Inspection Procedure 5: DIAGNOSIS MODE cannot be made an entry. Mobile Phone item is not displayed on the screen of audio/MMCS.

caution

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

COMMENTS ON TROUBLE SYMPTOM

If the diagnosis mode cannot be made an entry, the hands free-ECU, the communication between the hands free-ECU and the radio and CD player or multivision display, or the power supply system of hands free-ECU may have a problem.

PROBABLE CAUSES

The hands free-ECU may be defective.
The radio and CD player may be defective. <Vehicle with radio and CD player>
The multivision display may be defective. <Vehicle with MMCS>
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the radio and CD player or multivision display operation.

Check if the radio and CD player or multivision display work normally and the sound is output.

Q. Is the check result normal?

Go to Step 2.

Troubleshoot the radio and CD player (Refer to

) or MMCS (Refer to

STEP 2. Check of short to power supply, short to earth, and open circuit in IE+, IE- line between hands free-ECU connector and radio and CD player or multivision display connector.

Q. Is the check result normal?

Go to Step 3.

Repair the connector(s) or wiring harness.

STEP 3. Check if the power supply circuit of hands free-ECU have a problem.

Perform the Inspection procedure 1: Check the hands free-ECU power supply circuit of the troubleshooting (Refer to

Q. Is the check result normal?

Go to Step 4.

Repair according to the troubleshooting for reference.

STEP 4. Replace the hands free-ECU temporarily, and check the trouble symptom.

Q. Is the check result normal?

Replace the hands free-ECU.

Replace the radio and CD player or multivision display.