Inspection Procedure 5: DIAGNOSIS MODE cannot be made an entry. Mobile Phone item is not displayed on the MENU screen of audio. <Vehicles with radio and CD player>



caution Before replacing the hands free-ECU or radio and CD player, 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 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.
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check the radio and CD player operation.


Check if the radio and CD player 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 .)

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 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.