2009 INFINITI QX56 key

B2190, P1614 NATS ANTENNA AMP.SEC-29
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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6.CHECK NATS ANTENNA AMP. SIGNAL LINE- 2
Check voltage between NATS antenna amp. connector M21 terminal
4 and ground with analog tester.
Is the inspection result normal?
YES >> NATS antenna amp. is malfunctioning.
NO >> • Repair or replace harness. NOTE:
If harness is OK, replace BCM, refer to BCS-56, "
Removal and Installation". Perform initializa-
tion with CONSULT-III. For initialization, refer to “CONSULT-III Operation Manual”.
LIIA1282E
Te r m i n a l s
Position of ignition key cylinder Voltage (V)
(Approx.)
( + ) ( - )
4G ro u nd Before inserting ignition key
Battery voltage
After inserting ignition key Pointer of tester should move for approx. 30 seconds,
then return to battery voltage
Just after turning ignition switch ON Pointer of tester should move for approx. 1 second, then
return to battery voltage
Revision: December 20092009 QX56

SEC-30
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2191, P1615 DIFFERENCE OF KEY
B2191, P1615 DIFFERENCE OF KEY
DescriptionINFOID:0000000003775897
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:0000000003775898
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-30, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775899
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-56, "
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: December 20092009 QX56

B2192, P1611 ID DISCORD, IMMU-ECMSEC-31
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2192, P1611 ID DISCORD, IMMU-ECM
DescriptionINFOID:0000000003775900
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:0000000003775901
DTC DETECTION LOGIC
NOTE:
• If DTC B2192 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
SEC-22, "
DTC Logic".
• If DTC B2192 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
SEC-23, "
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-31, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775902
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-56, "
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 BCM-
ECM The ID verification results between BCM and ECM
are NG. The registration is necessary. •BCM
•ECM
P1611
Revision: December 20092009 QX56

SEC-32
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2192, P1611 ID DI
SCORD, IMMU-ECM
>> Inspection End.
Revision: December 20092009 QX56

B2193, P1612 CHAIN OF ECM-IMMUSEC-33
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2193, P1612 CHAIN OF ECM-IMMU
DescriptionINFOID:0000000003775903
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:0000000003775904
DTC DETECTION LOGIC
NOTE:
• If DTC B2193 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
SEC-22, "
DTC Logic".
• If DTC B2193 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
SEC-23, "
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-33, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775905
1.REPLACE BCM
1. Replace BCM. Refer to BCS-56, "
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 BCM-
ECM Inactive communication between ECM and BCM • Harness or connectors
(The CAN communication line is
open or short)
•BCM
•ECM
P1612
Revision: December 20092009 QX56

SEC-34
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2194 ID DISCORD IMMU-I-KEY
B2194 ID DISCORD IMMU-I-KEY
DescriptionINFOID:0000000003775906
BCM performs the ID verification with Intelligent Key unit that allows the engine to start. BCM starts the com-
munication with Intelligent Key unit if ignition switch is turned ON and starts the engine if the ID is OK. BCM
prevents the engine from starting if the ID is not registered.
DTC LogicINFOID:0000000003775907
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-34, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775908
1.PERFORM INITIALIZATION
1. Perform initialization with CONSULT-III. Re-register all mechanical keys. For initialization and registration of mechanical key. Refer to “CONSULT-III Operation Manual”.
2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> GO TO 2
NO >> ID was unregistered.
2.REPLACE BCM
1. Turn ignition switch OFF.
2. Replace BCM. Refer to BCS-56, "
Removal and Installation".
3. 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?
YES >> BCM is malfunctioning.
NO >> GO TO 3
3.CHECK INTERMITTENT INCIDENT
Refer to GI-38, "
Intermittent Incident".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2194 DISCORD BCM-I-
KEY The ID verification results between BCM and Intel-
ligent Key unit are NG. The registration is neces-
sary. •BCM
• Intelligent Key unit
Revision: December 20092009 QX56

B2552 INTELLIGENT KEYSEC-35
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2552 INTELLIGENT KEY
DescriptionINFOID:0000000003775909
Intelligent key unit performs engine start operation and steering lock control by crosschecking ID with the Intel-
ligent key.
DTC LogicINFOID:0000000003775910
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-35, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775911
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-35, "
DTC Logic".
Special Repair RequirementINFOID:0000000003775912
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: December 20092009 QX56

SEC-36
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2590 ID DISCORD BCM-I-KEY
B2590 ID DISCORD BCM-I-KEY
DescriptionINFOID:0000000003775913
Intelligent Key unit performs the ID verification with BCM that allows the engine to start. BCM starts the engine
if the ID is OK and prevents the engine from
starting if the ID is not registered.
DTC LogicINFOID:0000000003775914
DTC DETECTION LOGIC
NOTE:
• If DTC B2590 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
SEC-22, "
DTC Logic".
• If DTC B2590 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-23, "
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-36, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775915
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 >> BCM is malfunctioning. • Replace BCM. Refer to BCS-56, "
Removal and Installation".
• Perform initialization again
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2590 ID DISCORD BCM-I-
KEY The ID verification results between BCM and Intel-
ligent Key unit are NG. The registration is neces-
sary. •BCM
• Intelligent Key unit
Revision: December 20092009 QX56