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
Sounding request signal from the ACC/FCM-ECU, engine-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
Sounding request signal from the CVT-ECU, A/C-ECU, radio and CD player
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 stored in the combination meter.
Q.
Is the diagnosis code stored?
Refer to .
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is stored in the engine-ECU, CVT-ECU, A/T-ECU, ABS-ECU, ASC-ECU, ACC/FCM-ECU, KOS-ECU, OSS-ECU, ETACS-ECU and heater controller assembly (A/C-ECU).
Q.
Is the diagnosis code stored in the any of the above?
Set to the engine-ECU. : Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart <2000, 2400>, GROUP 13B - Troubleshooting <3000>).
Set to the CVT-ECU. : Troubleshoot the CVT. Refer to GROUP 23A - Diagnosis code chart .
Set to the A/T-ECU. : Troubleshoot the A/T. 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 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 .
The diagnosis code is not stored. : 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 ).