Inspection Procedure 3: 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.
FCM collision warning buzzer/FCM approaching warning buzzer <Vehicles with FCM>

Sounding request signal from the FCM-ECU

A/T shift cancel buzzer <A/T>/High oil temp warning buzzer <Vehicles with paddle shift>

Sounding request signal from the A/T-ECU

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) <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

Lamp reminder buzzer

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

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 ON signal
Vehicles speed signal

Frozen road warning buzzer

Ignition switch ON signal
Ambient temperature signal

Parking brake reminder buzzer

Ignition switch ON signal
Parking brake switch ON signal
Vehicles speed signal
Engine speed

Multi information display switch operation buzzer <Mono-colour liquid crystal display type>

ON signal for multi information display switch

Rheostat illumination switch/multi information display switch/multi information display back switch operation buzzer <Colour liquid crystal display type>

ON signal for multi information display switch

Multi information display interrupt display buzzer <Colour liquid crystal display type>

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.)

ETACS-ECU function customise buzzer

Sounding request signal from the ETACS-ECU

Turn-signal lamp buzzer

Turn-signal lamp switch ON signal

Security alarm buzzer

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

Rest reminder buzzer

When the time to take a rest which was set on the multi information display is reached.

ASTC pre high temperature warning buzzer/ASTC high temperature warning buzzer <Vehicles with ASTC>

Sounding request signal from the ASTC-ECU

Electric parking brake emergency brake buzzer <A/T>

Sounding request signal from the electric parking brake ECU

Rear differential lock system <4WD>/FCM <Vehicles with FCM>/Ultrasonic misacceleration mitigation system <Vehicles with ultrasonic misacceleration mitigation system>/Hill descent control <Vehicles with ASTC>/Off road mode cancel buzzer <Vehicles with ASTC>

Sounding request signal from the transfer-ECU, FCM-ECU, ASTC-ECU, clearance warning control unit

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 ECUs 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 <A/T>, ABS-ECU <Vehicles without ASTC>, ASTC-ECU <Vehicles with ASTC>, FCM-ECU <Vehicles with FCM>, Electric parking brake ECU <A/T>, KOS&OSS-ECU <Vehicles with KOS>, Clearance warning control unit <Vehicles with corner sensor system>, ETACS-ECU and A/C-ECU <Vehicles with automatic A/C>.

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

Set in the engine-ECU. : Troubleshoot the engine (Refer to GROUP 13B -Troubleshooting <6B1>, GROUP 13C -Troubleshooting <4N1> or GROUP 13E - Troubleshooting

<4D5>).

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

Set in the Transfer-ECU. : Troubleshoot the ES4/SS4 (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 FCM-ECU. : Troubleshoot the FCM (Refer to GROUP 35C - Troubleshooting).

Set in the Electric parking brake ECU. : Troubleshoot the Electric parking brake (Refer to GROUP 36 - Troubleshooting).

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

Set in the Clearance warning control unit. : Troubleshoot the Clearance warning control unit.

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

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