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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS) BL-199 C D E F G H J K L M A B BL NOTE: System Composition EIS0012A 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 1. By inserting the ignition key (electronic key: built-in transponder) into the key cylinder, the key detection 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 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 7. NATS IMMU compares the stored key ID and received one, and only if the matching result is OK, it trans- 8. When the key rotation permission signal is input, the steering lock control unit activates the electronic key 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 → OFF signal by itself to inhibit the electronic key from turning. NOTE: PIIA0376E |