2004 INFINITI QX56 Meter

AT-192
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
4. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect the A/T assembly harness connector.
3. Check the continuity between A/T assembly harness connector
(vehicle side) 5 (B), 10 (B) and ground. Refer to AT - 5 2 , "
Wiring
Diagram — AT —" .
4. If OK, check the harness for short-circuit to ground or the power
source.
OK or NG
OK >> GO TO 5.
NG >> Repair the open or short circuit in the harness or con-
nector.
5. CHECK AT CHECK INDICATOR LAMP CIRCUIT
1. Turn ignition switch “OFF”.
2. Check the combination meter.
Refer to DI-17, "
How to Proceed With Trouble Diagnosis" .
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Engine Cannot Be Started In “P” or “N” PositionUCS002IJ
SYMPTOM:

Engine cannot be started with selector lever in “P” or “N” position.

Engine can be started with selector lever in “D”or “R” position.
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to AT- 9 3 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnosis results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT-109, "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" .
NO >> GO TO 2.
2. CHECK CONTROL CABLE
Check the control cable.

Refer to AT-234, "Checking of A/T Position" .
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to AT-234, "
Adjustment of A/
T Position" .
SCIA2106E
LCIA0324E

NAVIGATION SYSTEM
AV-101
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Revision: August 20072004 QX56
On Board Self-Diagnosis FunctionEKS007LT
DESCRIPTION

Diagnosis function consists of the self-diagnosis mode performed automatically and the CONFIRMATION/
ADJUSTMENT mode operated manually.

Self-diagnosis mode checks for connections between the units constituting this system, analyzes each
individual unit at the same time, and displays the results on the LCD screen.

CONFIRMATION/ADJUSTMENT mode is used to perform trouble diagnosis that require operation and
judgment by an operator (trouble that cannot be automatically judged by the system), to check/change the
set value, and to display the History of Errors of the navigation system.
DIAGNOSIS ITEM
NOTE:
Make the status that is set by D/N function be shown.
Self-Diagnosis Mode (DCU)EKS007LU
OPERATION PROCEDURE
1. Start the engine.
2. Turn the audio system off.
Mode Description
Self-diagnosis (DCU) Display control unit diagnosis.
Self-diagnosis (NAVI)

NAVI Control unit diagnosis (DVD-ROM drive) will not be diagnosed
when no map DVD-ROM is in it.

Analyzes connection between the NAVI control unit and the GPS
antenna and operation of each unit.
CONFIRMATION/
ADJUSTMENTDisplay diagnosisIn display control unit mode, color tone and shading of the screen can be
checked by the display of a color bar and a gray scale.
Vehicle signalsIn display control unit mode, analyzes the following vehicle signals: Vehi-
cle speed signal, light signal
NOTE , ignition switch signal, and reverse sig-
nal.
Auto Climate Control A/C self-diagnosis of A/C system.
NavigationDisplay diagnosisIn NAVI C/U mode, color tone and shading of the screen can be checked
by the display of a color bar and a gray scale.
Vehicle signalsIn NAVI C/U mode, analyzes the following vehicle signals: Vehicle speed
signal, light signal, ignition switch signal, and reverse signal.
History of ErrorsDiagnosis results previously stored in the memory (before turning ignition
switch ON) are displayed in this mode. Time and location when/where the
errors occurred are also displayed.
Naviga-
tionDisplay Lon-
gitude & Lat-
itudeDisplay the map. Use the joystick to adjust position. Longitude and latitude
will be displayed.
Speed Cali-
brationUnder ordinary conditions, the navigation system distance measuring
function will automatically compensate for minute decreases in wheel and
tire diameter caused by tire wear or low-pressure. Speed calibration imme-
diately restores system accuracy in cases such as when distance calibra-
tion is needed because of the use of tire chains in inclement weather.
Angle
adjustmentCorrects difference between actual turning angle of a vehicle and turning
angle of the car mark on the display.
Initialize
LocationThis mode is for initializing the current location. Use when the vehicle is
transported a long distance on a trailer, etc.
CAN DIAG SUPPORT MONITOR Display status of CAN communication.

NAVIGATION SYSTEM
AV-121
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Revision: August 20072004 QX56
Vehicle Speed Signal Check for NAVI Control UnitEKS007M3
1. CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector, combination meter connector, display control unit connector and
shift lock control unit connector.
3. Check continuity between NAVI control unit harness connector
B152 terminal 28 (W/R) and combination meter harness con-
nector M24 terminal 29 (W/R).
4. Check continuity between NAVI control unit harness connector
B152 terminal 28 (W/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness.
2. CHECK 1: VEHICLE SPEED SIGNAL
1. Connect NAVI control unit connector.
2. Turn ignition switch ON.
3. Check voltage between NAVI control unit harness connector
B152 terminal 28 (W/R) and ground.
OK or NG
OK >> GO TO 3.
NG >> Replace NAVI control unit. Refer to AV-157, "
Removal
and Installation of NAVI Control Unit" .
3. CHECK 2: VEHICLE SPEED SIGNAL
1. Connect combination meter connector, display control unit connector and shift lock control unit connector.
2. Drive vehicle at a constant speed.
3. Check signal between NAVI control unit harness connector
B152 terminal 28 (W/R) and ground with CONSULT-ll or oscillo-
scope.
OK or NG
OK >> Replace NAVI control unit. Refer to AV-157, "Removal
and Installation of NAVI Control Unit" .
NG >> Check combination meter system. Refer to DI-19, "
Veh i-
cle Speed Signal Inspection" . Continuity should exist.
Continuity should not exist.
WKIA1769E
Approx. 3.5V or more
SKIA4295E
28 (W/R) – Ground : Refer to AV-90, "Terminals
and Reference Value for NAVI
Control unit" .
SKIA4615E

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

AV-144
NAVIGATION SYSTEM
Revision: August 20072004 QX56
Distance to Empty Displayed is Not Shown (“ *** ” is Shown)EKS007MY
1. CHECK SPEEDOMETER
Confirm that speedometer is functioning.
Is speedometer functioning?
YES >> GO TO 2.
NO >> Refer to DI-19, "
Vehicle Speed Signal Inspection" .
2. CHECK FUEL GAUGE
Confirm that fuel gauge is functioning.
Is fuel gauge functioning?
YES >> GO TO 3.
NO >> Refer to DI-22, "
Fuel Level Sensor Unit Inspection" .
3. CHECK CAN COMMUNICATION LINE
Check CAN communication line. Refer to AV-131, "
CAN Communication Line Check" .
OK or NG
OK >> Replace display control unit. Refer to AV- 1 5 8 , "Removal and Installation of Display Control Unit" .
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
Driving Distance or Average Speed Displayed is Not Shown (“ *** ” is Shown)EKS007MZ
1. CHECK IGNITION SIGNAL
Check ignition signal. Refer to AV-124, "
Ignition Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
2. CHECK VEHICLE SPEED SIGNAL
Check vehicle speed signal. Refer to AV- 1 2 2 , "
Vehicle Speed Signal Check for Display Control Unit" .
OK or NG
OK >> Replace display control unit. Refer to AV- 1 5 8 , "Removal and Installation of Display Control Unit" .
NG >> Check the malfunctioning parts.
WARNING DOOR OPEN Screen is Not ShownEKS007N0
1. CHECK IGNITION SIGNAL
Check ignition signal. Refer to AV-124, "
Ignition Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK VEHICLE SPEED SIGNAL
Check vehicle speed signal. Refer to AV- 1 2 2 , "
Vehicle Speed Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 3.
NG >> Check the malfunctioning parts.

NAVIGATION SYSTEM
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Driving TestEKS007N9
1. DRIVING TEST 1
1. Scroll the map screen to display the area to make correction. Press “ENTER” and select “CURRENT
LOCATION CORRECTION”.
2. Correct direction of the vehicle mark.
3. Perform the distance correction of the CONFIRMATION/ADJUSTMENT mode.
Note: Normally, adjustment is not necessary because this system has automatic distance correction func-
tion. However, when a tire chain is fitted, adjustment in accordance with the tire diameter ratio must be
made.
4. Are symptoms malfunctioning to the AV-148, "
Example of Symptoms Judged Not Malfunction" present
after driving the vehicle?
YES or NO
YES >> Limit of the location detection capacity of the navigation system.
NO >> GO TO 2.
2. DRIVING TEST 2

Did any malfunction occur when the proper test in the following test patterns is performed?

Test pattern
Driving test finds the difference between the symptoms monitored with and without each sensor.
–Test pattern 1: Test method with no GPS location correction
Disconnect GPS antenna connector (GT5) connected to the NAVI control unit. Accurately adjust the cur-
rent location and the direction, then drive the vehicle.
–Test pattern 2: Test method with no map-matching
Accurately adjust the current location and the direction. Eject the map DVD-ROM from the NAVI control
unit with ignition switch turned to OFF, then drive the vehicle. After driving, insert the map DVD-ROM back
in the unit, display the track of the vehicle on the map screen and compare it with the actual road configu-
ration.

Sample tests
– matching or by GPS>
Perform test pattern 1.
–
Perform test pattern 1 & 2.
Compare the track of the vehicle on the map screen and the actual road configuration. For fairly accurate
tracking, plotting shall be made every several hundred meters (feet).
–
Perform test pattern 1 & 2.
Drive on a road of which distance is accurately known (by utilizing distance posts on a highway). Calculate
the rate of change (increased/decreased) of the distance by comparing with the actual distance.
Correction = A/B
A: Distance shown on the screen
B: Actual distance
YES or NO
YES >>
If adjustment is insufficient, perform adjustment again.

If any error is found in the map, please contact map data supplier. Refer to Navigation System
Owner's Manual for contact information.

Replace NAVI control unit. Refer to AV-157, "Removal and Installation of NAVI Control Unit" .
NO >> Limit of the location detection capacity of the navigation system.

BCS-6
BCM (BODY CONTROL MODULE)
Revision: August 20072004 QX56

When BCM is in sleep mode, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low-cur-
rent-consumption mode. OUTPUTS (2, 3, and 4) turn ON-OFF at 60 ms intervals, and receives lighting
switch input only.
CAN COMMUNICATION CONTROL
CAN communication allows a high rate of information through the two communication lines (CAN-L, CAN-H)
connecting the various control units in the system. Each control unit transmits/receives data, but selectively
reads required data only.
BCM STATUS CONTROL
BCM changes its status depending on the operation status in order to save power consumption.
1. CAN communication status

With ignition switch ON, CAN communicates with other control units normally.

Control by BCM is being operated properly.

When ignition switch is OFF, switching to sleep mode is possible.

Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is
active, CAN communication status is active.
2. Sleep transient status

This status shuts down CAN communication when ignition switch is turned OFF.

It transmits sleep request signal to IPDM E/R and combination meter.

Two seconds after CAN communication of all control units stops, CAN communication switches to inac-
tive status.
3. CAN communication inactive status

With ignition switch OFF, CAN communication is not active.

With ignition switch OFF, control performed only by BCM is active.

Three seconds after CAN communication of all control units stops, CAN communication switches to
inactive status.
4. Sleep status
WKIA4093E

BCS-8
BCM (BODY CONTROL MODULE)
Revision: August 20072004 QX56
CAN Communication System DescriptionEKS007GF
Refer to LAN-5, "CAN COMMUNICATION" .
Power supply (BAT) to power window and
sunroofBattery power supply Power supply to power window and sunroof system
Panic alarm

Key switch

KeyfobIPDM E/R
Auto light system

Auto light sensor

Combination switchIPDM E/R
Battery saver control

Ignition switch

Combination switch

Front door switch LH

Front door switch RHIPDM E/R
Headlamp Combination switch IPDM E/R
Tail lamp Combination switch IPDM E/R
Fog lamp Combination switch IPDM E/R
Turn signal lamp Combination switch

Turn signal lamp

Combination meter
Hazard lamp Hazard switch

Turn signal lamp

Combination meter
Room lamp timer

Key switch

Keyfob

Main power window and door
lock/unlock switch

Front door lock assembly LH
(key cylinder switch)

All door switchInterior room lamp
Key warning chime

Key switch

Front door switch LHCombination meter (warning buzzer)
Light warning chime

Combination switch

Key switch

Front door switch LHCombination meter (warning buzzer)
Vehicle-speed-sensing intermittent wiper

Combination switch

Combination meterIPDM E/R
Rear window defogger Rear window defogger switch IPDM E/R
Air conditioner switch signal Front air control ECM
Blower fan switch signal Front air control ECM
Low tire pressure warning system Remote keyless entry receiver

Combination meter

Display control unit
Trailer tow Combination switch Trailer turn signal lamp
Vehicle security system

Remote keyless entry receiver
(Keyfob)

Main power window and door
lock/unlock switch

Power window and door lock/
unlock switch RH

Front door lock assembly LH
(key cylinder switch)

All door switch

Glass hatch ajar switch

IPDM E/R

Security indicator lamp System Input Output