2011 INFINITI QX56 ECO mode

SYSTEMSEC-13
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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 Up to 4 Intelligent Keys can be registered (Includi ng the standard Intelligent Key) upon request from the cus-
tomer.
NOTE:
Refer to DLK-18, "
INTELLIGENT KEY SYSTEM : System Description" for any functions other than engine
start function of Intelligent Key system.
PRECAUTIONS FOR INTELLIGENT KEY SYSTEM
The transponder [the chip for IVIS (NATS) ID verification] is integrated into the Intelligent Key. (For the
conventional models, it is integrated into the mech anical key.) Therefore, ID verification cannot be per-
formed by mechanical key only.
In that case, the IVIS (NATS) ID verification can be performed when Intelligent Key backside is con-
tacted to push-button ignition switch. If verification result is OK, engine can be started.
OPERATION WHEN INTELLIGENT KEY IS CARRIED
1. When the push-button ignition switch is pressed, the BCM activates the inside key antenna and transmits
the request signal to the Intelligent Key.
2. The Intelligent Key receives the request signal and transmits the Intelligent Key ID signal to the BCM.
3. BCM receives the Intelligent Key ID signal via remote keyless entry receiver and verifies it with the regis-
tered ID.
4. BCM transmits the unlock signal to steering lock unit and IPDM E/R if the verification results are OK.
5. IPDM E/R turns the steering lock relay ON and supplies power supply to the steering lock unit.
6. The steering lock releases.
7. BCM transmits the power supply stop signal to IPDM E/R when detecting that the steering lock is in the
unlock condition.
8. IPDM E/R turns the steering lock relay OFF and stops power supply to the steering lock unit.
9. BCM turns ACC relay ON and transmits the ignition power supply ON signal to IPDM E/R.
10. IPDM E/R turns the ignition relay ON and starts the ignition power supply.
11. BCM detects that the selector lever position and brake pedal operating condition.
12. BCM transmits the starter request signal to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM
judges that the engine start condition* is satisfied.
13. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
14. Power supply is supplied through the starter relay and the starter control relay to operate the starter motor. CAUTION:
If a malfunction is detected in the Intelligent Key system, the “KEY” warning lamp in the combina-
tion meter illuminates. At that time, the engine cannot be started.
15. When BCM receives feedback signal from ECM indicati ng that the engine is started, the BCM transmits a
stop signal to IPDM E/R and stops cranking by turning OFF the starter motor relay. (If engine start is
unsuccessful, cranking stops automatically within 5 seconds.)
CAUTION:
When the Intelligent Key is carried outside of th e vehicle (inside key antenna detection area) while
the power supply is in the ACC or ON position, even if the engine start condition* is satisfied, the
engine cannot be started.
*: For the engine start condition, refer to “POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON
IGNITION SWITCH OPERATION”.
OPERATION RANGE
Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine may not start
when Intelligent Key is on instrument panel or in glove box.
ENGINE START OPERATION WHEN INTELLIGENT KEY IS CONTACTED TO PUSH-BUTTON IG-
NITION SWITCH
When Intelligent Key battery is discharged, the IVIS (NATS) ID verification between transponder in Intelligent
Key and BCM is performed when Intelligent Key backside is contacted to push-button ignition switch. If the
verification result is OK, engine can be started.
STEERING LOCK OPERATION
Steering is locked by steering lock unit when any of the following conditions are met.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (BCM)SEC-21
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Fu nction (BCM - COMMON ITEM)INFOID:0000000006365349
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
×: Applicable item
*: This item is indicated, but not used.
FREEZE FRAME DATA (FFD)
The BCM records the following vehicle condition at the time a particular DTC is detected, and displays on
CONSULT-III.
Diagnosis mode Function Description
Work Support Changes the setting for each system function.
Self Diagnostic Result Displays the diagnosis results judged by BCM. Refer to BCS-57, "
DTCIndex".
CAN Diag Support Monitor Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.
Data Monitor The BCM input/output signals are displayed.
Active Test The signals used to activate each device are forcibly supplied from BCM.
Ecu Identification The BCM part number is displayed.
Configuration  Read and save the vehicle specification.
 Write the vehicle specification when replacing BCM.
System Sub system selection item Diagnosis mode
Work Support Data Monitor Active Test
Door lock DOOR LOCK ×××
Rear window defo gger REAR DEFOGGER ××
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ×××
— AIR CONDITONER* ××
 Intelligent Key system
 Engine start system INTELLIGENT KEY
×××
Combination switch COMB SW ×
Body control system BCM ×
IVIS IMMU ×××
Interior room lamp battery saver BATTERY SAVER ×××
Back door TRUNK ×
Vehicle security system THEFT ALM ×××
RAP system RETAINED PWR ×
Signal buffer system SIGNAL BUFFER ××
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (BCM)SEC-27
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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ACTIVE TEST
IMMU
IMMU : CONSULT-III Function (BCM - IMMU)INFOID:0000000006226190
DATA MONITOR
ACTIVE TEST
WORK SUPPORT
Service Item Description
SECURITY ALARM SET This mode is able to confirm and change security alarm ON-OFF setting.
THEFT ALM TRG The switch which triggered vehicle security alarm is recorded.
This mode is able to confirm and erase the record of vehicle security alarm.
The trigger data can be erased by touching “CLEAR” on CONSULT-III screen.
Test Item Description
THEFT IND This test is able to check security indicator lamp operation. Security indicator lamp is turned on
when “ON” on CONSULT-III screen is touched.
VEHICLE SECURITY HORN This test is able to check horn operation. Horn is activated for 0.5 seconds after “ON” on CONSULT-
III screen is touched.
HEADLAMP(HI) This test is able to check headlamp operation. Headlamps are activated for 0.5 seconds after “ON”
on CONSULT-III screen is touched.
FLASHER This test is able to check hazard warning lamp operation. Hazard warning lamps are activated after
“ON” on CONSULT-III screen is touched.
Monitor item Content
CONFRM ID ALL
Indicates [YET] at all time.
Switches to [DONE] when a registered Intelligent Key backside is contacted to push-button ignition
switch.
CONFIRM ID4
CONFIRM ID3
CONFIRM ID2
CONFIRM ID1
NOT REGISTERED
Indicates [ID OK] when key ID that is registered is received or is not yet received.
Indicates [ID NG] when key ID that is not registered is received.
TP 4
Indicates the number of IDs that are registered.
TP 3
TP 2
TP 1
PUSH SW Indicates [ON/OFF] condition of push-button ignition switch.
Test item Description
THEFT IND This test is able to check security indicator lamp operation.
Security indicator lamp is turned on when “ON” on CONSULT-III screen touched.
Service item Description
CONFIRM DONGLE ID It is possible to check that dongle unit is applied to the vehicle.
Revision: 2010 May2011 QX56

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNITSEC-51
< BASIC INSPECTION > [WITH INTELLIGENT KEY SYSTEM]
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ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
ECM
ECM : DescriptionINFOID:0000000006226197
Performing the following procedure can automatically activate recommunication of ECM and BCM, but only
when the ECM is replaced with a new one*.
*: New one means a virgin ECM that has never been energized on-board.
(In this step, initialization procedur e by CONSULT-III is not necessary)
NOTE:
 When registering new Key IDs or replacing the ECM th at is not brand new, refer to CONSULT-III Oper-
ation Manual NATS-IVIS/NVIS.
 If multiple keys are attached to the key hold er, separate them before beginning work.
 Distinguish keys with unregistered key IDs from those with registered IDs.
ECM : Work ProcedureINFOID:0000000006226198
1.PERFORM ECM RECOMMUNICATING FUNCTION
1. Install ECM.
2. Contact backside of registered Intelligent key* to push-button ignition switch, then turn power supply posi-
tion to ON.
*: To perform this step, use the key that is used before performing ECM replacement.
3. Maintain power supply position in t he ON position for at least 5 seconds.
4. Turn power supply position to OFF.
5. Check that the engine starts.
>> GO TO 2.
2.PERFORM ADDITIONAL SERVICE WHEN REPLACING ECM
Perform EC-143, "
Work Procedure".
>> END
BCM
BCM : DescriptionINFOID:0000000006397657
BEFORE REPLACEMENT
When replacing BCM, save or print current vehicle specification with CONSULT-III configuration before
replacement.
NOTE:
If “READ CONFIGURATION” can not be used, use the “WRITE CONFIGURATION - Manual selection” after
replacing BCM.
AFTER REPLACEMENT
CAUTION:
 When replacing BCM, you must perform “W RITE CONFIGURATION” with CONSULT-III.
- Complete the procedure of “WRITE CONFIGURATION” in order.
- If you set incorrect “WRITE CONF IGURATION”, incidents might occur.
- Configuration is different for each vehicle model. Confirm conf iguration of each vehicle model.
 When replacing BCM, perform the system initialization (NATS).
BCM : Work ProcedureINFOID:0000000006397658
1.SAVING VEHICLE SPECIFICATION
CONSULT-III Configuration
Perform “READ CONFIGURATION” to save or prin t current vehicle specification. Refer to BCS-67, "
CONFIG-
URATION (BCM) : Description".
NOTE:
Revision: 2010 May2011 QX56

P1610 LOCK MODESEC-53
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DTC/CIRCUIT DIAGNOSIS
P1610 LOCK MODE
DescriptionINFOID:0000000006226201
ECM forcibly switches to the mode that inhibits engi ne start, when engine start operation is performed 5 times
or more while communication between ECM and BCM is not normal.
DTC LogicINFOID:0000000006226202
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check DTC in “Self Diagnostic Result” mode of “ENGINE” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-53, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226203
1.CHECK ENGINE START FUNCTION
1. Check that DTC except fo r DTC P1610 is not detected.
If detected, erase the DTC after fixing.
2. Turn ignition switch OFF.
3. Contact the registered Intelligent Key backside to push-button ignition switch and wait 5 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait 5 seconds.
6. Repeat steps 3 and 5 twice (a total of 3 times).
7. Check that engine can start.
>> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible causeP1610 LOCK MODE When ECM detects a communication malfunction between
ECM and BCM 5 times or more.
—
Revision: 2010 May2011 QX56

B2555 STOP LAMPSEC-73
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2555 STOP LAMP
DTC LogicINFOID:0000000006226222
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Depress the brake pedal and wait 1 second or more.
2. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-73, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226223
1.CHECK STOP LAMP SWITCH INPUT SIGNAL 1
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector and ground.
Is the inspection normal?
YES >> GO TO 2.
NO-1 >> Check 10 A fuse [No. 7, lo cated in the fuse block (J/B)].
NO-2 >> Check harness for open or short between BCM and fuse.
2.CHECK STOP LAMP SWIT CH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch connector.
2. Check voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check harness for open or short between stop lamp switch and fuse.
3.CHECK STOP LAMP SWITCH INPUT SIGNAL 2
1. Connect stop lamp switch connector.
2. Check voltage between BCM harness connector and ground.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B2555 STOP LAMP BCM makes a comparison between the
upper voltage and lower voltage of stop
lamp switch. It judges from their values to
detect the malfunctioning circuit.  Harness or connectors
(Stop lamp switch circuit is open or
shorted.)
 Stop lamp switch
Fuse
BCM
(+)
(–)Voltage (V)
(Approx.)
BCM
Connector Terminal M71 105 Ground Battery voltage
(+) (–)Voltage (V)
(Approx.)
Sto p l am p s w it ch
Connector Terminal E115 1 Ground Battery voltage
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

SEC-78
< DTC/CIRCUIT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2557 VEHICLE SPEED
B2557 VEHICLE SPEED
DTC LogicINFOID:0000000006226228
DTC DETECTION LOGIC
NOTE:
 If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
BCS-70, "
DTC Logic".
 If DTC B2557 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 PROCEDURE
1. Start engine and wait 10 seconds or more.
2. Drive the vehicle at a vehicle speed of 10 km/h (6.2 MPH) or more for 10 seconds or more.
3. Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.
Is DTC detected?
YES >> Go to SEC-78, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226229
1.CHECK DTC OF “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Check DTC in “Self Diagnostic Result ” mode of “ABS” using CONSULT-III.
Is DTC detected?
YES >> Perform the trouble diagnosis relat ed to the detected DTC. Refer to BRC-51, "DTC Index".
NO >> GO TO 2.
2.CHECK DTC OF “COMBINATION METER”
Check DTC in “Self Diagnostic Result” m ode of “METER/M&A” using CONSULT-III.
Is DTC detected?
YES >> Perform the trouble diagnosis relat ed to the detected DTC. Refer to MWI-43, "DTC Index".
NO >> GO TO 3.
3.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible causes
B2557 VEHICLE SPEED BCM detects one of the following conditions for 10
seconds continuously.
 Vehicle speed signal from combination meter is 10
km/h (6.2 MPH) or more, and vehicle speed signal
from ABS actuator and electric unit (control unit) is
4 km/h (2.5 MPH) or less.
 Vehicle speed signal from combination meter is 4 km/h (2.5 MPH) or less, and vehicle speed signal
from ABS actuator and electric unit (control unit) is
10 km/h (6.2 MPH) or more.  Harness or connectors
(The CAN communication line is
open or shorted.)
 Combination meter
 ABS actuator and electric unit
(control unit)
Revision: 2010 May2011 QX56