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USB BOX CHASSIS ELECTRICAL 54A-439 COMMENTS ON TROUBLE SYMPTOM 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. Q: Is the check result normal? YES : Go to Step 2. NO : Troubleshoot the MMCS. (Refer to .) STEP 2. Check the multivision display operation. Q: Is the check result normal? YES : Go to Step 12. NO : Go to Step 3. STEP 3. Check the USB cable. Q: Is the check result normal? YES : Go to Step 4. NO : Replace or repair the USB cable. STEP 4. Connector check: C-174 USB box Q: Is the check result normal? YES : Go to Step 5. NO : Repair the defective connector. STEP 5. Voltage measurement at C-174 USB box wiring harness-side connector. (2) Voltage between connector terminal No.1 and the body earth OK: System voltage Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. Wire colour code USB Box Communication Circuit MULTIVISION DISPLAY USB BOX USB USB CABLE |