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Home >> Nissan-Datsun >> 2010 >> Altima L4-2.5L (QR25DE) Hybrid >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Description and Operation >> Intelligent Key System/Engine Start Function >> System Description

System Description





INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION


System Description


INPUT/OUTPUT SIGNAL CHART






SYSTEM DESCRIPTION
- 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 communications 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 communications between the Intelligent Key and the vehicle.

NOTE:
The driver should carry the Intelligent Key at all times.
- Intelligent Key has 2 IDs [for Intelligent Key and for NVIS (NATS)]. It can perform the door lock/unlock operation and the push-button ignition switch operation when the registered Intelligent Key is carried.
- When the Intelligent Key battery is discharged, it can be used as emergency back-up by inserting the Intelligent Key to the key slot. At that time, perform the NVIS (NATS) ID verification. If it is used when the Intelligent Key is carried, perform the Intelligent Key ID verification.
- If the ID is successfully verified, and when push-button ignition switch is pressed, starting the hybrid system will be possible.
- 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.
- Intelligent Key can be registered with up to 4 keys on request from the owner.

NOTE:
- System Description for any functions other than hybrid system start function of Intelligent Key system.

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM
- In the Intelligent Key system of model L32, the transponder [the chip for NVIS (NATS) ID verification]
is integrated into the Intelligent Key. (For vehicles without Intelligent Key, it is integrated into the mechanical key.) Therefore, the mechanical key cannot perform the ID verification, and thus it cannot start the hybrid system. Instead, the NVIS (NATS) ID verification can be performed by inserting the Intelligent Key into the key slot, and then it can start the hybrid system.

OPERATION WHEN INTELLIGENT KEY IS CARRIED
1. When the push-button ignition switch is pressed and brake pedal depressed, 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 BCM receives the Intelligent Key ID signal and verifies it with the registered ID.
4. BCM turns ACC relay ON and transmits the ignition power supply ON signal to IPDM E/R.
5. IPDM E/R turns the ignition relay ON and starts the ignition power supply.
6. BCM confirms that the shift position is P.
7. BCM transmits the hybrid system start request signal via hardwire to Hybrid Vehicle Control ECU. If BCM judges that the hybrid system start condition is satisfied.

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

OPERATION RANGE
Hybrid system can be started when Intelligent Key is inside the vehicle. However, sometimes hybrid system 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 NVIS (NATS) ID verification between the integrated transponder and BCM by inserting the Intelligent Key into the key slot, and then the hybrid system can be started.
For details relating to starting the hybrid system using key slot, System Description.

BATTERY SAVER SYSTEM
When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply to prevent battery discharge.
- The ignition switch is in the ACC position
- All doors are closed
- CVT selector lever is in the P position
- No Intelligent Key malfunctions (Intelligent Key warning indicator is not ON)

Reset Condition of Battery Saver System
In order to prevent the battery from discharging, the battery saver system will cut off the power supply when all doors are closed, the selector lever is on P position and the ignition switch is left on ACC position for 1 hour. If any of the following conditions are met the battery saver system is released and the steering will change automatically to lock position from OFF position.
- Opening any door
- Operating with request switch on door lock
- Operating with Intelligent Key on door lock
Press push-button ignition switch will change to ACC position from OFF position.

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE
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 or when it is inserted to the key slot, it is equivalent to the operations below.
- When starting the engine, the BCM monitors under the hybrid system start conditions,
- Brake pedal operating condition
- CVT selector lever position
- Vehicle speed
- Engine status
- Unless each condition is fulfilled, the hybrid system will not respond regardless of how many times the hybrid system switch is pressed. At that time, illumination repeats the position in the order of LOCK to ACC to ON to OFF.




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