2009 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

HINT: 

*: Use Techstream.

  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT: Go to next step 

  2. CUSTOMER PROBLEM ANALYSIS 

    NEXT: Go to next step 

  3. PASSENGER AIRBAG ON/OFF INDICATOR CHECK 

    NEXT: Go to next step 

  4. DTCs CHECK (Present and Past DTCs)* 
    1. Check for DTCs.

      Result

      Result Proceed to
      DTC is output. A
      DTC is not output. B

      B → GO TO PROBLEM SYMPTOMS TABLE  OCCUPANT CLASSIFICATION SYSTEM (TO 12/2010)  OCCUPANT CLASSIFICATION SYSTEM (FROM 12/2010)  

      A: Go to next step 

  5. DTCs CHART 

    NEXT: Go to next step 

  6. CIRCUIT INSPECTION* 

    NEXT: Go to next step 

  7. REPAIR 

    NEXT: Go to next step 

  8. CLEAR DTCs (Present and Past DTCs)* 
    1. Clear for DTCs.

      NEXT: Go to next step 

  9. DTCs CHECK (Present and Past DTCs)* 
    1. Check for DTCs.

      Result

      Result Proceed to
      DTC is not output. A
      DTC is output. B

      B → Go to   5 step 5 

      A: Go to next step 

  10. SYMPTOM SIMULATION 
    1. Check the passenger airbag ON/OFF indicator condition.

      Result

      Result Proceed to
      Passenger airbag ON/OFF indicator is operate normally. A
      Passenger airbag ON/OFF indicator ("OFF") and SRS warning light comes on. B

      B → Go to   5 step 5 

      A: Go to next step 

  11. CONFIRMATION TEST 

    NEXT → 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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