2008 INFINITI QX56 steering

SEC-14
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
NVIS (NISSAN VEHICLE I
MMOBILIZER SYSTEM-NATS)
- 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-3, "
Work Flow".
• If ECM other than Genuine NISSAN is installed, t he engine cannot be started. For ECM replacement proce-
dure, refer to SEC-8, "
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 fo r this procedure. Before starting the registration oper-
ation collect all registered Intelligent 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 procedur e 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 registration only, the engine cannot be started by using
the mechanical key.
SECURITY INDICATOR
• Always flashes with ignition knob released (ignition knob switch: LOCK) condition on ignition knob LOCKposition.
• Always flashes with ignition knob released (ignition knob switch: LOCK) condition on mechanical key removed position.
MAINTENANCE INFORMATION
CAUTION:
It is necessary to perform NATS ID registration 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: March 2010 2008 QX56

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
SEC-15
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Component Parts LocationINFOID:0000000001539106
Component DescriptionINFOID:0000000001539107
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 instrument panel RH re-
moved)
4. BCM M18, M19, 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 E122, E124 (view with co ver removed) 8. NATS antenna amp. M21
9. Combination meter M23, M24
10. Security indicator lamp
ALKIA0959ZZ
Item Function
Intelligent Key unit Receives lock/unlock signal from re mote 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 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.
Revision: March 2010 2008 QX56

SEC-26
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2013 ID DISCORD I-KEY-STRG
B2013 ID DISCORD I-KEY-STRG
DescriptionINFOID:0000000001539123
Intelligent Key unit performs the ID verification with the
steering lock solenoid and releases the steering lock if
both Intelligent Key unit and steering lock solenoid ID are same. Intelligent Key unit starts the communication
with the steering lock solenoid when Intelligent Key is carried into the vehicle and the ignition knob switch is
pressed.
DTC LogicINFOID:0000000001539124
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Press the ignition knob switch.
2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-26, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000001539125
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 steering lo ck be released with re-registered mechanical key?
YES >> Steering lock solenoid was unregistered.
NO >> GO TO 2
2.CHECK STEERING LOCK SOLENOID POWER SUPPLY-1
1. Turn ignition switch OFF.
2. Disconnect steering lock solenoid connector.
3. Check voltage between steering lock solenoid harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK STEERING LOCK SOLENOID GROUND CIRCUIT
DTC No.Trouble diagnosis
name DTC detecting condition
Possible cause
B2013 STRG COMM 1 The ID verification results between Intelligent Key
unit and steering control unit are NG. The registra-
tion is necessary.
Steering lock solenoid
Te r m i n a l s
Voltage (V)(Approx.)
(+)
(–)
Steering lock solenoid con-
nector Te r m i n a l
M15 1Ground Battery voltage
WIIA1202E
Revision: March 2010 2008 QX56

B2013 ID DISCORD I-KEY-STRGSEC-27
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Check continuity between steering lock solenoid harness connector
and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK STEERING LOCK SOLE NOID COMMUNICATION CIRCUITS
1. Disconnect Intelligent Key unit connector.
2. Check continuity between steer ing lock solenoid connector (A)
M15 terminals 2, 3 and Intelligent Key unit connector (B) M70
terminals 1, 32.
3. Check continuity between steer ing lock solenoid connector (A)
M15 terminals 2, 3 and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> Repair or replace harness.
5.CHECK INTELLIGENT KEY UNIT POWER SUPPLY-2
1. Connect Intelligent Key unit connector.
2. Check voltage between Intelligent Key unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6
NO >> Replace Intelligent Key unit. Refer to SEC-116,
"Removal and Installation".
6.CHECK STEERING LOCK SOLENOID COMMUNICATION CIRCUIT
1. Connect steering lock solenoid connector.
Te r m i n a l s
Continuity
(+)
(–)
Steering lock solenoid con-
nector Te r m i n a l
M15 4Ground Yes
WIIA1203E
Te r m i n a l s
Continuity
Steering lock sole-
noid connector Te r m i n a l
Intelligent Key unit
connector Te r m i n a l
M15 2
M70 1
Ye s
33 2
Te r m i n a l s Continuity
Steering lock solenoid connector Terminals
M15 2
Ground No
3
WIIA1206E
Te r m i n a l s
Voltage (V)
(Approx.)
(+)
(–)
Intelligent Key unit connector Terminal
M70 1Ground 5
WIIA1204E
Revision: March 2010 2008 QX56

SEC-28
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2013 ID DISCORD I-KEY-STRG
2. Using an oscilloscope, check voltage between Intelligent Key
unit connector and ground.
Is the inspection result normal?
YES >> Replace Steering lock solenoid.
NO >> Replace Intelligent Key unit. Refer to SEC-116, "
Removal and Installation".
WIIA1205E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+)
(–)
Intelligent Key
unit connector Te r m i n a l
M70 32GroundSteering
lock Ignition knob is pushed
LOCK status
5
LOCK ⇔ UNLOCK
For 15 seconds after
UNLOCK 5
15 seconds later UN-
LOCK 0
SIIA1911J
JMKIA0433ZZ
Revision: March 2010
2008 QX56

B2190, P1614 NATS ANTENNA AMP.SEC-29
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2190, P1614 NATS ANTENNA AMP.
DescriptionINFOID:0000000001539126
Performs ID verification through BCM and NATS antenna amplifier when ignition knob switch is pressed.
Prohibits the release of steering lock or start of engine when an unregistered ID of mechanical key is used.
DTC LogicINFOID:0000000001539127
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Insert mechanical key into the key cylinder.
2. Press the ignition knob switch.
3. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-29, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000001539128
1.CHECK NATS ANTENNA AMP. INSTALLATION
Check NATS antenna amp. installation. Refer to SEC-116, "
Removal and Installation".
Is the inspection result normal?
YES >> GO TO 2
NO >> Reinstall NATS antenna amp. correctly.
2.CHECK NVIS (NATS) IGNITION KEY ID CHIP
Start engine with another registered NATS ignition key.
Does the engine start?
YES >> • Ignition key ID chip is malfunctioning. • Replace the ignition key.
• Perform initialization with CONSULT-III.For initialization, refer to “CONSULT-III Operation Manual”.
NO >> GO TO 3
3.CHECK POWER SUPPLY FOR NATS ANTENNA AMP.
1. Turn ignition switch ON.
2. Check voltage between NATS antenna amp. connector M21 terminal 1 and ground.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2190
NATS ANTENNA
AMP • Inactive communication between NATS antenna
amp. and BCM.
• Mechanical key is malfunctioning. • Harness or connectors
(The NATS antenna amp. circuit is
open or shorted)
• Mechanical key
• NATS antenna amp.
•BCM
P1614
Revision: March 2010
2008 QX56

SEC-32
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2191, P1615 DIFFERENCE OF KEY
B2191, P1615 DIFFERENCE OF KEY
DescriptionINFOID:0000000001539129
Performs ID verification through BCM when ignition knob switch is pressed.
Prohibits the release of steering lock or start of engine when an unregistered ID of mechanical key is used.
DTC LogicINFOID:0000000001539130
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Insert mechanical key into the key cylinder.
2. Press the ignition knob switch.
3. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-32, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000001539131
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 >> Mechanical key was unregistered.
NO >> BCM is malfunctioning. • Replace BCM. Refer to BCS-55, "
Removal and Installation".
• Perform initialization again
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2191 DIFFERENCE OF
KEY The ID verification results between BCM and me-
chanical key are NG. The registration is necessary.
Mechanical key
P1615
Revision: March 2010 2008 QX56

B2552 INTELLIGENT KEYSEC-37
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2552 INTELLIGENT KEY
DescriptionINFOID:0000000001539141
Intelligent key unit performs engine start operation and steering lock control by crosschecking ID with the Intel-
ligent key.
DTC LogicINFOID:0000000001539142
DTC DETECTION 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:0000000001539143
1.REPLACE INTELLIGENT KEY UNIT
1. Replace Intelligent Key unit.
2. Perform initialization with CONSULT- III. Re-register all mechanical keys. Refer to “CONSULT-III Opera-
tion Manual”.
3. Start the engine.
Does the engine start?
YES >> Inspection End.
NO >> Perform “DTC confirmation procedure”. Refer to SEC-37, "
DTC Logic".
Special Repair RequirementINFOID:0000000001539144
1.REQUIRED WORK WHEN REPLACING INTELLIGENT KEY UNIT
Initialize control unit. Refer to CONSULT-III Operation Manual.
>> Work end.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2552 INTELLIGENT KEY
UNIT Malfunction is detected inside Intelligent
key unit.
Intelligent Key unit
Revision: March 2010
2008 QX56