Detection Of Locking Request

When the ignition key is turned to position 0, the ignition switch lock solenoid actuator remains active (unlocked) for 16 minutes. This function allows immediate restarting of the vehicle as long as the key is not removed from the ignition switch. When the key is removed, the immobilization ECU senses the removal and transmits a NO VALID KEY IN LOCK message on the K-bus. The steering lock ECU checks that the ignition switch position II or III outputs and the rotation sensor are not active and initiates the steering locking process. This check ensures that the steering is not locked when the vehicle may be being driven.

If the K-bus is inoperative, locking of the steering column is prevented by the steering lock ECU. This is indicated to the driver when attempting to start the vehicle through a delayed operation of the ignition switch lock solenoid actuator preventing the key from being turned initially. The solenoid actuator is operated on a delay which will initially prevent the key from being turned. The solenoid actuator will unlock and allow the key to turn on the second attempt. A defect in the K-bus is detected if no response from the immobilization ECU is received after a 2.4 seconds period after the REQUEST IMMOBILIZATION ECU STATUS is sent.