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
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
LDW warning buzzer
AS&G buzzer
Security alarm buzzer
Electric steering wheel lock malfunction warning buzzer (vehicles with OSS)
OSS-related malfunction warning buzzer (vehicles with OSS)
  1. +B1 is detected to be ON and +B2 is detected to be OFF.
  2. When +B1 is OFF and +B2 is ON, OSS-ECU detects that the IOD fuse is mounted.
Engine switch reminder buzzer (vehicles with OSS)
Keyless operation key reminder buzzer (vehicles with KOS)
Lamp reminder buzzer
Door-ajar warning buzzer
Freeze warning buzzer
Parking brake reminder buzzer
Multi information display interrupt display buzzer
Meter information switch or rheostat illumination switch <High contrast meter> operation buzzer
Turn-signal lamp buzzer
A/T shift cancel buzzer/Paddle shift cancel prohibition buzzer, ETACS-ECU function customise buzzer, A/C operation buzzer, audio operation buzzer
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




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.

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.