Key Reminder Warning System Key Reminder Buzzer Does Not Sound

Vehicle Interior. Corolla. Zre142 Aze141
Door Lock. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)

READ VALUE USING TECHSTREAM (DOOR COURTESY SWITCH)

READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)

CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH - MAIN BODY ECU)

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

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

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 in LOCK or ACC. The key reminder warning buzzer is activated when the main body ECU sends a key switch signal and driver side courtesy switch signal to the combination meter.
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 the How to Proceed with Troubleshooting procedure. Then, conduct the following inspection procedure.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System.Key Reminder Warning System Key Reminder Buzzer Does Not Sound


INSPECTION PROCEDURE

1.CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)

  1. Turn the ignition switch to ON. Place luggage on the passenger seat to cause the passenger seat belt warning light to blink.

  1. When driving the vehicle at 15 km/h (9 mph) or higher, check that the seat belt warning buzzer sounds to inform that the passenger seat belt is not fastened.

    HINT:
    The key reminder warning system sounds the buzzer built into the combination meter as a key reminder warnings. 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 (COROLLA_ZRE142 RM0000024D7032X.html)
OK


2.READ VALUE USING TECHSTREAM (DOOR COURTESY SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Select D Door Courtesy SW in the Data List and read the Techstream display.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    D Door Courtesy SW
    		Driver side door courtesy switch signal/ON or OFF
    		ON: Driver side door is open
    OFF: Driver side door is closed
    		-
    OK:
    ON or OFF appears on the screen according to the driver side door condition.


NG
Go to step 4
OK


3.READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Select Key Unlock Warning SW in the Data List and read the Techstream display.

    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:
    ON or OFF appears on the screen according to whether the key is in the ignition key cylinder.


NG
Go to step 6
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

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


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System.Key Reminder Warning System Key Reminder Buzzer Does Not Sound

  1. Remove the driver side front door courtesy light switch (driver side) (COROLLA_ZRE142 RM000002VPS00OX.html).

  1. 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


NG
REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE) (COROLLA_ZRE142 RM000002VPS00OX.html)
OK


5.CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH - MAIN BODY ECU)


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System.Key Reminder Warning System Key Reminder Buzzer Does Not Sound

  1. Disconnect the 2A instrument panel junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L3-1 - 2A-21 (DCTY)
    		Always
    		Below 1 Ω
    L3-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

6.INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System.Key Reminder Warning System Key Reminder Buzzer Does Not Sound

  1. Remove the unlock warning switch assembly (COROLLA_ZRE142 RM0000026TU02HX.html).

  1. 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 (COROLLA_ZRE142 RM0000026TU02HX.html)
OK


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


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System.Key Reminder Warning System Key Reminder Buzzer Does Not Sound

  1. Disconnect the 2E instrument panel junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E5-1 - 2E-23 (KSW)
    		Always
    		Below 1 Ω
    E5-2 - Body ground
    		Always
    		Below 1 Ω
    E5-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)