENNA CONN
[U1244]
GPS antenna connection malfunction is detected.
116 - Ground
: Approx. 5V
ALNIA0400GB
Revision: December 20092009 QX56

AV
RGB (R: RED) SIGNAL CIRCUITAV-77
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
C
D
E
F
G H
I
J
K L
M B A
O P
RGB (R: RED) SIGNAL CIRCUIT
DescriptionINFOID:0000000003776857
Transmit the image displayed with audio control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000003776858
1.CHECK CONTINUITY RGB (R: RED) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93 (A) terminal 17 and AV control unit harness connector M43 (B)
terminal 21.
4. Check continuity between display unit harness connector M93 (A) terminal 17 and ground.
Are the continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK RGB (R: RED) SIGNAL
1. Connect display unit connector M93 and AV control unit connec-
tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter-
minal 17 and ground.
Are the voltage readings as specified?
YES >> Replace display unit. Refer to AV-170, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M9317M4321 Yes
A —Continuity
Connector Terminal
M93 17Ground No
ALNIA0409GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 17 Ground Receive
audio sig-
nal
ALNIA0383GB
SKIB2238J
Revision: December 20092009 QX56

AV-78
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
RGB (G: GREEN) SIGNAL CIRCUIT
RGB (G: GREEN) SI
GNAL CIRCUIT
DescriptionINFOID:0000000003776859
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000003776860
1.CHECK CONTINUITY RGB (G: GREEN) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93 (A) terminal 6 and AV control unit harness connector M43 (B)
terminal 22.
4. Check continuity between display unit harness connector M93 (A) terminal 6 and ground.
Are the continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK RGB (G: GREEN) SIGNAL
1. Connect display unit connector M93 and AV control unit connec- tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter-
minal 6 and ground.
Are voltage readings as specified?
YES >> Replace display unit. Refer to AV-170, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M936M4322 Yes
A —Continuity
Connector Terminal
M93 6Ground No
ALNIA0410GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 6 Ground Receive
audio sig-
nal
ALNIA0385GB
SKIB2236J
Revision: December 20092009 QX56

AV
RGB (B: BLUE) SIGNAL CIRCUITAV-79
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
C
D
E
F
G H
I
J
K L
M B A
O P
RGB (B: BLUE) SIGNAL CIRCUIT
DescriptionINFOID:0000000003776861
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000003776862
1.CHECK CONTINUITY RGB (B : BLUE) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93 (A) terminal 18 and AV control unit harness connector M43 (B)
terminal 23.
4. Check continuity between display unit harness connector M93 (A) terminal 18 and ground.
Are continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK RGB (B: BLUE) SIGNAL
1. Connect display unit connector M93 and AV control unit connec-
tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter-
minal 18 and ground.
Are voltage readings as specified?
YES >> Replace display unit. Refer to AV-170, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M9318M4323 Yes
A —Continuity
Connector Terminal
M93 18Ground No
ALNIA0411GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 18 Ground Receive
audio sig-
nal
ALNIA0387GB
SKIB2237J
Revision: December 20092009 QX56

AV-80
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
RGB SYNCHRONIZING SIGNAL CIRCUIT
RGB SYNCHRONIZING SIGNAL CIRCUIT
DescriptionINFOID:0000000003776863
Transmit the RGB synchronizing signal to the display unit so as to synchronize the RGB image displayed with
AV control unit.
Diagnosis ProcedureINFOID:0000000003776864
1.CHECK CONTINUITY RGB SYNCHRO
NIZING SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93 (A) terminal 19 and AV control unit harness connector M43 (B)
terminal 25.
4. Check continuity between display unit harness connector M93 (A) terminal 19 and ground.
Are continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK RGB SYNCHRONIZING SIGNAL
1. Connect display unit connector M93 and AV control unit connec- tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter- minal 19 and ground.
Are voltage readings as specified?
YES >> Replace display unit. Refer to AV-170, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M9319M4325 Yes
A —Continuity
Connector Terminal
M93 19Ground No
ALNIA0412GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 19 Ground Receive
audio sig-
nal
ALNIA0389GB
SKIB3603E
Revision: December 20092009 QX56

AV
RGB AREA (YS) SIGNAL CIRCUITAV-81
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
C
D
E
F
G H
I
J
K L
M B A
O P
RGB AREA (YS) SI GNAL CIRCUIT
DescriptionINFOID:0000000003776865
Transmits the display area of RGB image displayed by AV control unit with RGB area (YS) signal to display
unit.
Diagnosis ProcedureINFOID:0000000003776866
1.CHECK CONTINUITY RGB AR EA (YS) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93 (A) terminal 9 and AV control unit harness connector M43 (B)
terminal 27.
4. Check continuity between display unit harness connector M93 (A) terminal 9 and ground.
Are continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK RGB SYNCHRONIZING SIGNAL
1. Connect display unit connector M93 and AV control unit connec-
tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter- minal 9 and ground.
Are voltage readings as specified?
YES >> Replace display unit. Refer to AV-170, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-168, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M93 9M43 27 Yes
A —Contin u it y
Connector Terminal
M93 9Ground No
ALNIA0413GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 9 Ground Receive
audio sig-
nal
ALNIA0391GB
PKIB4948J
Revision: December 20092009 QX56

AV-82
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
HORIZONTAL SYNCHRONIZING (HP) SIGNAL CIRCUIT
HORIZONTAL SYNCHRONIZING (HP) SIGNAL CIRCUIT
DescriptionINFOID:0000000003776867
In composite image (AUX image, camera image), transmit the vertical synchronizing (VP) signal and horizon-
tal synchronizing (HP) signal from display unit to AV
control unit so as to synchronize the RGB images dis-
played with AV control unit such as the image quality adjusting menu, etc.
Diagnosis ProcedureINFOID:0000000003776868
1.CHECK CONTINUITY HORIZONTAL SY NCHRONIZING (HP) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93
(A) terminal 8 and AV control unit harness connector M43 (B)
terminal 28.
4. Check continuity between display unit harness connector M93 (A) terminal 8 and ground.
Are continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK HORIZONTAL SYNCHRONIZING (HP) SIGNAL
1. Connect display unit connector M93 and AV control unit connec- tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter- minal 8 and ground.
Are voltage readings as specified?
YES >> Replace AV control unit. Refer to AV-168, "Removal and Installation".
NO >> Replace display unit. Refer to AV-170, "
Removal and Installation".
AB
Continuity
Connector Terminal Connector Terminal
M938M4328 Yes
A —Continuity
Connector Terminal
M93 8Ground No
ALNIA0414GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 8 Ground Receive
audio sig-
nal
ALNIA0396GB
SKIB3601E
Revision: December 20092009 QX56

AV
VERTICAL SYNCHRONIZING (VP) SIGNAL CIRCUITAV-83
< COMPONENT DIAGNOSIS > [AUDIO SYSTEM]
C
D
E
F
G H
I
J
K L
M B A
O P
VERTICAL SYNCHRONIZING (VP) SIGNAL CIRCUIT
DescriptionINFOID:0000000003776869
In composite image (AUX image, camera image), transmi t the vertical synchronizing (VP) signal and horizon-
tal synchronizing (HP) signal from display unit to AV control unit so as to synchronize the RGB images dis-
played with AV control unit such as the image quality adjusting menu, etc.
Diagnosis ProcedureINFOID:0000000003776870
1.CHECK CONTINUITY VERTICAL SINCHRO NIZING (VP) SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and AV control unit con- nector M43.
3. Check continuity between display unit harness connector M93
(A) terminal 20 and AV control unit harness connector M43 (B)
terminal 29.
4. Check continuity between display unit harness connector M93 (A) terminal 20 and ground.
Are continuity results as specified?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK VERTICAL SINCHRONIZING (VP) SIGNAL
1. Connect display unit connector M93 and AV control unit connec-
tor M43.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter- minal 20 and ground.
Are voltage readings as specified?
YES >> Replace AV control unit. Refer to AV-168, "Removal and Installation".
NO >> Replace display unit. Refer to AV-170, "
Removal and Installation".
AB Continuity
Connector Terminal Connector Terminal
M9320M4329 Yes
A —Contin u it y
Connector Terminal
M93 20Ground No
ALNIA0415GB
(+)
(-) Condition Reference signal
Connector Terminal
M93 20 Ground Receive
audio sig-
nal
ALNIA0393GB
SKIB3598E
Revision: December 20092009 QX56