2008 INFINITI QX56 engine

PREPARATIONSE-45
< PREPARATION >
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PREPARATION
PREPARATION
Special Service ToolINFOID:0000000001606200
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000001606201
Tool number
(Kent-Moore No.)
Tool name Description
—
(J-39570)
Chassis ear Locating the noise
—
(J-43980)
NISSAN Squeak and Rattle
Kit Repairing the cause of noise
SIIA0993E
SIIA0994E
(Kent-Moore No.)
Tool name
Description
(J-39565)
Engine ear Locating the noise
SIIA0995E
Revision: March 2010
2008 QX56

SEC-1
BODY EXTERIOR, DOORS, ROOF & VEHICLE SECURITY
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SECTION SEC
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CONTENTS
SECURITY CONTROL SYSTEM
WITH INTELLIGENT KEY SYSTEM
BASIC INSPECTION ....... .............................
3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Work Flow ........................................................... ......3
PRE-INSPECTION FOR DIAGNOSTIC ..............6
Basic Inspection .................................................. ......6
Vehicle Security Operation Check ............................6
INSPECTION AND ADJUSTMENT .....................8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ......
8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement .......
8
ECM RE-COMMUNICATING FUNCTION ............. ......8
ECM RE-COMMUNICATING FUNCTION : De-
scription .....................................................................
8
ECM RE-COMMUNICATING FUNCTION : Spe-
cial Repair Requirement ............................................
8
FUNCTION DIAGNOSIS ...............................9
INTELLIGENT KEY SYSTEM/ENGINE
START FUNCTIO N ........................................ .....
9
System Diagram .................................................. ......9
System Description ...................................................9
Component Parts Location ......................................11
Component Description ...........................................12
NVIS (NISSAN VEHICLE IMMOBILIZER SYS-
TEM-NATS) ........................................................
13
System Diagram .................................................. ....13
System Description .................................................13
Component Parts Location ......................................15
Component Description ..........................................15
VEHICLE SECURITY SYSTEM .........................17
System Diagram .................................................. ....17
System Description .................................................17
Component Parts Location .................................. ....18
Component Description ...........................................19
DIAGNOSIS SYSTEM (BCM) ...........................20
COMMON ITEM ..................................................... ....20
COMMON ITEM : CONSULT-III Function (BCM -
COMMON ITEM) .....................................................
20
IMMU ...................................................................... ....20
IMMU : CONSULT-III Function (BCM - IMMU) ........20
THEFT ALM ........................................................... ....21
THEFT ALM : CONSULT-III Function (BCM -
THEFT ALM) ....................................................... ....
21
DIAGNOSIS SYSTEM (INTELLIGENT KEY
UNIT) .................................................................
22
CONSULT-III Function (INTELLIGENT KEY) ..........22
COMPONENT DIAGNOSIS .........................24
U1000 CAN COMM CIRCUIT ...........................24
Description ........................................................... ....24
DTC Logic ................................................................24
Diagnosis Procedure ...............................................24
U1010 CONTROL UNIT (CAN) .........................25
Description ...............................................................25
DTC Logic ................................................................25
Diagnosis Procedure ...............................................25
Special Repair Requirement ....................................25
B2013 ID DISCORD I-KEY-STRG ....................26
Description ...............................................................26
DTC Logic ................................................................26
Diagnosis Procedure ...............................................26
B2190, P1614 NATS ANTENNA AMP. ............29
Description ...............................................................29
DTC Logic ................................................................29
Diagnosis Procedure ...............................................29
Revision: March 2010 2008 QX56

SEC-2
B2191, P1615 DIFFERENCE OF KEY ..............32
Description ..............................................................32
DTC Logic ...............................................................32
Diagnosis Procedure ..............................................32
B2192, P1611 ID DISCORD, IMMU-ECM .........33
Description ........................................................... ...33
DTC Logic ...............................................................33
Diagnosis Procedure ..............................................33
B2193, P1612 CHAIN OF ECM-IMMU ..............35
Description ........................................................... ...35
DTC Logic ...............................................................35
Diagnosis Procedure ..............................................35
B2194 ID DISCORD IMMU-I-KEY .....................36
Description ........................................................... ...36
DTC Logic ...............................................................36
Diagnosis Procedure ..............................................36
B2552 INTELLIGENT KEY ................................37
Description ........................................................... ...37
DTC Logic ...............................................................37
Diagnosis Procedure ..............................................37
Special Repair Requirement ...................................37
B2590 ID DISCORD BCM-I-KEY .................... ...38
Description ........................................................... ...38
DTC Logic ...............................................................38
Diagnosis Procedure ..............................................38
P1610 LOCK MODE ..........................................39
Description ........................................................... ...39
DTC Logic ...............................................................39
Diagnosis Procedure ..............................................39
POWER SUPPLY AND GROUND CIRCUIT .....40
INTELLIGENT KEY UNIT ...................................... ...40
INTELLIGENT KEY UNIT : Diagnosis Procedure ...40
BCM ........................................................................ ...40
BCM : Diagnosis Procedure ...................................40
KEY CYLINDER SWITCH .................................42
Description ........................................................... ...42
Component Function Check ...................................42
Diagnosis Procedure ..............................................42
IGNITION KNOB SWITCH .................................44
Ignition Knob Switch Check ................................. ...44
HOOD SWITCH .................................................46
Diagnosis Procedure ..............................................46
HORN FUNCTION .............................................48
Symptom Table ................................................... ...48
VEHICLE SECURITY INDICATOR ....................49
Description ........................................................... ...49
Component Function Check .................................49
Diagnosis Procedure ............................................ ...49
ECU DIAGNOSIS .......................................51
BCM (BODY CONTROL MODULE) ............... ...51
Reference Value .................................................. ...51
Terminal Layout ......................................................53
Physical Values .......................................................53
Wiring Diagram - VEHICLE SECURITY SYSTEM ...59
Wiring Diagram - IVIS .............................................70
Fail Safe .................................................................78
DTC Inspection Priority Chart ...............................79
DTC Index ..............................................................79
INTELLIGENT KEY UNIT ..................................81
Reference Value - Intelligent Key Unit ................. ...81
Reference Value - Steering Lock Solenoid .............84
Wiring Diagram - INTELLIGENT KEY SYSTEM/
ENGINE START FUNCTION - ................................
85
Fail Safe .................................................................96
DTC Inspection Priority Chart ...............................97
DTC Index ..............................................................97
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) .................
98
Reference Value .................................................. ...98
Terminal Layout ....................................................100
Physical Values .....................................................100
Wiring Diagram .....................................................105
Fail Safe ...............................................................108
DTC Index ............................................................110
SYMPTOM DIAGNOSIS ...........................111
INTELLIGENT KEY SYSTEM/ENGINE
START FUNCTION SYMPTOMS ................... ..
111
Symptom Table .................................................... .111
VEHICLE SECURITY SYSTEM SYMPTOMS ..112
Symptom Table .....................................................112
NISSAN VEHICLE IMMOBILIZER SYSTEM-
NATS SYMPTOMS ...........................................
113
Symptom Table .................................................... .113
PRECAUTION ...........................................114
PRECAUTIONS .............................................. ..114
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
114
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ................................
114
ON-VEHICLE REPAIR ..............................116
INTELLIGENT KEY UNIT ............................... ..116
Removal and Installation .......................................116
Revision: March 2010 2008 QX56

SEC-6
< BASIC INSPECTION >[WITH INTELLIGENT KEY SYSTEM]
PRE-INSPECTION FOR DIAGNOSTIC
PRE-INSPECTION
FOR DIAGNOSTIC
Basic InspectionINFOID:0000000004807932
The engine start function, door lock function, power distribution system and NATS-IVIS/ NVIS in the Intelligent
Key system are closely related to each other regarding control. Narrow down the functional area in question
by performing basic inspection to identify which function is malfunctioning. The vehicle security function can
operate only when the door lock and power distribution system are operating normally. Therefore, it is easy to
identify any factor unique to the vehicle security syst em by performing the vehicle security operation check
after basic inspection.
1.CHECK DOOR LOCK OPERATION
Check the door lock for normal operation with the In telligent Key controller and door request switch.
Successful door lock operation with the Intelligent Key and request SW indicates that the remote keyless entry
receiver and inside key antenna required for engine start are functioning normally.
Identify the malfunctioning point by referring to the DLK section if the door cannot be unlocked.
Can the door be locked with the Intelligent Key and door request switch?
YES >> GO TO 2.
NO >> Refer to DLK-200, "
Symptom Table".
2.CHECK ENGINE STARTING
Check that the engine starts when operating with the Intelligent Key.
Does the engine start?
YES >> GO TO 3.
NO >> Refer to S E C - 111 , "
Symptom Table".
3.CHECK STEERING LOCK
Does the steering lock when operating door switch after switching the power supply from ON position (or ACC
position) to LOCK position?
If door switch is malfunctioning, BC M cannot lock the steering. If BCM does not detect DTC, steering lock unit
is normal.
Does steering lock?
YES >> GO TO 4.
NO >> Refer to DLK-67, "
ComponentFunctionCheck".
4.CHECK IGNITION KNOB SWITCH OPERATION
Press ignition knob to check switch operation.
Does the combination meter display any message?
YES >> GO TO 5.
NO >> Refer to SEC-44, "
Ignition Knob Switch Check".
5.CHECK VEHICLE SECURITY SYSTEM
Check the vehicle security system for normal operation.
The vehicle security function can operate only when the door lock and power distribution functions are operat-
ing normally.
Therefore, it is easy to identify any factor unique to the vehicle security by performing the vehicle security
operation check after this basic inspection.
>> Go to SEC-6, "
Vehicle Security Operation Check".
Vehicle Security Operation CheckINFOID:0000000004807933
1.INSPECTION START
Turn ignition switch OFF”.
NOTE:
Before starting operation check, open front windows.
>> GO TO 2.
Revision: March 2010 2008 QX56

SEC-8
< BASIC INSPECTION >[WITH INTELLIGENT KEY SYSTEM]
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
ADDITIONAL SERVICE WHEN
REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement
INFOID:0000000001539097
Refer to the CONSULT-III Operation Manual.
ECM RE-COMMUNICATING FUNCTION
ECM RE-COMMUNICATING FUNCTION : DescriptionINFOID:0000000001539098
Performing following procedure can automatically per form re-communication of ECM and BCM, but only when
the ECM has been replaced with a new one (*1).
*1: New one means an ECM which has never been energized on-board.
(In this step, initialization procedur e by CONSULT-III is not necessary)
NOTE:
• When registering new Key IDs or replacing the ECM that is not brand new, refer to CONSULT-III Oper-
ation Manual.
• If multiple keys are attached to the key holder, separate them before work.
• Distinguish keys with unregistered key ID from those with registered ID.
ECM RE-COMMUNICATING FUNCTION : Special Repair RequirementINFOID:0000000001539099
1.PERFORM ECM RE-COMMUNICATING FUNCTION
1. Install ECM.
2. Using a registered key (*2), turn ignition switch to “ON”. *2: To perform this step, use the key that has been used before performing ECM replacement.
3. Maintain ignition switch in “ON” position for at least 5 seconds.
4. Turn ignition switch to “OFF”.
5. Start engine.
Can engine be started?
YES >> Procedure is completed.
NO >> Initialize control unit. Refer to CONSULT-III Operation Manual.
Revision: March 2010 2008 QX56

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTIONSEC-9
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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FUNCTION DIAGNOSIS
INTELLIGENT KEY SYSTEM /ENGINE START FUNCTION
System DiagramINFOID:0000000001539100
System DescriptionINFOID:0000000001539101
INPUT/OUTPUT SIGNAL CHART
Intelligent Key Unit
IPDM E/R
BCM
SYSTEM DESCRIPTION
• The engine start function of Intelligent Key system is a system that makes it possible to start and stop the
engine without using the key. It verifies the electr onic ID using two-way communications when pressing the
ignition knob switch while carrying the Intelligent Key, which operates based on the results of electronic ID
verification for Intelligent Key using two-way communications between the Intelligent Key and the vehicle.
NOTE:
The driver should carry the Intelligent Key at all times.
Switch/Input signal Input signal to
Intelligent Key unit Intelligent Key unit
function Actuator/Output signal
Key switch Mechanical key
(insert/remove)
Engine start function• KEY warning lamp/buzzer
• Steering lock solenoid
• Starter relay requ
est (to IPDM E/R)
• Inside key antenna
(Front and rear center console, over-
head console, luggage compartment)
• Key interlock solenoid
Ignition knob switch
Ignition knob
(push/release)
Steering lock solenoid Steering lock
(lock/unlock)
Inside key antenna
(Front and rear center console, over-
head console, luggage compartment) Intelligent key
(inside antenna detection
area or not.)
Switch/Input signal Input signal to
IPDM E/R IPDM E/R function
Actuator/Output signal
Transmission range switch P, N range Engine start function• Starter relay
• Starter motor
Switch/Input signal Input signal to
BCM BCM function
Actuator/Output signal
Key switch Brake
(press/release)
Engine start function• Inside key antenna
(Front and rear center console, over-
head console, luggage compartment)
ALKIA0925GB
Revision: March 2010 2008 QX56

SEC-10
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION
• Intelligent Key has 2 IDs (for Intelligent Key and for
NATS). It can perform the door lock/unlock operation and
the engine start operation when the registered Intelligent Key is carried.
• When the Intelligent Key battery is discharged, it can be used as emergency back-up by inserting the
mechanical key set in the Intelligent Key to the ignition key cylinder. At that time, perform the NATS ID verifi-
cation. If it is used when the Intelligent Key is carried, perform the Intelligent Key ID verification.
• If the ID is successfully verified, and when the igniti on knob switch is pressed, steering lock will be released
and initiating the engine will be possible.
• The door lock/unlock operation can be performed when the Intelligent Key battery is discharged, by operat-
ing the driver door key cylinder using the mechanical key set in the Intelligent Key.
• Up to 4 Intelligent Keys can be registered (including the standard Intelligent Key) on request from the owner. NOTE:
• Refer to DLK-17, "
INTELLIGENT KEY : System Description" for any functions other than engine start func-
tion of Intelligent Key system.
PRECAUTIONS FOR INTELLIGENT KEY SYSTEM
• For vehicles equipped with the Intelligent Key system , the transponder [the chip for NATS ID verifi-
cation] is integrated into the Inte lligent Key. Therefore, the Intellig ent Key alone is capable of provid-
ing security clearance for the engine to start. Also, when the mechanical key alone is inserted into
the key cylinder, performs the NATS ID verification to allow the engine to start. For vehicles without
Intelligent Key system, the transponder is integrated into the mechanical key which must be inserted
into the key cylinder to perform the NATS ID verification to allow the engine to start.
OPERATION WHEN INTELLIGENT KEY IS CARRIED
1. When the ignition knob switch is ON, the Intelligent Key unit transmits the request signal to the Intelligent
Key.
2. The Intelligent Key receives the request signal and transmits the Intelligent Key ID signal to the Intelligent Key unit.
3. The Intelligent Key unit receives the Intelligent Key ID signal and verifies it with the registered ID.
4. Intelligent Key unit transmits the steering lock/unlock signal to steering lock solenoid if the verification results are OK. For detail of key warning message operation, refer to DLK-34, "
System Description".
5. Release of the steering lock.
6. BCM transmits the starter request signal via CAN communication to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM judges that the engine start condition is satisfied.
7. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
8. When shift position is in P or N position, battery power is supplied through the starter relay and operate the starter motor and to start the cranking.
CAUTION:
If a malfunction is detected in the Intelligent Key system, the “KEY” warning message will be dis-
played in the combination meter. At th at time, the engine cannot be started.
OPERATION RANGE
Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine might not start
when Intelligent Key is on instrument panel or in glove box.
OPERATION WHEN MECHANICAL KEY IS USED
When the Intelligent Key battery is discharged, performs the NATS ID verification between the integrated tran-
sponder and BCM by inserting the mechanical key into the key cylinder, and then the engine can be started.
For details relating to starting the engine using mechanical key, refer to SEC-13, "
System Description".
STEERING LOCK OPERATION
Steering is locked by steering lock solenoid when ignition switch is in the LOCK position (the ignition knob is
released) and key switch is OFF (key is removed from ignition key cylinder).
Revision: March 2010 2008 QX56

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTIONSEC-11
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Component Parts LocationINFOID:0000000001539102
ALKIA0958ZZ
1. BCM M18, M19, M20 (view with instrument panel LH removed) 2. Intelligent Key unit M70
(view with instrument panel LH removed) 3. IPDM E/R
E119, E120, E122, E124
4. ECM E16 5. Key switch and ignition knob switch M12
(view with st eering column removed) 6. Steering lock solenoid M15
7. Remote keyless entry receiver M25 (view with instrume nt panel RH removed) 8. A/T shift selector (detention switch key)
M203
(view with center console removed) 9. Inside key antenna 3 (front of cen-
ter console) M210
(view with center console removed)
Revision: March 2010 2008 QX56