Inspection Procedure 7: Buzzers do not sound normally.



caution Before replacing the combination meter, be sure to check that the power supply circuit, earth circuit, and communication circuit are normal.


COMMENTS ON TROUBLE SYMPTOM


When the following signals are received via the CAN communication, the combination meter sounds the incorporated buzzer according to the each pattern.
Seat belt reminder function
Keyless operation key reminder buzzer <vehicles with KOS>
Lamp reminder buzzer function
Door-ajar warning buzzer function
Freeze warning buzzer function
Parking brake reminder buzzer function
Multi information display interrupt display buzzer
Meter information switch operation buzzer
Turn-signal lamp buzzer function
ETACS-ECU function customise buzzer, A/C operation buzzer, audio operation buzzer
If the buzzer does not sound normally, the connector(s) and wiring harness in the CAN bus lines, or the ETACS-ECU or the combination meter may have a problem.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

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


Check if diagnosis code is set to the combination meter.

Q. Is the diagnosis code set?

Refer to .

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code


Check if diagnosis code is set to the ABS-ECU, ASC-ECU, KOS-ECU, audio, ETACS-ECU or A/C-ECU.

Q. Is the diagnosis code set to the any of the above?

Set to the ABS-ECU. : Troubleshoot the ABS. Refer to GROUP 35B - Troubleshooting .

Set to the ASC-ECU. : Troubleshoot the ASC. Refer to GROUP 35C - Troubleshooting .

Set to the KOS-ECU. : Troubleshoot the KOS. Refer to GROUP 42B - Troubleshooting .

Set to the audio. : Troubleshoot the audio. Refer to .

Set to the ETACS-ECU. : Troubleshoot the ETACS-ECU. Refer to .

Set to the A/C-ECU. : Troubleshoot the A/C. Refer to GROUP 55 - Troubleshooting .

The diagnosis code is not set. : Go to Step 4.

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


Perform the actuator test, and check that the buzzers sound normally.

Q. Is the check result normal?

Go to Step 5.

Replace the combination meter.

STEP 5. Retest the system


Check that the buzzers sound normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the combination meter.