KEY REMINDER WARNING SYSTEM(w/o Entry and Start 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 in the LOCK or ACC positions. The key reminder warning buzzer is activated when the main body ECU (multiplex network body ECU) sends a key switch signal and driver side courtesy light switch signal to the combination meter.

WIRING DIAGRAM

A005IVAE02
A005L4LE02

CAUTION / NOTICE / HINT

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 the CAN communication functions in accordance with How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.

PROCEDURE


  1. CHECK FRONT DOOR COURTESY LIGHT SWITCH


    1. Open the driver door and check that the open door indicator on the combination meter comes on.

      OK
      Open door indicator comes on.

    NG

    GO TO DOOR COURTESY LIGHT SWITCH CIRCUIT Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (KEY UNLOCK WARNING SW)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body Electrical / Main Body / Data List/

    5. According to the display on the intelligent tester, read the Data List.

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

      ON: Key is in ignition key cylinder

      OFF: No key is in ignition key cylinder

      		 -
      OK
      When the unlock warning switch is operated, the display changes as shown in the table.

    NG

    INSPECT UN-LOCK WARNING SWITCH ASSEMBLY Click here

    OK

  3. CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)


    1. Remove the key from the key cylinder, turn the light control switch on the headlight dimmer switch assembly to the tail position, and open the driver door.

      OK
      The light reminder warning buzzer sounds.

      Tech Tips

      The key reminder warning system sounds the buzzer built in to the combination meter for key reminder warnings. This buzzer is also used for the light reminder warning system. Therefore, check the operation of the combination meter buzzer by checking if the buzzer sounds to inform that the lights are still on.


    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  4. INSPECT UN-LOCK WARNING SWITCH ASSEMBLY


    1. Remove the unlock warning switch Click here.

    2. Inspect the unlock warning switch Click here.


    NG

    REPLACE UN-LOCK WARNING SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the F15 unlock warning switch and F76 main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F15-1 - F76-17 (KSW) Always Below 1 Ω
      F15-2 - Body ground Below 1 Ω
      F15-1 - Body ground 10 kΩ or higher

    NG

    REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Temporarily replace the main body ECU (multiplex network body ECU) with a new or normally functioning one Click here.


    NEXT

  7. READ VALUE USING INTELLIGENT TESTER (KEY UNLOCK WARNING SW)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body Electrical / Main Body / Data List/

    5. According to the display on the intelligent tester, read the Data List.

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

      ON: Key is in ignition key cylinder

      OFF: No key is in ignition key cylinder

      		 -
      OK
      When the unlock warning switch is operated, the display changes as shown in the table.

    OK

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) IS DEFECTIVE)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY