Security Control System: Overview Infiniti FX50 II

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ECM RE-COMMUNICATING FUNCTION: Description

Performing following procedure can automatically perform re-communication of ECM and BCM, but only when the ECM has been replaced with a new one (*1).

*1: New one means a virgin ECM which has never been energized on-board.

(In this step, initialization procedure by CONSULT-III is not necessary)

Note. When registering new Key IDs or replacing the ECM that is not brand new, refer to CONSULT-III Operation Instructions NATS-IVIS/NVIS. If multiple keys are attached to the key holder, separate them before beginning work. Distinguish keys with unregistered key IDs from those with registered IDs.

System Description

1. The engine start function of Intelligent Key system is a system that makes it possible to start and stop the engine without removing the key. It verifies the electronic ID using two-way communication when pressing the push-button ignition switch while carrying the Intelligent Key, which operates based on the results of electronic ID verification for Intelligent Key using two-way communication between the Intelligent Key and the vehicle. NOTE: The driver should carry the Intelligent Key at all times.
2. Intelligent Key has 2 IDs [for Intelligent Key and for IVIS (NATS)]. It can perform the door lock/unlock operation and the push-button ignition switch operation when the registered Intelligent Key is carried.
3. When the Intelligent Key battery is discharged, it can be used as emergency back-up by inserting the Intelligent Key in the key slot. At that time, perform the IVIS (NATS) ID verification. If it is used when the Intelligent Key is carried, perform the Intelligent Key ID verification.
4. If the ID is successfully verified, and when push-button ignition switch is pressed, steering lock will be released and initiating the engine will be possible.
5. If the door lock/unlock operation is performed when the Intelligent Key battery is discharged, all doors lock/unlock can be performed by operating the driver door key cylinder using the mechanical key set in the Intelligent Key.
6. Up to 4 Intelligent Keys can be registered (Including the standard Intelligent Key) on request from the owner.

Note. Refer to INTELLIGENT KEY SYSTEM : SYSTEM DESCRIPTION for any functions other than engine start function of Intelligent Key system.

OPERATION WHEN INTELLIGENT KEY IS CARRIED

1. When the push-button ignition switch is pressed, the BCM signals 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 via the remote keyless entry receiver.
3. The Intelligent Key receives the Intelligent Key ID signal and verifies it with the registered ID.
4. BCM transmits the steering lock 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 to the steering lock unit.
6. Release of the steering lock.
7. BCM transmits the power supply stop signal to IPDM E/R when it confirms 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 confirms that the shift position is P or N.
12. BCM transmits the starter request signal via CAN communication 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. Battery power is supplied through the starter relay and the starter control relay to operate the starter motor and to start the cranking. CAUTION: If a malfunction is detected in the Intelligent Key system, the "KEY" warning lamp in the combination meter illuminates. At that time, the engine cannot be started.
15. When BCM receives feedback signal from ECM acknowledging the engine has been initiated, the BCM transmits a stop signal to IPDM E/R and stops the cranking by turning OFF the starter motor relay. If the engine initiating has failed, the cranking will stop automatically within 5 seconds.

*: For the engine start condition, refer to PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE .

OPERATION RANGE

Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine might not start when Intelligent Key is on instrument panel or in glove box.

OPERATION WHEN KEY SLOT IS USED

When the Intelligent Key battery is discharged, it performs the IVIS (NATS) ID verification between the integrated transponder and BCM by inserting the Intelligent Key into the key slot, and then the engine can be started.

For details relating to starting the engine using key slot, refer to SYSTEM DESCRIPTION .

STEERING LOCK OPERATION

Steering is locked by steering lock unit when ignition switch is in the OFF position, selector lever is in the P position and any of the following conditions are met.

1. Opening door
2. Closing door
3. Door is locked with request switch
4. Door is locked with Intelligent Key

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE

The power supply position changing operation can be performed with the following operations.

Operation Enable Condition

1. When an Intelligent Key is within the detection area of inside key antenna and when it is inserted to the key slot, it is equivalent to the operations below.
2. When starting the engine, the BCM monitors the following engine start conditions, Brake pedal operating condition Selector lever position Vehicle speed
3. Unless each start condition is fulfilled, the engine will not respond regardless of how many times the engine switch is pressed. At that time, illumination repeats the position in the order of LOCK-->ACC-->ON-->OFF.

Operation Condition

OPERATION CONDITION TABLE

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Component Description

COMPONENT DESCRIPTION

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1. The IVIS (NATS) is an anti-theft system by registering an Intelligent Key ID in to the vehicle and prevents the engine being started by an unregistered Intelligent Key. It has a higher protection against auto thefts that duplicate mechanical key.
2. It performs the ID verification when starting the engine in the same way as the Intelligent Key system. But, it performs the IVIS (NATS) ID verification when inserting the Intelligent Key and performs the Intelligent Key ID verification when carrying the Intelligent Key.
3. The mechanical key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is discharged, the IVIS (NATS) ID verification memorized to the transponder integrated with Intelligent Key is performed by inserting the Intelligent Key into the key slot. If the verification results are OK, the engine start operation can be performed by the push-button ignition switch operation.
4. Locate the security indicator lamp and apply the anti-theft system equipment sticker, forewarn that the IVIS (NATS) is on-board with the model.
5. The security indicator lamp always blinks when the power supply position is in LOCK and ACC.
6. Up to 4 Intelligent keys can be registered (Including the standard ignition key) on request from the owner.
7. The specified registration is required when replacing ECM, BCM or Intelligent Key. The registration procedure for IVIS (NATS) and registration procedure for Intelligent Key when installing the BCM, refer to CONSULT-III Operation Instructions NATS-IVIS/NVIS.
8. Possible symptom of IVIS (NATS) malfunction is "Engine can not start". The engine can be started with the Intelligent Key system and IVIS (NATS). Identify the possible causes according to "Work Flow", refer to «WORK FLOW»(ref-368904-S11650479162010081300000) .
9. If ECM other than Genuine NISSAN is installed, the engine cannot be started. For ECM replacement procedure, refer to «ECM RE-COMMUNICATING FUNCTION: SPECIAL REPAIR REQUIREMENT»(ref-368904-S00897302302010081300000) .

COMPONENT DESCRIPTION

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CANCELING THE ALARM OPERATION OF THE VEHICLE SECURITY SYSTEM

When unlocking all doors with the door request switch, Intelligent Key or door key cylinder switch the alarm operation is canceled.

ACTIVATING THE ALARM OPERATION OF THE VEHICLE SECURITY SYSTEM

Check that the system is in the armed phase. (The security indicator lamp blinks every 2.4 seconds.

When the following operation 1 or 2 is performed, the system sounds the horns and blinks the headlamps for about 50 seconds.

1. Back door or any door is opened during the armed phase.
2. Disconnecting and connecting the battery connector before canceling the armed phase.

PANIC ALARM OPERATION

Intelligent Key system may or may not operate vehicle security system (horn and headlamps) as required. When the Intelligent Key system is triggered, ground is supplied intermittently to both headlamp relay and horn relay.

When headlamp relay and horn relay are energized, then power is supplied to headlamps (high beam and low beam) and horns (high and low).

The headlamps flash and the horn sounds intermittently.

The alarm automatically turns off after 50 seconds or when BCM receives any signal from Intelligent Key, door request switch or door key cylinder.

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COMPONENT DESCRIPTION

BCM: Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Refer to CAN COMMUNICATION SIGNAL TABLE .

IPDM E/R: Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Refer to CAN COMMUNICATION SIGNAL TABLE .

Description

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.

1. Unregistered Intelligent Key is used.
2. BCM or ECM is malfunctioning.

BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON.

BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON.

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the release of steering lock or start of engine when an unregistered ID of Intelligent Key is used.

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the release of steering lock or start of engine when an unregistered ID of Intelligent Key is used.

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the release of steering lock or start of engine when an unregistered ID of Intelligent Key is used.

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the release of steering lock or start of engine when an unregistered ID of Intelligent Key is used.

BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON.

BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON.

BCM performs the ID verification with the steering lock unit and releases the steering lock if both BCM and steering lock unit ID are same. BCM starts the communication with the steering lock unit when Intelligent Key is carried into the passenger compartment and the push-button ignition switch is pressed.

BCM performs the ID verification with the steering lock unit to release the steering. BCM starts the communication with the steering lock unit when Intelligent Key is carried into the passenger compartment and the push-button ignition switch is pressed.

BCM detects the stop lamp status and confirms the stop lamp switch ON/OFF status. BCM confirms the engine start condition according to the stop lamp switch ON/OFF status.

The switch that changes the power supply position. BCM maintains the power supply position status. BCM changes the power supply position with the operation of the push-button ignition switch.

BCM receives the 2 vehicle speed signals via CAN communication. 1 signal is transmitted by the "unified meter and A/C amp." another signal is transmitted by "ABS actuator and electric unit (control unit)". BCM compares both signals to detect the vehicle speed.

Starter control relay, integrated in IPDM E/R, permits the starter relay operation when in the N or P position and the steering is locked or unlocked. It is installed in parallel with the starter relay.

BCM confirms the shift position with the following 4 signals.

1. Selector lever
2. P/N position switch
3. P position signal from IPDM E/R (CAN)
4. P position signal from TCM (CAN)

BCM confirms the shift position with the following 4 signals.

1. Selector lever
2. P/N position switch
3. P position signal from IPDM E/R (CAN)
4. P position signal from TCM (CAN)

BCM confirms the shift position with the following 4 signals.

1. Selector lever
2. P/N position switch
3. P position signal from IPDM E/R (CAN)
4. P position signal from TCM (CAN)

BCM confirms the shift position with the following 4 signals.

1. Selector lever
2. P/N position switch
3. P position signal from IPDM E/R (CAN)
4. P position signal from TCM (CAN)

BCM confirms the shift position with the following 4 signals.

1. Selector lever
2. P/N position switch
3. P position signal from IPDM E/R (CAN)
4. P position signal from TCM (CAN)

The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication.

IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM.

BCM requests to IPDM E/R to supply power to steering lock unit. After receiving the power, the steering lock unit transmits an ON signal to BCM.

Located in IPDM E/R, The starter relay runs the starter motor. The starter relay is turned ON by the BCM when the ignition switch is in the START position. IPDM E/R transmits the starter relay ON signal to BCM via CAN communication.

There are 2 switches in the steering lock unit (steering lock/unlock switch 1 and 2). BCM compares those 2 switches conditions to judge the present steering status.

The steering lock unit performs the check by itself according to the steering status.

The steering lock unit performs the check by itself according to the steering status.

The steering lock unit performs the check by itself according to the steering lock status (before lock, after lock and unlock).

BCM receives the engine status signal from ECM via CAN communication.

BCM receives the engine status signal from ECM via CAN communication.

There are 2 switches in the steering lock unit (steering lock/unlock switch 1 and 2). BCM compares those 2 switches conditions to judge the present steering status.

When the registered Intelligent Key is carried, the door lock/unlock operation and the push-button ignition switch operation become possible.

There are 2 switches in the steering unit. IPDM E/R compares those 2 switch conditions to judge the present steering status and transmit the result to BCM via CAN communication.

Located in IPDM E/R, it runs the starter motor. The starter relay is turned ON by the BCM when the ignition switch is in the START position. IPDM E/R transmits the starter relay ON signal to BCM via CAN communication.

BCM requests IPDM E/R to supply power to steering lock unit. After receiving the power, the steering lock unit transmits an ON signal to BCM.

BCM transmits the change in the power supply position with the push-button ignition switch to IPDM E/R via CAN communication. IPDM E/R transmits the power supply position status via CAN communication to BCM.

There are two types of vehicles.

1. HEV
2. Conventional

The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication.

IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM.

The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication.

IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM.

There are 2 switches in the steering unit. IPDM E/R compares those 2 switch conditions to judge the present steering status and transmit the result to BCM via CAN communication.

Starter control relay, integrated in IPDM E/R, permits the starter relay operation when in the N or P position and the steering is locked or unlocked. It is installed in parallel with the starter relay.

Starter control relay, integrated in IPDM E/R, permits the starter relay operation when in the N or P position and the steering is locked or unlocked. It is installed in parallel with the starter relay.

Located in IPDM E/R, it runs the starter motor. The starter relay is turned ON by the BCM when the ignition switch is in the START position. IPDM E/R transmits the starter relay ON signal to BCM via CAN communication.

Located in IPDM E/R, it runs the starter motor. The starter relay is turned ON by the BCM when the ignition switch is in the START position. IPDM E/R transmits the starter relay ON signal to BCM via CAN communication.

IPDM E/R confirms the shift position with the following signals.

1. Park/neutral position (PNP) switch
2. Shift position signal from BCM (CAN)

IPDM E/R confirms the shift position with the following signals.

1. Park/neutral position (PNP) switch
2. Shift position signal from BCM (CAN)

Hood switch is built into hood lock (RH) and connected to IPDM E/R which detects the open/close condition of hood.

Headlamp lighting when vehicle security system is alarm phase.

1. Security indicator lamp is located on combination meter.
2. IVIS (Infiniti Vehicle Immobilizer System-NATS) and vehicle security system conditions are indicated by blink or illumination of security indicator lamp.

Performs operation method guide and warning together with buzzer.

HIGH FLASHER OPERATION

BCM detects the turn signal lamp circuit status by the current value.

BCM increases the turn signal lamp blinking speed if the bulb or harness open is detected with the turn signal lamp operating.

Note. The blinking speed is normal while activating the hazard warning lamp.

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

Note. The engine start function, door lock function, power distribution system and IVIS in the Intelligent Key system are closely related to each other regarding control.

If door switch is malfunctioning, BCM cannot lock the steering. If BCM does not detect DTC, steering lock unit is normal.

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

INTELLIGENT KEY: Description

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

DOOR REQUEST SWITCH: Description

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

DOOR KEY CYLINDER: Description

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

Check that vehicle is under the condition shown in "Conditions of vehicle" before starting diagnosis, and check each symptom.

OPERATION PROCEDURE

1. Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. At this time, the steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released with both battery cables disconnected and the steering wheel can be turned.
4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn the push-button ignition switch from ACC position to ON position, then to LOCK position. The steering wheel will lock when the push-button ignition switch is turned to LOCK position.
6. Perform self-diagnosis check of all control units using CONSULT-III.

See also:
• CAN COMMUNICATION SIGNAL TABLE
• BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT