Key Reminder Warning System (For Sedan) 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

READ VALUE USING TECHSTREAM

CHECK COMBINATION METER ASSEMBLY (WARNING BUZZER)

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

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

INSPECT FRONT DOOR COURTESY SWITCH (DRIVER SIDE)

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

KEY REMINDER WARNING SYSTEM (for Sedan) - 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 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 Sedan) Key Reminder Buzzer Does Not Sound


INSPECTION PROCEDURE

HINT:
Since the key reminder warning system has functions that use CAN communication, firstly 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

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. According to the display on tester, read on 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:
The display is as specified in the normal condition column.


NG
Go to step 4
OK


2.READ VALUE USING TECHSTREAM

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

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


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:
The display is as specified in the normal condition column.


NG
Go to step 6
OK


3.CHECK COMBINATION METER ASSEMBLY (WARNING BUZZER)

  1. Temporarily replace the combination meter assembly with a new or normally functioning one.

  1. Check the key reminder warning system function. (YARIS_NCP93 RM00000133203CX.html)

    OK:
    The key reminder warning system functions properly.


NG
REPLACE MAIN BODY ECU
OK

END (COMBINATION METER ASSEMBLY IS FAULTY)

4.INSPECT UNLOCK WARNING SWITCH ASSEMBLY


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

  1. Remove the unlock warning switch assembly.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Not pushed
    		10 kΩor higher
    1 - 2
    		Pushed
    		Below 1 Ω

  1. Reinstall the unlock warning switch assembly.



NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (YARIS_NCP93 RM000001GD401DX.html)
OK


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


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

  1. Disconnect the D19 unlock warning switch connector.

  1. Disconnect the 4D main body ECU connector.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D19-1 - 4D-7 (KSW)
    		Below 1 Ω
    D19-1 or 4D-7 (KSW) - Body ground
    		10 kΩor higher
    D19-2 - Body ground
    		Below 1 Ω

  1. Reconnect the unlock warning switch and the main body ECU connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU

6.INSPECT FRONT DOOR COURTESY SWITCH (DRIVER SIDE)


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

  1. Remove the front door courtesy switch (driver side).

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - Body ground
    		Not pushed (ON)
    		Below 1 Ω
    1 - Body ground
    		Pushed (OFF)
    		10 kΩor higher

  1. Reinstall the front door courtesy switch.



NG
REPLACE FRONT DOOR COURTESY SWITCH (DRIVER SIDE) (YARIS_NCP93 RM000001DKX01FX.html)
OK


7.CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY SWITCH - MAIN BODY ECU)
Yaris. Ncp93, 131.Door Lock.Power Door Lock Control System (For Sedan).Key Reminder Warning System (For Sedan) Key Reminder Buzzer Does Not Sound

  1. Disconnect the J2 front door courtesy switch connector.

  1. Disconnect the 4A main body ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    J2-1 - 4A-21 (DCTY)
    		Below 1 Ω
    J2-1 or 4A-21 (DCTY) - Body ground
    		10 kΩor higher

  1. Reconnect the front door courtesy switch and main body ECU connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU