2011 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2011 Factory Service Manual
LAN
LAN-5
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Diagnosis Procedure ...........................................
..
178
4WD BRANCH LINE CIRCUIT .........................179
Diagnosis Procedure ..............

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Diagnosis Procedure ...........................................
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178
4WD BRANCH LINE CIRCUIT .........................179
Diagnosis Procedure ........................................... ..179
ABS BRANCH LINE CIRCUIT .........................180
Diagnosis Procedure ........................................... ..180
TCM BRANCH LINE CIRCUIT .........................181
Diagnosis Procedure ........................................... ..181
A-BAG BRANCH LINE CIRCUIT .....................182
Diagnosis Procedure ........................................... ..182
AV BRANCH LINE CIRCUIT ............................183
Diagnosis Procedure ........................................... ..183
BCM BRANCH LINE CIRCUIT ........................184
Diagnosis Procedure ........................................... ..184
DLC BRANCH LINE CIRCUIT .........................185
Diagnosis Procedure ........................................... ..185
HVAC BRANCH LINE CIRCUIT ......................186
Diagnosis Procedure ........................................... ..186
M&A BRANCH LINE CIRCUIT ........................187
Diagnosis Procedure ........................................... ..187
STRG BRANCH LINE CIRCUIT .......................188
Diagnosis Procedure ........................................... ..188
TPMS BRANCH LINE CIRCUIT .......................189
Diagnosis Procedure ........................................... ..189
IPDM-E BRANCH LINE CIRCUIT ....................190
Diagnosis Procedure ........................................... ..190
ADP BRANCH LINE CIRCUIT .........................191
Diagnosis Procedure ........................................... ..191
E-SUS BRANCH LINE CIRCUIT ......................192
Diagnosis Procedure ........................................... ..192
PWBD BRANCH LINE CIRCUIT ......................193
Diagnosis Procedure ........................................... ..193
CAN COMMUNICATION CIRCUIT ..................194
Diagnosis Procedure ........................................... ..194
CAN SYSTEM (TYPE 4)
DTC/CIRCUIT DIAGNOSIS .......................
196
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ................................................................ ..
196
Diagnosis Procedure ........................................... ..196
MAIN LINE BETWEEN ADP AND PWBD CIR-
CUIT ..................................................................
197
Diagnosis Procedure ........................................... ..197
MAIN LINE BETWEEN RDR-R AND RDR-L
CIRCUIT ......................................................... ..
198
Diagnosis Procedure ........................................... ..198
MAIN LINE BETWEEN RDR-L AND LANE
CIRCUIT ..........................................................
199
Diagnosis Procedure ........................................... ..199
MAIN LINE BETWEEN LANE AND APA CIR-
CUIT ................................................................
201
Diagnosis Procedure .............................................201
ECM BRANCH LINE CIRCUIT .......................202
Diagnosis Procedure .............................................202
4WD BRANCH LINE CIRCUIT .......................203
Diagnosis Procedure ........................................... ..203
ABS BRANCH LINE CIRCUIT ........................204
Diagnosis Procedure .............................................204
TCM BRANCH LINE CIRCUIT ........................205
Diagnosis Procedure .............................................205
A-BAG BRANCH LINE CIRCUIT ....................206
Diagnosis Procedure .............................................206
AFS BRANCH LINE CIRCUIT ........................207
Diagnosis Procedure .............................................207
AV BRANCH LINE CIRCUIT ..........................208
Diagnosis Procedure .............................................208
BCM BRANCH LINE CIRCUIT .......................209
Diagnosis Procedure .............................................209
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 1) ..............................
210
Diagnosis Procedure .............................................210
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 2) ..............................
211
Diagnosis Procedure .............................................211
DLC BRANCH LINE CIRCUIT ........................212
Diagnosis Procedure .............................................212
HVAC BRANCH LINE CIRCUIT .....................213
Diagnosis Procedure .............................................213
M&A BRANCH LINE CIRCUIT .......................214
Diagnosis Procedure .............................................214
STRG BRANCH LINE CIRCUIT .....................215
Diagnosis Procedure .............................................215
TPMS BRANCH LINE CIRCUIT .....................216
Diagnosis Procedure .............................................216
IPDM-E BRANCH LINE CIRCUIT ...................217
Diagnosis Procedure .............................................217
ADP BRANCH LINE CIRCUIT ........................218
Diagnosis Procedure .............................................218
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
LAN-6
PSB BRANCH LINE CIRCUIT .........................219
Diagnosis Procedure ........................................... ..219
E-SUS BRANCH LINE CIRCUIT .....................220
Diagnosis Procedu

Page 3427 of 5598

INFINITI QX56 2011 Factory Service Manual
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PRECAUTIONSLAN-7
< PRECAUTION > [CAN FUNDAMENTAL]
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PRECAUTION
PRECAUTIONS
Precautions for Trouble DiagnosisINFOID:0000000006220510
CAUTION:
• Never apply 7.0 V or m

Page 3428 of 5598

INFINITI QX56 2011 Factory Service Manual
LAN-8
< SYSTEM DESCRIPTION >[CAN FUNDAMENTAL]
SYSTEM
SYSTEM DESCRIPTION
SYSTEM
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM
: System DescriptionINFOID:0000000006220512
CAN communication is a

Page 3429 of 5598

INFINITI QX56 2011 Factory Service Manual
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SYSTEMLAN-9
< SYSTEM DESCRIPTION > [CAN FUNDAMENTAL]
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CAN COMMUNICATION SYSTEM : CA
N Communication Control CircuitINFOID:0000000006220514
*: These are the only contr

Page 3430 of 5598

INFINITI QX56 2011 Factory Service Manual
LAN-10
< SYSTEM DESCRIPTION >[CAN FUNDAMENTAL]
SYSTEM
DIAG ON CAN : System Diagram
INFOID:0000000006220516
SKIB8714E
Name Harness Description
DDL1 Tx
Rx
It is used for trouble diagnosis. (CAN-H and C

Page 3431 of 5598

INFINITI QX56 2011 Factory Service Manual
LAN
TROUBLE DIAGNOSISLAN-11
< SYSTEM DESCRIPTION > [CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000006220517
DTC of CAN communication is in

LAN
TROUBLE DIAGNOSISLAN-11
< SYSTEM DESCRIPTION > [CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000006220517
DTC of CAN communication is indicated on SELF-DIA
G RESULTS on CONSULT-III if a CAN communication
signal is not transmitted or received between units for 2 seconds or more.
NOTE:
DTCs of CAN communication are as follows:
U0101
U0140
U0164
U1000
U1001
U1507
U1508
CAN COMMUNICATION SYSTEM ERROR
CAN communication line open (CAN-H, CAN-L, or both)
CAN communication line short (ground, betw een CAN communication lines, other harnesses)
Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN DTC OF CAN COMMUNICATION IS I NDICATED EVEN THOUGH CAN COMMUNICATION
SYSTEM IS NORMAL
Removal/installation of parts: Error may be detec ted when removing and installing CAN communication unit
and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
Fuse blown out (removed): CAN communication of the unit may cease.
Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (Depending on the control unit which carries out CAN communication).
Error may be detected if the power supply circuit of the control unit, which carries out CAN communication,
malfunctions (Depending on the control unit which carries out CAN communication).
Error may be detected if reprogramming is not completed normally.
CAUTION:
CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG
RESULTS of CONSULT-III under th e above conditions. Erase the memo ry of the self-diagnosis of each
unit.
Symptom When Error Occurs in CAN Communication SystemINFOID:0000000006220518
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communicati on line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
Refer to LAN-23, "
Abbreviation List" for the unit abbreviation.
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
LAN-12
< SYSTEM DESCRIPTION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM branch line open circuit
Example: Data link connector branch line open circuit
SKIB8738E
Unit name Major symptom
ECM Engi

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