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Home >> Lexus >> 2023 >> LX 600 Base >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belt Warning System (W/ Occupant Classification System) - Diagnostics & Symptom Tests >> SEAT BELT WARNING SYSTEM (w/ Occupant Classification System) >> Driver Side Seat Belt Warning Light does not Operate [12/2021 - ] >> Procedure

Driver Side Seat Belt Warning Light does not Operate [12/2021 - ]: Procedure

  1. CHECK DTC OUTPUT (AIRBAG SYSTEM) 
    1. Clear the DTCs.

      Body Electrical > SRS Airbag > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    GO TO AIRBAG SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2021 - ] 

    Result: 

    See step  2

  2. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > SRS Airbag > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Driver Seat Buckle Switch Status Driver side buckle switch Unknown, Unbuckle, Buckle or Malfunction Unknown: Data is not determined
      Unbuckle: Driver side seat belt unbuckle
      Buckle: Driver side seat belt buckle
      Malfunction: Driver side seat belt buckle circuit malfunction
      -

      Body Electrical > SRS Airbag > Data List 

      Tester Display
      Driver Seat Buckle Switch Status

      Result

      Result Proceed to
      Unbuckle or Buckle is displayed on the GTS according to the driver seat belt condition A
      Unbuckle or Buckle is not displayed correctly on the GTS according to the driver seat belt condition B
      Malfunction is displayed on the GTS C

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - ] 

    Result: 

    REPLACE FRONT SEAT BELT SET LH. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [12/2021 - ]