Inspection Procedure
3: When the SPEECH switch is pressed, the voice guide is output, but the voice recognition is
not performed.
caution
Before replacing the hands
free-ECU, ensure that the power supply circuit, the earth circuit and the communication circuit
are normal.
COMMENTS ON TROUBLE SYMPTOM
When the SPEECH switch is pushed, if the voice guide is sent but voice recognition is
not executed, the microphone unit, hands free-ECU or the communication between the microphone
unit and hands free-ECU may have a problem. It may also be possible that the voice recognition
is interfered by external noise.
PROBABLE CAUSES
The hands free-ECU may be defective.
The microphone unit may be defective.
Malfunction of e-Call control unit <Vehicles with ERA-GLONASS SYSTEM>
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
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?
Diagnosis complete.
NO <Vehicles without ERA-GLONASS SYSTEM> : Go to Step 3.
NO <Vehicles with ERA-GLONASS SYSTEM> : Go to Step 2.
STEP 2. M.U.T.-III other system diagnosis code
Check whether the e-Call control unit diagnosis codes are set or not.
Q.
Is the diagnosis code set?
Diagnose the e-Call control unit troubleshooting (Refer to ).
Go to Step 3.
STEP 3. Check the diagnosis mode
Check if the microphone check result "HFM MIC Check" is displayed on the diagnosis mode
of hands free-ECU. (Refer to <Vehicles with 1CD audio>, <Vehicles
with display audio> or <Vehicles with MMCS>.)
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Check of short to power supply, short to earth, and open circuit
in MIC+, MIC- line between hands free-ECU connector and microphone unit connector.
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).
Repair the connector(s) or wiring harness.
STEP 5. Replace the microphone unit temporarily, and check the trouble
symptom.
Q.
Is the check result normal?
Replace the microphone unit.
Go to Step 6.
STEP 6. Replace the hands free-ECU temporarily, and check the trouble
symptom.