KEY REMINDER WARNING SYSTEM Key Reminder Buzzer does not Sound

DTC Code DTC Name
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

  1. for LHD

    B281179E11

  2. for RHD

    B319944E02

CAUTION / NOTICE / HINT

Note:

The key reminder warning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the key reminder warning system after confirming that the communication systems are functioning properly.

Click hereClick here

PROCEDURE

  1. CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)

    1. Turn the ignition switch to ON. Place luggage on the front passenger seat to cause the front 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 front passenger seat belt is not fastened.

      Tip:

      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.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COMBINATION METER ASSEMBLY

    for Sedan:Click hereClick here

    for Hatchback, Wagon:Click here

    OK

  2. READ VALUE USING GTS (FR Door Courtesy SW, FL 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.

      Body Electrical > Main Body > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      FR Door Courtesy SW

      Front door courtesy light switch RH signal

      ON or OFF

      ON: Front door RH open

      OFF: Front door RH closed

      *1

      FL Door Courtesy SW

      Front door courtesy light switch LH signal

      ON or OFF

      ON: Front door RH open

      OFF: Front door RH closed

      *2

      • *1: for RHD

      • *2: for LHD

      Body Electrical > Main Body > Data List

      Tester Display

      FR Door Courtesy SW

      FL Door Courtesy SW

      OK

      The GTS indicates ON or OFF according to the driver door condition shown in the table.

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  3. 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.

      Body Electrical > Main Body > Data List

      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

      -

      Body Electrical > Main Body > Data List

      Tester Display

      Key Unlock Warning SW

      OK

      The GTS indicates ON or OFF according to whether the key is in the ignition key cylinder.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    NG

  4. INSPECT UNLOCK WARNING SWITCH ASSEMBLY

    1. Remove the unlock warning switch assembly.

      Click here

    2. Inspect the unlock warning switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY

    Click here

    OK

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

    1. Disconnect the E22 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

      E5-1 - E22-17 (KSW)

      Always

      Below 1 Ω

      E5-2 - Body ground

      Always

      Below 1 Ω

      E5-1 - Body ground

      Always

      10 kΩ or higher

      E22-17 (KSW) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for Driver Door)

    1. Remove the front door courtesy light switch assembly (for driver door).

      for Sedan:Click here

      for Hatchback, Wagon:Click here

    2. Inspect the front door courtesy light switch assembly (for driver door).

      for Sedan:Click here

      for Hatchback, Wagon:Click here

    Result

    Result

    Proceed to

    OK (for LHD)

    A

    OK (for RHD)

    B

    NG

    C
    B

    CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for Driver Door) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))Click here

    C

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for Driver Door)

    Click here

    A

  7. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for Driver Door) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 3E 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

      L1-1 - 3E-25

      Always

      Below 1 Ω

      L1-1 - Body ground

      Always

      10 kΩ or higher

      3E-25 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. Remove the instrument panel junction block assembly.

      for LHD:Click here

      for RHD:Click here

      B281983C13

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      -

      -

    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

      3E-25 - MB-2 (FLCY)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click here

    for RHD:Click here

  9. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for Driver Door) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    1. Disconnect the E22 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

      L26-1 - E22-19 (FRCY)

      Always

      Below 1 Ω

      L26-1 - Body ground

      Always

      10 kΩ or higher

      E22-19 (FRCY) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR