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 or signal line, the combination meter sounds the incorporated buzzer according to the each pattern.
Lamp reminder buzzer

Ignition switch OFF signal
Lighting switch ON signal
Driver’s door switch ON signal

Door-ajar warning buzzer

Ignition switch ON signal
Any door switch or tailgate switch ON signal
Vehicles speed signal

Freeze warning buzzer

Ignition switch ON signal
Ambient temperature signal

Parking brake reminder buzzer

Ignition switch ON signal
Parking brake switch
Vehicles speed signal

Multi-information display switch operation buzzer

ON signal for multi-information display switch

Turn-signal lamp buzzer

Turn-signal lamp switch ON signal

ETACS-ECU function customise buzzer

Sounding request signal from the ETACS-ECU

A/C operation buzzer

Sounding request signal from the A/C-ECU

Ignition key reminder buzzer <Vehicles for GCC without KOS>

Ignition switch OFF signal
Key reminder switch OFF signal
Driver’s door switch ON signal

Speed alarm <Vehicles for GCC>

Ignition switch ON signal
Vehicles speed signal

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

Malfunction of combination meter
Damaged harness wires and connectors

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 diagnosis code chart.

Go to Step 3.

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

Check if diagnosis code is set to the engine-ECU, CVT-ECU, ABS-ECU, OSS-ECU, ETACS-ECU or A/C-ECU or heater control unit.

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

Set to the engine-ECU. : Troubleshoot the engine (Refer to GROUP 13A - Troubleshooting).

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

Set to the A/C-ECU/Heater control unit. : Troubleshoot the A/C-ECU/Heater control unit. Refer to GROUP 55B - Troubleshooting.

The diagnosis code is not set.

: Go to Step 4.

STEP 4. Check by M.U.T.-III "Special Function"

Using M.U.T.-III, select "Test" from the special function of the combination meter. Execute the following item to check the buzzer.

Item 3: Buzzer(AUTO)

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.