display INFINITI QX56 2007 Factory Service Manual

LAN-1
ELECTRICAL
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SECTION LAN
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CONTENTS
LAN SYSTEM
CAN FUNDAMENTAL
SERVICE INFORMATION ............................
3
PRECAUTIONS ...................................................3
Precaution When Using CONSULT-II .......................3
Precaution for Trouble Diagnosis ..............................3
Precaution for Harness Repair ..................................3
SYSTEM DESCRIPTION .....................................4
CAN Communication System ....................................4
Diag on CAN .............................................................5
TROUBLE DIAGNOSIS ......................................7
Condition of Error Detection ......................................7
Symptom When Error Occurs in CAN Communi-
cation System ............................................................
7
Self-Diagnosis .........................................................10
CAN Diagnostic Support Monitor ............................10
TROUBLE DIAGNOSES WORK FLOW ............13
Information Needed for Trouble Diagnosis .............13
How to Use CAN Communication Signal Chart ......13
Trouble Diagnosis Flow Chart .................................14
Trouble Diagnosis Procedure ..................................14
CAN
SERVICE INFORMATION ...........................
36
INDEX FOR DTC ................................................36
DTC No. Index ........................................................36
HOW TO USE THIS SECTION ...........................37
Caution ....................................................................37
Abbreviation List ......................................................37
PRECAUTIONS ..................................................38
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
38
Precaution When Using CONSULT-II .....................38
Precaution for Trouble Diagnosis ............................38
Precaution for Harness Repair ................................38
TROUBLE DIAGNOSIS ....................................40
CAN Diagnostic Support Monitor .............................40
CAN System Specification Chart .............................44
CAN Communication Signal Chart ..........................44
Schematic ................................................................49
Wiring Diagram - CAN - ...........................................50
Interview Sheet ........................................................53
Data Sheet ...............................................................54
CAN System (Type 1) ..............................................57
CAN System (Type 2) ..............................................58
CAN System (Type 3) ..............................................59
CAN System (Type 4) ..............................................60
Component Parts Location ......................................61
Harness Layout .......................................................61
Malfunction Area Chart ............................................61
Main Line Between TCM and Driver Seat Control
Unit ..........................................................................
62
Main Line Between TCM and ICC Sensor ...............63
Main Line Between ICC Sensor and ICC Unit .........64
Main Line Between ICC Unit and Driver Seat Con-
trol Unit ....................................................................
65
Main Line Between Driver Seat Control Unit and
Data Link Connector ................................................
65
Main Line Between Data Link Connector and ABS
Actuator and Electric Unit (Control Unit) ..................
66
ECM Branch Line Circuit .........................................67
TCM Branch Line Circuit .........................................67
ICC Sensor Branch Line Circuit ...............................68
ICC Unit Branch Line Circuit ....................................69
Driver Seat Control Unit Branch Line Circuit ...........69
BCM Branch Line Circuit .........................................70
Display Control Unit Branch Line Circuit .................70
Data Link Connector Branch Line Circuit ................71
Front Air Control Branch Line Circuit .......................71
Combination Meter Branch Line Circuit ...................72
Steering Angle Sensor Branch Line Circuit .............72
Transfer Control Unit Branch Line Circuit ................73
ABS Actuator and Electric Unit (Control Unit)
Branch Line Circuit ..................................................
74

LAN-8
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: Data link connector branch line open circuit
NOTE:
• When data link connector branch line is open, transmission and reception of CAN communication signals is
not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
• When data link connector branch line is open, the screen-display of the CONSULT-II “SELECT SYSTEM”
screen may be the same as when the CAN communication line has short-circuit. However, symptoms differ
depending on the case. See below chart for the differences.
Unit name Symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM Reverse warning chime does not sound.
EPS control unit Normal operation.
Combination meter• Shift position indicator and OD OFF indicator turn OFF.
• Warning lamps turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R Normal operation.
SKIB8739E
Unit name Symptom
ECM
Normal operation. BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
SELECT SYSTEM
(CONSULT-II)Difference of symptom
Data link connector branch line open circuit
All Diag on CAN units are not
indicated.Normal operation.
CAN-H, CAN-L harness short-circuitMost the units which are connected to the CAN com-
munication system enter fail-safe mode or are deac-
tivated.

LAN-12
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: Vehicle Display
ItemResult indi-
catedError counter Description
CAN_COMM
(Initial diagnosis)OK 0 Normal at present
NG 1 – 50Control unit error
(The number indicates how many times diagnosis has been
run.)
CAN_CIRC_1
(Transmission diagnosis)OK 0 Normal at present
UNKWN 1 – 50Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)
CAN_CIRC_2 – 9
(Reception diagnosis of each unit)OK 0 Normal at present
UNKWN 1 – 50Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional
parts)

TROUBLE DIAGNOSES WORK FLOW
LAN-19
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
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Some items may not be needed depending on CAN system type of vehicle.
Create On-board Diagnosis Copy Sheet
Display the trouble diagnosis result of CAN communication with the on-board diagnosis function on the vehicle
monitor, etc. Copy them on the on-board diagnosis copy sheet.
NOTE:
• For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-II
is not available.)
SKIB8721E

HOW TO USE THIS SECTION
LAN-37
< SERVICE INFORMATION >[CAN]
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HOW TO USE THIS SECTION
CautionINFOID:0000000003533620
• This section describes information peculiar to a vehicle, sheets for trouble diagnosis, and inspection proce-
dures.
• For trouble diagnosis procedure, refer to LAN-14, "
Trouble Diagnosis Procedure".
Abbreviation ListINFOID:0000000003533621
Abbreviations in CAN communication signal chart, and the diagnosis sheet are as per the following list.
Abbreviation Unit nameSELECT SYSTEM
(CONSULT-II)CAN DIAG SUPPORT MNTR
(CONSULT-II)
4WD Transfer control unit ALL MODE AWD/4WD AWD/4WD
A-BAG Air bag diagnosis sensor unit AIR BAG –
ABS ABS actuator and electric unit (control unit) ABS VDC/TCS/ABS
ADP Driver seat control unit AUTO DRIVE POS. –
BCM BCM BCM BCM/SEC
DISP Display control unit – DISPLAY
DLC Data link connector – –
ECM ECM ENGINE ECM
HVAC Front air control HVAC –
ICC ICC unit ICCICC
ICC/e4WD
IPDM-E IPDM E/R IPDM E/R IPDM E/R
LASER ICC sensor – ICC SENSOR
M&A Combination meter – METER/M&A
STRG Steering angle sensor – STRG
TCM A/T assembly A/T TCM

LAN-42
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
Transfer Control Unit
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
ABS Actuator and Electric Unit (Control Unit)
CAUTION:SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
HVACTRANSMIT DIAG Signal transmission status
OKOK
or
1 – 39
*UNKWN 0
ECM Signal receiving status from the ECM
TCM Not used even though indicated
BCM/SEC Signal receiving status from the BCM
OKOK
or
1 – 39
*UNKWN 0
VDC/TCS/ABSSignal receiving status from the ABS actu-
ator and electric unit (control unit)
IPDM E/R Not used even though indicated
DISPLAYSignal receiving status from the display
control unitOKOK
or
1 – 39
*UNKWN 0
I-KEY
Not used even though indicated EPS
AWD/4WD
e4WD
ICC
LANE KEEP
TIRE-P
SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
ALL MODE AWD/
4WDTRANSMIT DIAG Signal transmission status
OKOK
or
1 – 39
*UNKWN 0 ECM Signal receiving status from the ECM
VDC/TCS/ABSSignal receiving status from the ABS actu-
ator and electric unit (control unit)
TCM Signal receiving status from the TCM
STRGSignal receiving status from the steering
angle sensor
SELECT SYSTEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT
ABSINITIAL DIAG Status of CAN controller
OKNG
Caution
TRANSMIT DIAG Signal transmission status
UNKWN ECM Signal receiving status from the ECM
TCM Signal receiving status from the TCM
METER/M&A Not used even though indicated
STRG Signal receiving status from the steering angle sensor
OK UNKWN ICC Signal receiving status from the ICC unit
AWD/4WD Signal receiving status from the transfer control unit

TROUBLE DIAGNOSIS
LAN-43
< SERVICE INFORMATION >[CAN]
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Never replace the unit even when “NG” is indicated on the “INITIAL DIAG” at this stage. Follow the trouble diagnosis proce-
dures.
IPDM E/R
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
MONITOR ITEM LIST (ON-BOARD DIAGNOSIS)
Display Control Unit
NOTE:
CAN diagnostic support monitor of the display control unit is indicated on the vehicle display. Refer to AV-123,
"CAN Communication Line Check".
*: The error counter stops counting when it reaches “50” and holds “50” until it is deleted.SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
IPDM E/RTRANSMIT DIAG Signal transmission status
OKOK
or
1 – 39
*UNKWN 0 ECM Signal receiving status from the ECM
BCM/SEC Signal receiving status from the BCM
PKIB6080E
Unit name Diagnosis item DescriptionIndicated items on CAN DIAG SUPPORT MONITOR
Normal Error
Result indi-
catedError
counter
(Reference)Result indi-
catedError
counter
(Reference)
Display control
unitCAN_COMM Status of CAN controller
OK0
or
1 – 50*NG
1 – 50* CAN_CIRC_1 Signal transmission status
UNKWN CAN_CIRC_2Signal receiving status from the
BCM
CAN_CIRC_3Signal receiving status from the
ECM
CAN_CIRC_4Signal receiving status from the
front air control
CAN_CIRC_5Signal receiving status from the
combination meter
CAN_CIRC_6 Not used even though indicated
CAN_CIRC_7Signal receiving status from the
IPDM E/ROK0
or
1 – 50*UNKWN 1 – 50*
CAN_CIRC_8
Not used even though indicated
CAN_CIRC_9

TROUBLE DIAGNOSIS
LAN-45
< SERVICE INFORMATION >[CAN]
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Engine speed signal T R R R R R R
Engine status signal T R
Fuel consumption monitor signalTR
RT
ICC steering switch signal T R
Malfunction indicator lamp signal T R
Wide open throttle position signal T R
A/T CHECK indicator lamp signal T R
A/T fluid temperature sensor signal T R
A/T position indicator lamp signal T R R
A/T self-diagnosis signal R T
Current gear position signal T R R
Output shaft revolution signal R T R
P range signal T R R R R
Turbine revolution signal R T R
ICC sensor signal T R
Buzzer output signalTR
TR
ICC OD cancel request signal R R T
ICC operation signal R R T
ICC system display signal T R
System setting signalTR
RT
A/C switch signal R T R
Blower fan motor switch signal R T
Day time running light request signal T R R
Door switch signal R T R R R
Front fog light request signal T R
Front wiper request signal R T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch signal R T R
Key fob door unlock signal R T
Key fob ID signal R T
Key switch signal R T
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R R
Sleep wake up signal R T R R
Theft warning horn request signal T R
Tire pressure data signal T R
Tire pressure signal T R R
Turn indicator signal T RSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
ABS
IPDM-E

TROUBLE DIAGNOSIS
LAN-47
< SERVICE INFORMATION >[CAN]
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Cooling fan speed request signal TR
Engine coolant temperature signal T R R
Engine speed signal T R R R R R R R
Engine status signal T R
Fuel consumption monitor signalTR
RT
ICC steering switch signal T R
Malfunction indicator lamp signal T R
Wide open throttle position signal T R
A/T CHECK indicator lamp signal T R
A/T fluid temperature sensor signal T R
A/T position indicator lamp signal T R R R
A/T self-diagnosis signal R T
Current gear position signal T R R
Output shaft revolution signal R T R R
P range signal T R R R R
Turbine revolution signal R T R
ICC sensor signal T R
Buzzer output signalTR
TR
ICC OD cancel request signal R R T
ICC operation signal R R T
ICC system display signal T R
System setting signalTR
RT
A/C switch signal R T R
Blower fan motor switch signal R T
Day time running light request signal T R R
Door switch signal R T R R R
Front fog light request signal T R
Front wiper request signal R T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch signal R T R
Key fob door unlock signal R T
Key fob ID signal R T
Key switch signal R T
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R R
Sleep wake up signal R T R R
Theft warning horn request signal T R
Tire pressure data signal T RSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
4WD
ABS
IPDM-E

LAN-56
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
ON-BOARD DIAGNOSIS COPY SHEET
NOTE:
CAN diagnostic support monitor of the display control unit is indicated on the vehicle display. Refer to AV-109,
"CAN Diagnostic Support Monitor".
PKID0390E
SKIB8771E