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 LOCK or ACC. The key reminder warning buzzer is activated when the main body ECU (driver side junction block assembly) sends an unlock warning switch signal and driver side door courtesy light switch signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE: 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 How To Proceed With Troubleshooting. Then, conduct the following inspection procedure.

PROCEDURE

1. CHECK COMBINATION METER ASSEMBLY (BUZZER OPERATION)
(a) Turn the ignition switch to ON. Place luggage on the passenger seat to cause the passenger seat belt warning light to blink.
(b) When driving the vehicle at 20 km/h (12 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 warning. 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
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (DRIVER SIDE DOOR COURTESY LIGHT SWITCH)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Select D Door Courtesy SW in the Data List and read the Techstream display.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))





OK:
ON or OFF appears on the screen according to the driver side door condition.

NG -- INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Select Key Unlock Warning SW in the Data List and read the Techstream display.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))





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

NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY
OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
4. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)




(a) Remove the front door courtesy light switch assembly (for driver side) Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)
OK -- Continue to next step.

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




(a) Disconnect the D50 driver side junction block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
6. INSPECT UNLOCK WARNING SWITCH ASSEMBLY




(a) Remove the unlock warning switch assembly Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.

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




(a) Disconnect the D51 driver side junction block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)