2004 INFINITI QX56 ECU

TROUBLE DIAGNOSIS
ATC-33
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AT C
Revision: August 20072004 QX56
TROUBLE DIAGNOSISPFP:00004
CONSULT-II Function (BCM)EJS002C4
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II BASIC OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn the
ignition switch ON.
2. Touch “START (NISSAN BASED VHCL)”.
3. Touch “BCM” on “SELECT SYSTEM” screen. If “BCM” is not
indicated, go to GI-39, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
BCM diagnostic
test itemDiagnostic mode Description
Inspection by partWORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
BBIA0369E
BCIA0029E
BCIA0030E

CONTROL UNIT
ATC-135
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AT C
Revision: August 20072004 QX56
CONTROL UNITPFP:27500
Removal and InstallationEJS002CW
FRONT AIR CONTROL
Removal
1. Remove the five control knobs from the front air control unit.
2. Remove the cluster lid C. Refer to IP-12, "
Cluster Lid C" .
3. Remove the four screws securing the front air control unit to
cluster lid C.
4. Remove the front air control unit.
Installation
Installation is in the reverse order of removal.
REAR AIR CONTROL
Removal
1. Remove the overhead console from the headliner. Refer to EI-37, "HEADLINING" .
2. Remove the four screws and remove the rear air control.
Installation
Installation is in the reverse order of removal.
LJIA0130E
LJIA0131E

IN-CABIN MICROFILTER
ATC-143
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AT C
Revision: August 20072004 QX56
5. Install the in-cabin microfilter cover.
6. Install the lower glove box in the instrument panel and secure it
with the two hinge pins.
LJIA0134E
WLIA0027E

AV-148
NAVIGATION SYSTEM
Revision: August 20072004 QX56
Example of Symptoms Judged Not MalfunctionEKS007NA
BASIC OPERATION
VEHICLE MARK
Symptom Cause Remedy
No image is shown. Display brightness adjustment is set fully to
DARK side.Adjust the display brightness.
No guide sound is heard.
Audio guide volume is too low or
too high.Volume control is set to OFF, MIN or MAX. Adjust the audio guide volume.
Audio guidance is not available while the vehicle
is driving on a dark pink route.System is not malfunctioning.
Screen is too dark.
Motion of the image is too slow.Temperature inside the vehicle is low. Wait until the temperature inside the vehicle
reaches the proper temperature.
Small black or bright spots appear
on the screen.Symptom peculiar to a liquid crystal display (dis-
play unit).System is not malfunction.
Symptom Cause Remedy
Map screen and BIRDVIEW™
Name of the place varies with the
screen.Some thinning of the character data is done to
prevent the display becoming to complex. In
some cases and in some locations, the display
contents may differ.
The same place name, street name, etc. may not
be displayed every time on account of the data
processing.System is not malfunctioning.
Vehicle mark is not positioned cor-
rectly.Vehicle is transferred by ferry or by towing after its
ignition switch is turned to OFF.Drive the vehicle for a while in the GPS sat-
ellite signal receiving condition.
Screen will not switch to nighttime
mode after the lighting switch is
turned ON.The daytime screen is selected by the “SWITCH
SCREENS” when the last time the screen dim-
ming setting is done.
Switching between daytime/nighttime screen may
be inhibited by the automatic illumination adjust-
ment function.Perform screen dimming and select the
nighttime screen by “SWITCH SCREENS”.
Map screen will not scroll in accor-
dance with the vehicle travel.Current location is not displayed. Press “MAP” button to display the current
location.
Vehicle mark will not be shown. Current location is not displayed. Press “MAP” button to display the current
location.
Accuracy indicator (GPS satellite
mark) on the map screen stays
gray.GPS satellite signal is intercepted because the
vehicle is in or behind a building.Move the vehicle out to an open space.
GPS satellite signal cannot be received because
an obstacle is placed on top of the instrument
panel.Do not place anything in the center on top of
the display.
GPS satellites are not visible from current loca-
tion.Wait until GPS satellites are visible by mov-
ing the vehicle.
Vehicle location accuracy is low. Accuracy indicator (GPS satellite mark) on the
map screen stays gray.Current location is not determined.
Vehicle speed setting by the vehicle speed pulse
has been deviated (advanced or retarded) from
the actual vehicle speed because tire chain is fit-
ted or the system has been used on another vehi-
cle.Drive the vehicle for a while [for approx. 30
minutes at approx. 30 km/h (19 MPH)] and
the deviation will be automatically adjusted.
If advancement or retard still occur, perform
the distance adjustment by CONFIRMA-
TION/ADJUSTMENT mode of diagnosis
function.
Map data has error or omission. (Vehicle mark is
always deviated to the same position.)As a rule, an updated map DVD–ROM will
be released once a year.

BCM (BODY CONTROL MODULE)
BCS-7
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BCS
Revision: August 20072004 QX56

BCM is activated with low current consumption mode.

CAN communication is not active.

When CAN communication operation is detected, it switches to CAN communication status.

When a state of the following switches changes, it switches to CAN communication state:
–Key switch
–Hazard switch
–Door lock/unlock switch
–Front door switch (LH, RH)
–Rear door switch (LH, RH)
–Back door switch
–Combination switch (passing, lighting switch 1st position, front fog lamp)
–Keyfob (lock/unlock signal)
–Door lock assembly LH (key cylinder switch)

When control performed only by BCM is required by switch, it shifts to CAN communication inactive
mode.

Status of combination switch reading function is changed.
SYSTEMS CONTROLLED BY BCM DIRECTLY

Power door lock system. Refer to BL-16, "POWER DOOR LOCK SYSTEM" .

Remote keyless entry system. Refer to BL-44, "REMOTE KEYLESS ENTRY SYSTEM" .

Power window system. Refer to GW-15, "POWER WINDOW SYSTEM" . NOTE

Sunroof system. Refer to RF-10, "SUNROOF" . NOTE

Room lamp timer. Refer to LT- 1 2 9 , "INTERIOR ROOM LAMP" .

Warning chime system. Refer to DI-43, "WARNING CHIME" .

Turn signal and hazard warning lamps system. Refer to LT-80, "TURN SIGNAL AND HAZARD WARNING
LAMPS" .
NOTE:
Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R

Panic system. Refer to BL-44, "REMOTE KEYLESS ENTRY SYSTEM" .

Theft warning system. Refer to BL-75, "VEHICLE SECURITY (THEFT WARNING) SYSTEM" .

IVIS (NATS) system. Refer to BL-138, "IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)" .

Headlamp, daytime light, fog lamp, tail lamp, auto light and battery saver control systems. Refer to LT- 6 ,
"HEADLAMP (FOR USA)" , LT-34, "HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -" , LT-69,
"FRONT FOG LAMP" , LT- 1 0 8 , "PARKING, LICENSE PLATE AND TAIL LAMPS" , or LT- 4 7 , "AUTO
LIGHT SYSTEM" .

Front wiper and washer system. Refer to WW-4, "FRONT WIPER AND WASHER SYSTEM" .

Rear wiper and washer system. Refer to WW-33, "REAR WIPER AND WASHER SYSTEM" .

Rear window defogger system. Refer to GW-78, "REAR WINDOW DEFOGGER" .
MAJOR COMPONENTS AND CONTROL SYSTEM
System Input Output
Remote keyless entry system Keyfob

All-door locking actuator

Back door opener actuator

Turn signal lamp (LH, RH)
Power door lock system

Front power door lock/unlock
switch (LH, RH)

All door switch

Key switchAll-door locking actuator
Power supply (IGN) to power window and
sunroofIgnition power supply Power supply to power window and sunroof system

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

BCM (BODY CONTROL MODULE)
BCS-11
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BCS
Revision: August 20072004 QX56
CONSULT-II Function (BCM)EKS007GH
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With ignition switch OFF, connect CONSULT-II and CONSULT-II
CONVERTER to data link connector and turn ignition switch ON.
2. Touch “START (NISSAN BASED VHCL)”.
3. Touch “BCM” on “SELECT SYSTEM” screen.
If "BCM" is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
BCM diagnostic
test itemDiagnostic mode Content
Inspection by partWORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
BBIA0369E
BCIA0029E
BCIA0030E

BCS-12
BCM (BODY CONTROL MODULE)
Revision: August 20072004 QX56
4. Select item to be diagnosed on “SELECT TEST ITEM” screen.
ITEMS OF EACH PART
NOTE:
CONSULT-II will only display systems the vehicle possesses.
WORK SUPPORT
Operation Procedure
1. Touch "BCM" on "SELECT TEST ITEM" screen.
2. Touch "WORK SUPPORT" on "SELECT DIAG MODE" screen.
3. Touch "RESET SETTING VALUE" on "SELECT WORK ITEM" screen.
4. Touch "START".
5. "RESET SETTING VALUE OK?" is displayed, and touch "YES".
6. The setting will be changed and "COMPLETED" will be displayed.
7. Touch "END".
LKIA0183E
System and itemCONSULT-II
displayDiagnostic test mode (Inspection by part)
WORK
SUPPORTSELF−DIAG
RESULTSCAN DIAG
SUPPORT
MNTRDATA
MONITORECU
PA R T
NUMBERACTIVE
TESTCONFIG-
URA-
TION
BCM BCM×× × × ×
Power door lock sys-
temDOOR LOCK×××
Rear defoggerREAR
DEFOGGER××
Warning chime BUZZER××
Room lamp timer INT LAMP×××
Remote keyless
entry systemMULTI
REMOTE ENT×××
Headlamp HEAD LAMP×××
Wiper WIPER××
Turn signal lamp
Hazard lampFLASHER××
Blower fan switch
signal
Air conditioner
switch signalAIR
CONDITIONER×
Combination switch COMB SW×
IVIS (NATS) IMMU××
Interior lamp battery
saverBATTERY
SAVER×××
Back door BACK DOOR××
Retained power con-
trolRETAINED
PWR×××