Inspection Procedure 2: The USB adapter data cannot be replayed. <Vehicles with MMCS>


caution Before replacing the hands free-ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal. Check that the USB memory device or iPod® is also normal.

COMMENTS ON TROUBLE SYMPTOM
If the sound replay is impossible with the USB mode, the USB adapter, USB cable, hands free-ECU, or multivision display may be defective, or a communication error between the multivision display and hands free-ECU may have occurred.
note Before troubleshooting, check that the music file (the customer tried to replay) can be replayed.

PROBABLE CAUSES

  • The multivision display may be defective.
  • The hands free-ECU may be defective.
  • The USB adapter may be defective.
  • The USB cable may be defective.
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display operation.
Check if the multivision display normally and the sound is output.

Q. Is the check result normal?
Go to Step 2
Troubleshoot the multivision display. (Refer to .)

STEP 2. 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 3
Perform Inspection Procedure 5 "DIAGNOSIS MODE cannot be made an entry." (Refer to .)

STEP 3. Check the USB adapter.
Check that the continuity exists between the front side terminals of USB adapter and rear side terminals of USB adapter. (Refer to .)

Q. Is the check result normal?
Go to Step 4
Replace the USB adapter.

STEP 4. Check the USB cable.
Check that the USB cable is connected to the USB adapter or hands free-ECU normally. Or check the USB cable for damage such as bend.

Q. Is the check result normal?
Go to Step 5
Replace or repair the USB cable.

STEP 5. Check of short to power supply, short to earth, and open circuit in AAL+, AAR+ line between hands free-ECU connector and multivision display connector.

Q. Is the check result normal?
Go to Step 6
Repair the connector(s) or wiring harness.

STEP 6. Replace the hands free-ECU temporarily, and check the trouble symptom.
Replace the hands free-ECU temporarily, and check that the sound is output from the speaker.

Q. Is the check result normal?
Replace the hands free-ECU.
Replace the multivision display.