Electronic Key System

System Description
- Every electronic key (including transponder) has its own key ID No. However, only an electronic key with the key ID registered in the NATS IMMU and ECM can turn ON while inserted in the ignition key cylinder, allowing the engine to start.
- An ignition key (electronic key) with straight contour is adopted to prevent the electronic key from vehicle theft by abuse of duplicated key etc.
- If the batteries for the vehicle and handheld transmitter are discharged, using the emergency key integrated into the electronic key, the driver/passenger doors and trunk lid can be operated for open/close, and the steering wheel lock can be unlocked.

NOTE: The engine cannot be started with an emergency key.

- If any of ECM, NATS IMMU, steering lock control unit (integrated in the key cylinder) or ignition key (electronic key) has been replaced, or if the trouble diagnosis requires additional registration, mandatory reregistration procedure and registration of the electronic key ID code (if an ignition-key is added) are required.

NOTE:
All the keys kept by the vehicle owner re-registration of the key ID (electronic key) shall be necessary.
- If the vehicle owner requires, electronic key ID codes can be registered for up to four keys (including the electronic key). In this case, the key IDs shall also be registered.

NOTE:
- The key ID code and remote controller ID code for the key equipped on the vehicle have already been registered at factory.
- When conducting registration of key ID at repair, part replacement, and electronic key addition, even the registered ignition (standard) key shall be registered again. Therefore, collect all the keys from the vehicle owner.




SECURITY INDICATOR

OUTLINE OF ELECTRONIC KEY OPERATION
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 (R) NATS antenna amp. (R) 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.