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.