Page 4721 of 5598
![INFINITI QX56 2011 Factory Service Manual
SEC-114
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F5 STEERING LOCK STATUS SWITCH
NO >> GO TO 2.
2.CHECK IPDM E/R INPUT SIGNAL CIRCUIT
1. Disconnect IPDM E/R connector and steering loc INFINITI QX56 2011 Factory Service Manual
SEC-114
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F5 STEERING LOCK STATUS SWITCH
NO >> GO TO 2.
2.CHECK IPDM E/R INPUT SIGNAL CIRCUIT
1. Disconnect IPDM E/R connector and steering loc](/manual-img/42/57033/w960_57033-4720.png)
SEC-114
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F5 STEERING LOCK STATUS SWITCH
NO >> GO TO 2.
2.CHECK IPDM E/R INPUT SIGNAL CIRCUIT
1. Disconnect IPDM E/R connector and steering lock unit connector.
2. Check continuity between IPDM E/R harness connector and steering lock unit harness connector.
3. Check continuity between IP DM E/R harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
3.REPLACE STEERING LOCK UNIT
1. Replace steering lock unit.
2. Perform the service procedure for steering lock unit replacement. Refer to CONSULT-III Operation Man-
ual NATS-IVIS/NVIS.
>> INSPECTION END
4.CHECK BCM INPUT SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between BCM harness connector and ground.
NOTE:
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 6.
5.REPLACE BCM
1. Replace BCM. Refer to BCS-81, "
Removal and Installation".
2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.
For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
IPDM E/R Steering lock unit
Continuity
Connector Terminal Connector Terminal
E17 63
M12 8
Existed
65 3
IPDM E/R GroundContinuity
Connector Terminal
E17 63
Not existed
65
(+)
(–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M71 107
Ground Steering lock unit Lock 0
Unlock 12
108 Lock 12
Unlock 0
To lock the steering 1. Set the selector lever in the P position.
2. Turn the power supply position to the OFF position.
3. Press any door switch.
To unlock the steering 1. Set the selector lever in the P position.
2. Press the push-button ignition switch with brake pedal not depressed.
Revision: 2010 May2011 QX56
Page 4722 of 5598
B26F5 STEERING LOCK STATUS SWITCHSEC-115
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
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SEC
N
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>> INSPECTION END
6.CHECK BCM INPUT SIGNAL CIRCUIT
1. Disconnect BCM connector and steering lock unit connector.
2. Check continuity between BCM harness connector and steering lock unit harness connector.
3. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace harness.
7.REPLACE STEERING LOCK UNIT
1. Replace steering lock unit.
2. Perform the service procedure for steering lock unit replacement. Refer to CONSULT-III Operation Man-
ual NATS-IVIS/NVIS.
>> INSPECTION END
BCM Steering lock unit Continuity
Connector Terminal Connector Terminal
M71 107
M12 3
Existed
108 8
BCM GroundContinuity
Connector Terminal
M71 107
Not existed
108
Revision: 2010 May2011 QX56
Page 4723 of 5598
![INFINITI QX56 2011 Factory Service Manual
SEC-116
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F7 BCM
B26F7 BCM
DTC LogicINFOID:0000000006226272
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE INFINITI QX56 2011 Factory Service Manual
SEC-116
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F7 BCM
B26F7 BCM
DTC LogicINFOID:0000000006226272
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE](/manual-img/42/57033/w960_57033-4722.png)
SEC-116
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F7 BCM
B26F7 BCM
DTC LogicINFOID:0000000006226272
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Press door request switch.
2. Turn ignition switch ON.
3. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-117, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226273
1.INSPECTION START
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC CONFIRMATION PROC EDURE for DTC B26F7. Refer to SEC-116, "
DTC Logic".
Is DTC detected?
YES >> GO TO 2.
NO >> INSPECTION END
2.REPLACE BCM
1. Replace BCM. Refer to BCS-81, "
Removal and Installation".
2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.
For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
>> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible cause B26F7 BCM Inside key antenna output circuit in BCM is malfunctioning. BCM
Revision: 2010 May2011 QX56
Page 4724 of 5598
![INFINITI QX56 2011 Factory Service Manual
B26F8 BCMSEC-117
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
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F
G H
I
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M A
B
SEC
N
O P
B26F8 BCM
DTC LogicINFOID:0000000006226274
DTC DETECTION LOGIC
NOTE:
DTC B26F8 can be detect INFINITI QX56 2011 Factory Service Manual
B26F8 BCMSEC-117
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
SEC
N
O P
B26F8 BCM
DTC LogicINFOID:0000000006226274
DTC DETECTION LOGIC
NOTE:
DTC B26F8 can be detect](/manual-img/42/57033/w960_57033-4723.png)
B26F8 BCMSEC-117
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
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F
G H
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B
SEC
N
O P
B26F8 BCM
DTC LogicINFOID:0000000006226274
DTC DETECTION LOGIC
NOTE:
DTC B26F8 can be detected even though the relat ed circuit is not used in this vehicle.
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait 1 second.
2. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-117, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226275
1.INSPECTION START
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of ”BCM” using CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC CONFIRMATION PROCEDURE for DTC B26F8. Refer to SEC-117, "
DTC Logic".
Is DTC detected?
YES >> GO TO 2.
NO >> INSPECTION END
2.REPLACE BCM
1. Replace BCM. Refer to BCS-81, "
Removal and Installation".
2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.
For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
>> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible cause B26F8 BCM Starter control replay control signal and feedback circuit
signal (inside BCM) does not match. BCM
Revision: 2010 May2011 QX56
Page 4725 of 5598
![INFINITI QX56 2011 Factory Service Manual
SEC-118
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F9 CRANKING REQUEST CIRCUIT
B26F9 CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226276
DTC DETECTION LOGIC
NOTE:
DTC B26F9 can INFINITI QX56 2011 Factory Service Manual
SEC-118
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F9 CRANKING REQUEST CIRCUIT
B26F9 CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226276
DTC DETECTION LOGIC
NOTE:
DTC B26F9 can](/manual-img/42/57033/w960_57033-4724.png)
SEC-118
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26F9 CRANKING REQUEST CIRCUIT
B26F9 CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226276
DTC DETECTION LOGIC
NOTE:
DTC B26F9 can be detected even though the rela
ted circuit is not used in this vehicle.
If DTC B26F9 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to BCS-70, "
DTC Logic".
If DTC B26F9 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
BCS-71, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
1. Start engine and wait 2 seconds or more at idle speed.
2. Drive vehicle for 2 seconds or more.
3. Check DTC in “Self Diagnostic Result ” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-118, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226277
1.CHECK CRANKING REQUEST SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector and ground under the following conditions.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK CRANKING REQUEST SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Disconnect ECM connector.
4. Check continuity between BCM harness connector and ECM harness connector.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B26F9 CRANK REQ CIR SHORT BCM detects that the status of the following
signals does not match.
Cranking request signal from ECM
Starter control relay control signal from
ECM (CAN) Harness or connectors
(Can communication line is open or
shorted.)
Harness or connectors (Cranking request signal circuit is open
or shorted.)
ECM
BCM
(+)
(–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M69 64 Ground Ignition switch ON Engine: Stopped
Selector lever position: P
0
Engine: Stopped
Selector lever position: Other than P 12
Engine running 12
Revision: 2010 May2011 QX56
Page 4726 of 5598
![INFINITI QX56 2011 Factory Service Manual
B26F9 CRANKING REQUEST CIRCUITSEC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
SEC
N
O P
5. Check continuity between BCM harness connector and ground.
Is the in INFINITI QX56 2011 Factory Service Manual
B26F9 CRANKING REQUEST CIRCUITSEC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
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G H
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SEC
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5. Check continuity between BCM harness connector and ground.
Is the in](/manual-img/42/57033/w960_57033-4725.png)
B26F9 CRANKING REQUEST CIRCUITSEC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
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F
G H
I
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M A
B
SEC
N
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5. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
3.REPLACE BCM
1. Replace BCM. Refer to BCS-81, "
Removal and Installation".
2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III. For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
3. Perform DTC CONFIRMATION PROCEDURE for DTC B26F9. Refer to SEC-118, "
DTC Logic".
Is DTC detected?
YES >> GO TO 4.
NO >> INSPECTION END
4.REPLACE ECM
1. Replace ECM. Refer to EC-535, "
Removal and Installation".
2. Perform “ADDITIONAL SERVICE WHEN REPLACING ECM”. Refer to EC-143, "
Work Procedure".
>> INSPECTION END
BCM ECM Continuity
Connector Terminal Connector Terminal
M69 64 E80 165 Existed
BCM GroundContinuity
Connector Terminal
M69 64 Not existed
Revision: 2010 May2011 QX56
Page 4727 of 5598
![INFINITI QX56 2011 Factory Service Manual
SEC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26FA CRANKING REQUEST CIRCUIT
B26FA CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226278
DTC DETECTION LOGIC
NOTE:
DTC B26FA can INFINITI QX56 2011 Factory Service Manual
SEC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26FA CRANKING REQUEST CIRCUIT
B26FA CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226278
DTC DETECTION LOGIC
NOTE:
DTC B26FA can](/manual-img/42/57033/w960_57033-4726.png)
SEC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B26FA CRANKING REQUEST CIRCUIT
B26FA CRANKING REQUEST CIRCUIT
DTC LogicINFOID:0000000006226278
DTC DETECTION LOGIC
NOTE:
DTC B26FA can be detected even though the related circuit is not used in this vehicle.
If DTC B26FA is displayed with DTC U1000, first
perform the trouble diagnosis for DTC U1000. Refer to
BCS-70, "
DTC Logic".
If DTC B26FA is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
BCS-71, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
1. Start engine and wait 2 seconds or more at idle speed.
2. Drive vehicle for 2 seconds or more.
3. Check DTC in “Self Diagnostic Result ” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-120, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226279
1.CHECK CRANKING REQUEST SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector and ground under the following conditions.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK CRANKING REQUEST SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Disconnect ECM connector.
4. Check continuity between BCM harness connector and ECM harness connector.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B26FA CRANK REQ CIR OPEN BCM detects that the status of the following
signals does not match.
Cranking request signal from ECM
Starter control relay
control signal from
ECM (CAN) Harness or connectors
(Can communication line is open or
shorted.)
Harness or connectors (Cranking request signal circuit is open
or shorted.)
BCM
ECM
(+)
(–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M69 64 Ground Ignition switch ON Engine: Stopped
Selector lever position: P
0
Engine: Stopped
Selector lever position: Other than P 12
Engine running 12
Revision: 2010 May2011 QX56
Page 4728 of 5598
![INFINITI QX56 2011 Factory Service Manual
B26FA CRANKING REQUEST CIRCUITSEC-121
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
SEC
N
O P
5. Check continuity between BCM harness connector and ground.
Is the in INFINITI QX56 2011 Factory Service Manual
B26FA CRANKING REQUEST CIRCUITSEC-121
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
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G H
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SEC
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5. Check continuity between BCM harness connector and ground.
Is the in](/manual-img/42/57033/w960_57033-4727.png)
B26FA CRANKING REQUEST CIRCUITSEC-121
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
SEC
N
O P
5. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
3.REPLACE BCM
1. Replace BCM. Refer to BCS-81, "
Removal and Installation".
2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III. For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
3. Perform DTC CONFIRMATION PROCEDURE for DTC B26FA. Refer to SEC-120, "
DTC Logic".
Is DTC detected?
YES >> GO TO 4.
NO >> INSPECTION END
4.REPLACE ECM
1. Replace ECM. Refer to EC-535, "
Removal and Installation".
2. Perform “ADDITIONAL SERVICE WHEN REPLACING ECM”. Refer to EC-143, "
Work Procedure".
>> INSPECTION END
BCM ECM Continuity
Connector Terminal Connector Terminal
M69 64 E80 165 Existed
BCM GroundContinuity
Connector Terminal
M69 64 Not existed
Revision: 2010 May2011 QX56