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.
Reverse (R) position reminder buzzer

Ignition switch ON signal
Selector lever R position signal

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

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

OSS-related malfunction warning buzzer (vehicles with KOS)

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

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

Engine switch reminder buzzer (vehicles with KOS)

Engine switch ON signal
Driver’s door switch ON signal

Keyless operation key reminder buzzer (vehicles with KOS)/ignition key reminder buzzer (vehicles without 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 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

FCM-LS collision warning buzzer/FCM-LS proximity warning buzzer/FCM-LS setting/FCM-LS cancel buzzer/Radar sensing misacceleration Mitigation System (RMS) (Forward) warning buzzer

Sounding request signal from the laser radar (FCM-ECU)

Speed alarm <Vehicles for GCC>

Ignition switch ON signal
Vehicles speed signal

A/C operation buzzer

Sounding request signal from the A/C-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

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, CVT-ECU, ABS-ECU <Vehicles without ASC>, ASC-ECU <Vehicles with ASC>, KOS&OSS-ECU, ETACS-ECU, laser radar (FCM-ECU), A/C-ECU or heater control unit.

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

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

).

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

.

Set in the ABS-ECU. <Vehicles without ASC> : Troubleshoot the ABS. Refer to GROUP 35B - Troubleshooting

.

Set in the ASC-ECU. <Vehicles with ASC> : Troubleshoot the ASC. 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.

Set in the laser radar (FCM-ECU). : Troubleshoot the FCM-LS. Refer to

.

Set in 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.