2008 INFINITI QX56 diagram

ILLUMINATIONINL-41
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ILLUMINATION
Wiring DiagramINFOID:0000000001601403
AALWA0094GB
Revision: March 2010 2008 QX56

BCM (BODY CONTROL MODULE)INL-55
< ECU DIAGNOSIS >
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ECU DIAGNOSIS
BCM (BODY CONTROL MODULE)
DescriptionINFOID:0000000001601404
REFERENCE VALUES FOR BCM
For BCM reference values, refer to BCS-38, "Reference Value".
TERMINAL LAYOUT FOR BCM
For the terminal layout for the BCM, refer to BCS-40, "Terminal Layout".
PHYSICAL VALUES FOR BCM
For physical values for the BCM, refer to BCS-40, "Physical Values".
WIRING DIAGRAM - BCM
For the BCM wiring diagram, refer to BCS-46, "Wiring Diagram".
DTC INSPECTION PRIORITY CHART - BCM
For the BCM DTC inspection priority chart, refer to BCS-50, "DTCInspectionPriorityChart".
DTC INDEX - BCM
For the BCM DTC index, refer to BCS-50, "DTCIndex".
Revision: March 2010 2008 QX56

LAN
LAN-1
ELECTRICAL & POWER CONTROL
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SECTION LAN
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CONTENTS
LAN SYSTEM
CAN FUNDAMENTAL
PRECAUTION ....... ........................................
3
PRECAUTIONS .............................................. .....3
Precaution for Trouble Diagnosis ........................ ......3
Precaution for Harness Repair ..................................3
FUNCTION DIAGNOSIS .. .............................4
CAN COMMUNICATION SYSTEM ................ .....4
System Description ............................................. ......4
System Diagram ........................................................4
CAN Communication Control Circuit .........................5
DIAG ON CAN .....................................................6
Description .......................................................... ......6
System Diagram ........................................................6
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
BASIC INSPECTION ...................................13
DIAGNOSIS AND REPAIR WORKFLOW ..... ....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
HOW TO USE THIS MANU AL .....................
36
HOW TO USE THIS SECTION ....................... ....36
Caution ................................................................ ....36
Abbreviation List ......................................................36
PRECAUTION ..............................................37
PRECAUTIONS .................................................37
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
37
Precautions for Trouble Diagnosis ..........................37
Precautions for Harness Repair ..............................37
BASIC INSPECTION ...................................39
DIAGNOSIS AND REPAIR WORKFLOW ........39
Interview Sheet .................................................... ....39
Diagnosis Sheet (CAN Type 1) ...............................40
Diagnosis Sheet (CAN Type 2) ...............................41
Diagnosis Sheet (CAN Type 3) ...............................42
Diagnosis Sheet (CAN Type 4) ...............................43
FUNCTION DIAGNOSIS ..............................44
CAN COMMUNICATION SYSTEM ...................44
CAN System Specification Chart ......................... ....44
CAN Communication Signal Chart ..........................44
TROUBLE DIAGNOSIS ....................................47
CAN Diagnostic Support Monitor .............................47
DTC Index ...............................................................51
COMPONENT DIAGNOSIS .........................52
CAN COMMUNICATION SYSTEM ...................52
Component Parts Location .................................. ....52
Wiring Diagram - CAN SYSTEM - ...........................53
MALFUNCTION AREA CHART ........................60
Main Line ............................................................. ....60
Branch Line .............................................................60
Short Circuit .............................................................60
MAIN LINE BETWEEN TCM AND ADP CIR-
CUIT ..................................................................
61
Diagnosis Procedure ...............................................61
Revision: March 2010 2008 QX56

LAN-4
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
CAN COMMUNICATION SYSTEM
FUNCTION DIAGNOSIS
CAN COMMUNICATION SYSTEM
System DescriptionINFOID:0000000001374961
• CAN communication is a multiplex communication system. This enables the system to transmit and receive
large quantities of data at high speed by connecting c ontrol units with two communication lines (CAN-H and
CAN-L).
• Control units on the CAN network transmit signals us ing the CAN communication control circuit. They
receive only necessary signals from other c ontrol units to operate various functions.
• CAN communication lines adopt twisted-pair line st yle (two lines twisted) for noise immunity.
System DiagramINFOID:0000000001374962
Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.
SKIB8887E
Component Description
Main line CAN communication line between splices
Branch line CAN communication line between splice and a control unit
Splice A point connecting a branch line with a main line
Termination circuit Refer to LAN-5, "
CAN Communication Control Circuit".
Revision: March 2010 2008 QX56

LAN-6
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
DIAG ON CAN
DIAG ON CAN
DescriptionINFOID:0000000001374964
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.
System DiagramINFOID:0000000001374965
SKIB8714E
Name
Harness Description
DDL1 Tx
Rx
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
DDL2 K-LINE It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Diag on CAN CAN-H
CAN-L It is used for trouble diagnosis and control.
Revision: March 2010
2008 QX56

LAN
DIAGNOSIS AND REPAIR WORKFLOWLAN-13
< BASIC INSPECTION > [CAN FUNDAMENTAL]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Information Needed for Trouble DiagnosisINFOID:0000000001374970
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal ChartINFOID:0000000001374971
The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the sy
mptom, and by checking transmission and reception unit.
To o l U s a g e
Interview sheet For filling in vehicle information and interview with customer.
Data sheet For copying on-board diagnosis data.
Diagnosis sheet For detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system type)
ECU list
(On the “CAN DIAG SUPPORT
MNTR”) For checking the condition of control units and the status of CAN communication.
SELF-DIAG RESULTS
(CONSULT-III)
CAN DIAG SUPPORT MNTR
(CONSULT-III)
CAN communication signal
chart For converting information received from a customer into CAN communication signal transmission
and reception. This information can be used to judge whether a circuit between control units is nor-
mal or abnormal.
Abbreviation list For checking abbreviations in CAN communication signal chart and diagnosis sheet.
SKIB8715E
Revision: March 2010 2008 QX56

LAN
CAN COMMUNICATION SYSTEMLAN-53
< COMPONENT DIAGNOSIS > [CAN]
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Wiring Diagram - CAN SYSTEM -INFOID:0000000001282405
ALMWA0046GB
Revision: March 2010
2008 QX56

LAN-72
< COMPONENT DIAGNOSIS >[CAN]
LASER BRANCH LINE CIRCUIT
LASER BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282449
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the ICC s ensor for damage, bend and loose connection (unit side
and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ICC sensor.
2. Check the resistance between the ICC sensor harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the ICC sensor branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ICC sensor. Refer to CCS-47, "
Wiring Diagram".
Is the inspection result normal?
YES (Present error)>>Replace the ICC sensor. Refer to CCS-71, "ICC Sensor".
YES (Past error)>>Error was detect ed in the ICC sensor branch line.
NO >> Repair the power supply and the ground circuit.
ICC sensor harness connector Resistance (Ω)
Connector No. Terminal No.
E42 23Approx. 54 – 66
Revision: March 2010 2008 QX56