Inspection Procedure 4: When the speech switch is pressed, the voice guide is not output. <Vehicles with MMCS>

caution

Before replacing the hands free-ECU or multivision display, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM

If the voice guide is not sent when the steering wheel remote control switch (speech switch) is pushed, the communication between the multivision display and the hands free-ECU, or the communication between the multivision display and the steering wheel remote control switch, the hands free-ECU or the steering wheel remote control switch may have a problem.

PROBABLE CAUSES

The multivision display may be defective.
The hands free-ECU may be defective.
The steering wheel remote control switch may be defective.
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis mode

Check if the hands free-ECU can be switched to the diagnosis mode. (Refer to

Q. Is the check result normal?

	Go to Step 2

	Perform Inspection Procedure 5 "DIAGNOSIS MODE cannot be made an entry." (Refer to .)

STEP 2. Operation check of the steering wheel remote control switch (audio remote control switch)

Check that the multivision display can be operated by the steering wheel remote control switch.

Q. Is the check result normal?

	Go to Step 3

	Troubleshoot the steering wheel remote control switch.

STEP 3. Check the steering wheel remote control switch (speech switch).

Check the continuity of the steering wheel remote control switch. (Refer to

Q. Is the check result normal?

	Go to Step 4

	Replace the steering wheel remote control switch.

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

Q. Is the check result normal?

	Replace the hands free-ECU.

	Replace the multivision display.