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 position. 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.
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 function in accordance with the "HOW TO PROCEED WITH TROUBLESHOOTING" procedures. Then, conduct the following inspection procedure.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (FRONT DOOR COURTESY LIGHT SWITCH LH)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch 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:
ON (driver door is open) appears on the screen.
NG -- GO TO LIGHTING SYSTEM (DOOR COURTESY LIGHT SWITCH CIRCUIT)
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch 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:
ON (Key is in ignition key cylinder) appears on the screen.
NG -- INSPECT UNLOCK WARNING SWITCH
OK -- Continue to next step.
3. CHECK COMBINATION METER (TAILLIGHT REMINDER WARNING BUZZER)
(a) Remove the key from the key cylinder, turn the light control switch to the tail position and open the driver side door.
OK:
The taillight reminder warning buzzer sounds.
HINT: The key reminder warning buzzer uses the same buzzer as the taillight reminder warning buzzer.

NG -- REPLACE COMBINATION METER
OK -- REPLACE MAIN BODY ECU
4. INSPECT UNLOCK WARNING SWITCH




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





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




(a) Disconnect the F21 unlock warning switch connector.
(b) Disconnect the 4D main body ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the unlock warning switch connector.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU