Inspection Procedure 2: During the conversation with the hands-free system, the speaker's voice cannot be heard by the other party: Diagnosis

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check the cellular phone. 

   Check that the cellular phone can be used normally as a unit.

   Q: Is it possible to use the cellular phone normally? 

   YES:  Go to Step 2.

   NO:  Repair or replace the cellular phone.

2. STEP 2. Check hands-free module connector C-121 and microphone unit connector D-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are hands-free module connector C-121 and microphone unit connector D-01 in good condition? 

   YES:  Go to Step 3.

   NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

3. STEP 3. Check the wiring harness between hands-free module connector C-121 and microphone unit connector D-01. 
   1. Disconnect hands-free module connector C-121 and microphone unit connector D-01, and check the wiring harness.
      NOTE: Also check intermediate connector C-36 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-36 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
   2. Check the wiring harness between hands-free module connector C-121 (terminal No.1) and microphone unit connector D-01 (terminal No.22)
   3. Check the wiring harness between hands-free module connector C-121 (terminal No.1) and microphone unit connector D-01 (terminal No.23)
   4. Check the wiring harness between hands-free module connector C-121 (terminal No.2) and microphone unit connector D-01 (terminal No.24)

   Q: Is the wiring harness between hands-free module connector C-121 and microphone unit connector D-01 in good condition? 

   YES:  Go to Step 4.

   NO:  The wiring harness may be damaged or the connector (s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

4. STEP 4. Temporarily replace the microphone unit, and check the trouble symptom. 

   Check that the normal conversation is possible with the hands free system.

   Q: Is the normal conversation possible with the hands-free system? 

   YES:  Replace the microphone unit.

   NO:  Replace the hands-free module.