Inspection Procedure 3

INSPECTION PROCEDURE 3: When the hands-free cellular phone system is activated, the audio system is not set to mute. "PHONE (phone)" is not shown on the display.

CAUTION:
Before replacing the module, ensure that the power supply circuit and the ground circuit are normal.










CIRCUIT OPERATION

If the radio and CD player or the radio, CD player and CD changer receives the signal for MUTE activation from the hands free module, the output from all the speakers other than the front door speaker (RH) or tweeter (RH) is set to 0 in any case.

TECHNICAL DESCRIPTION (COMMENT)

If the audio system is not set to mute while the hands-free cellular phone system is activated, the radio and CD player, radio, CD player and CD changer, or the hands-free module may be faulty.

TROUBLESHOOTING HINTS

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- Malfunctions of radio and CD player or radio, CD player and CD changer
- Malfunction of hands free module

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the audio system.

Check that the audio system is activated normally, the voice is output from each speaker, and each of the audio information is shown on the display.

Q. Is the check result normal?

YES Go to Step 2.
NO Refer to G54A - radio with CD player Diagnosis Symptom Chart.
STEP 2. Check hands free module C-35 and radio and CD player C-118 or radio, CD player and CD changer C-119 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Are hands free module C-35 and radio and CD player C-118 or radio, CD player and CD changer C-119 in good condition?

YES Go to Step 3.

NO Repair or replace the damaged component(s). Harness Connector Inspection.

STEP 3. Check the wiring harness between radio and CD player C-118 (terminal 29) or radio, CD player and CD changer C-119 (terminal 40) and hands free module connector C-35 (terminal 14).





- Check the wiring harness for open circuit and short circuit.

Q. Is the wiring harness between radio and CD player C-118 (terminal 29) or radio, CD player and CD changer C-119 (terminal 40) and hands free module connector C-35 (terminal 14) 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.

STEP 4. Temporarily replace the hands free module, and check the trouble symptom.

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

Q. Is the normal conversation possible with the hands free cellular phone system?

YES Replace the hands free module.
NO Replace the radio and CD player or radio, CD player and CD changer.