Operation CHARM: Car repair manuals for everyone.
Home >> Infiniti >> 2003 >> Q45 V8-4.5L (VK45DE) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Description and Operation >> Infiniti Vehicle Immobilizer System (IVIS ) - NATS

Infiniti Vehicle Immobilizer System (IVIS ) - NATS

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

NOTE: If customer reports a No start condition, request ALL ELECTRONIC KEY to be brought to the Dealer is case of a NATS malfunction.

System Description
IVIS (Infinity Vehicle Immobilizer System - NATS) has the following immobilizer functions:
- Since only IVIS (NATS) electronic keys, whose ID nos. have been registered into the ECM and NATS IMMU of IVIS (NATS), allow the engine to run, operation of a stolen vehicle without a IVIS (NATS) registered electronic key is pre-vented by IVIS (NATS).
That is to say, IVIS (NATS) will immobilize the engine if someone tries to start it without the registered electronic key of IVIS (NATS).
- All of the originally supplied electronic key IDs (except for card key and emergency key) have been IVIS (NATS) registered. If requested by the vehicle owner, a maximum of four key IDs can be registered into the IVIS (NATS) components.
- The security indicator blinks when the ignition switch is in OFF or ACC position. Therefore, IVIS (NATS) warns outsiders that the vehicle is equipped with the anti-theft system.
- When IVIS (NATS) detects any malfunctions, the security indicator lamp lights up while electronic key is in the ON position.
- IVIS (NATS) trouble diagnosis, system initialization and additional registration of other IVIS (NATS) electronic key IDs must be carried out using CONSULT-II hardware and CONSULT-II IVIS (NATS) software. When IVIS (NATS) initialization has been completed, the ID of the inserted electronic key is automatically IVIS (NATS) registered. Then, if necessary, additional registration of other IVIS (NATS) electronic key IDs can be carried out.
Regarding the procedures of IVIS (NATS) initialization and IVIS (NATS) electronic key ID registration, refer to CONSULT-II operation manual, IVIS/NVIS.

NOTE: When servicing a malfunction of the IVIS (NATS) indicated by lighting up of Security Indicator Lamp or registering another IVIS (NATS) electronic key ID no., it is necessary to re-register original key identification. Therefore, be sure to receive ALL ELECTRONIC KEYS from vehicle owner.




System Composition
The immobilizer function of the IVIS (NATS) consists of the following:
- IVIS (NATS) electronic key
- IVIS (NATS) antenna amp. Located in the ignition key cylinder
- Steering lock control unit.
- IVIS (NATS) immobilizer control unit (NATS IMMU)
- Engine control module (ECM)
- Security indicator

OUTLINE OF IVIS (NATS) FUNCTION

Operation 1 (Insert the key into the ignition key cylinder.)
1. By inserting the ignition key (electronic key: built-in transponder) into the key cylinder, the key detection switch is turned to ON.
2. The power is supplied from the NATS IMMU -> NATS antenna amp. -> antenna coil.
3. The current through the antenna coil induces a magnetic field.
4. The coil in the transponder induces electromotive force by mutual induction, which is charged in the capacitor.
5. The transponder uses the charged energy to transmit the built-in key ID signal.
6. The sent key ID signal is received by the antenna coil and transmitted via the NATS antenna amp. to NATS IMMU.
7. NATS IMMU compares the stored key ID and received one, and only if the matching result is OK, it transmits the key rotation permission signal to the steering lock control unit (integrated in the key cylinder).
8. When the key rotation permission signal is input, the steering lock control unit activates the electronic key solenoid valve in the key cylinder to allow the electronic key to turn.
9. Turn ignition switch ON.
10. Only if the key ID matching result is OK, the ECM allows the engine to start.

Operation 2 (Withdraw the key from the ignition key cylinder.)
1. Return the electronic key to the LOCK position of the steering system lock.
2. When the key is removed, the electronic key solenoid valve in the key cylinder returns to inhibit the key from turning. In this case, the steering lock control unit processes the key switch ON -> OFF signal by itself to inhibit the electronic key from turning.

NOTE: If the A/T selector lever is not in P position, the electronic key does not return to LOCK position.

ECM Re-communicating Function
Performing following procedure can automatically perform re-communication of ECM and NATS IMMU, 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-II is not necessary)

NOTE:
- When registering new Key IDs or replacing the ECM other than brand new, refer to CONSULT-II Operation Manual NATS-IVIS/NVIS.
- If multiple keys are attached to the key holder, separate them before work.
- Distinguish keys with unregistered key ID from those with registered ID.

1. Install ECM.
2. Using a registered key (*2), turn ignition switch to ON.
*2: To perform this step, use the key (except for card plate key) that has been used before performing ECM replacement.
3. Maintain ignition switch in ON position for at least 5 seconds.
4. Turn ignition switch to OFF.
5. Start engine.
If engine can be started, procedure is completed.
If engine cannot be started, refer to CONSULT-II Operation Manual NATS-IVIS/NVIS and initialize control unit.
pro multis · About Operation CHARM