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Attached is a listing of possible causes for the SRS warning light. You will need to pull the DTC from your car to identify the culprit. Airbag-related DTC are the "B" type code. You will need a more advance/expensive model OBDII reader to retrieve these DTC's. Most auto parts retailers or your Toyota/Lexus dealership will have one of these expensive OBDII reader and will be more than happy to read the DTC for you (hoping that you will buy whatever parts needed to make the repair).