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 ACC or 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.


WIRING DIAGRAM

A01X7HOE04

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

PROCEDURE


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


    1. Check the Data List for proper functioning of the front door courtesy light switch Click here.

      Main Body
      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 opened

      OFF: Driver side door closed

      		 -

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

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


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

      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 tester screen, item changes between ON and OFF according to above chart.

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    NG

  3. INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. A01X6ABE02

      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 (UN+) - 2 (UN-) Not pushed 10 kΩ or higher
      Pushed Below 1 Ω

    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the E94 unlock warning switch connector.

    2. Disconnect the E4 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E94-1 (UN+) - E4-5 (KSW) Always Below 1 Ω
      E94-2 (UN-) - Body ground Always Below 1 Ω
      E94-1 (UN+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  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.

    OK

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)