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.
ASLF overspeed buzzer (vehicles with cruse control system)

Ignition switch ON signal
Vehicles speed signal

Electric steering wheel lock malfunction warning buzzer (vehicles with KOS)

Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU uses the following input signals to send a sounding request signal)

Ignition switch signal
LIN bus line (local) for electrical steering lock
Actuator driving permission monitoring signal

OSS-related malfunction warning buzzer (vehicles with KOS)

Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU uses the following input signals to send a sounding request signal)

Ignition switch signal
When the following conditions are met, and 1 second or more has elapsed (a: +B1 is detected to be ON and +B2 is detected to be OFF. b: When +B1 is OFF and +B2 is ON, KOS&OSS-ECU detects that the IOD fuse is mounted.).

Engine switch reminder buzzer (vehicles with KOS)

Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU uses the following input signals to send a sounding request signal)

Engine switch ON signal
Driver’s door switch ON signal

Keyless operation key reminder buzzer (vehicles with KOS)

Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU uses the following input signals to send a sounding request signal)

Ignition switch OFF signal
Immobilizer antenna output signal
Driver’s door switch ON signal

Key reminder buzzer (vehicles without KOS)

Driver’s door switch ON signal
Sounding request signal from the ETACS-ECU (The ETAC-ECU uses the following input signals to send a sounding request signal)

Ignition switch OFF signal
Key reminder switch ON signal

Lamp reminder buzzer

Ignition switch OFF signal
Sounding request signal from the ETACS-ECU (The ETAC-ECU uses the following input signals to send a sounding request signal)

Lighting switch ON signal
Driver’s door switch ON signal

Door-ajar warning buzzer

Ignition switch ON signal
Any door 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
Engine speed

Turn-signal lamp buzzer

Turn-signal lamp switch ON signal

A/T shift cancel buzzer/Paddle shift cancel prohibition buzzer

Sounding request signal from the A/T-ECU

ETACS-ECU function customise buzzer

Sounding request signal from the ETACS-ECU

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
Malfunction of ECUs

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 in 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 in the engine-ECU, A/T-ECU, ABS-ECU, ASTC-ECU, KOS&OSS-ECU and ETACS-ECU.

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

Set in the engine-ECU. : Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart

<4G6>, GROUP 13B -Troubleshooting

<4D5> or GROUP 13C -Troubleshooting

<4N1>).

Set in the A/T-ECU. : Troubleshoot the A/T. Refer to GROUP 23A - Diagnosis code chart

.

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

.

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

.

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

.

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

.

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 (Refer to

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 (Refer to