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Home › Lexus › 2005 › SC 430 › Repair and Diagnosis › Body & Frame › Door Locks › Key Reminder Warning System - Diagnostics › System Description

System Description

  1. KEY REMINDER WARNING SYSTEM DESCRIPTION 

    When the driver door is opened with the ignition switch on ACC or OFF, the system sounds a buzzer to warn the driver that the key has not been removed from the ignition key cylinder.

  2. FUNCTION OF COMPONENT 
    FUNCTION OF COMPONENT DESCRIPTION

    Components Function
    Front Door Courtesy Lamp Switch Detects front door status (open or closed) and outputs signal to multiplex network door ECU front LH (driver door ECU)
    Unlock Warning Switch Detects if key is inserted into ignition key cylinder and outputs signal to transponder key ECU
    Combination Meter Assy Receives buzzer request signal from transponder key ECU (after transponder key ECU receives ignition switch signal and front door courtesy lamp switch signal), then combination meter actuates inner circuit to sound built-in multi-buzzer intermittently
    Multiplex Network Door ECU Front LH (Driver Door ECU) Sends front door courtesy lamp switch signals to theft warning ECU
    Transponder Key ECU Assy Sends unlock warning switch signals to theft warning ECU
    Theft Warning ECU Assy Receives signal from multiplex network door ECU front LH and transponder key ECU, and sends signal to combination meter to sound or not sound buzzer
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