KEY REMINDER WARNING SYSTEM(w/o Power Switch) 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 sends a key switch signal and driver side courtesy light switch signal to the combination meter.

WIRING DIAGRAM

A004ECBE02

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. READ VALUE USING GTS (FRONT DOOR COURTESY LIGHT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy SW*1 Front RH door courtesy light switch signal / OFF or ON

      OFF: Front RH door opened

      ON: Front RH door closed

      		 -
      FL Door Courtesy SW*2 Front LH door courtesy light switch signal / OFF or ON

      OFF: Front RH door opened

      ON: Front RH door closed

      		 -

      • *1: for RHD

      • *2: for LHD

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

    NG

    GO TO LIGHTING SYSTEM (DOOR COURTESY 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 (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.

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

      OFF: Ignition key is not inserted

      ON: Ignition key is inserted

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

    NG

    INSPECT UNLOCK 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 Click here

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  4. INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. Inspect the unlock warning switch assembly Click here.


    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the F57 main body ECU connector.

    2. Disconnect the F13 unlock warning switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F57-17 (KSW) - F13-1 Always Below 1 Ω
      F13-2 - Body ground Always Below 1 Ω
      F57-17 (KSW) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR