2004 INFINITI QX56 Can communication

NAVIGATION SYSTEM
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AV
Revision: August 20072004 QX56
CAN Communication Line CheckEKS007MF
1. CHECK MONITOR DESCRIPTION
1. Start display control unit self-diagnosis. Refer to AV- 1 0 1 , "
Self-Diagnosis Mode (DCU)" .
2. Select “CAN DIAG SUPPORT MONITOR”. Refer to AV- 11 4 ,
"CAN DIAG SUPPORT MONITOR" .
3. Record each item display description (OK/NG/UKNWN) displayed on the following CAN DIAG SUPPORT
MONITOR Check Sheet.
CAN DIAG SUPPORT MONITOR Check Sheet
>> After filling in CAN DIAG SUPPORT MONITOR Check Sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
If NAVI Control Unit Detects That DVD-ROM Map is Not InsertedEKS007MG
1. CHECK DVD-ROM
1. Make sure identified DVD-ROM map is inserted.
OK or NG
OK >> Replace NAVI control unit. Refer to AV-157, "Removal and Installation of NAVI Control Unit" .
NG >> Insert identified DVD-ROM map.
If NAVI Control Unit Detects That Inserted DVD-ROM Map Malfunctioning or If It
is Impossible to Load Data from DVD-ROM Map
EKS007MH
1. CHECK 1: DVD-ROM
1. Remove inserted DVD-ROM map to check that it is identified.
OK or NG
OK >> GO TO 2.
NG >> Replace identified DVD-ROM map.
Item content
Error counter
Normal condition Error (Example)
CAN_COMM OK NG 0-50
CAN_CIRC_1 OK UNKWN 0-50
CAN_CIRC_2 OK UNKWN 0-50
CAN_CIRC_3 OK UNKWN 0-50
CAN_CIRC_4 OK UNKWN 0-50
CAN_CIRC_5 OK UNKWN 0-50
CAN_CIRC_6 OK UNKWN 0-50
CAN_CIRC_7 OK UNKWN 0-50
CAN_CIRC_8 OK UNKWN 0-50
CAN_CIRC_9 OK UNKWN 0-50
SKIA4288E
Diagnosis item Screen display Diagnosis item Screen display
CAN_COMM OK NG CAN_CIRC_5 OK UNKWN
CAN_CIRC_1 OK UNKWN CAN_CIRC_6 OK UNKWN
CAN_CIRC_2 OK UNKWN CAN_CIRC_7 OK UNKWN
CAN_CIRC_3 OK UNKWN CAN_CIRC_8 OK UNKWN
CAN_CIRC_4 OK UNKWN CAN_CIRC_9 OK UNKWN

NAVIGATION SYSTEM
AV-143
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AV
Revision: August 20072004 QX56
Screen is Not ShownEKS007MT
1. POWER SUPPLY AND GROUND CIRCUIT CHECK
Check power supply and ground circuit. Refer to AV- 11 8 , "
Power Supply and Ground Circuit Check for Display
Unit" .
OK or NG
OK >> Replace display unit. Refer to AV-158, "Removal and Installation of Display Unit" .
NG >> Check the malfunctioning parts.
A/C Screen is Not Shown (NAVI Screen is Shown)EKS007MV
1. CHECK IGNITION SIGNAL
Check ignition signal. Refer to AV- 1 2 4 , "
Ignition Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK CAN COMMUNICATION LINE
Check CAN communication line. Refer to AV- 1 3 1 , "
CAN Communication Line Check" .
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal and Installation of Display Control Unit" .
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
FUEL ECONOMY Screen is Not ShownEKS007MW
1. CHECK IGNITION SIGNAL
Check ignition signal. Refer to AV- 1 2 4 , "
Ignition Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK CAN COMMUNICATION LINE
Check CAN communication line. Refer to AV- 1 3 1 , "
CAN Communication Line Check" .
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal and Installation of Display Control Unit" .
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
Average Fuel Economy Displayed is Not Shown (“ *** ” is Shown)EKS007MX
1. CHECK VEHICLE SPEED SIGNAL
Check vehicle speed signal. Refer to AV-122, "
Vehicle Speed Signal Check for Display Control Unit" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. CHECK CAN COMMUNICATION LINE
Check CAN communication line. Refer to AV- 1 3 1 , "
CAN Communication Line Check" .
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal and Installation of Display Control Unit" .
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .

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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Revision: August 20072004 QX56
3. CHECK CAN COMMUNICATION LINE
Check CAN communication line. Refer to AV- 1 3 1 , "
CAN Communication Line Check" .
OK or NG
OK >> Replace display control unit. Refer to AV-158, "Removal and Installation of Display Control Unit" .
NG >> After filling out CAN DIAG SUPPORT MONITOR check sheet, GO TO LAN-5, "
CAN COMMUNI-
CATION" .
Unable to Operate All of AV Switches (Unable to Start Self-Diagnosis)EKS007N1
1. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check power supply and ground circuit. Refer to AV-120, "
Power Supply and Ground Circuit Check for AV
Switch" .
OK or NG
OK >> GO TO 2.
NG >> Check the malfunctioning parts.
2. AV SWITCH SELF-DIAGNOSIS
AV switch self-diagnosis. Refer to AV- 11 5 , "
AV Switch Self-Diagnosis Function" .
OK or NG
OK >> GO TO 3.
NG >> Check the malfunctioning parts.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check power supply and ground circuit. Refer to AV- 11 7 , "
Power Supply and Ground Circuit Check for Display
Control Unit" .
OK or NG
OK >> GO TO 4.
NG >> Check the malfunctioning parts.
4. CHECK COMMUNICATION LINE
Check communication line. Refer to AV- 1 3 0 , "
AV Communication Line Check (Between Display Control Unit
and AV Switch)" .
OK or NG
OK >> Replace AV switch. Refer to AV-158, "Removal and Installation of AV Switch" .
NG >> Replace display control unit. Refer to AV-158, "
Removal and Installation of Display Control Unit" .
Audio Does Not WorkEKS007N2
Refer to AV-28, "Trouble Diagnosis" .
Navigation System Does Not ActivateEKS007N4
1. POWER SUPPLY AND GROUND CIRCUIT CHECK
Check power supply and ground circuit. Refer to AV-116, "
Power Supply and Ground Circuit Check for NAVI
Control Unit" .
OK or NG
OK >> Replace NAVI control unit. Refer to AV-157, "Removal and Installation of NAVI Control Unit" .
NG >> Check the malfunctioning parts.

BCS-1
BODY CONTROL SYSTEM
K ELECTRICAL
CONTENTS
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SECTION BCS
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BCS
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
BCM (BODY CONTROL MODULE) ........................... 3
System Description .................................................. 3
BCM FUNCTION ................................................... 3
COMBINATION SWITCH READING FUNCTION ..... 3
CAN COMMUNICATION CONTROL .................... 6
BCM STATUS CONTROL ..................................... 6
SYSTEMS CONTROLLED BY BCM DIRECTLY ..... 7
SYSTEMS CONTROLLED BY BCM AND IPDM
E/R ........................................................................ 7
MAJOR COMPONENTS AND CONTROL SYS-
TEM ....................................................................... 7CAN Communication System Description ................ 8
Schematic ................................................................. 9
CONSULT-II Function (BCM) ................................. 11
CONSULT-II OPERATION ................................... 11
ITEMS OF EACH PART ...................................... 12
WORK SUPPORT ............................................... 12
CAN Communication Inspection Using CONSULT-
II (Self-Diagnosis) ................................................... 13
Configuration .......................................................... 13
DESCRIPTION .................................................... 13
READ CONFIGURATION PROCEDURE ............ 13
WRITE CONFIGURATION PROCEDURE .......... 16
Removal and Installation of BCM ........................... 19
REMOVAL ........................................................... 19
INSTALLATION ................................................... 19

BCM (BODY CONTROL MODULE)
BCS-3
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Revision: August 20072004 QX56
BCM (BODY CONTROL MODULE)PFP:284B2
System DescriptionEKS007GE

BCM (body control module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION
BCM has a combination switch reading function for reading the operation of combination switches (light, wiper
washer, turn signal) in addition to the function for controlling the operation of various electrical components.
Also, it functions as an interface that receives signals from the front air control, and sends signals to ECM
using CAN communication.
COMBINATION SWITCH READING FUNCTION
1. Description

BCM reads combination switch (light, wiper) status, and controls various electrical components accord-
ing to the results.

BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5)
and five input terminals (INPUT 1-5).
2. Operation description

BCM activates transistors of output terminals (OUTPUT 1-5) periodically and allows current to flow in
turn.

If any (1 or more) of the switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input ter-
minals (INPUT 1-5) becomes active.

At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When
voltage of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects
voltage change and BCM determines that switch is ON.
3. BCM - Operation table of combination switch

BCM reads operation status of combination switch by the combination shown in the following table.
LIIA0757E

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

BCM (BODY CONTROL MODULE)
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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