KEY REMINDER WARNING SYSTEM Key Reminder Buzzer does not Sound

DESCRIPTION

The key reminder warning buzzer sounds when the driver door is opened while the ignition switch is off or ACC. The key reminder warning buzzer is activated when the main body ECU (multiplex network body ECU) sends an unlock warning switch signal and driver door courtesy light switch signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

B000I03E02

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. Check the seat belt warning buzzer operation Click here.

      Tech Tips

      The key reminder warning system sounds the buzzer built into the combination meter assembly 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 INTELLIGENT TESTER (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY)


    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 / Main Body / Data List.

    5. Select FL Door Courtesy in the Data List and read the intelligent tester display.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FL Door Courtesy Front door courtesy light switch LH signal/ON or OFF

      ON: Front door LH closed

      OFF: Front door LH open

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

    NG

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

    OK

  3. READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH ASSEMBLY)


    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 / Main Body / Data List.

    5. Select Key Unlock Warning SW in the Data List and read the intelligent tester display.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      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 (MULTIPLEX NETWORK BODY ECU) Click here

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


    1. Remove the front door courtesy light switch assembly (for driver door) (for TMMK Made) Click here.

    2. B000LZEE11
      Text in Illustration
      *1 Switch Body
      *a

      Component without harness connected

      (Front Door Courtesy Light Switch Assembly (for driver door ))

      Remove the front door courtesy light switch assembly (for driver door) (for TMC, TMMR Made) Click here.

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

      Standard Resistance
      Tester Connection Switch 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
      Result
      Result Proceed to
      OK A
      NG (for TMMK Made) B
      NG (for TMC, TMMR Made) C

    B

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

    C

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

    A

  5. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3C instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N7-1 - 3C-15 Always Below 1 Ω
      N7-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

      B000M7IE12

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-15 - MB-2 (FLCY) Always Below 1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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

  7. INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. B000NQAE05
      Text in Illustration
      *a

      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 Switch 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

  8. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I33-1 - I13-17 (KSW) Always Below 1 Ω
      I33-2 - Body ground Always Below 1 Ω
      I33-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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