2011 INFINITI QX56 steering

COMPONENT PARTSSEC-9
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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Then, when the power supply position is turned ON, BCM performs ID verification between BCM and ECM. If
the ID verification result is OK, ECM can start engine.
ECMINFOID:0000000006226155
ECM controls the engine.
When power supply position is turned ON, BCM starts communication with ECM and performs the ID verifica-
tion between BCM and ECM.
If the verification result is OK, the engine can start. If the verification result is NG, the engine can not start.
IPDM E/RINFOID:0000000006226156
IPDM E/R has steering lock relay, starter relay and starte r control relay inside. Steering lock relay is used for
the steering lock/unlock function. Starter relay and star ter control relay are used for the engine starting func-
tion. IPDM E/R controls these relays while communicating with BCM.
NATS Antenna Amp.INFOID:0000000006226157
The ID verification is performed between BCM and transponder in Intelligent Key via NATS antenna amp.
when Intelligent Key backside is contacted to push-button i gnition switch in case that Intelligent Key battery is
discharged. If the ID verification result is OK, the release of steering lock and the operation of starting engine
is available.
TCMINFOID:0000000006226158
TCM transmits the shift position signal (P/N position) to BCM and IPDM E/R. And further, TCM transmits the
shift position signal (P/N position) to BCM via CAN communication.
BCM confirms the A/T shift selector position with the following 5 signals.
 P position signal from A/T shift selector (detention switch)
 P/N position signal from TCM
 P position signal from IPDM E/R (CAN)
 P/N position signal from IPDM E/R (CAN)
 P/N position signal from TCM (CAN)
IPDM E/R confirms the A/T shift sele ctor position with the following 3 signals.
 P position signal from A/T shift selector (detention switch)
 P/N position signal from TCM
 P/N position signal from BCM (CAN)
Combination MeterINFOID:0000000006226159
Combination meter transmits the vehicle speed signal to BCM via CAN communication.
BCM also receives the vehicle speed signal from ABS ac tuator and electric unit (control unit) via CAN commu-
nication. BCM compares both signals to detect the vehicle speed.
Door SwitchINFOID:0000000006226160
Door switch detects door open/close condition and then transmits ON/OFF signal to BCM.
Hood SwitchINFOID:0000000006226161
Hood switch detects that hood is open, and then transmits the signal to IPDM E/R. IPDM E/R transmits hood
switch signal to BCM via CAN communication.
Inside Key AntennaINFOID:0000000006226162
Inside key antenna detects whether Intelligent Key is inside the vehicle, and transmits the signal to BCM.
Three inside key antennas are installed in t he instrument center, console and luggage room.
Intelligent KeyINFOID:0000000006226163
Each Intelligent key has an individual electronic ID , and transmits the ID signal by request from BCM.
Carrying the Intelligent Key whose ID is registered in BCM, the driver can performs door lock/unlock operation
and push-button ignition switch operation.
Revision: 2010 May2011 QX56

SEC-10
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
COMPONENT PARTS
Push-button Ignition Switch
INFOID:0000000006226165
Push-button ignition switch detects that push-button is pressed, and then transmits the signal to BCM. BCM
changes the power supply position with the operation of push-button ignition switch. BCM maintains the power
supply position status while push-button is not operated.
Remote Keyless Entry ReceiverINFOID:0000000006226166
Remote keyless entry receiver receives each button oper ation signal and electronic key ID signal from Intelli-
gent Key, and then transmits the signal to BCM.
Security Indicator LampINFOID:0000000006226167
Security indicator lamp is located on combination meter.
Security indicator lamp blinks when power supply position is any position other than ON to warn that INFINITI
VEHICLE IMMOBILIZER SYSTEM-N ATS [IVIS (NATS)] is on board.
Starter Control RelayINFOID:0000000006226170
Engine starting system functions by controlling both starter relay and starter control relay.
Both relays are integrated in IPDM E/R. Starter relay is controlled by BCM, and starter control relay is con-
trolled by IPDM E/R on request from BCM.
IPDM E/R transmits starter relay and starter control relay status signal to BCM via CAN communication.
Starter RelayINFOID:0000000006226171
Engine starting system functions by controlling both starter relay and starter control relay.
Both relays are integrated in IPDM E/R. Starter relay is controlled by BCM, and starter control relay is con-
trolled by IPDM E/R on request from BCM.
IPDM E/R transmits starter relay and starter control relay status signal to BCM via CAN communication.
Steering Lock RelayINFOID:0000000006226172
Steering lock relay is integrated in IPDM E/R, and supplies power source to steering lock unit.
When IPDM E/R receives the steering lock relay ON request signal from BCM, IPDM E/R turns ON steering
lock relay and then transmits the steering lock relay condition signal to BCM.
Steering Lock UnitINFOID:0000000006226173
Steering lock unit performs steering lock/unlock operation on request from BCM, and power source is supplied
from steering lock relay integrated in IPDM E/R.
When push-button ignition switch is pressed while the In telligent Key is inside the vehicle, BCM performs the
ID verification with steering lock unit. Steering lock unit releases the steering lock based on the result of the ID
verification.
Steering lock unit has 2 switches (steering lock status switch and steering unlock status switch) inside. BCM
judges the steering lock/unlock condition by comparing these switch signals and steering lock unit status sig-
nal transmitted from IPDM E/R via CAN communication.
Stop Lamp SwitchINFOID:0000000006226174
Stop lamp switch detects that brake pedal is depressed, and then transmits the signal to BCM.
Transmission Range SwitchINFOID:0000000006226175
Transmission range switch is integrated in A/T asse mbly, and detects the A/T shift selector position.
TCM receives the transmission range switch signal and then transmits the P/N position signal to BCM and
IPDM E/R.
BCM confirms the A/T shift selector position with the following 5 signals.
 P position signal from A/T shift selector (detention switch)
 P/N position signal from TCM
 P position signal from IPDM E/R (CAN)
 P/N position signal from IPDM E/R (CAN)
 P/N position signal from TCM (CAN)
IPDM E/R confirms the A/T shift select or position with the following 3 signals.
Revision: 2010 May2011 QX56

SEC-12
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
SYSTEM
SYSTEM
INTELLIGENT KEY SYSTEM
/ENGINE START FUNCTION
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION : System Diagram
INFOID:0000000006226178
INTELLIGENT KEY SYSTEM/ENGINE STAR T FUNCTION : System Description
INFOID:0000000006226179
SYSTEM DESCRIPTION
 The engine start function of Intelligent Key system makes it possible to start and stop the engine without
using the key, based on the electronic ID verification. The electronic ID verification is performed between
BCM and Intelligent Key when the push-button ignition swit ch is pressed while the Intelligent Key is within
the detection area of inside key antenna.
NOTE:
The driver should carry the Intelligent Key at all times.
 Intelligent Key has 2 IDs [Intelligent Key ID and IVIS (NATS) ID]. It can perform the door lock/unlock opera-
tion and the push-button ignition switch operation when the registered Intelligent Key is carried.
 When Intelligent Key battery is discharged, engine c an be started by operating push-button ignition switch
after contacting Intelligent Key backside to push-button igni tion switch. At that time, the IVIS (NATS) ID veri-
fication is performed.
 If the ID is successfully verified, when push-button igni tion switch is pressed, steering lock is released and
the engine can be started.
JMKIA5239GB
Revision: 2010 May2011 QX56

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

SEC-16
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
SYSTEM
PRECAUTIONS FOR KEY REGISTRATION
 The ID registration is a procedure that erases the cu
rrent IVIS (NATS) ID once, and then reregisters a new
ID. Therefore before starting the registration operation, collect all registered Intelligent Keys from the cus-
tomer.
 When registering the Intelligent Key, perform only one procedure to simultaneously register both ID [IVIS
(NATS) ID and Intelligent Key ID].
SECURITY INDICATOR LAMP
 Warns that the vehicle is equipped with IVIS (NATS).
 Security indicator lamp always blinks when the pow er supply position is any position other than ON.
NOTE:
Because security indicator lamp is highly efficient, the battery is barely affected.
ENGINE START OPERATION WHEN INTELLIGENT KEY IS CONTACTED TO PUSH-BUTTON IG-
NITION SWITCH
1. When brake pedal is depressed while selector leve r is in the P position, BCM activates NATS antenna
amp. that is located behind push-button ignition switch.
2. When Intelligent Key (transponder built-in) backsi de is contacted to push-button ignition switch, BCM
starts IVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.
3. When the IVIS (NATS) ID verification result is OK, buzzer in combination meter sounds and BCM trans-
mits the result to ECM.
4. When push-button ignition switch is pressed, BCM transmits steering unlock signal to steering lock unit
and IPDM E/R.
5. IPDM E/R turns steering lock relay ON and supplies power supply to the steering lock unit.
6. The steering lock is released.
7. BCM transmits the power supply stop signal to IPDM E/R when detecting that the steering lock is in the
unlock position.
8. IPDM E/R turns steering lock relay OFF and stops power supply to the steering lock unit.
9. BCM turns ACC relay ON and transmits 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 is P or N.
12. BCM transmits 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.
15. When BCM receives feedback signal from ECM indica ting that the engine is started, BCM transmits a
stop signal to IPDM E/R and stops cranking by turning off the starter motor relay. (If engine start is unsuc-
cessful, cranking stops automatically within 5 seconds.)
*: For the engine start condition, refer to “POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON
IGNITION SWITCH OPERATION” below.
POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERA-
TION
The power supply position changing operation can be performed with the following operations.
NOTE:
 When an Intelligent Key is within the detection area of inside key antenna and when Intelligent Key backside
is contacted to push-button ignition switch, it is equivalent to the operations below.
 When starting the engine, the BCM monitors under the engine start conditions,
- Brake pedal operating condition
- Selector lever position
- Vehicle speed
Vehicle speed: less than 4 km/h (2.5 MPH)
Revision: 2010 May2011 QX56

SEC-22
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
DIAGNOSIS SYSTEM (BCM)
INTELLIGENT KEY
INTELLIGENT KEY : CONSULT-III F
unction (BCM - INTELLIGENT KEY)INFOID:0000000006365350
WORK SUPPORT
CONSULT screen item Indication/Unit Description
Vehicle Speed km/h Vehicle speed of the moment a particular DTC is detected
Odo/Trip Meter km Total mileage (Odometer value) of the moment a particular DTC is detected
Vehicle Condition SLEEP>LOCK
Power position status of
the moment a particular
DTC is detected While turning BCM status from low power consumption mode to
normal mode (Power supply position is “LOCK”)
SLEEP>OFF While turning BCM status from low power consumption mode to
normal mode (Power supply position is “OFF”.)
LOCK>ACC While turning power supply position from “LOCK” to “ACC”
ACC>ON While turning power supply position from “ACC” to “IGN”
RUN>ACC While turning power supp
ly position from “RUN” to “ACC” (Vehicle
is stopping and selector lever is except P position.)
CRANK>RUN While turning power su
pply position from “CRANKING” to “RUN”
(From cranking up the engine to run it)
RUN>URGENT While turning power supply positi
on from “RUN“ to “ACC” (Emer-
gency stop operation)
ACC>OFF While turning power supply position from “ACC” to “OFF”
OFF>LOCK While turning power supply position from “OFF” to “LOCK”
OFF>ACC While turning power supply position from “OFF” to “ACC”
ON>CRANK While turning power supply position from “IGN” to “CRANKING”
OFF>SLEEP While turning BCM status from normal mode (Power supply posi-
tion is “OFF”.) to low power consumption mode
LOCK>SLEEP While turning BCM status from normal mode (Power supply posi-
tion is “LOCK”.) to low power consumption mode
LOCK Power supply position is “LOCK”
(Ignition switch OFF with steer-
ing is locked.)
OFF Power supply position is “OFF” (Ignition switch OFF with steering
is unlocked.)
ACC Power supply position is “ACC” (Ignition switch ACC)
ON Power supply position is “IGN” (Ignition switch ON with engine
stopped)
ENGINE RUN Power supply position is “RUN” (Ignition switch ON with engine
running)
CRANKING Power supply position is “CRANKING” (At engine cranking)
IGN Counter 0 - 39 The number of times that ignition switch is turned ON after DTC is detected
 The number is 0 when a malfunction is detected now.
 The number increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition
whenever ignition switch OFF → ON.
 The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.
Monitor item Description
INSIDE ANT DIAGNOSIS This function allows inside key antenna self-diagnosis
LOCK/UNLOCK BY I-KEY Door lock/unlock function by door request switch mode can be changed to operation in this
mode
 On: Operate
 Off: Non-operation
Revision: 2010 May2011 QX56

SEC-24
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
DIAGNOSIS SYSTEM (BCM)
SELF-DIAG RESULT
Refer to
BCS-57, "DTCIndex".
DATA MONITOR
PW DOWN SET Unlock button pressing time on Intelligent Key button can be selected from the following with
this mode
 MODE 1: 3 sec
 MODE 2: Non-operation
 MODE 3: 5 sec
WELCOME LIGHT SELECT Welcome light function mode can be selected from the following with this mode
 Puddle/Outside Handle
 Room lamp
 Head & Tail Lamps (this item is displayed, but cannot be used)
 Heart Beat
WELCOME LIGHT OP SET Welcome light function mode can be changed to operation with this mode
 On: Operate
 Off: Non-operation
Monitor item Description
Monitor Item Condition
REQ SW -DR Indicates [On/Off] condition of door request switch (driver side)
REQ SW -AS Indicates [On/Off] condition of door request switch (passenger side)
REQ SW -BD/TR Indicates [On/Off] condition of back door request switch
PUSH SW Indicates [On/Off] condition of push-button ignition switch
CLUTCH SW NOTE:
This item is displayed, but cannot be monitored
BRAKE SW 1 Indicates [On/Off]* condition of stop lamp switch power supply
BRAKE SW 2 Indicates [On/Off] condition of stop lamp switch
DETE/CANCL SW Indicates [On/Off] condition of P position
SFT PN/N SW Indicates [On/Off] condition of P or N position
S/L -LOCK Indicates [On/Off] condition of steering lock unit (LOCK)
S/L -UNLOCK Indicates [On/Off] condition of steering lock unit (UNLOCK)
S/L RELAY -F/B Indicates [On/Off] condition of steering lock relay
UNLK SEN -DR Indicates [On/Off] condition of driver door UNLOCK status
PUSH SW -IPDM Indicates [On/Off] condition of push-button ignition switch
IGN RLY1 -F/B Indicates [On/Off] condition of ignition relay 1
DETE SW -IPDM Indicates [On/Off] condition of P position
SFT PN -IPDM Indicates [On/Off] condition of P or N position
SFT P -MET Indicates [On/Off] condition of P position
SFT N -MET Indicates [On/Off] condition of N position
ENGINE STATE Indicates [Stop/Stall/Crank/Run] condition of engine states
S/L LOCK-IPDM Indicates [On/Off] condition of steering lock unit (LOCK)
S/L UNLK-IPDM Indicates [On/Off] condition of steering lock unit (UNLOCK)
S/L RELAY-REQ Indicates [On/Off] condition of steering lock relay
VEH SPEED 1 Display the vehicle speed signal received from combination meter by numerical value [Km/h]
VEH SPEED 2 Display the vehi cle speed signal received from ABS or VDC or TCM by numerical value [Km/h]
DOOR STAT-DR Indicates [LOCK/READY/UNLK] condition of unlock sensor
DOOR STAT-AS Indicates [LOCK/READY/UNLK] condition of passenger side door status
ID OK FLAG Indicates [Set/Reset] condition of key ID
PRMT ENG STRT Indicates [Set/Reset] condition of engine start possibility
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (BCM)SEC-25
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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*: OFF is displayed when brake pedal is depressed while brake switch power supply is OFF.
ACTIVE TEST
PRMT RKE STRT NOTE:
This item is displayed, but cannot be monitored
TRNK/HAT MNTR NOTE:
This item is displayed, but cannot be monitored
RKE-LOCK Indicates [On/Off] condition of LOCK signal from Intelligent Key
RKE-UNLOCK Indicates [On/Off] condition of UNLOCK signal from Intelligent Key
RKE-TR/BD NOTE:
This item is displayed, but cannot be monitored
RKE-PANIC Indicates [On/Off] condition of PANIC button of Intelligent Key
RKE-MODE CHG Indicates [On/Off] condition of MODE CHANGE signal from Intelligent Key
RKE OPE COUN1 When remote keyless entry receiver receives the signal transmitted while operating on Intelli-
gent Key, the numerical value start changing
RKE OPE COUN2 NOTE:
This item is displayed, but cannot be monitored
Monitor Item Condition
Test item Description
BATTERY SAVER This test is able to check interior room lamp operation
 On: Operate
 Off: Non-operation
OUTSIDE BUZZER This test is able to check Intelligent Key warning buzzer operation
 On: Operate
 Off: Non-operation
INSIDE BUZZER This test is able to check warning chime in combination meter operation
 Take Out: Take away warning chime sounds when CONSULT-III screen is touched
 Key: Key warning chime sounds when CONSULT-III screen is touched
 Knob: OFF position warning chime sounds when CONSULT-III screen is touched
 Off: Non-operation
INDICATOR This test is able to check warning lamp operation
 KEY ON: “KEY” Warning lamp illuminates when CONSULT-III screen is touched
 KEY IND: “KEY” Warning lamp blinks when CONSULT-III screen is touched
 Off: Non-operation
INT LAMP This test is able to check interior room lamp operation
 On: Operate
 Off: Non-operation
LCD This test is able to check meter display information
 Engine start information displays when “BP N” on CONSULT-III screen is touched
 Engine start information displays when “BP I” on CONSULT-III screen is touched
 Key ID warning displays when “ID NG” on CONSULT-III screen is touched
 Steering lock information displays when “ROTAT” on CONSULT-III screen is touched
 P position warning displays when “SFT P” on CONSULT-III screen is touched
 INSRT: This item is displayed, but cannot be monitored
 BATT: This item is displayed, but cannot be monitored
 Take away through window warning displays when “NO KY” on CONSULT-III screen is
touched
 Take away warning displa y when “OUTKEY” on CONSUL T-III screen is touched
 OFF position warning display when “LK WN” on CONSULT-III screen is touched
FLASHER This test is able to check security hazard lamp operation
The hazard lamps are activated after “LH/RH/Off” on CONSULT-III screen is touched
P RANGE This test is able to check A/T shift selector power supply
 On: Operate
 Off: Non-operation
ENGINE SW ILLUMI This test is able to check push-button ignition switch illumination operation
Push-ignition switch illumination illuminates when “ON” on CONSULT-III screen is touched
Revision: 2010 May2011 QX56