The USB memory
device data cannot be replayed. <Vehicles with MMCS>
caution
Before replacing the USB box, ensure
that the power supply circuit, the earth circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If the sound replay is impossible with the USB/iPod mode, USB cable, USB box,
or multivision display may be defective, or a communication error between the multivision display
and USB box may have occurred.
PROBABLE CAUSES
The multivision display may be defective.
The USB box 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 work normally and the sound is output.
Q.
Is the check result normal?
Go to Step 2.
Troubleshoot the MMCS. (Refer to .)
STEP 2. Check the multivision display operation.
Display the A/V Mode screen, and check that the "USB/iPod" item is displayed.
Q.
Is the check result normal?
Go to Step 12.
Go to Step 3.
STEP 3. Check the USB cable.
Check that the USB cable is connected to the USB box normally. Or check the USB cable
for damage such as bend.
Q.
Is the check result normal?
Go to Step 4.
Replace or repair the USB cable.
STEP 4. Connector check: C-174 USB box connector
Q.
Is the check result normal?
Go to Step 5.
Repair the defective connector.
STEP 5. Voltage measurement at C-174 USB box connector.
(1)Disconnect the connector, and measure at the wiring harness-side connector.
(2)Voltage between connector terminal No.1 and the body earth OK: System voltage
Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check the wiring harness between C-174 USB box connector terminal
No.1 and fusible link 20.
Check the power supply lines (battery power supply) for open circuit and
short circuit.
note
Prior to the wiring harness inspection, check junction block connectors C-209, C-213 and
joint connector C-132, and repair if necessary.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
Repair the wiring harness.
STEP 7. Resistance measurement at C-174 USB box connector.
(1)Disconnect C-60 USB box connector, and measure the resistance available at the
wiring harness side of the connector.
(2)Check the continuity between terminal No.17 and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 9.
Go to Step 8.
STEP 8. Check the wiring harness between C-174 USB box connector terminal
No.17 and body earth.
Check the earth wires for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
)
)
Go to Step 2.
Troubleshoot the MMCS. (Refer to 
.)