Key Reminder Warning System (For Hatchback) Key Reminder Buzzer Does Not Sound

Vehicle Interior. Yaris. Ncp93, 131
Door Lock. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (FL DOOR COURTESY)

READ VALUE USING TECHSTREAM (KEY UNLOCK WARNING SW)

CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

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

KEY REMINDER WARNING SYSTEM (for Hatchback) - 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 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


Yaris. Ncp93, 131.Door Lock.Power Door Lock Control System (For Sedan).Key Reminder Warning System (For Hatchback) Key Reminder Buzzer Does Not Sound


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.READ VALUE USING TECHSTREAM (FL DOOR COURTESY)

  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. According to the display on the Techstream, read the Data List.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FL Door Courtesy
    		Front LH door courtesy light switch signal / ON or OFF
    		ON: Front LH door closed
    OFF: Front LH door opened
    		-
    OK:
    When the unlock warning switch is operated, the display changes as shown in the table.


NG
GO TO LIGHTING SYSTEM (DOOR COURTESY LIGHT SWITCH CIRCUIT) (YARIS_NCP93 RM000003304010X.html)
OK


2.READ VALUE USING TECHSTREAM (KEY UNLOCK WARNING SW)

  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. According to the display on the Techstream, read the Data List.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Key Unlock Warning SW
    		Unlock warning switch signal / OFF or ON
    		OFF: Ignition key is not inserted
    ON: Ignition key is inserted
    		-
    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 (YARIS_NCP93 RM0000035EJ00BX.html)
OK

REPLACE MAIN BODY ECU (YARIS_NCP93 RM000003TOE00CX.html)

4.INSPECT UNLOCK WARNING SWITCH ASSEMBLY

  1. Inspect the unlock warning switch assembly (YARIS_NCP93 RM000001GD201RX.html).



NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (YARIS_NCP93 RM000001GD401JX.html)
OK


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

  1. Disconnect the D111 unlock warning switch and D143 main body ECU connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D111-1 - D143-17 (KSW)
    		Always
    		Below 1 Ω
    D111-2 - Body ground
    		Always
    		Below 1 Ω
    D111-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (YARIS_NCP93 RM000003TOE00CX.html)