KEY REMINDER WARNING SYSTEM Key Reminder Buzzer does not Sound

DESCRIPTION

The key reminder warning buzzer sounds when the driver side door is opened while the ignition switch is off or ACC. The key reminder warning buzzer is activated when the main body ECU (instrument panel junction block assembly) sends a unlock warning switch signal and driver side courtesy light switch signal to the combination meter assembly.

Tech Tips

Since the key reminder warning system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting CAN communication in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

WIRING DIAGRAM

A00597DE05

CAUTION / NOTICE / HINT

Note

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (FRONT DOOR COURTESY LIGHT SWITCH (FOR DRIVER SIDE))


    1. Check the Data List for proper functioning of the front door courtesy light switch (for driver side).

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Door Courtesy SW Driver side door courtesy light switch signal / ON or OFF

      ON: Driver side door open

      OFF: Driver side door closed

      		 -
      OK
      On the intelligent tester screen, ON and OFF is displayed for each item according to the table below.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH)


    1. Check the Data List for proper functioning of the unlock warning switch.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Unlock Warning SW Unlock warning switch signal / ON or OFF

      ON: Key in ignition key cylinder

      OFF: No key in ignition key cylinder

      		 -
      OK
      On the intelligent tester screen, ON and OFF is displayed for each item according to the table below.

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

  3. INSPECT UNLOCK WARNING SWITCH ASSEMBLY

    A0056HKE10
    *1 Not pushed
    *2 Pushed
    *3 Component without harness connected: (Unlock Warning Switch)

    1. Remove the unlock warning switch assembly Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Not pushed 10 kΩ or higher
      Pushed Below 1 Ω

    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - MAIN BODY ECU AND BODY GROUND)

    A0056B5E02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Unlock Warning Switch Assembly)
    *2

    Front view of wire harness connector

    (to Main Body ECU [Instrument Panel Junction Block Assembly])

    1. Disconnect the D99 unlock warning switch assembly connector.

    2. Disconnect the DE main body ECU (instrument panel junction block assembly) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D99-1 - DE-23 (KSW) Always Below 1 Ω
      D99-2 - Body ground Always Below 1 Ω
      DE-23 (KSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK COMBINATION METER ASSEMBLY (OPERATION)


    1. Temporarily replace the combination meter assembly with a new or normally functioning one Click here.

    2. Check the key reminder warning system.

      OK
      The key reminder warning system functions properly.

    OK

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)