KEY REMINDER WARNING SYSTEM (w/o Entry and Start System) > Key Reminder Buzzer does not Sound

for Preparation Click here


DESCRIPTION

The key reminder warning buzzer sounds when the driver side door is opened while the ignition switch is in the LOCK or ACC positions. The key reminder warning buzzer is activated when the main body ECU sends a key switch signal and driver side courtesy light switch signal to the combination meter.

WIRING DIAGRAM


B214530E01


INSPECTION PROCEDURE

HINT:
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 How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.

1.CHECK DOOR COURTESY LIGHT SWITCH LH

  1. Open the driver door and check that the open door indicator on the combination meter comes on.

OK:
Open door indicator comes on.



NG
GO TO DOOR COURTESY LIGHT SWITCH CIRCUIT (Click here)
OK


2.READ VALUE USING INTELLIGENT TESTER (KEY UNLOCK WARNING SW)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body Electrical / Main Body / Data List/

  1. According to the display on the intelligent tester, read the Data List.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Key Unlock warning SW
    		Unlock warning switch signal / ON or OFF
    		ON: Key is in ignition key cylinder
    OFF: No key is in ignition key cylinder
    		-

    OK:
    When the unlock warning switch is operated, the display changes as shown in the table.



NG
Go to step 4
OK


3.CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)

  1. Remove the key from the key cylinder, turn the light control switch on the headlight dimmer switch assembly to the tail position, and open the driver door.

    OK:
    The light reminder warning buzzer sounds.

    HINT:
    The key reminder warning system sounds the buzzer built in to the combination meter for key reminder warnings. This buzzer is also used for the light reminder warning system. Therefore, check the operation of the combination meter buzzer by checking if the buzzer sounds to inform that the lights are still on.



NG
REPLACE COMBINATION METER ASSEMBLY (Click here)
OK

REPLACE MAIN BODY ECU (Click here)  

4.INSPECT UNLOCK WARNING SWITCH
B204777E02

  1. Remove the unlock warning switch (Click here).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2 (UN+) - 1 (UN-)
    		Lever released
    		10 kΩ or higher
    2 (UN+) - 1 (UN-)
    		Lever pushed in
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Unlock Warning Switch)



NG
REPLACE UNLOCK WARNING SWITCH (Click here)
OK


5.CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - MAIN BODY ECU)
B211276E01

  1. Disconnect the D18 unlock warning switch and D42 main body ECU connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D18-2 (UN+) - D42-17 (KSW)
    		Always
    		Below 1 Ω
    D18-1 (UN-) - Body ground
    		Below 1 Ω
    D18-2 (UN+) - Body ground
    		10 kΩ or higher

    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)



NG
REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE MAIN BODY ECU

  1. Temporarily replace the main body ECU with a new or normally functioning one (Click here).


NEXT


7.READ VALUE USING INTELLIGENT TESTER (KEY UNLOCK WARNING SW)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body Electrical / Main Body / Data List/

  1. According to the display on the intelligent tester, read the Data List.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Key Unlock warning SW
    		Unlock warning switch signal / ON or OFF
    		ON: Key is in ignition key cylinder
    OFF: No key is in ignition key cylinder
    		-

    OK:
    When the unlock warning switch is operated, the display changes as shown in the table.



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK
OK

END (MAIN BODY ECU IS DEFECTIVE)