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)
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 ).