Inspection Procedure 14: Outer buzzer does not sound.
caution
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
OPERATION
The outer buzzer sounds under the following conditions.
When the door is locked or unlocked with the keyless or keyless operation function
Door lock does not operate.
The keyless operation key is brought out of the vehicle.
Also, with a customisation function, "Buzzer answerback" may be set to "Not Sound Buzzer."
PROBABLE CAUSES
Malfunction of the outer buzzer
Malfunction of the KOS-ECU
Malfunction of the connector
Function setting error or no setting with a customisation
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check if any diagnosis code is stored in the KOS-ECU.
Q.
Is the diagnosis code stored?
Refer to diagnosis code chart .
Go to Step 2.
STEP 2. Check the customisation
With a customisation function, check if "Buzzer answerback" is set to other than "Not Sound Buzzer."
Q.
Is it set to other than "Not Sound Buzzer"?
Go to Step 3.
With a customisation function, "Buzzer answerback" is set to other than "Not Sound Buzzer" (Refer to ).
STEP 3. M.U.T.-III actuator test
Check that the outer buzzer sounds (Refer to ).
Q.
Is the check result normal?
Go to Step 5.
Replace the outer buzzer. Go to Step 4.
STEP 4. Check of short to power supply, short to earth, and open circuit in DRVB, PWRB line between the KOS-ECU connector and the outer buzzer connector.
note
Before the wiring harness check, check the intermediate connector, and repair if necessary.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness.
STEP 5. Check of the troubles
Check that the outer buzzer sounds when the outer buzzer sounding conditions are met.
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction ).
Replace KOS-ECU and register the ID codes (Refer to ).