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 entry 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&OSS-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 set in the KOS&OSS-ECU.

Q. Is the diagnosis code set?

Refer to diagnosis code chart

Go to Step 2.

STEP 2. M.U.T.-III other system diagnosis code

Check if any diagnosis code is set in the ETACS-ECU.

Q. Is the diagnosis code set?

Perform troubleshooting for the ETACS-ECU (Refer to GROUP 54A - ETACS - Troubleshooting

Go to Step 3.

STEP 3. 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 4.

With a customisation function, Buzzer answerback is set to other than Not Sound Buzzer (Refer to

STEP 4. M.U.T.-III actuator test

Check that the outer buzzer sounds (Refer to

Q. Is the check result normal?

Go to Step 8.

Go to Step 5.

STEP 5. Resistance measurement at outer buzzer connector (earth line)

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between the outer buzzer connector (earth line) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 7.

Go to Step 6.

STEP 6. Check of open circuit in earth line between the outer buzzer connector and the body earth

Q. Is the check result normal?

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

Repair the connector(s) or wiring harness.

STEP 7. Check of short to power supply, short to earth or open circuit in DRVB line between the outer buzzer connector and the KOS&OSS-ECU connector terminal.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Check of the troubles

Replace outer buzzer. After the replacement, 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 Cope with Intermittent Malfunction

Replace KOS&OSS-ECU and register the ID codes (Refer to