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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 640 (Security Control System) >> Function Diagnosis >> Intelligent Key System/Engine Start Function >> System Description >> Operation When Intelligent Key Is Carried
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Operation When Intelligent Key Is Carried

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. When the push-button ignition switch is pressed and brake pedal is depressed, the BCM signals the inside key antenna and transmits the request signal to the Intelligent Key.
  2. The Intelligent Key sends 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 transmits the steering lock unlock signal to steering lock unit and IPDM E/R if the verification results are OK.
  5. IPDM E/R turns the steering lock relay ON and supplies power to the steering lock unit.
  6. Release of the steering lock.
  7. BCM transmits the power supply stop signal to IPDM E/R when it confirms that the steering lock is in the unlock condition.
  8. IPDM E/R turns the steering lock relay OFF and stops power supply to the steering lock unit.
  9. BCM turns ACC relay ON and transmits the ignition power supply ON signal to IPDM E/R.
  10. IPDM E/R turns the ignition relay ON and starts the ignition power supply.
  11. BCM confirms that the shift position is P or N.
  12. BCM transmits the starter request signal via CAN communication to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM judges that the engine start condition is satisfied.
  13. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
  14. Battery power is supplied through the starter relay and the starter control relay to operate the starter motor and to start the cranking.
    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.
  15. When BCM received feedback signal from ECM acknowledging the engine has been initiated, the BCM transmits a stop signal to IPDM E/R and stops the cranking by turning OFF the starter motor relay. (If the engine initiating has failed, the cranking will stop automatically within 5 seconds.)
    CAUTION: When the Intelligent Key is carried outside of the vehicle (inside key antenna detection area) with the power supply in ACC or ON position, even if the engine start condition* is satisfied, the engine cannot be started.

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

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