LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> IS 350 >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Occupant Classification System (Diagnostics - Introduction) >> Occupant Classification System >> How To Proceed With Troubleshooting >> How To Proceed With Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

How To Proceed With Troubleshooting

HINT: 

*: Use the Techstream.

  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT: Go to next step 

  2. CUSTOMER PROBLEM ANALYSIS 
    1. Confirm problem symptoms. Refer to PROBLEM SYMPTOMS TABLE .

      NEXT: Go to next step 

  3. PASSENGER AIRBAG ON/OFF INDICATOR CHECK 

    NEXT: Go to next step 

  4. DTC FOR CHECK (Present and Past DTC)* 
    1. Check for DTCs. Refer to DTC CHECK / CLEAR .
      RESULT

      Result Proceed to
      DTC output occurs A
      DTC output does not occur B

      B → Go to PROBLEM SYMPTOMS TABLE 

      A: Go to next step 

  5. DTC CHART 

    NEXT: Go to next step 

  6. CIRCUIT INSPECTION* 

    NEXT: Go to next step 

  7. REPAIR 

    NEXT: Go to next step 

  8. CLEAR DTC (Present and Past DTCs)* 
    1. Clear DTCs. Refer to DTC CHECK / CLEAR .

      NEXT: Go to next step 

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

      Result Proceed to
      DTC output does not occur A
      DTC output occurs B

      B → Go to step 5 

      A: Go to next step 

  10. SYMPTOM SIMULATION 
    1. Check the passenger airbag ON/OFF indicator condition. Refer to DIAGNOSIS SYSTEM .
      RESULT

      Result Proceed to
      Passenger airbag ON/OFF indicator operates normally A
      Passenger airbag ON/OFF indicator ("OFF") and SRS warning light come on B

      B → Go to step 5 

      A: Go to next step 

  11. CONFIRMATION TEST 

    NEXT → END