Air INFINITI QX56 2004 Factory Service Manual

AV-122
NAVIGATION SYSTEM
Revision: August 20072004 QX56
Vehicle Speed Signal Check for Display Control UnitEKS007M4
1. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display control unit connector, combination meter connector, NAVI control unit connector and
shift lock control unit connector.
3. Check continuity between display control unit harness connector
M94 terminal 16 (W/R) and combination meter harness connec-
tor M24 terminal 29 (W/R).
4. Check continuity between display control unit harness connector
M94 terminal 16 (W/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness.
2. CHECK 1: VEHICLE SPEED SIGNAL
1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector
M94 terminal 16 (W/R) and ground.
OK or NG
OK >> GO TO 3.
NG >> Replace display control unit. Refer to AV- 1 5 8 , "
Removal
and Installation of Display Control Unit" .
3. CHECK 2: VEHICLE SPEED SIGNAL
1. Connect combination meter connector, NAVI control unit connector and shift lock control unit connector.
2. Drive vehicle at a constant speed.
3. Check signal between display control unit harness connector
M94 terminal 16 (W/R) and ground with CONSULT-ll or oscillo-
scope.
OK or NG
OK >> Replace display control unit. Refer to AV- 1 5 8 , "Removal
and Installation of Display Control Unit" .
NG >> Check combination meter system. Refer to DI-19, "
Vehi-
cle Speed Signal Inspection" . Continuity should exist.
Continuity should not exist.
WKIA1506E
Approx. 3.5V or more
SKIA4297E
16 (W/R) – Ground : Refer to AV- 9 2 , "Terminals
and Reference Value for Dis-
play Control unit" .
SKIA4616E

NAVIGATION SYSTEM
AV-125
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MA
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AV
Revision: August 20072004 QX56
2. CHECK REVERSE SIGNAL
With the selector lever in R-position, check voltage between display
control unit and ground.
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal
and Installation of Display Control Unit" .
NG >> Check harness for open or short between display control unit and back-up lamp position relay.
AV Communication Line Check (Between Display Control Unit and NAVI Control
Unit)
EKS007MB
1. CHECK POWER SUPPLY AND GROUND CIRCUIT
1. Check power supply and ground circuit for NAVI control unit. Refer to AV- 11 6 , "
Power Supply and Ground
Circuit Check for NAVI Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector and display control unit connector.
3. Check continuity between NAVI control unit and display control unit.
4. Check continuity between NAVI control unit and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
Te r m i n a l s
Selector lever position
(+)
(–)
ConnectorTe r m i n a l
(Wire color)R-positionOther than
R-position
M94 6 (GR) Ground Battery voltage Approx. 0V
SKIA4303E
Te r m i n a l s
Continuity NAVI control unit Display control unit
ConnectorTe r m i n a l
(Wire color)ConnectorTerminal
(Wire color)
B15244 (L)
M9532 (L)
Ye s
45 (P) 34 (P)
Te r m i n a l s
Continuity NAVI control unit
—
Connector Terminal (Wire color)
B15244 (L)
Ground No
45 (P)
SKIA4444E

AV-126
NAVIGATION SYSTEM
Revision: August 20072004 QX56
3. CHECK SELF-DIAGNOSIS OF DCU
1. Replace NAVI control unit.
2. Connect NAVI control unit connector and display control unit connector.
3. Turn ignition switch ON.
4. Start self-diagnosis of DCU and check the self-diagnosis result.
OK or NG
OK >> Inspection End.
NG >> Replace display control unit. Refer to AV- 1 5 8 , "
Removal and Installation of Display Control Unit" .
Audio Communication Line Check (Between Display Control Unit and Audio
Unit)
EKS007MC
1. CHECK POWER SUPPLY AND GROUND CIRCUIT
1. Check system of power supply and ground circuit audio unit. Refer to AV- 3 0 , "
Power Supply Circuit
Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect audio unit connector and display control unit connector.
3. Check continuity between audio unit and display control unit.
4. Check continuity between display control unit and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
Te r m i n a l s
Continuity Display control unit Audio unit
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
M9540 (O/L)
M4565 (O/L)
Ye s
42 (W/L) 66 (W/L)
Te r m i n a l s
Continuity Display control unit
—
Connector Terminal (Wire color)
M9540 (O/L)
Ground No
42 (W/L)
WKIA1192E

AV-128
NAVIGATION SYSTEM
Revision: August 20072004 QX56
6. CHECK 4: AUDIO-RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector
M95 terminal 42 (W/L) and ground with CONSULT-ll or oscillo-
scope.
OK or NG
OK >> Inspection End.
NG >> Replace audio unit. Refer to AV- 4 5 , "
Removal and
Installation for Audio Unit" .
Display Communication Line Check (Between Display Control Unit and Display
Unit)
EKS007MD
1. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display unit connector and display control unit connector.
3. Check continuity between display control unit and display unit.
4. Check continuity between display control unit and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK 1: COMMUNICATION SIGNAL (DCU–DSP)
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 ter-
minal 11 (B/W) and ground.
OK or NG
OK >> GO TO 3.
NG >> Replace display unit. Refer to AV- 1 5 8 , "
Removal and
Installation of Display Unit" . 42 (W/L) - Ground : Refer to AV-92, "
Te r m i na l s
and Reference Value for Dis-
play Control unit" .
SKIA4448E
Te r m i n a l s
Continuity Display control unit Display unit
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
M9536 (B/W)
M9311 (B/W)
Ye s
38 (L) 22 (L)
Te r m i n a l s
Continuity Display control unit
—
Connector Terminal (Wire color)
M9536 (B/W)
Ground No
38 (L)
WKIA2019E
Approx. 3.5V or more.
WKIA1377E

AV-130
NAVIGATION SYSTEM
Revision: August 20072004 QX56
AV Communication Line Check (Between Display Control Unit and AV Switch)EKS007ME
1. CHECK AV SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display control unit connector and AV switch connector.
3. Check continuity between display control unit and AV switch.
4. Check continuity between display control unit and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK SELF-DIAGNOSIS OF DCU
1. Replace AV switch.
2. Connect display control unit connector and AV switch connector.
3. Turn ignition switch ON.
4. Start self-diagnosis of DCU and check the self-diagnosis result.
OK or NG
OK >> Inspection End.
NG >> Replace display control unit. Refer to AV- 1 5 8 , "
Removal and Installation of Display Control Unit" .
Te r m i n a l s
Continuity Display control unit AV switch
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
M9528 (V)
M986 (V)
Ye s
30 (LG) 8 (LG)
Te r m i n a l s
Continuity Display control unit
—
Connector Terminal (Wire color)
M9528 (V)
Ground No
30 (LG)
WKIA1597E

AV-132
NAVIGATION SYSTEM
Revision: August 20072004 QX56
2. CHECK 2: DVD-ROM
1. Check DVD-ROM for dirt, scratches and warpage.
OK or NG
OK >> GO TO 3.
NG >> Replace DVD-ROM map.
3. CHECK 3: DVD-ROM
1. Insert same DVD-ROM to make sure same diagnosis result is found as last self-diagnosis.
OK or NG
OK >> Replace NAVI control unit. Refer to AV- 1 5 7 , "Removal and Installation of NAVI Control Unit" .
NG >> Replace DVD-ROM map.
If Connection Between NAVI Control Unit and GPS Antenna is MalfunctioningEKS007MI
1. CHECK GPS ANTENNA
1. Check cable for GPS antenna for damage.
OK or NG
OK >> GO TO 2.
NG >> Replace GPS antenna. Refer to AV- 1 5 7 , "
Removal and Installation of GPS Antenna" .
2. CHECK BY REPLACEMENT OF GPS ANTENNA
1. Replace other functional GPS antenna to try self-diagnosis again.
Result of self-diagnosis; Found same result?
Yes >> Replace NAVI control unit. Refer to AV- 1 5 7 , "Removal and Installation of NAVI Control Unit" .
No >> Replace GPS antenna. Refer to AV- 1 5 7 , "
Removal and Installation of GPS Antenna" .
Operating Screen for Audio and A/C is Not Displayed When Showing NAVI
Screen
EKS007MJ
1. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display control unit connector and display unit connector.
3. Check continuity between display control unit harness connector M95 terminal 49, 51 (B), 53 (W), 55 (R)
and display unit harness connector M93 terminal 21, 9 (B), 20 (W), 8 (R).
4. Check continuity between display control unit harness connector
M95 terminal 49, 51 (B), 53 (W), 55 (R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness.Continuity should exist.
Continuity should not exist.
WKIA1965E

AV-134
NAVIGATION SYSTEM
Revision: August 20072004 QX56
Color of RGB Image is Not Proper (Only NAVI Screen Looks Bluish)EKS007MK
1. CHECK RGB HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector and display control unit connector.
3. Check continuity between NAVI control unit and display control unit.
4. Check continuity between NAVI control unit and ground.

When the screen looks bluish.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK RGB SIGNAL
1. Connect NAVI control unit connector and display control unit connector.
2. Turn ignition switch ON.
3. Display “Color bar” by “CONFIRMATION/ADJUSTMENT” mode.
4. Check signal between NAVI control unit connector B151 termi-
nal 18 (R) and 17 with CONSULT-ll or oscilloscope.

When the screen looks bluish.
Voltage signal between NAVI control unit connector B151 termi-
nal 18 (R) and 17.
OK or NG
OK >> Replace display control unit. Refer to AV- 1 5 8 , "Removal
and Installation of Display Control Unit" .
NG >> Replace NAVI control unit. Refer to AV- 1 5 7 , "
Removal and Installation of NAVI Control Unit" .
Te r m i n a l s
Continuity NAVI control unit Display control unit
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
B15118 (R)
M9544 (R/L)
Ye s
17 45
Te r m i n a l s
Continuity NAVI control unit
—
Connector Terminal (Wire color)
B15118 (R)
Ground No
17
SKIA4349E
18 (R) – 17 : Refer to AV- 9 0 , "Te r m i n a l s
and Reference Value for
NAVI Control unit" .
SKIA4629E

NAVIGATION SYSTEM
AV-135
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AV
Revision: August 20072004 QX56
Color of RGB Image is Not Proper (Only NAVI Screen Looks Reddish)EKS007ML
1. CHECK RGB HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector and display control unit connector.
3. Check continuity between NAVI control unit and display control unit.
4. Check continuity between NAVI control unit and ground.

When the screen looks reddish.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK RGB SIGNAL
1. Connect NAVI control unit connector and display control unit connector.
2. Turn ignition switch ON.
3. Display ″Color bar″ by ″CONFIRMATION/ADJUSTMENT″ mode.
4. Check signal between NAVI control unit connector B151 termi-
nal 21 (R/W) and 17 with CONSULT-ll or oscilloscope.

When the screen looks reddish.
Voltage signal between NAVI control unit connector B151 termi-
nal 21 (R/W) and 17.
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal
and Installation of Display Control Unit" .
NG >> Replace NAVI control unit. Refer to AV-157, "
Removal and Installation of NAVI Control Unit" .
Te r m i n a l s
Continuity NAVI control unit Display control unit
ConnectorTe r m i n a l
(Wire color)ConnectorTerminal
(Wire color)
B15121 (R/W)
M9546 (R/W)
Ye s
17 45
Te r m i n a l s
Continuity NAVI control unit
—
Connector Terminal (Wire color)
B15121 (R/W)
Ground No
17
SKIA4350E
21 (R/W) – 17 : Refer to AV-90, "Te r m i na l s
and Reference Value for
NAVI Control unit" .
SKIA4630E

AV-136
NAVIGATION SYSTEM
Revision: August 20072004 QX56
Color of RGB Image is Not Proper (Only NAVI Screen Looks Yellowish)EKS007MM
1. CHECK RGB HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector and display control unit connector.
3. Check continuity between NAVI control unit and display control unit.
4. Check continuity between NAVI control unit and ground.

When the screen looks yellowish.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK RGB SIGNAL
1. Connect NAVI control unit connector and display control unit connector.
2. Turn ignition switch ON.
3. Display ″Color bar″ by ″CONFIRMATION/ADJUSTMENT″ mode.
4. Check signal between NAVI control unit connector B151 termi-
nal 15 (B) and 17 with CONSULT-ll or oscilloscope.

When the screen looks yellowish.
Voltage signal between NAVI control unit connector B151 termi-
nal 15 (B) and 17.
OK or NG
OK >> Replace display control unit. Refer to AV- 1 5 8 , "Removal
and Installation of Display Control Unit" .
NG >> Replace NAVI control unit. Refer to AV- 1 5 7 , "
Removal and Installation of NAVI Control Unit" .
Te r m i n a l s
Continuity NAVI control unit Display control unit
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
B15115 (B)
M9548 (B)
Ye s
17 45
Te r m i n a l s
Continuity NAVI control unit
—
Connector Terminal (Wire color)
B15115 (B)
Ground No
17
SKIA4351E
15 (B) – 17 : Refer to AV- 9 0 , "Te r m i n a l s
and Reference Value for
NAVI Control unit" .
SKIA4631E

NAVIGATION SYSTEM
AV-137
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AV
Revision: August 20072004 QX56
Color of RGB Image is Not Proper (All Screen Looks Bluish)EKS007MN
1. CHECK RGB HARNESS
1. Turn ignition switch OFF.
2. Disconnect display control unit connector and display unit connector.
3. Check continuity between display control unit and display unit.
4. Check continuity between display control unit and ground.

When the screen looks bluish.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK RGB SIGNAL
1. Connect display control unit connector and display unit connector.
2. Turn ignition switch ON.
3. Display “Color bar” by “CONFIRMATION/ADJUSTMENT” mode.
4. Check the following with CONSULT-ll or oscilloscope.

When the screen looks bluish.
Voltage signal between display control unit connector M95 ter-
minal 50 (R/L) and 47.
OK or NG
OK >> Replace display unit. Refer to AV-158, "Removal and
Installation of Display Unit" .
NG >> Replace display control unit. Refer to AV-158, "
Removal and Installation of Display Control Unit" .
Te r m i n a l s
Continuity Display control unit Display unit
ConnectorTe r m i n a l
(Wire color)ConnectorTerminal
(Wire color)
M9550 (R/L)
M9317 (R/L)
Ye s
47 7
Te r m i n a l s
Continuity Display control unit
—
Connector Terminal (Wire color)
M9550 (R/L)
Ground No
47
SKIA4353E
50 (R/L) – 47 : Refer to AV-92, "Te r m i na l s
and Reference Value for Dis-
play Control unit" .
SKIA4697E