2010 INFINITI QX56 ecm

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTIONSEC-13
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Component DescriptionINFOID:0000000005147070
10. Center console area antenna (rear) M209 11. Overhead console area antenna R210
(view with overhead console removed) 12. Luggage area antenna B76
(view with rear carpet removed)
13. Intelligent Key warning buzzer E25 14. Combination meter M23, M24 15. Vehicle security indicator lamp
Item Function
Intelligent Key unit Receives lock/unlock signal from re mote keyless entry receiver, and then transmits to BCM.
BCM Verifies the received signal from Intelligent Key, then informs ECM whether to allow engine start.
Remote keyless entry receiver Receives lock/unlock signal from the Intelligent Key, and then transmits to Intelligent Key unit.
Intelligent Key Transmits button operation to remote keyless entry receiver.
Steering lock solenoid Locks the steering wheel when the ignition key is off and the Intelligent Key is outside the vehicle.
Inside key antenna Detects if Intelligent Key is inside the vehicle.
Intelligent Key warning buzzer Warns the user of the lock/unlock condition and inappropriate operations with the buzzer sound.
A/T shift selector (park position
switch) Detects whether the shift lever is in park.
Revision: April 20092010 QX56

SEC-14
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS
INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS
System DiagramINFOID:0000000005147071
System DescriptionINFOID:0000000005147072
INPUT/OUTPUT SIGNAL CHART
Intelligent Key Unit
BCM
SYSTEM DESCRIPTION
NATS (Nissan Anti-Theft System) has
the following immobilizer functions:
• Engine immobilizer shows high anti-theft performance to prevent engine from starting by other than the
owner.
• Only a key with key ID registered in BCM and ECM can start engine, and shows high anti-theft performance to prevent key from being copied or stolen.
• Security indicator always flashes with mechanical key removed condition (key switch: OFF) and ignition
knob released condition on LOCK position (ignition knob switch: OFF).
• Therefore, NATS warns outsiders that the vehicl e is equipped with the anti-theft system. Refer to SEC-18,
"System Description".
• If system detects malfunction, security indicator illum inates when ignition switch is turned to ON position.
• If the owner requires, ignition key ID or mechanical key ID can be registered for up to 4 keys.
• During trouble diagnosis or when the following parts have been replaced, and if mechanical key is added, registration* is required.
*1: All keys kept by the owner of the v ehicle should be registered with mechanical key.
-ECM
-BCM
LIIA2537E
Switch/Input signal Input signal to BCM BCM function Actuator/Output signal
Ignition knob switch Ignition knob
(push/release)
NATS• Steering lock solenoid
Key switch
Mechanical key
(Insert/remove)
Steering lock solenoid Steering
(lock/unlock)
ECM Engine status signal
Switch/Input signalInput signal to BCM BCM function Actuator/Output signal
NATS antenna amp. Key ID
NATS• Security indicator lamp
• Starter request
ECM Engine status signal
Revision: April 20092010 QX56

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATSSEC-15
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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- Mechanical key
- Intelligent Key unit
- Remote keyless entry receiver
- Steering lock solenoid
• NATS trouble diagnosis, system initialization and additional registration of other mechanical key IDs must be
carried out using CONSULT-III.
When NATS initialization has been completed, the ID of the inserted mechanical key or mechanical key IDs
can be carried out.
• Possible symptom of NATS malfunction is “Engine cannot start”. Identify the possible causes according to
“Work Flow”, Refer to SEC-4, "
Work Flow".
• If ECM other than Genuine NISSAN is installed, the engine cannot be started. For ECM replacement proce- dure, refer to SEC-9, "
ECM RE-COMMUNICATING FUNCTION : Description".
PRECAUTIONS FOR KEY REGISTRATION
• The key registration is a procedure that erases the current NATS ID once, and then re-registers a new ID.
Therefore the registered Intelligent Key is necessary for this procedure. Before starting the registration oper-
ation collect all registered Inte lligent Keys from the customer.
• The NATS ID registration is the procedure that regi sters the ID stored into the transponder (integrated in
mechanical key) to BCM.
The Intelligent Key ID registration is the procedure that registers the ID to Intelligent Key unit.
• When performing the Intelligent Key system registration only, the engine cannot be started by inserting the
key into the key cylinder. When performing the NATS r egistration only, the engine cannot be started by using
the mechanical key.
SECURITY INDICATOR
• Always flashes with ignition knob released (igniti on knob switch: LOCK) condition on ignition knob LOCK
position.
• Always flashes with ignition knob released (ignition knob switch: LOCK) c\
ondition on mechanical key removed position.
MAINTENANCE INFORMATION
CAUTION:
It is necessary to perform NATS ID registrati on when replacing any of the following part.
If it's not (or fail to do so), the electrical system may not operate properly.
• Intelligent Key unit
• BCM
•ECM
• Mechanical key
• Steering lock solenoid
• NATS antenna amp.
Revision: April 20092010 QX56

SEC-16
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS
Component Parts Location
INFOID:0000000005147073
Component DescriptionINFOID:0000000005147074
1. Key switch and ignition knob switch M12 2. Steering lock solenoid M15
(view with steering column removed) 3. Remote keyless entry receiver M25
(view with instru ment panel RH re-
moved)
4. BCM M18, M20 (view with instrument panel LH re-
moved) 5. Intelligent Key unit M70
(view with instrument panel LH re-
moved) 6. ECM E16
7. IPDM E/R E119, E120, E122, E124 (view with cover removed) 8. NATS antenna amp. M21
9. Combination meter M24
10. Security indicator lamp
ALKIA0959ZZ
Item Function
Intelligent Key unit Receives lock/unlock signal from remote keyless entry receiver, and then transmits to BCM.
BCM Controls the door lock function and room lamp function.
Remote keyless entry receiver Receives lock/unlock signal from th e Intelligent Key, and then transmits to Intelligent Key unit.
Intelligent Key Transmits button operation to remote keyless entry receiver.
Steering lock solenoid Locks the steering wheel when the ignition key is off and the Intelligent Key is outside the vehicle.
Revision: April 20092010 QX56

SEC-26
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005147083
CAN (Controller Area Network) is a serial communication
line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H line, CAN-L line) al lowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart, refer to LAN-44, "
CAN Communication Signal Chart".
DTC LogicINFOID:0000000005147084
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000005147085
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result”.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-5, "CAN Communication Control Circuit".
NO >> Refer to GI-38, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condition
Possible cause
U1000 CAN COMM CIRCUIT When Intelligent Key unit cannot communi-
cate CAN communication signal continuous-
ly for 2 seconds or more. In CAN communication system, any item (or items)
of the following listed below is malfunctioning.
•Transmission
• Receiving (BCM)
• Receiving (ECM)
• Receiving (METER/M&A)
Revision: April 20092010 QX56

B2192 ID DISCORD, IMMU-ECMSEC-35
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2192 ID DISCORD, IMMU-ECM
DescriptionINFOID:0000000005147099
BCM performs the ID verification with ECM that allows the engine to start. BCM starts the communication with
ECM if ignition switch is turned ON and starts the engi ne if the ID is OK. ECM prevents the engine from start-
ing if the ID is not registered.
DTC LogicINFOID:0000000005147100
DTC DETECTION LOGIC
NOTE:
• If DTC B2192 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
SEC-26, "
DTC Logic".
• If DTC B2192 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
SEC-27, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-35, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005147101
1.PERFORM INITIALIZATION
Perform initialization with CONSULT-III. Re-register all mechanical keys.
For initialization and registration of mechanical key. Refer to “CONSULT-III Operation Manual”.
Can the system be initialized and can the engine be started with re-registered mechanical key?
YES >> ID was unregistered.
NO >> GO TO 2
2.PEPLACE BCM
1. Replace BCM. Refer to BCS-59, "
Removal and Installation".
2. Perform initialization with CONSULT- III. Re-register all mechanical keys.
For initialization and registration of mechanical key. Refer to “CONSULT-III Operation Manual”.
Can the system be initialized and can the engine be started with re-registered mechanical key?
YES >> BCM is malfunctioning.
NO >> GO TO 3
3.PEPLACE ECM
1. Replace ECM. Refer to Removal and Installation.
2. Perform initialization with CONSULT- III. Re-register all mechanical keys.
For initialization and registration of mechanical key. Refer to “CONSULT-III Operation Manual”.
Can the system be initialized and can the engine be started with re-registered mechanical key?
YES >> ECM is malfunctioning.
NO >> GO TO 4
4.CHECK INTERMITTENT INCIDENT
Refer to GI-38, "
Intermittent Incident".
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2192 ID DISCORD IMMU-
ECM The ID verification results between BCM and ECM
are NG. The registration is necessary. •BCM
•ECM
Revision: April 20092010 QX56

SEC-36
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2192 ID DISCORD, IMMU-ECM
>> Inspection End.
Revision: April 20092010 QX56

B2193 CHAIN OF ECM-IMMUSEC-37
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2193 CHAIN OF ECM-IMMU
DescriptionINFOID:0000000005147102
BCM performs the ID verification with ECM that allows the engine to start. BCM starts the communication with
ECM if ignition switch is turned ON and starts the engi ne if the ID is OK. ECM prevents the engine from start-
ing if the ID is not registered.
DTC LogicINFOID:0000000005147103
DTC DETECTION LOGIC
NOTE:
• If DTC B2193 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
SEC-26, "
DTC Logic".
• If DTC B2193 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
SEC-27, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-37, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005147104
1.REPLACE BCM
1. Replace BCM. Refer to BCS-59, "
Removal and Installation".
2. Perform initialization with CONSULT-III. For initialization, refer to “CONSULT-III Operation Manual”.
Does the engine start?
YES >> BCM was malfunctioning.
NO >> ECM is malfunctioning. • Replace ECM.
• Perform ECM re-communicating function.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2193 CHAIN OF ECM-
IMMU Inactive communication between ECM and BCM • Harness or connectors
(The CAN communication line is
open or short)
•BCM
•ECM
Revision: April 20092010 QX56