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 (network gateway ECU) sends a buzzer sound request signal to the combination meter assembly.

WIRING DIAGRAM

A004KT6E03

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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. READ VALUE USING GTS (D DOOR COURTESY SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.

      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 opened

      OFF: Driver side door closed

      		 -
      OK
      ON or OFF appears on the screen according to the driver door condition.

    NG

    GO TO LIGHTING SYSTEM (DOOR COURTESY LIGHT SWITCH CIRCUIT) Click here

    OK

  2. READ VALUE USING GTS (KEY UNLOCK WARNING SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.

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

      OFF: Ignition key is not inserted

      ON: Ignition key is inserted

      		 -
      OK
      When the un-lock warning switch assembly 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 (NETWORK GATEWAY ECU) Click here

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  4. INSPECT UN-LOCK WARNING SWITCH ASSEMBLY


    1. Remove the un-lock warning switch assembly Click here.

    2. Inspect the un-lock warning switch assembly Click here.


    NG

    REPLACE UN-LOCK WARNING SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the D53 un-lock warning switch assembly connector.

    2. Disconnect the D5 main body ECU (network gateway ECU) connector.

    3. A004INPE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Un-lock Warning Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D53-1 (UN+) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      D53-2 (UN-) - D5-22 (KSW) Always Below 1 Ω
      D53-2 (UN-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR