Yes, you will set an airbag fault if you turn on the ignition with the seats removed, but that airbag fault won't stop the car from starting. You will need Durametric or a factory tool to clear that. Yes, that immobilizer module can probably be repaired. If not, it IS possible to take the data from the damaged module and program into another used module. BTDT in mine.
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
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