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 side door is opened while the ignition switch is ACC, or while the ignition switch is off and the key is in the ignition key cylinder. The key reminder warning buzzer is activated when the main body ECU sends an unlock warning switch signal and front door courtesy light switch LH*1 or RH*2 signal to the combination meter.

  • *1: for LHD

  • *2: for RHD

Tip:

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 CAN communication in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

WIRING DIAGRAM

E178219E04

CAUTION / NOTICE / HINT

Note:

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure (Click here).

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (FRONT DOOR COURTESY LIGHT SWITCH)

    • *1: for LHD

    • *2: for RHD

    1. Check the Data List for proper functioning of the front door courtesy light switch LH*1 or RH*2.

      Table 1. Main Body

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      D Door Courtesy SW

      Front door courtesy light switch LH*1 or RH*2 signal / ON or OFF

      ON: Driver side door open

      OFF: Driver side door closed

      -

      OK

      ON (driver door is open) appears on the screen.

    GO TO LIGHTING SYSTEM

    (Click here)

  2. READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH)

    1. Check the Data List for proper functioning of the unlock warning switch.

      Table 2. Main Body

      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 (key is in ignition key cylinder) appears on the screen.

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  3. INSPECT UNLOCK WARNING SWITCH ASSEMBLY

    E146811E05

    1. Remove the unlock warning switch (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

      Not pushed

      10 kΩ or higher

      Pushed

      Below 1 Ω

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY

    (Click here)

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

    E355536E01

    1. Disconnect the H7 switch connector.

    2. Disconnect the DE ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H7-1 - DE-23 (KSW)

      Always

      Below 1 Ω

      H7-2 - Body ground

      Always

      Below 1 Ω

      DE-23 (KSW) - Body ground

      Always

      10 kΩ or higher
      Table 3. Text in Illustration

      *1

      Front view of wire harness connector

      (to Unlock Warning Switch)

      *2

      Front view of wire harness connector

      (to Main Body ECU)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK COMBINATION METER ASSEMBLY (OPERATION)

    1. Temporarily replace the combination meter assembly with a new or normally functioning one (Click here).

    2. Check the key reminder warning system (Click here).

      OK

      The key reminder warning system functions properly.

    END (COMBINATION METER IS DEFECTIVE)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)