INSPECTION PROCEDURE 19: 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.

PROBABLE CAUSES

Malfunction of the antenna and outer buzzer assembly
Malfunction of the KOS-ECU
Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

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

Check whether a KOS-related diagnosis code is set.

Q. Is the diagnosis code set?

Refer to

Go to Step 2.

STEP 2. M.U.T.-III actuator test

Check that the outer buzzer sounds (Refer to

Q. Is the check result normal?

Go to Step 6.

Go to Step 3.

STEP 3. Connector check: F-16 outer buzzer connector, C-104 KOS-ECU connector

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Check the wiring harness between the F-16 outer buzzer connector terminal Nos. 1, 2 and the C-104 KOS-ECU connector terminal Nos. 35, 37.

Check the power supply and earth lines for open circuit.

note

Before the wiring harness inspection, inspect the intermediate connectors C-36 and F-22, and repair them if necessary.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

STEP 5. Outer buzzer check

Remove the outer buzzer, and check that it sounds normally. Refer to

Q. Is the check result normal?

Go to Step 6.

Replace the outer buzzer.

STEP 6. 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