Key Reminder Buzzer Does Not Sound

DOOR LOCK: KEY REMINDER WARNING SYSTEM: Key Reminder Buzzer does not Sound

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





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.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) According to the display on tester, read on the "Data List".
Main Body:






OK:
The display is as specified in the normal condition column.
NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) According to the display on tester, read on the "Data List".
Main Body:






OK:
The display is as specified in the normal condition column.
NG -- INSPECT FRONT DOOR COURTESY SWITCH (DRIVER SIDE)
OK -- Continue to next step.
3. CHECK COMBINATION METER ASSEMBLY (WARNING BUZZER)
(a) Temporarily replace the combination meter assembly with a new or normally functioning one.
(b) Check the key reminder warning system function. Key Reminder Warning System
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




(a) Remove the unlock warning switch assembly.
(b) Measure the resistance.
Standard resistance:





(c) Reinstall the unlock warning switch assembly.
NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.
5. CHECK WIRE HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - MAIN BODY ECU)




(a) Disconnect the D19 unlock warning switch connector.
(b) Disconnect the 4D main body ECU connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance:





(d) 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)




(a) Remove the front door courtesy switch (driver side).
(b) Measure the resistance of the switch.
Standard resistance:





(c) Reinstall the front door courtesy switch.
NG -- REPLACE FRONT DOOR COURTESY SWITCH (DRIVER SIDE)
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY SWITCH - MAIN BODY ECU)
(a) Disconnect the J2 front door courtesy switch connector.




(b) Disconnect the 4A main body ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:





(d) Reconnect the front door courtesy switch and main body ECU connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU