2011 INFINITI QX56 air condition

P1614 CHAIN OF IMMU-KEYSEC-57
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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3. Check continuity between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Repair or replace harness.
4.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 1
1. Connect NATS antenna amp. connector.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 1
1. Disconnect NATS antenna amp. connector.
2. Check continuity between BCM harness connector and NATS antenna amp. connector.
3. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace NATS antenna amp. Refer to SEC-155, "Removal and Installation".
NO >> Repair or replace harness.
6.CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 1
1. Connect BCM connector.
2. Check voltage between BCM harness connector and ground using analog tester.
Is the inspection result normal?
IPDM E/R NATS antenna amp. Continuity
Connector Terminal Connector Terminal
E14 42 M26 1 Existed
IPDM E/R GroundContinuity
Connector Terminal
E14 42 Not existed
(+) (–)Voltage (V)
(Approx.)
BCM
Connector Terminal M68 21 Ground 12
BCM NATS antenna amp. Continuity
Connector Terminal Connector Terminal
M6821M26 2Existed
BCM GroundContinuity
Connector Terminal
M68 21 Not existed
(+) (–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M68 21 Ground Contact Intelligent Key backside to
push-button ignition switch, then turn
ignition switch ON.Just after pressing push-button ignition
switch, pointer of analog tester should
move.
Revision: 2010 May2011 QX56

SEC-58
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
P1614 CHAIN OF IMMU-KEY
YES >> GO TO 7.
NO >> Replace NATS antenna amp. Refer to
SEC-155, "
Removal and Installation".
7.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 2
1. Disconnect BCM connector.
2. Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 2
1. Disconnect NATS antenna amp. connector.
2. Check continuity between BCM harness connector and NATS antenna amp. connector.
3. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace NATS antenna amp. Refer to SEC-155, "Removal and Installation".
NO >> Repair or replace harness.
9.CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 2
1. Connect BCM connector.
2. Check voltage between BCM harness connector and ground using analog tester.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace NATS antenna amp. Refer to SEC-155, "
Removal and Installation".
10.CHECK NATS ANTENNA AMP. GROUND CIRCUIT
1. Disconnect NATS antenna amp. connector.
2. Check continuity between NATS antenna amp. harness connector and ground.
Is the inspection result normal?
(+) (–)Voltage (V)
(Approx.)
BCM
Connector Terminal M68 25Ground12
BCM NATS antenna amp. Continuity
Connector Terminal Connector Terminal
M6825M26 3Existed
BCM GroundContinuity
Connector Terminal
M68 25 Not existed
(+) (–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M68 25 Ground Contact Intelligent Key backside to
push-button ignition switch, then turn
ignition switch ON.Just after pressing push-button ignition
switch, pointer of analog tester should
move.
NATS antenna amp.
GroundContinuity
Connector Terminal
M26 4 Existed
Revision: 2010 May2011 QX56

B2198 NATS ANTENNA AMP.SEC-65
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2198 NATS ANTENNA AMP.
DTC LogicINFOID:0000000006226216
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE 1
1. Contact Intelligent Key backside to push-button ignition switch.
2. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-65, "Diagnosis Procedure".
NO >> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE 2
1. Press the push-button ignition switch.
2. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-65, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226217
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check that the following fuse in IPDM E/R is not blown.
Is the fuse fusing?
YES >> Replace the blown fuse after repairing the cause of blowing.
NO >> GO TO 2.
2.CHECK NATS ANTENNA AMP. POWER SUPPLY
1. Disconnect NATS antenna amp. connector.
2. Check voltage between NATS antenna amp. harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK NATS ANTENNA AMP. POWER SUPPLY CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check continuity between IPDM E/R har ness connector and NATS antenna amp. connector.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B2198 NATS ANTENNA AMP. Inactive communication between NATS
antenna amp. and BCM  Harness or connectors
(NATS antenna amp. circuit is open or
shorted.)
 NATS antenna amp.
IPDM E/R
Signal name Fuse No.
Battery power supply 43
(+) (–)Voltage (V)
(Approx.)
NATS antenna amp.
Connector Terminal M26 1 Ground Battery voltage
Revision: 2010 May2011 QX56

SEC-66
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2198 NATS ANTENNA AMP.
3. Check continuity between IP
DM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Repair or replace harness.
4.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 1
1. Connect NATS antenna amp. connector.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 1
1. Disconnect NATS antenna amp. connector.
2. Check continuity between BCM harness connector and NATS antenna amp. connector.
3. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace NATS antenna amp. Refer to SEC-155, "Removal and Installation".
NO >> Repair or replace harness.
6.CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 1
1. Connect BCM connector.
2. Check voltage between BCM harness connector and ground using analog tester.
Is the inspection result normal?
IPDM E/R NATS antenna amp. Continuity
Connector Terminal Connector Terminal
E14 42 M26 1 Existed
IPDM E/R GroundContinuity
Connector Terminal
E14 42 Not existed
(+) (–)Voltage (V)
(Approx.)
BCM
Connector Terminal M68 21Ground12
BCM NATS antenna amp. Continuity
Connector Terminal Connector Terminal
M6821M26 2Existed
BCM GroundContinuity
Connector Terminal
M68 21 Not existed
(+) (–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M68 21 Ground Contact Intelligent Key backside to
push-button ignition switch, then turn
ignition switch ON.Just after pressing push-button ignition
switch, pointer of analog tester should
move.
Revision: 2010 May2011 QX56

B2198 NATS ANTENNA AMP.SEC-67
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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YES >> GO TO 7.
NO >> Replace NATS antenna amp. Refer to SEC-155, "
Removal and Installation".
7.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 2
1. Disconnect BCM connector.
2. Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 2
1. Disconnect NATS antenna amp. connector.
2. Check continuity between BCM harness connector and NATS antenna amp. connector.
3. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace NATS antenna amp. Refer to SEC-155, "Removal and Installation".
NO >> Repair or replace harness.
9.CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 2
1. Connect BCM connector.
2. Check voltage between BCM harness connector and ground using analog tester.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace NATS antenna amp. Refer to SEC-155, "
Removal and Installation".
10.CHECK NATS ANTENNA AMP. GROUND CIRCUIT
1. Disconnect NATS antenna amp. connector.
2. Check continuity between NATS antenna amp. harness connector and ground.
Is the inspection result normal?
(+)
(–)Voltage (V)
(Approx.)
BCM
Connector Terminal M68 25 Ground 12
BCM NATS antenna amp. Continuity
Connector Terminal Connector Terminal
M68 25 M26 3 Existed
BCM GroundContinuity
Connector Terminal
M68 25 Not existed
(+) (–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M68 25 Ground Contact Intelligent Key backside to
push-button ignition switch, then turn
ignition switch ON.Just after pressing push-button ignition
switch, pointer of analog tester should
move.
NATS antenna amp.
GroundContinuity
Connector Terminal
M26 4 Existed
Revision: 2010 May2011 QX56

B2014 CHAIN OF STRG-IMMUSEC-71
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace harness.
3.CHECK STEERING LOCK UNIT GROUND CIRCUIT
Check continuity between steering lock unit and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness.
4.CHECK STEERING LOCK UNI T COMMUNICATION SIGNAL
1. Connect steering lock unit connector and BCM connector.
2. Read voltage signal between steering lock unit harness connector and ground.
NOTE:
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 6.
5.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.
Steering lock unit
GroundContinuity
Connector Terminal
M12 7 Not existed
Steering lock unit
GroundContinuity
Connector Terminal
M12 5
Existed
6
(+)
(–) Condition Voltage (V)
(Approx.)
Steering lock unit
Connector Terminal
M12 2 Ground Steering lock unit Lock status 12
Lock or unlock
For 15 seconds after
unlock
12
15 seconds or later
after 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.
JMKIA0066GB
Revision: 2010 May2011 QX56

SEC-74
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2555 STOP LAMP
Is the inspecting result normal?
YES >> GO TO 4.
NO >> GO TO 5.
4.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
5.CHECK STOP LAMP SWITCH CIRCUIT
1. Disconnect stop lamp switch connector.
2. Check continuity between stop lamp swit ch harness connector and BCM harness connector.
3. Check continuity between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness.
6.CHECK STOP LAMP SWITCH
Refer to SEC-74, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace stop lamp switch. Refer to BR-20, "
Removal and Installation".
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006226224
1.CHECK STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch connector.
3. Check continuity between stop lamp switch terminals.
(+)
(–) Condition Voltage (V)
(Approx.)
BCM
Connector Terminal
M68 9 Ground Brake pedal Depressed Battery voltage
Not depressed 0
St op la mp sw i tc h BC M Continuity
Connector Terminal Connector Terminal
E115 2 M68 9 Existed
Stop lamp switch GroundContinuity
Connector Terminal
E115 2 Not existed
Revision: 2010 May2011 QX56

SEC-76
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2556 PUSH-BUTTON IGNITION SWITCH
B2556 PUSH-BUTTON IGNITION SWITCH
DTC LogicINFOID:0000000006226225
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Press push-button ignition switch under the following condition.
- Brake pedal: Not depressed
2. Release push-button ignition switch and wait 100 seconds or more.
3. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-76, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226226
1.CHECK PUSH-BUTTON IGNITION SWITCH INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect push-button ignition switch connector.
3. Check voltage between push-button ignition switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT
1. Disconnect BCM connector and IPDM E/R connector.
2. Check continuity between push-button ignition switch harness connector and BCM harness connector.
3. Check continuity between push-button ignition switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause B2556 PUSH-BTN IGN SW BCM detects the push-button ignition switch
stuck at ON for 100 seconds or more.  Harness or connectors
(Push-button ignition switch circuit is
shorted.)
 Push-button ignition switch
BCM
(+)
(–)Voltage (V)
(Approx.)
Push-button ignition switch
Connector Terminal M101 4 Ground 12
Push-button ignition switch BCM Continuity
Connector Terminal Connector Terminal
M101 4 M71 100 Existed
Push-button ignition switch GroundContinuity
Connector Terminal
M101 4 Not existed
Revision: 2010 May2011 QX56