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.
Seat belt reminder function

Ignition switch ON signal
Driver’s seat belt switch signal
Passenger’s seat belt switch signal
Rear seat belt switch signal
Vehicles speed signal

FCM collision warning buzzer/FCM approaching warning buzzer/ACC approaching warning buzzer/ACC automatic canceling buzzer/ACC vehicle stop/ACC vehicle-traveling-ahead missing indication buzzer/ACC_FCM set/FCM set/ACC_FCM deactivation/cruise control set indication buzzer/ASLF overspeed buzzer

Sounding request signal from the ACC/FCM-ECU, engine-ECU

LDW warning buzzer

Sounding request signal from the LDW-ECU

AS&G buzzer

Sounding request signal from the AS&G-ECU

Security alarm buzzer

Ignition switch ON signal
Sounding request signal from the ETACS-ECU

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

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

OSS-related malfunction warning buzzer (vehicles with OSS)

Ignition switch signal
When the following conditions are met, and 1 second or more has elapsed.

+B1 is detected to be ON and +B2 is detected to be OFF.
When +B1 is OFF and +B2 is ON, OSS-ECU detects that the IOD fuse is mounted.

Engine switch reminder buzzer (vehicles with OSS)

Engine switch ON signal
Driver’s door switch ON signal

Keyless operation key reminder buzzer (vehicles with KOS)

Ignition switch OFF signal
IG knob push switch ON signal
Driver’s door switch ON signal

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 interrupt display buzzer

Display condition signal of information display from each warning (When there is a fixed buzzer sounding pattern for each warning, that pattern has the priority.)

Meter information switch or rheostat illumination switch <High contrast meter> operation buzzer

ON signal for multi-information display switch

Turn-signal lamp buzzer

Turn-signal lamp switch ON signal

A/T shift cancel buzzer/Paddle shift cancel prohibition buzzer, ETACS-ECU function customise buzzer, A/C operation buzzer, audio operation buzzer

Sounding request signal from the CVT-ECU, A/C-ECU, radio and CD player, Multivision display

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 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 engine-ECU, CVT-ECU, A/T-ECU, ABS-ECU, ASC-ECU, ACC/FCM-ECU, AS&G-ECU, KOS-ECU, OSS-ECU, ETACS-ECU, heater controller assembly (A/C-ECU) and LDW-ECU.

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

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

<4B1>, GROUP 13C -Troubleshooting

<4J1>, GROUP 13D -Troubleshooting

<4N1>).

Set to the CVT-ECU. : Troubleshoot the CVT. Refer to GROUP 23A - Diagnosis code chart

.

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

.

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

.

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

.

Set to the ACC/FCM-ECU. : Troubleshoot the ACC. Refer to GROUP 17 - Troubleshooting

.

Set to the AS&G-ECU. : Troubleshoot the ACC. (Refer to GROUP 17 - Diagnosis Code Chart

<M/T> or

<CVT>).

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

.

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

.

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

.

Set to the heater controller assembly (A/C-ECU). : Troubleshoot the A/C. Refer to GROUP 55 - Troubleshooting

.

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

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.