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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 
    1. GO TO NEXT STEP 
  2. CUSTOMER PROBLEM ANALYSIS CHECK AND PROBLEM SYMPTOM CONFIRMATION 
    1. GO TO NEXT STEP 
  3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
    1. Check there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with LEXUS hand-held tester.
      1. (ECU unconnected, communication line abnormal) Without code outputs, proceed to "A".
      2. (ECU unconnected, communication line abnormal) With code outputs, proceed to "B".
    1. A: Go to next step 
    2. B: GO TO MULTIPLEX COMMUNICATION SYSTEM (See  DIAGNOSTICS TROUBLE CODE CHART  ) 
  4. ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING 
    1. GO TO NEXT STEP 
  5. ADJUSTMENT, REPAIR OR REPLACE 
    1. GO TO NEXT STEP 
  6. CONFIRMATION TEST 
    1. GO TO NEXT STEP 
    2. END 
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