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 in LOCK or ACC. The key reminder warning buzzer is activated when the main body ECU (driver side junction block assembly) sends an unlock warning switch signal and driver side door courtesy light switch signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

A01EL3GE02

INSPECTION PROCEDURE

Note

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 the How to Proceed with Troubleshooting procedure Click here. Then, conduct the following inspection procedure.

PROCEDURE


  1. CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)


    1. Turn the ignition switch to ON. Place luggage on the passenger seat to cause the passenger seat belt warning light to blink.

    2. When driving the vehicle at 20 km/h (12 mph) or higher, check that the seat belt warning buzzer sounds to inform that the passenger seat belt is not fastened.

      Tech Tips

      The key reminder warning system sounds the buzzer built into the combination meter as a key reminder warning. This buzzer is also used for the seat belt warning system. Therefore, check the operation of the combination meter buzzer by checking if the buzzer sounds to inform that the seat belt is not fastened.

      OK
      Combination meter buzzer sounds.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS (DRIVER SIDE DOOR COURTESY LIGHT SWITCH)


    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. Select D Door Courtesy SW in the Data List and read the GTS display.

      Main Body (Main Body ECU (Driver Side Junction Block Assembly))
      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 or OFF appears on the screen according to the driver side door condition.

    NG

    INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE) Click here

    OK

  3. READ VALUE USING GTS (UNLOCK WARNING SWITCH)


    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. Select Key Unlock Warning SW in the Data List and read the GTS display.

      Main Body (Main Body ECU (Driver Side Junction Block Assembly))
      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 or OFF appears on the screen according to whether the key is in the ignition key cylinder.

    NG

    INSPECT UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

  4. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)


    1. A01EJAVE01
      Text in Illustration
      *1

      Component without harness connected

      (Front Door Courtesy Light Switch Assembly (for Driver Side))
      *2 Switch Body

      Remove the front door courtesy light switch assembly (for driver side) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - Switch body Courtesy switch pushed (Door closed) 10 kΩ or higher
      1 - Switch body Courtesy switch free (Door open) Below 1 Ω

    NG

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (DRIVER SIDE DOOR COURTESY LIGHT SWITCH - MAIN BODY ECU)


    1. A01EMRQE11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Door Courtesy Light Switch Assembly (for Driver Side))
      *2

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the D50 driver side junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L8-1 - D50-24 (DCTY) Always Below 1 Ω
      L8-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

  6. INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. A01EKGKE01
      Text in Illustration
      *1

      Component without harness connected

      (Unlock Warning Switch Assembly)

      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 Condition Specified Condition
      1 - 2 Switch free (Key removed) 10 kΩ or higher
      1 - 2 Switch pushed (Key set) Below 1 Ω

    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

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


    1. A01EL0VE07
      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 (Driver Side Junction Block Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D24-1 - D51-5 (KSW) Always Below 1 Ω
      D24-2 - Body ground Always Below 1 Ω
      D24-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here