2003 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Power Window Control System How To Proceed With Troubleshooting

  1. VEHICLE BROUGHT TO WORKSHOP 
    1. GO TO NEXT STEP 
  2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See  CUSTOMER PROBLEM ANALYSIS CHECK  ) 
    1. GO TO NEXT STEP 
  3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
    1. Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with the hand-held tester.
      1. (ECU unconnected, communication line abnormal) Without code output, proceed to A.
      2. (ECU unconnected, communication line abnormal) With code output, proceed to B.
    1. B: Go to MULTIPLEX COMMUNICATION SYSTEM (See  MULTIPLEX COMMUNICATION SYSTEM  ) 
    2. A: GO TO NEXT STEP 
  4. DIAGNOSTIC TROUBLE CODE CHECK (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
    1. Check a DTC and note it if a code is output.
    2. Delete the DTC.
    3. Check if the DTC will be output once again, when the problem symptom is simulated based on the noted code.
      1. Without an output of the code, proceed to A.
      2. With an output of the code, proceed to B.
    1. B: Go to step   7 
    2. A: GO TO NEXT STEP 
  5. PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    1. Without an applicable symptoms table, proceed to A.
    2. With an applicable symptoms table, proceed to B.
    1. B: Go to step   7 
    2. A: GO TO NEXT STEP 
  6. ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING 
    1. PRE-CHECK (See pre-check )
    2. TERMINALS OF ECU (See TERMINALS OF ECU )
    1. GO TO NEXT STEP 
  7. ADJUST, REPAIR OR REPLACE 
    1. GO TO NEXT STEP 
    2. END 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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