Inspection Procedure 15: 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.


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code


Check if any diagnosis code is set to the KOS-ECU.

Q. Is the diagnosis code set?

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 ).