INSPECTION PROCEDURE 3: When The Speech Switch Is Pressed, The Voice Guide Is Output, But The Voice Recognition Is Not Performed: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set

1. STEP 1. Retest the system. 

   Close all the windows to suppress external noise as much as possible. Then check whether the voice recognition operates normally when you utter a word as close to the microphone unit as possible.

   Q: Is the check result normal? 

   • YES:  Diagnosis complete.
   • NO:  Go to Step  2.
2. STEP 2. Check the diagnostic test mode. 

   Check if the microphone check result "MIC OK" is displayed on the diagnostic test mode of hands free-ECU. (Refer to STANDARD FLOW OF DIAGNOSTIC .)

   Q: Is the check result normal? 

   • YES:  Go to Step  4.
   • NO:  Go to Step  3.
3. STEP 3. Check of short to power supply, short to ground, and open circuit in MIC+, MIC- line between hands free-ECU connector and microphone unit connector. 

   Q: Is the check result normal? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
   • NO:  Repair the connector(s) or wiring harness.
4. STEP 4. Replace the microphone unit temporarily, and check the trouble symptom. 

   Q: Is the check result normal? 

   • YES:  Replace the microphone unit.
   • NO:  Go to Step  5.
5. STEP 5. Replace the hands free-ECU temporarily, and check the trouble symptom. 

   Q: Is the check result normal? 

   • YES:  Replace the hands free-ECU.
   • NO:  Go to Step  1.