Inspection Procedure 4: Tone alarm does not sound normally: Diagnosis

1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ."
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal? 

1. YES:  Go to Step 2.
2. NO:  Repair the CAN bus line (Refer to PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES ).

Check if DTC is stored in the combination meter.

Q: Is the DTC stored? 

1. YES:  Troubleshoot the combination meter (Refer to TROUBLE JUDGEMENT  ).
2. NO:  Go to Step 3.

Check if diagnostic trouble code is stored in the CVT, ETACS-ECU, WCM, KOS-ECU, audio and A/C-ECU.

Q: Is the DTC stored in the any of the above? 

1. YES < Stored in the CVT. >:  Troubleshoot the CVT (Refer to DIAGNOSIS ).
2. YES < Stored in the ETACS. >:  Troubleshoot the ETACS (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
3. YES < Stored in the WCM. >:  Troubleshoot the WCM (Refer to DIAGNOSIS ).
4. YES < Stored in the KOS. >:  Troubleshoot the KOS (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
5. YES < Stored in the A/C. >:  Troubleshoot the A/C (Refer to MANUAL A/C DIAGNOSIS or AUTOMATIC A/C DIAGNOSIS ).
6. NO:  Go to Step 4.

Using scan tool MB991958, select "Test" from the special function of the combination meter. Execute the following item to check the tone alarm.

• Item 3: Buzzer (AUTO)

Q: Is the check result normal? 

1. YES:  Go to Step 5.
2. NO:  Replace the combination meter.

Check that the tone alarm sounds normally.

Q: Is the check result normal? 

1. YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO:  Replace the combination meter.