2008 INFINITI QX56 air condition

AV-60
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
U1258 SATELLITE RADIO ANTENNA
U1258 SATELLITE RADIO ANTENNA
DescriptionINFOID:0000000001696091
DTC LogicINFOID:0000000001696092
Diagnosis ProcedureINFOID:0000000001696093
1.SATELLITE RADIO ANTENNA CHECK
Visually check satellite radio antenna and antenna feeder.
Is inspection result OK?
YES >> GO TO 2
NO >> Repair malfunctioning parts.
2.CHECK AV CONTROL UNIT VOLTAGE
1. Disconnect AV control unit connector M125.
2. Turn ignition switch ON.
3. Check voltage between AV control unit connector M125 termi- nal 118 and ground.
Is voltage approximately 5 volts?
YES >> Inspection end.
NO >> Replace AV control unit. Refer to AV-164, "
Removal and
Installation".
Part name Description
SATELLITE RADIO ANTENNA Satellite radio signal is received and sent to audio control unit.
DTCDisplay contents of
CONSULT-III DTC Detection Condition
Possible causes
U1258 XM ANETNNA CONN
[U1258] Satellite radio antenna connection malfunction is detect-
ed.
Satellite radio antenna disconnection.
118 - Ground
: Approx. 5 V
ALNIA0403GB
Revision: March 2010 2008 QX56

AV
RGB (R: RED) SIGNAL CIRCUITAV-73
< 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:0000000001696107
Transmit the image displayed with audio control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000001696108
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-166, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV-74
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
RGB (G: GREEN) SIGNAL CIRCUIT
RGB (G: GREEN) SI
GNAL CIRCUIT
DescriptionINFOID:0000000001696109
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000001696110
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-166, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV
RGB (B: BLUE) SIGNAL CIRCUITAV-75
< 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:0000000001696111
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Diagnosis ProcedureINFOID:0000000001696112
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-166, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV-76
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
RGB SYNCHRONIZING SIGNAL CIRCUIT
RGB SYNCHRONIZING SIGNAL CIRCUIT
DescriptionINFOID:0000000001696113
Transmit the RGB synchronizing signal to the display unit so as to synchronize the RGB image displayed with
AV control unit.
Diagnosis ProcedureINFOID:0000000001696114
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-166, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV
RGB AREA (YS) SIGNAL CIRCUITAV-77
< 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:0000000001696115
Transmits the display area of RGB image displayed by AV control unit with RGB area (YS) signal to display
unit.
Diagnosis ProcedureINFOID:0000000001696116
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-166, "Removal and Installation".
NO >> Replace AV control unit. Refer to AV-164, "
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: March 2010
2008 QX56

AV-78
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
HORIZONTAL SYNCHRONIZING (HP) SIGNAL CIRCUIT
HORIZONTAL SYNCHRONIZING (HP) SIGNAL CIRCUIT
DescriptionINFOID:0000000001696117
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:0000000001696118
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-164, "Removal and Installation".
NO >> Replace display unit. Refer to AV-166, "
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: March 2010
2008 QX56

AV
VERTICAL SYNCHRONIZING (VP) SIGNAL CIRCUITAV-79
< 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:0000000001696119
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:0000000001696120
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-164, "Removal and Installation".
NO >> Replace display unit. Refer to AV-166, "
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: March 2010
2008 QX56