2009 INFINITI QX56 check engine

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

P1610 LOCK MODESEC-37
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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P1610 LOCK MODE
DescriptionINFOID:0000000003775916
When the starting operation is carried more than five times consecutively under the following conditions, NATS
will shift to the mode which prevents the engine from being started.
• Unregistered mechanical key is used.
• BCM or ECM's malfunctioning.
DTC LogicINFOID:0000000003775917
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:0000000003775918
1.CHECK ENGINE START FUNCTION
1. Perform the check for DTC except DTC P1610.
2. Use CONSULT-III to erase DTC after fixing.
3. Check that engine can start with registered mechanical key.
Does the engine start?
YES >> Inspection End.
NO >> GO TO 2
2.CHECK INTERMITTENT INCIDENT
Refer to GI-38, "
Intermittent Incident".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
P1610 LOCK MODE When the starting operation is carried out
five or more times consecutively under the
following conditions.
• Unregistered mechanical key
• BCM or ECM's malfunctioning. —
Revision: December 20092009 QX56

BCM (BODY CONTROL MODULE)SEC-77
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DTC Inspection Priority ChartINFOID:0000000004221477
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000004221478
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni-
tion switch OFF → ON again.
• 1 - 39: Displayed if any previous ma lfunction is present when current conditi on is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condi tion if the malfunction is detected again.
Display contents of CONSULT Fail-safe Cancellation
U1000: CAN COMM CIRCUIT I nhibit engine crankingWhen the BCM re-establishes communication with the other mod-
ules.
U1010: CONTROL UNIT (CAN) Inhibit engine cranking When the BCM re-start communicating with the other modules.
Priority DTC
1 • U1000: CAN COMM CIRCUIT
• U1010: CONTROL UNIT (CAN)
2 • B2190: NATS ANTENNA AMP
• B2191: DIFFERENCE OF KEY
• B2192: ID DISCORD BCM-ECM
• B2193: CHAIN OF BCM-ECM
• B2013: STRG COMM 1
• B2552: INTELLIGENT KEY
• B2590: NATS MALFUNCTION
3 • C1729: VHCL SPEED SIG ERR
• C1735: IGNITION SIGNAL
4 • C1704: LOW PRESSURE FL
• C1705: LOW PRESSURE FR
• C1706: LOW PRESSURE RR
• C1707: LOW PRESSURE RL
• C1708: [NO DATA] FL
• C1709: [NO DATA] FR
• C1710: [NO DATA] RR
• C1711: [NO DATA] RL
• C1712: [CHECKSUM ERR] FL
• C1713: [CHECKSUM ERR] FR
• C1714: [CHECKSUM ERR] RR
• C1715: [CHECKSUM ERR] RL
• C1716: [PRESSDATA ERR] FL
• C1717: [PRESSDATA ERR] FR
• C1718: [PRESSDATA ERR] RR
• C1719: [PRESSDATA ERR] RL
• C1720: [CODE ERR] FL
• C1721: [CODE ERR] FR
• C1722: [CODE ERR] RR
• C1723: [CODE ERR] RL
• C1724: [BATT VOLT LOW] FL
• C1725: [BATT VOLT LOW] FR
• C1726: [BATT VOLT LOW] RR
• C1727: [BATT VOLT LOW] RL
Revision: December 20092009 QX56

INTELLIGENT KEY UNITSEC-95
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Fail SafeINFOID:0000000003775938
DTC Inspection Priority ChartINFOID:0000000003775939
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000003775940
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni- tion switch OFF → ON again.
• 1 - 39: Displayed if any previous ma lfunction is present when current conditi on is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condi tion if the malfunction is detected again.
Display contents of CONSULT-III Fail-safeCancellation
B2013: STRG COMM 1 • Inhibits steering look unlocking Erase DTC
B2552: INTELLIGENT KEY • Inhibits steering look unlocking
• Inhibits engine cranking
(BCM)
•Fuel cut (ECM) Erase DTC
B2590: NATS MALFUNCTION • Inhibits steering look unlocking
• Inhibits engine cranking
(BCM)
•Fuel cut (ECM) Erase DTC
Priority
DTC
1 • U1000: CAN COMM CIRCUIT
• U1010: CONTROL UNIT (CAN)
• B2552: INTELIGENT KEY
2 • B2013: STRG COMM 1
• B2590: NATS MALFUNCTION
CONSULT display
Detection conditionFail-safe Diagnosis
No DTC is detected.
further testing
may be required. ——
—
U1000: CAN COMM CIRCUIT Intelligent Key unit cannot receive CAN communi-
cation signal continuously for 2 seconds or more.
—Check CAN communi-
cation system.
Refer to SEC-22
U1010: CONTROL UNIT (CAN)
Intelligent Key unit detects internal CAN communi-
cation circuit malfunction.
—Replace Intelligent Key
unit.
B2013: STRG COMM 1 The ID verification result between Intelligent key
unit and steering lock solenoid are NG. Or Intelligent
Key unit cannot communicate with steering lock so-
lenoid. ×
Perform steering lock
solenoid ID registration
with CONSULT-III
B2552: INTELLIGENT KEY Intelligent Key unit internal malfunction. ×Replace Intelligent Key
unit.
B2590: NATS MALFUNCTION The ID verification result between Intelligent key
unit and BCM are NG. Or Intelligent Key unit cannot
communicate with BCM. ×
Check NATS
Refer to SEC-36
Revision: December 20092009 QX56

SEC-104
< SYMPTOM DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY SYSTEM/ENGIN
E START FUNCTION SYMPTOMS
SYMPTOM DIAGNOSIS
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION SYMPTOMS
Symptom TableINFOID:0000000003775944
NOTE:
• Before performing the diagnosis in the following table, check “ SEC-3, "
Work Flow"”.
• Check that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and check each symptom.
• Engine cranking is enabled when the shift lever is in the "Park" position, and in the "Neutral" position only if
the brake pedal is depressed.
• If the following symptoms are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
CONDITIONS OF VEHICLE (OPERATING CONDITIONS)
• Engine start function is ON when setting on CONSULT-III.
• Mechanical key is not inserted in key cylinder.
• One or more of Intelligent Keys with registered Intelligent Key ID is in the vehicle.
Symptom Diagnosis/service procedureReference
page
Ignition switch does not turn on with Intelligent Key.
[LCD displays "KEY DETECTED"] 1. Check steering lock solenoid.
DLK-99
2. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with Intelligent Key.
[LCD does not display "PUSH" with arrow toward key
cylinder] 1. Check Intelligent Key unit power supply and ground circuit.
DLK-682. Check ignition knob switch.DLK-116
3. Check key switch (BCM input).DLK-115
4. Check key switch (Intelligent Key unit input).DLK-113
5. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with Intelligent Key.
[LCD displays " NO KEY"]1a. Check inside key antenna 1 (rear of center console).
DLK-60
1b. Check inside key antenna 2 (luggage compartment).DLK-62
1c. Check inside key antenna 3 (front of center console).DLK-64
1d. Check inside key antenna 4 (overhead console area).DLK-68
2. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with mechanical key1. Check key switch (BCM input).
DLK-1152. Check key switch (Intelligent Key unit input).DLK-113
Engine cannot be cranked with transmission in "Park"
or in "Neutral" position with brake pedal depressed.1. Check transmission signal.
TM-44
2. Check stop lamp switch.EXL-91
Revision: December 20092009 QX56

PRE-INSPECTION FOR DIAGNOSTICSEC-107
< ON-VEHICLE MAINTENANCE > [WITH INTELLIGENT KEY SYSTEM]
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ON-VEHICLE MAINTENANCE
PRE-INSPECTION FOR DIAGNOSTIC
Basic InspectionINFOID:0000000003775947
The engine start function, door lock function, power distribution system and NATS-IVIS/NMS 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 i dentify 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 system by performing the vehicle security operation check
after basic inspection.
1.CHECK DOOR LOCK OPERATION
Check the door lock for normal operation with the Intelligent 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-206, "
Symptom Table".
2.CHECK ENGINE STARTING
Checks that the engine starts when operating the Intelligent Key.
Does the engine start?
YES >> GO TO 3.
NO >> Refer to SEC-104, "
Symptom Table".
3.CHECK STEERING LOCKING
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-71, "
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-42, "
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 t he 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-107, "
Vehicle Security Operation Check".
Vehicle Security Operation CheckINFOID:0000000003775948
1.INSPECTION START
Turn ignition switch “OFF”.
NOTE:
Before starting operation check, open front windows.
Revision: December 20092009 QX56